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Old Oct 08, 2012, 04:02 AM
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Antony (France)
Joined Sep 2003
2,991 Posts
Mini-Review
Dualsky XM5015TE-xx series

Hello
Dualsky recently sent to me samples of the new series "TE" to test and review
"TE" series means Twenty Eight magnets.
I am starting by the XM5015TE-5
The motor is enclosed in a black card box with a pretty jacket. Excellent presentation. A label on the box side indicates: serial number 57810, 470 rpm/V, weight 160g, peak power (15s) 788W, setup 5S prop 16x5+ a bar code.

It is a PM-BLDC outrunner 43.4x15 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here:
XM5015TE-5
http://www.dualsky.com/pro_list_for....lid=244&id=677
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life
Specs :
Kv: 470 rpm/V (measured 491 rpm/V)
Weight: 160g
Diameter: 50mm
Length: 36.5mm
Diameter of Shaft: 6mm
Mounting holes pitch: 19/25mm
Slots, Poles: 24, 28
Idle Current(Io) @10V: 1.2A
Resistance(Ri): 40 mohm
Cruising power[8 mins]: 433.17W
Bursts current[15s]: 42.57A
Peak power[15s]: 787.59W
Recommended ESC: XC6018BA
Setup 1 (No. of Cell, Prop.): 5S, up to 16x5
Max. weight of 4-rotor copter: 4.33 kg
Max. weight of 3D models: 1.44 kg
Memo: 4 kg 4-rotor copters, 30E 3D airplanes

My measurements :
Weight 161g (motor) + 15g accessories (prop fixing 7.5g and cross 7.5g)
Shaft 5.98mm (free 33mm rotor side, end threaded M6, on 18mm)
Shaft (length 71.7mm) is axially drilled, at the end, with one M2.5 threaded hole to fix anything
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 36.7mm (including the rotor cylindrical shoulder for centering).
Rotor shaft locking, stator side, is made by one groove + one wafer + one circlip.
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 5 turns delta.

End bell with 5 spokes. No threaded holes on the spokes.
Propeller is to be fixed only on the rotor side (nut + wafers provided).

Internal resistance phase-phase. I use a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 204mV, Blue-red 202mV, Red-black 204mV at 21.6C ambient temperature.
So average Rm is 40.7 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a Phoenix 60A 6S BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 24V for a warm-up and then I change by stair case the voltage from 24V down to 5V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 23.5 V Io 2.10A, 49.4 watt , 11492 rpm, flange temp 29.5C
taking an Rm around 43 milliohm, we find
Kv 491 rpm/V peakeff = 88% located at Ietamax = 34A and Petamax = 798W

b) No load @ 20 V Io 1.89A , 37.9 watt , 9780 rpm, flange temp 30C
Kv 491 rpm/V peakeff = 87.6% located at Ietamax = 29.7A and Petamax = 593W

c) No load @ 16 V Io 1.65A , 26.4watt , 7830 rpm, flange temp 30.3C
Kv 490 rpm/V peakeff = 87.2% located at Ietamax = 24.8A and Petamax = 398W

An average Kv is around 491 rpm/V (voltage range 16V .. 24V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

The XM5015TE-5 is an excellent motor. Excellent design and manufacturing.
Kv 491 rpm/V is slightly higher 4.5% than announced Kv (470)
Good efficiency (~88%) and it runs very smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 16-24V with an appropriate prop function of the voltage.
6S Lipo I recommend prop 12x6
5S Lipo I recommend prop 13x8 ..14x7
I will add soon on Dualsky Calc new version 3.19

Louis
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Old Oct 10, 2012, 03:39 PM
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Antony (France)
Joined Sep 2003
2,991 Posts
Xm5015te-6mr

"TE" series (Dualsky) means Twenty Eight magnets.
I am continuing the review with the XM5015TE-6MR
The motor is enclosed in a black card box with a pretty jacket. Excellent presentation. A label on the box side indicates: serial number 57868, 390 rpm/V, weight 154g, peak power (15s) 780W, setup 6S upto prop 16x5+ a bar code.

It is a PM-BLDC outrunner 43.4x15 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here for the XM5015TE-6:
http://www.dualsky.com/pro_list_for....nid=128&id=678
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life
Specs :
KV: 390 rpm/V
Weight: 160g
Diameter: 50mm
Length: 36.5mm
Diameter of Shaft: 6mm
Mounting holes pitch: 19/25mm
Slots, poles: 24, 28
Idle Current(Io) @10V: 1A
Resistance(Ri): 59 mohm
Cruising power[8 mins]: 428.92W
Bursts current[15s]: 35.13A
Peak power[15s]: 779.85W
Recommended ESC: XC6018BA
Setup 1 (No. of Cell, Prop.): 6S, up to 16x5
Max. weight of 4-rotor copter: 4.29kg
Max. weight of 3D models: 1.43kg
Memo: 4 kg 4-rotor copters, 30E 3D airplanes

My measurements :
Weight 151g (motor) + 4g accessories (prop fixing wafer & 4 screws)
Internal shaft diameter 5.98mm
Shaft is reduced, rotor side at 3.98mm diameter.
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 36.7mm (including the rotor cylindrical shoulder for centering).
Rotor shaft locking (stator side) is made via a groove + wafer + one circlip
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 6 turns delta.

End bell with 5 spokes.
Propeller is to be fixed only on the rotor side.
I got the MR (MultiRotor) version with a specific prop fixing system (short reduced shaft).
Four threaded holes M3 on the rotor central cylinder, on a 12mm circle, plus a small alu wafer, same pattern. The prop has to be drilled with four holes 3mm.
I suppose the XM5015TE-6 is similar except for the long shaft M6 (and so heavier).

Internal resistance phase-phase: I have used a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 296mV, Blue-red 292mV, Red-black 294mV at 20.7C ambient temperature.
So average Rm is 58.8 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a Phoenix 60A 6S BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 25V for a warm-up and then I change by stair case the voltage from 25V down to 5V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 25 V Io 1.62A, 40.5 watt , 10151 rpm, flange temp 28.2C
taking an Rm around 59 milliohm, we find
Kv 406.7 rpm/V peakeff = 87.8% located at Ietamax = 25.6A and Petamax = 642W

b) No load @ 20 V Io 1.43A , 28.7 watt , 8110 rpm, flange temp 28.4C
Kv 406 rpm/V peakeff = 87.2% located at Ietamax = 21.5A and Petamax = 432W

c) No load @ 15 V Io 1.24A , 26.4watt , 6028 rpm, flange temp 28.2C
Kv 405 rpm/V peakeff = 86.2% located at Ietamax = 17.3A and Petamax = 259W

An average Kv is around 406 rpm/V (voltage range 15V .. 25V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

The XM5015TE-6MR is an excellent motor. Excellent design and manufacturing.
Kv 406 rpm/V is slightly higher 4.1% than announced Kv (390)
Good efficiency (~87%) and it runs very smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 15-25V with an appropriate prop function of the voltage.
7S Lipo I recommend prop 11x8
6S Lipo I recommend prop 13x6.5
5S LiPo I recommend prop 13x10
I will add soon on Dualsky Calc new version 3.19
Note that the iron losses W versus rpm is exactly equal that for the XM5015TE-5 (but different Kv)

Louis
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Last edited by Fourdan; Oct 13, 2012 at 05:02 PM.
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Old Oct 11, 2012, 10:57 AM
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Antony (France)
Joined Sep 2003
2,991 Posts
Xm5015te-4

Dualsky "TE" series means Twenty Eight magnets.
The third motor tested is : XM5015TE-4
Allways the black card box with the pretty jacket. Excellent presentation. Label on the box side indicates: serial number 57809, 570 rpm/V, weight 160g, peak power (15s) 766W, setup 4S prop upto 16x5+ a bar code.

It is a PM-BLDC outrunner 43.4x15 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here:
XM5015TE-4
http://www.dualsky.com/pro_list_for....lid=244&id=670
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life
Kv: 570 rpm/V
Weight: 160g
Diameter: 50mm
Length: 36.5mm
Diameter of Shaft: 6mm
Mounting holes pitch: 19/25mm
Slots, poles: 24, 28
Idle Current(Io) @10V: 1.7A
Resistance(Ri): 27.4milliohm
Cruising power[8 mins]: 421.21W
Bursts current[15s]: 51.75A
Peak power[15s]: 765.84W
Recommended ESC: XC6018BA
Setup 1 (No. of Cell, Prop.): 4S, up to 16x5
Setup 2 (No. of Cell, Prop.): 5S, 14x7
Max. weight of 4-rotor copter: 4.21kg
Max. weight of 3D models: 1.40kg
Memo: 4kg 4-rotor copters, 30E 3D airplanes

My measurements :
Weight 162g (motor) + 15g accessories (prop fixing 7.5g and cross 7.5g)
Shaft 5.98mm (free 33mm rotor side, end threaded M6, on 18mm)
Shaft (length 71.7mm) is axially drilled, at the end, with one M2.5 threaded hole to fix anything
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 36.7mm (including the rotor cylindrical shoulder for centering).
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 4 turns delta.

End bell with 5 spokes. No threaded holes on the spokes.
Propeller is to be fixed only on the rotor side (nut + wafers provided).
The XM5015TE-4 came with a wafer+M3 nut for locking the rotor (stator side). Shaft end is drilled M3.
On the contrary the XM5015TE-5 and XM5015TE-6MR were equipped with a circlip + wafer + shaft groove.

Internal resistance phase-phase. I use a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 142mV, Blue-red 140mV, Red-black 141.5mV at 22.2C ambient temperature.
So average Rm is 28 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a Phoenix 60A 6S BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 20V for a warm-up and then I change by stair case the voltage from 20V down to 5V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 20.19 V Io 2.85A, 57.5 watt , 12241 rpm, flange temp 30.8C
taking an Rm around 30 milliohm, we find
Kv 609 rpm/V peakeff = 87.4% located at Ietamax = 43.9A and Petamax = 886W

b) No load @ 15 V Io 2.18A , 32.8 watt , 9105 rpm, flange temp 33C
Kv 608 rpm/V peakeff = 87.2% located at Ietamax = 32.9A and Petamax = 495W

c) No load @ 10 V Io 1.65A , 17.8watt , 6063 rpm, flange temp 32.5C
Kv 606 rpm/V peakeff = 86.0% located at Ietamax = 24.3A and Petamax = 244W

An average Kv is around 608 rpm/V (voltage range 12V .. 20V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

The XM5015TE-4 is an excellent motor. Excellent design and manufacturing.
Kv 608 rpm/V is slightly higher 4.5% than announced Kv (570)
Good efficiency (~88%) and it runs very smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 12-20V with an appropriate prop function of the voltage.
5S Lipo I recommend prop 11x7
4S Lipo I recommend prop 11x10 ..13x8
I will add soon on Dualsky Calc new version 3.19

Louis
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Last edited by Fourdan; Oct 13, 2012 at 05:02 PM.
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Old Oct 13, 2012, 05:14 AM
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Antony (France)
Joined Sep 2003
2,991 Posts
Xm5015te-3

The fourth motor tested is : XM5015TE-3
Allways the black card box with the pretty jacket. Excellent presentation. Label on the box side indicates: serial number 57808, 760 rpm/V, weight 160g, peak power (15s) 693W, setup 3S prop upto 16x5+ a bar code.

It is a PM-BLDC outrunner 43.4x15 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here:
XM5015TE-3
http://www.dualsky.com/pro_list_for....lid=244&id=669
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life

Kv: 760 rpm/V (745 rpm/V carved on the rotor ! measured Kv 806 rpm/V)
Weight: 160g
Diameter: 50mm
Length: 37mm
Diameter of Shaft: 6.0mm
Mounting holes pitch: 19/25mm
Slots, poles: 24, 28
Idle Current(Io) @10V: 2.9A
Resistance(Ri): 19.6 milliohm
Cruising power[8 mins]: 381W
Bursts current[15s]: 62A
Peak power[15s]: 693W
Recommended ESC: XC6018BA
Setup 1 (No. of Cell, Prop.): 3S, up to 16x5
Setup 2 (No. of Cell, Prop.): 4S, 13x7
Max. weight of 4-rotor copter: 3.8kg
Max. weight of 3D models: 1.3kg
Memo: 4kg 4-rotor copters, 30E 3D airplanes

My measurements :
Weight 159 g (motor) + 15 g accessories (prop fixing 7.5g and cross 7.5g)
Shaft 5.98mm (free 33mm rotor side, end threaded M6, on 18mm)
Shaft (length 71.7mm) is axially drilled, at the end, with one M2.5 threaded hole to fix anything
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 36.7mm (including the rotor cylindrical shoulder for centering).
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 3 turns delta.

End bell with 5 spokes. No threaded holes on the spokes.
Propeller is to be fixed only on the rotor side (nut + wafers provided).
The XM5015TE-3 (like the XM5015TE-4) came with a wafer+M3 nut for locking the rotor (stator side). Shaft end is drilled M3.
On the contrary the XM5015TE-5 and XM5015TE-6MR were equipped with a circlip + wafer + shaft groove.

Internal resistance phase-phase. I use a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 102mV, Blue-red 102mV, Red-black 102mV at 23.5C ambient temperature.
So average Rm is 20 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a Phoenix 60A 6S BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 15V for a warm-up and then I change by stair case the voltage from 20V down to 5V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 15.08 V Io 3.89A, 58.7 watt , 12113 rpm, flange temp 31.2C
taking an Rm around 21 milliohm, we find
Kv 808 rpm/V peakeff = 85.7% located at Ietamax = 52.3A and Petamax = 789W

b) No load @ 11.97 V Io 3.22A , 38.5 watt , 9592 rpm, flange temp 33.2C
Kv 806 rpm/V peakeff = 85.3% located at Ietamax = 42.1A and Petamax = 504W

c) No load @ 8 V Io 2.63A , 21 watt , 6383 rpm, flange temp 33C
Kv 803 rpm/V peakeff = 83.8% located at Ietamax = 31.1A and Petamax = 249W

An average Kv is around 806 rpm/V (voltage range 11V .. 15V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

The XM5015TE-3 is an excellent motor. Excellent design and manufacturing.
Kv 806 rpm/V is slightly higher 8% than announced Kv (745)
Good efficiency (~85%) and it runs smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 10-15V with an appropriate prop function of the voltage.
4S Lipo I recommend prop 11x7
3S Lipo I recommend prop 13x8
I will add soon on Dualsky Calc new version 3.19

Louis
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Last edited by Fourdan; Oct 13, 2012 at 05:01 PM.
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Old Oct 16, 2012, 04:54 AM
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Antony (France)
Joined Sep 2003
2,991 Posts
Xm5010te-9

Dualsky "TE" series means Twenty Eight magnets.
The fifth motor I tested is : XM5010TE-9
Allways the black card box with the pretty jacket. Label on the box side indicates: serial number 57807, 390 rpm/V, weight 126g, peak power (15s) 578W, setup 6S prop upto 15x5+ a bar code.

It is a PM-BLDC outrunner 43.4x10 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here:
XM5010TE-9
http://www.dualsky.com/pro_list_for....nid=128&id=676
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life
Kv: 390 rpm/V
Weight: 126g
Diameter: 50mm
Length: 31.6mm
Diameter of Shaft: 6mm
Mounting holes pitch: 19/25mm
Slots, poles: 24, 28
Idle Current(Io) @10V: 0.9A
Resistance(Ri): 96 mohm
Cruising power[8 mins]: 317.91W
Bursts current[15s]: 26.04A
Peak power[15s]: 578.02W
Recommended ESC: XC4018BA
Setup 1 (No. of Cell, Prop.): 6S, 15x5
Max. weight of 4-rotor copter: 3.18 kg
Max. weight of 3D models: 1.06 kg
Memo: 3kg 4-rotor copters, 15 - 25E airplanes

My measurements :
Weight 123.5g (motor) + 15g accessories (prop fixing 7.5g and cross 7.5g)
Shaft 5.98mm (free 33mm rotor side, end threaded M6, on 18mm)
Shaft (length 65mm) is axially drilled, at the end, with one M2.5 threaded hole to fix anything
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 31.7mm (including the rotor cylindrical shoulder for centering).
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 9 turns delta.

End bell with 5 spokes. No threaded holes on the spokes.
Propeller is to be fixed only on the rotor side (nut + wafers provided).
The XM5010TE-9 came with a wafer+M3 nut for locking the rotor (stator side). Shaft end is drilled M3.

Internal resistance phase-phase. I use a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 484mV, Blue-red 480mV, Red-black 482mV at 19.8C ambient temperature.
So average Rm is 0.0965 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a Phoenix 60A 6S BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 26V for a warm-up and then I change by stair case the voltage from 26V down to 5V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 26.17 V Io 1.22A, 31.9 watt , 10542 rpm, flange temp 29.1C
taking an Rm around 100 milliohm, we find
Kv 404.7 rpm/V peakeff = 86.7% located at Ietamax = 17.7A and Petamax = 462W

b) No load @ 16.14 V Io 0.95A , 15.4 watt , 6479 rpm, flange temp 29C
Kv 403.9 rpm/V peakeff = 85.1% located at Ietamax = 12.3A and Petamax = 198W

c) No load @ 10.07 V Io 0.78A , 7.9 watt , 4027 rpm, flange temp 28.3C
Kv 403.3 rpm/V peakeff = 83.0% located at Ietamax = 8.8A and Petamax = 89W

An average Kv is around 404 rpm/V (voltage range 15V .. 26V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

To complete the testings I used a Commander 50V130A ESC (timing auto) around 30V
No load @ 30.14 V Io 1.23A , 37.1 watt , 12059 rpm, flange temp 29C
Kv 401.8 rpm/V peakeff = 87.5% located at Ietamax = 19A and Petamax = 574W

The XM5015TE-9 is an excellent motor. Excellent design and manufacturing.
Kv 404 rpm/V is slightly higher 3.6% than announced Kv (390)
Good efficiency (~86%) and it runs very smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 15-30V with an appropriate prop function of the voltage.
6S Lipo, I recommend prop 11x10 or 13x6.5
5S Lipo, I recommend prop 14x8.5
I will add soon on Dualsky Calc new version 3.19

Louis
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Old Oct 31, 2012, 05:24 AM
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Romania, BV, Brasov
Joined Apr 2010
15 Posts
Very interesting and very good news that such 24N28P motors are finally available on the market. So far I have got a few pieces NX-4008, with 24N22P configuration from hobbyking:
http://hobbyking.com/hobbyking/store...dProduct=17924
They are good motors too. I have rewound them, put on EasyGlider and tested with large propellers (13x11 up to 18.5x15). They perform good. On 13x11 propeller I put up to 250W input power (Kv=1000rpm/V and 2s battery) and get excelent speed and climb rate. On 18.5x15 (and Kv=500, 2s battery) I use no more than 100W average input power (for several minutes of run whitout heating) and still get good climb rate and appropriate cruising speed. The greatest thing I get with this large propeller is efficiency: with a 2s 2.2Ah I can fly up to 1h. Last time I flew with 16x13 Aeronaut CAM propeller with the Kv=500 motor and 2s battery. I get satisfactory climb rate (maybe 3-4m/s) and best battery life.
I don't have devices for dynamic measurements and I have no idea what their efficiency is, but I'm very interested to find more about.
I am happy with these motors from Hobbyking, but I am a bit frustrated that they have only 22 magnets and I don't understand why they are not produced with 28magnets, to perform even better on such large propellers.

Your measurements above reffer only to magnetic loss on no load run. I am wondering about the level of magnetic loss both as a function of speed and load, and of course the overall efficiency as a function of speed and load.
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Last edited by ViorelX; Oct 31, 2012 at 05:42 AM.
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Old Oct 31, 2012, 05:53 AM
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Antony (France)
Joined Sep 2003
2,991 Posts
Quote:
Originally Posted by ViorelX View Post
Very interesting and very good news that such 24N28P motors are finally available on the market. So far I have got a few pieces NX-4008, with 24N22P configuration from hobbyking:
http://hobbyking.com/hobbyking/store...dProduct=17924
They are good motors too. I have rewound them, put on EasyGlider and tested with large propellers (13x11 up to 18.5x15). They perform good. On 13x11 propeller I put up to 250W input power (Kv=1000rpm/V and 2s battery) and get excelent speed and climb rate. On 18.5x15 (and Kv=500, 2s battery) I use no more than 100W average input power (for several minutes of run whitout heating) and still get good climb rate and appropriate cruising speed. The greatest thing I get with this large propeller is efficiency: with a 2s 2.2Ah I can fly up to 1h. Last time I flew with 16x13 Aeronaut CAM propeller with the Kv=500 motor and 2s battery. I get satisfactory climb rate (maybe 3-4m/s) and best battery life.
I don't have devices for dynamic measurements and I have no idea what their efficiency is, but I'm very interested to find more about.
I am happy with these motors from Hobbyking, but I am a bit frustrated that they have only 22 magnets and I don't understand why they are not produced with 28magnets, to perform even better on such large propellers.

Your measurements above reffer only to magnetic loss on no load run. I am wondering about the level of magnetic loss both as a function of speed and load, and of course the overall efficiency as a function of speed and load.
Hi
The iron losses are not depending directly of the load.
Iron losses depend of rpm (not linearly)
Copper losses are Rm Amps^2 (Joule effect)
+ some ESC losses
Louis
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Old Oct 31, 2012, 07:55 AM
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Hi Louis,
You are not right.
Iron loss depends not only on rpm, but also on the flux density. Things are complicated, but a simple formula (Steinmetz) describes this loss as:
W=C * f^a * B^b,
Where f is the frequency of the rotational magnetic field (in the case of 24N28P it is 14x the rotational speed of the rotor), B is the flux density through the iron core and a, b are exponents close to 1 and 2 respectively.

Your tests measure iron loss only on no load run, with very low current and flux density. As the load increases, the flux density increases too, as well as the iron loss.
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Old Oct 31, 2012, 08:28 AM
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Antony (France)
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Hi
I was considering iron losses due to PM (permanent magnets) rotation:
Eddy currents in the stator and hysteresis cycles losses
(it's a second order polynomial vs rpm)
Louis
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Old Oct 31, 2012, 08:39 AM
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And the peak efficiency was estimated only from no load run data. For me this seems to be not accurate. Is the value of 88% not a bit too optimistic?
For example, for the last motor you have measured a static interphase resistance of 96mOhm and for etamax calculation you have considered a Ri of 100mOhm. This cannot be correct.
DriveCalc estimates the efficiency by processing no load and several load run data and it uses a so called dynamic resistance, which can be much greater than the static resistance.
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Old Oct 31, 2012, 09:38 AM
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Quote:
Originally Posted by ViorelX View Post
And the peak efficiency was estimated only from no load run data. For me this seems to be not accurate. Is the value of 88% not a bit too optimistic?
For example, for the last motor you have measured a static interphase resistance of 96mOhm and for etamax calculation you have considered a Ri of 100mOhm. This cannot be correct.
DriveCalc estimates the efficiency by processing no load and several load run data and it uses a so called dynamic resistance, which can be much greater than the static resistance.
Hi
In my mini-reviews (for any motor brand) I use a theoretical Peak-eff with an internal resistance close to static Rm measured at around 20C using a simple formula (ref Bergmeyer) inside an EXCEL sheet.
So it's exact that the Peakeff is slightly optimistic.
In Dualsky Calc (DC) I use sophisticated empirical algorithms to try to take into account
a) Temperature rising of the windings
b) Estimated losses due to the ESC
So Dualsky Calc is giving a lower peakeff or a lower efficiency for the operating point.

If you use a dynamometric bench there are also a lot of big errors due to inaccuracy in measurements
a) Torque inaccuracy
b) Amps inaccuracy
Generally voltage is measured with good accuracy
But total inaccuracies are also important.

Regarding DriveCalc an incertitude is regarding the motor of the user compared to the motor used in the data base (mainly an inaccuracy in Kv)
The same for Dualsky Calc (based on my measurements on my sample, not the motor of the user)

Anyway programs like Dualsky Calc (and cousins) are mainly interesting to get an order of magnitude. A 1% precision is not the goal.
I would be satisfied if I get 5% accuracy.
Louis
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Old Jan 02, 2013, 02:19 PM
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Xm5010te-5

The sixth motor tested is : XM5010TE-5
Allways the black card box with the pretty jacket. Label on the box side indicates: serial number 57805, 700 rpm/V, weight 126g, peak power (15s) 550W, setup 3S , prop 12x5 .. 14x5+ a bar code.

It is a PM-BLDC outrunner 43.4x10 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here:
XM5010TE-5
http://www.dualsky.com/pro_list_for....nid=128&id=673
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life

KV: 700 rpm/V
Weight: 126g
Diameter: 50mm
Length: 31.7mm
Diameter of shaft: 6mm
Mounting holes pitch: 19/25mm
Slots, Poles: 24, 28
Idle Current(Io) @10V: 1.9A
Resistance(Ri): 32 mohm
Cruising power[8 mins]: 280.95W
Bursts current[15s]: 46.02A
Peak power[15s]: 510.81W
Recommended ESC: XC4018BA
Setup 1 (No. of Cell, Prop.): 3S, 16x5
Setup 2 (No. of Cell, Prop.): 4S, 14x5
Max. weight of 4-rotor copter: 2.81kg
Max. weight of 3D models: 0.94kg
Memo: 3kg 4-rotor copters, 15 - 25E airplanes

My measurements :
Weight 125g (motor) + 15g accessories (prop fixing 7.5g and cross 7.5g)
Shaft 5.98mm (free 33mm rotor side, end threaded M6, on 18mm)
Shaft (length 65mm) is axially drilled, at the end, with one M2.5 threaded hole to fix anything
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 31.7mm (including the rotor cylindrical shoulder for centering).
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 9 turns delta.

End bell with 5 spokes. No threaded holes on the spokes.
Propeller is to be fixed only on the rotor side (nut + wafers provided).
The XM5010TE-5 came with a wafer+M3 nut for locking the rotor (stator side). Shaft end is drilled M2.5

Internal resistance phase-phase. I use a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 159.5mV, Blue-red 162mV, Red-black 158mV at 19.8C ambient temperature.
So average Rm is 32 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a CC Phoenix 60A BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 14V for a warm-up and then I change by stair case the voltage from 16V down to 5V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 16.10 V Io 2.25A, 36.2 watt , 11675 rpm, flange temp 25.9C
taking an Rm around 32 milliohm, we find
Kv 728.5 rpm/V peakeff = 86.8% located at Ietamax = 33A and Petamax = 531W

b) No load @ 13.07 V Io 1.92A , 25 watt , 9468 rpm, flange temp 26.8C
Kv 728 rpm/V peakeff = 86.5% located at Ietamax = 27.4A and Petamax = 358W

c) No load @ 8.02 V Io 1.50A , 12 watt , 5787 rpm, flange temp 26.6C
Kv 726 rpm/V peakeff = 84.8% located at Ietamax = 19A and Petamax = 152W

An average Kv is around 728 rpm/V (voltage range 10V .. 16V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

The XM5015TE-5 is an excellent motor. Excellent design and manufacturing.
Kv 728 rpm/V is a little higher 4% than announced Kv (700)
Good efficiency (~86%) and it runs very smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 10-14V with an appropriate prop function of the voltage.
4S Lipo I recommend prop 11x5.5E or 10x8E
3S Lipo I recommend prop 12x10E
I will add soon on Dualsky Calc new version 3.19

Louis
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Old Jan 25, 2013, 08:36 AM
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Antony (France)
Joined Sep 2003
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Dualsky "TE" series (Twenty Eight magnets)

The seventh motor (of this TE series) I have tested is named XM5010TE-4
Allways the black card box with the pretty jacket. Label on the box side indicates: serial number 57804, 870 rpm/V, weight 126g, peak power (15s) 550W, setup up to 3S : prop 12x5 14x5+ a bar code.

It is a PM-BLDC outrunner 43.4x10 mm stator, with 24 slots and 28 mag poles. Laminations are 0.2mm thick.
Dualsky infos are available here:
XM5010TE-4
http://www.dualsky.com/pro_list_for....nid=128&id=673
Features :
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life

Kv: 870 rpm/V
Weight: 126g
Diameter: 50mm
Length: 32mm
Diameter of Shaft: 6.0mm
Mounting holes pitch: 19/25mm
Slots, poles: 24,28
Idle Current(Io) @10V: 2.4A
Resistance(Ri): 22mOhm
Cruising power[8 mins]: 330W
Bursts current[15s]: 54A
Peak power[15s]: 600W
Recommended ESC: XC6018BA
Setup 1 (No. of Cell, Prop.): 3S, 14x6
Setup 2 (No. of Cell, Prop.): 4S, 12x6
Max. weight of 4-rotor copter: 3.3 kg
Max. weight of 3D models: 1.1 kg
Memo: 3kg 4-rotor copters, 15-25E airplanes

My measurements :
Weight 124.5g (motor) + 15g accessories (prop fixing 7.5g and cross 7.5g)
Shaft 5.98mm (free 33mm rotor side, end threaded M6, on 18mm)
Shaft (length 65mm) is axially drilled, at the end, with one M2.5 threaded hole to fix anything
Stator fixing is standard via 4 M3 (on circle 25mm) , Allen key 2mm.
Outer diameter (rotor flux ring) 49 mm
Body length 31.7mm (including the rotor cylindrical shoulder for centering).
Connectors gold slotted 3.5mm male, cables length around 80mm.
Double dLRK windings maybe 9 turns delta.

End bell with 5 spokes. No threaded holes on the spokes.
Propeller is to be fixed only on the rotor side (nut + wafers provided).
The XM5010TE-4 came with a wafer+M3 nut for locking the rotor (stator side). Shaft end is drilled M2.5

Internal resistance phase-phase. I use a CC 5A power supply and a DMM with good gold 3.5mm Y harness.
Black-blue 112mV, Blue-red 111mV, Red-black 111mV at 19.8C ambient temperature.
So average Rm is 22.3 milliohm, windings balance is very good.

Second test is no load on my bench with my Medusa PowerPro device and the WindowsXP ProView software.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is a DualskyXC8018A v2 6S BEC, timing "low", 8 kHz. Servo tester is a Leton.
My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
I ran the motor no load WOT 2 minutes at 14V for a warm-up and then I change by stair case the voltage from 14V down to 10V. Each voltage step is maintained around 30 seconds.
Then I save and export the no load results to EXCEL for analysis :

a) No load @ 14.01 V Io 2.78A, 39 watt , 12826 rpm, flange temp 26.9C
taking an Rm around 23.4 milliohm, we find
Kv 919.6 rpm/V peakeff = 86.9% located at Ietamax = 40.9A and Petamax = 573W

b) No load @ 11.93 V Io 2.51A , 30 watt , 10901 rpm, flange temp 27.2C
Kv 918.3 rpm/V peakeff = 86.5% located at Ietamax = 35.8A and Petamax = 427W

c) No load @ 10.51 V Io 2.34A , 24.6 watt , 9584 rpm, flange temp 27.1C
Kv 917.1 rpm/V peakeff = 86.1% located at Ietamax = 32.4A and Petamax = 341W

An average Kv is around 919 rpm/V (voltage range 15V .. 26V) that is +5.6% upper announced Kv
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.

The XM5015TE-4 is an excellent motor. Excellent design and manufacturing.
Kv 919 rpm/V is a little higher 5.6% than announced Kv (870)
Good efficiency (~86%) and it runs very smoothly. Good dynamic balancing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.
Bearings are embedded in two alu stator carriers assembled by small bolts, clamping the 24 slots laminations

This motor is very good to be used in the range 8-15V with an appropriate prop function of the voltage.
4S Lipo I recommend prop 11x10 or 13x6.5
3S Lipo I recommend prop 14x8.5
2S LiPo
I will add soon on Dualsky Calc new version 3.19

Louis
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Old Jan 27, 2013, 10:59 AM
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Joined Sep 2003
2,991 Posts
Dualsky "TE" series means Twenty Eight magnets.
I have tested the XM4005TE family :
PM-BLDC outrunners 34.5x5 mm stator, with 24 slots and 28 mag poles. Laminations are 0.35mm thick
weight is around 52g.
Dualsky overview table is available here:
http://www.dualsky.com/downloads/Xmo...sheet_V1_1.pdf
They are high torque, high efficiency, specifically designed for Multi Rotor systems.
My general measurements and observations:
No stator traditional flange, just an alu stator tube diameter 24mm, drilled with eight 4mm holes,
plus four tappered M3 on 16mm and 19mm for fixing on the black cross provided.
Two ball bearings labeled 694Z that corresponds to metric BB : 4-11-4 mm
End bell with 5 spokes. Two tappered M3 holes / 12mm space. Black color.
Propeller to be fixed only on the rotor side (adapter with a set screw provided, prop hole 6mm, conical nut M6 hex 11.2mm).
Shaft 3.98mm inside, reduced to 3.17 mm rotor side, free 12mm, with a flat.
Shaft overall length = 34 mm
Outer diameter (rotor flux ring) 39.7 mm
Body length 21.1mm
Connectors gold slotted 3.5mm male, cables length around 80mm.
Always the black card box with the pretty blue jacket.
All testings are conducted WOT no load on my bench with a Medusa PowerPro device and the WindowsXP ProView software. Recordings in .PAR file exported to EXCEL file for analysis.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is my CC Phoenix 60A 6S BEC, timing "low", 8 kHz, able to go down to 4V in.
Servo tester is a Leton. My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
For internal resistance phase-phase measurement I use a constant current 2A or 4A and a DMM with good gold 3.5mm Y harness.
Black-blue, Blue-red, Red-black voltages are measured at around 20C ambient temperature, and averaged to give an average Rm.
The XM4005TE family corresponds to an excellent and original design + manufacturing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.

#1 XM4005TE-11
Label on the box side indicates: serial number 57797, 840 rpm/V, weight 53g, peak power (15s) 187W, setup up 3S : prop 8x5 10x5+ a bar code.
Weight 51g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 133 milliohm

a) No load @ 14.99 V Io 1.14A, 17.1 watt , 12677 rpm, flange temp 27.9C
taking Rm around 139 milliohm, we find :
Kv 854.8 rpm/V peakeff = 80.4% located at Ietamax = 11A and Petamax = 165W
b) No load @ 11.91 V Io 0.98A , 11.6 watt , 10080 rpm, flange temp 27.2C
Kv 856.5 rpm/V peakeff = 79.7% located at Ietamax = 9.1A and Petamax = 109W
c) No load @ 10.01 V Io 0.87A , 8.7 watt , 8473 rpm, flange temp 26.4C
Kv 856.8 rpm/V peakeff = 79.2% located at Ietamax = 7.9A and Petamax = 79W

An average Kv is around 856 rpm/V (voltage range 10V .. 15V) that is +1.9% over announced Kv 840
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 9-16V with an appropriate prop function of the voltage.
I recommend (in case of planes)
4S Lipo : prop 8.5x6E Gunther 1712 8x3.8SF
3S Lipo : prop 10x5E 9x6SF

#2 XM4005TE-13
Label on the box side indicates: serial number 57798, 690 rpm/V, weight 53g, peak power (15s) 206W, setup 3S : upto 12x5 + a bar code.
Weight 51g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 182 milliohm

a) No load @ 18.06 V Io 1.07A, 19.3 watt , 13200 rpm, flange temp 28.6C
taking Rm around 192 milliohm, we find :
Kv 739.5 rpm/V peakeff = 79.8% located at Ietamax = 10.0A and Petamax = 181W
b) No load @ 14.99 V Io 0.91A , 13.6 watt , 10970 rpm, flange temp 27.8C
Kv 740.4 rpm/V peakeff = 79.6% located at Ietamax = 8.4A and Petamax = 126W
c) No load @ 12.06 V Io 0.80A , 7.1 watt , 8833 rpm, flange temp 26.7C
Kv 741.9 rpm/V peakeff = 78.8% located at Ietamax = 7.1A and Petamax = 86W

An average Kv is around 740 rpm/V (voltage range 11V .. 19V) that is +7.2% upper announced Kv 690
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 10-19V with an appropriate prop function of the voltage.
I recommend (in case of planes)
5S Lipo : prop 8x4E
4S Lipo : prop 9x4.7SF 8.5x7E
3S Lipo : prop 11x5.5E 9x9E

#3 XM4005TE-16
Label on the box side indicates: serial number 57799, 570 rpm/V, weight 53g, peak power (15s) 176W, setup 4S : 10x5 .. 11x5 + a bar code.
Weight 51.5g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 237 milliohm

a) No load @ 21.01 V Io 0.81A, 17.1 watt , 12299 rpm, flange temp 28.4C
taking Rm around 250 milliohm, we find :
Kv 591.1 rpm/V peakeff = 81.3% located at Ietamax = 8.3A and Petamax = 174W
b) No load @ 18.03 V Io 0.72A , 13 watt , 10569 rpm, flange temp 27.6C
Kv 592.1 rpm/V peakeff = 81.0% located at Ietamax = 7.2A and Petamax = 130W
c) No load @ 14.06 V Io 0.63A , 8.9 watt , 8249 rpm, flange temp 26.6C
Kv 593.3 rpm/V peakeff = 80.0% located at Ietamax = 6A and Petamax = 84W

An average Kv is around 592 rpm/V (voltage range 14V .. 21V) that is +3.9% upper announced Kv 570
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 12-22V with an appropriate prop function of the voltage.
I recommend (in case of planes)
6S Lipo : prop 8x4E
5S Lipo : prop 9x4.5E 9x3.8SF
4S Lipo : prop 11x3.8E or 9x9E
3S Lipo : prop 11x10E

#4 XM4005TE-29
Label on the box side indicates: serial number 57800, 320 rpm/V, weight 53g, peak power (15s) 150W, setup 6S : 10x5 .. 12x5 + a bar code.
Weight 51g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 786 milliohm
a) No load @ 25.25 V Io 0.44A, 11 watt , 8059 rpm, flange temp 25.1C
taking Rm around 812 milliohm, we find :
Kv 323.7 rpm/V peakeff = 77.7% located at Ietamax = 3.7A and Petamax = 93W
b) No load @ 19.97 V Io 0.38A , 7.6 watt , 6375 rpm, flange temp 24.8C
Kv 324.2 rpm/V peakeff = 76.7% located at Ietamax = 3.1A and Petamax = 61W
c) No load @ 15.03 V Io 0.34A , 5.1 watt , 4797 rpm, flange temp 24.1C
Kv 325.1 rpm/V peakeff = 74.8% located at Ietamax = 2.5A and Petamax = 38W

An average Kv is around 324 rpm/V (voltage range 15V .. 25V) that is +1.25% upper announced Kv 320
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 15-28V with an appropriate prop function of the voltage.
I recommend (in case of planes)
8S Lipo : prop 10x5E
7S Lipo : prop 10x7E
6S Lipo : prop 11x8.5E
5S Lipo : prop 12x10E

Embedded in Dualsky Calc new version 3.20 (27 jan 2013)

Louis
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Old Jan 27, 2013, 11:19 AM
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Antony (France)
Joined Sep 2003
2,991 Posts
Dualsky "TE" series means Twenty Eight magnets.
I have also tested the XM4010TE family :
PM-BLDC outrunners 34.5x10 mm stator, with 24 slots and 28 mag poles. Laminations are 0.35mm thick
weight is around 79g.
Dualsky overview table is available here:
http://www.dualsky.com/downloads/Xmo...sheet_V1_1.pdf
They are high torque, high efficiency, specifically designed for Multi Rotor systems.
My general measurements and observations:
No stator traditional flange, just an alu stator tube diameter 24mm, drilled with eight 4mm holes,
plus four tappered M3 on 16mm and 19mm for fixing on the black cross provided.
Two ball bearings labeled 694Z that corresponds to metric BB : 4-11-4 mm
End bell with 5 spokes. Two tappered M3 holes / 12mm space. Black color.
Propeller to be fixed only on the rotor side (adapter with a set screw provided, prop hole 6mm, conical nut M6 hex 11.2mm).
Shaft 3.98mm inside, reduced to 3.17 mm rotor side, free 12mm, with a flat.
Shaft overall length = 38.9mm
Outer diameter (rotor flux ring) 39.7 mm
Body length 25.1mm
Connectors gold slotted 3.5mm male, cables length around 80mm.
Always the black card box with the pretty blue jacket.
All testings are conducted WOT no load on my bench with a Medusa PowerPro device and the WindowsXP ProView software. Recordings in .PAR file exported to EXCEL file for analysis.
The number of poles is set to 14 (28 is not possible), so I have to correct the rpm values (/2) .
ESC used is my CC Phoenix 60A 6S BEC, timing "low", 8 kHz, able to go down to 4V in.
Servo tester is a Leton. My power supply is a MASTECH HY3005D-2 (Linear CCCV 30V 10A max).
For internal resistance phase-phase measurement I use a constant current 2A or 4A and a DMM with good gold 3.5mm Y harness.
Black-blue, Blue-red, Red-black voltages are measured at around 20C ambient temperature, and averaged to give an average Rm.
The XM4010TE family corresponds to an excellent and original design + manufacturing.
The design of the stator is not common. Very "airy" and good for air passing through. No bulky stator flange.
It could be very easy to rewind.

#1 XM4010TE-5
Label on the box side indicates: serial number 57801, 880 rpm/V, weight 78g, peak power (15s) 353W, setup up 3S : prop 9x5 11x5+ a bar code.
Weight 79.5g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 45.14 milliohm

a) No load @ 12.44 V Io 2.18A, 27.2 watt , 11165 rpm, flange temp 37C
taking Rm around 50 milliohm, we find :
Kv 905.3 rpm/V peakeff = 82.1% located at Ietamax = 23.2A and Petamax = 289W
b) No load @ 10.19 V Io 1.89A , 19.2 watt , 9132 rpm, flange temp 37C
Kv 904.7 rpm/V peakeff = 81.6% located at Ietamax = 19.6A and Petamax = 199W
c) No load @ 8.03 V Io 1.63A , 13.1 watt , 7191 rpm, flange temp 35.7C
Kv 904.4 rpm/V peakeff = 80.9% located at Ietamax = 16.2A and Petamax = 130W

An average Kv is around 905 rpm/V (voltage range 8V .. 13V) that is +2.8% upper announced Kv 880
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 8-14V with an appropriate prop function of the voltage.
I recommend (in case of planes)
4S Lipo : prop 8x6E or 9x4.5E
3S Lipo : prop 10x7E
2S LiPo : prop 14x7E

#2 XM4010TE-6
Label on the box side indicates: serial number 57802, 720 rpm/V, weight 78g, peak power (15s) 377W, setup 3S : upto 13x6 + a bar code.
Weight 78.5g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 68.6 milliohm

a) No load @ 15.0 V Io 1.75A, 26.2 watt , 11372 rpm, flange temp 36.3C
taking Rm around 76 milliohm, we find :
Kv 764.9 rpm/V peakeff = 82.1% located at Ietamax = 18.6A and Petamax = 278W
b) No load @ 12.09 V Io 1.49A , 18 watt , 9158 rpm, flange temp 35.8C
Kv 764.6 rpm/V peakeff = 81.6% located at Ietamax = 15.4A and Petamax = 186W
c) No load @ 10.06 V Io 1.32A , 13.3 watt , 7605 rpm, flange temp 34.9C
Kv 763.9 rpm/V peakeff = 81.1% located at Ietamax = 13.3A and Petamax = 133W

An average Kv is around 764 rpm/V (voltage range 10V .. 15V) that is +6.1% upper announced Kv 720
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 10-16V with an appropriate prop function of the voltage.
I recommend (in case of planes)
4S Lipo : prop 10x5E or 9x6SF
3S Lipo : prop 11x8E
2S LiPo : prop 14x8.5E

#3 XM4010TE-7
Label on the box side indicates: serial number 57803, 620 rpm/V, weight 78g, peak power (15s) 338W, setup 4S : 12x5 + a bar code.
Weight 78g (motor) + 7.5g accessories (prop adapter 3g and cross 4.5g)
Rm = 85.6 milliohm

a) No load @ 17.07 V Io 1.55A, 26.5 watt , 11007 rpm, flange temp 35.7C
taking Rm around 95 milliohm, we find :
Kv 650.3 rpm/V peakeff = 82.3% located at Ietamax = 16.7A and Petamax = 285W
b) No load @ 13.96 V Io 1.36A , 19 watt , 9002 rpm, flange temp 35.0C
Kv 650.7 rpm/V peakeff = 81.7% located at Ietamax = 14.2A and Petamax = 198W
c) No load @ 11.07 V Io 1.18A , 13.1 watt , 7128 rpm, flange temp 33.3C
Kv 650.4 rpm/V peakeff = 81.0% located at Ietamax = 11.8A and Petamax = 131W

An average Kv is around 650 rpm/V (voltage range 11V .. 18V) that is +4.8% upper announced Kv 620
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
This motor is very good to be used in the range 10-16V with an appropriate prop function of the voltage.
I recommend (in case of planes)
5S Lipo : prop 8x8E
4S Lipo : prop 11x3.8E or 9x9E
3S Lipo : prop 12x10E

Embedded in Dualsky Calc new version 3.20 (27 jan 2013)

Louis
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