Thread: Mini-Review Dualsky XM5015TE-xx series
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Old Oct 11, 2012, 10:57 AM
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Antony (France)
Joined Sep 2003
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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:
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

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Last edited by Fourdan; Oct 13, 2012 at 05:02 PM.
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