Thread: Mini-Review Dualsky XM5015TE-xx series
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Old Oct 16, 2012, 04:54 AM
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Antony (France)
Joined Sep 2003
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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:
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

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