Thread: Mini-Review Dualsky XM5015TE-xx series
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Old Jan 02, 2013, 02:19 PM
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Antony (France)
Joined Sep 2003
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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:
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

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Last edited by Fourdan; Jan 25, 2013 at 04:18 AM.
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