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

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:
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

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Last edited by Fourdan; Oct 13, 2012 at 04:56 PM.
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