"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:
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life
KV: 390 rpm/V
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 20.7°C 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 28.2°C
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 28.4°C
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 28.2°C
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)