The fourth motor tested is : XM5015TE-3
Allways the black card box with the pretty jacket. Excellent presentation. Label on the box side indicates: serial number 57808, 760 rpm/V, weight 160g, peak power (15s) 693W, setup 3S 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:
** High torque
** High efficiency
** Specifically designed for Multi Rotor
** Low profile
** Dynamic balancing
** 3 times life
Kv: 760 rpm/V (745 rpm/V carved on the rotor ! measured Kv 806 rpm/V)
Diameter of Shaft: 6.0mm
Mounting holes pitch: 19/25mm
Slots, poles: 24, 28
Idle Current(Io) @10V: 2.9A
Resistance(Ri): 19.6 milliohm
Cruising power[8 mins]: 381W
Bursts current[15s]: 62A
Peak power[15s]: 693W
Recommended ESC: XC6018BA
Setup 1 (No. of Cell, Prop.): 3S, up to 16x5
Setup 2 (No. of Cell, Prop.): 4S, 13x7
Max. weight of 4-rotor copter: 3.8kg
Max. weight of 3D models: 1.3kg
Memo: 4kg 4-rotor copters, 30E 3D airplanes
My measurements :
Weight 159 g (motor) + 15 g 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 3 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-3 (like 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 102mV, Blue-red 102mV, Red-black 102mV at 23.5°C ambient temperature.
So average Rm is 20 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 15V 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 @ 15.08 V Io 3.89A, 58.7 watt , 12113 rpm, flange temp 31.2°C
taking an Rm around 21 milliohm, we find
Kv 808 rpm/V peakeff = 85.7% located at Ietamax = 52.3A and Petamax = 789W
b) No load @ 11.97 V Io 3.22A , 38.5 watt , 9592 rpm, flange temp 33.2°C
Kv 806 rpm/V peakeff = 85.3% located at Ietamax = 42.1A and Petamax = 504W
c) No load @ 8 V Io 2.63A , 21 watt , 6383 rpm, flange temp 33°C
Kv 803 rpm/V peakeff = 83.8% located at Ietamax = 31.1A and Petamax = 249W
An average Kv is around 806 rpm/V (voltage range 11V .. 15V)
From these testings I deduce one important curve : iron losses ( no load VxIo ) versus rpm.
The XM5015TE-3 is an excellent motor. Excellent design and manufacturing.
Kv 806 rpm/V is slightly higher 8% than announced Kv (745)
Good efficiency (~85%) and it runs 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 10-15V with an appropriate prop function of the voltage.
4S Lipo I recommend prop 11x7
3S Lipo I recommend prop 13x8
I will add soon on Dualsky Calc new version 3.19