makerbase VESC 75100 problem

[warloo93]

Hello.

I recently bought 2x makerbase 75100 vesc (already fried one, the bms overcurrent kicked in at 40km/h and the mostfets exploded). I am building dual motor escooter, the front motor is from Kugoo M4, and the rear is from Kaboo Wolf Warrior 11. Installed new wires in motors, and ntc. My problem is when i use the M4 motor, set up 100-120 phase A, it has good torque, accelerating without problems. Understandably the motor overheats at this power, but the controller stays cool. When i plug the warrior motor, run the motor wizard, set phase amps to 120, it has no low end torque(0-10kmh), and the controller overheating like crazy. The motor run smooth and quietly without problems. I bought this warrior motor as used, the coils are clean, without burn marks or rust.

Controller box
M4 motor testrun
Warrior motor testrun
The speed is incorrent in videos, i leaved the 14pole pairs and 83mm diameter setting, because when i set the correct outside diameter its measuring much higher values than real.

Where i should look for the problem? In controller, or can be something wrong with the warrior motor?
I tried different firmwares, sensored and sensorless mode, changed the insulator under the mosfets to silicone pads
Thank you.

 

[scianiac]

Well I would guess either that motor is not OK or the controller is detecting bad variables or is not able to run the motor stably. I would compare the detected variables from one motor to the other. They of course won't be the same since they are different motors but they are similar so they shouldn't be wildly off. These would be the variables on the FOC page, resistance, inductance, etc. If they are way off like an order of magnitude then either there is something wrong with the motor, like a short, or for whatever reason the controller is not detecting them correctly. These are very cheap controllers for a reason, they are not exactly high quality.

 

[warloo93]

The FOC values are totaly different, but the wolf motor is way bigger than the m4 motor. Also tested the temp with each motor on same amps. The temperature increases with both motors, but the m4 motor has waay more torque, i barely holded it down.
M4 vs warrior motor

 

[scianiac]

Well based on those numbers the M4 probably has a fair bit lower Kv so would make sense it has more torque at a given phase current. If that explains the entire difference you are seeing I'm not sure.

 

[warloo93]

Yes, the M4 motor has ca half rpms on same voltage i think. If my calculations are correct for same torque on the warrior motor i need 200-250 phase amps. 200phase amps * 0,07(duty cycle on holded down motor) * 55v = 770W.