Query: Will the Flipsky 75200 be able to run my 70 pole PMSM?

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Hey all
I hope everyone is doing well

We have a 72V 6kW 70-pole PMSM. We recently purchased a sine-wave motor controller from Golden Motors (EZkontrol motor controller model: EZ-B144400) and it was not able to run the motor. It finished the “self-learning” and even during that it wasn’t able to drive the motor with enough power. After the self-learning phase, upon giving throttle, the motor would just rotate very slowly, and produce a lot of noise. Their team couldn’t really help much. We can’t really do much with the controller either, there’s no firmware support - they just have an android app with a few parameters exposed. I will attach a document with all the parameters so you can have an idea.

Our motor is not damaged of course, it runs fine with open-loop ESCs such as the FLAME ESC. We are assuming that these off-the-shelf controllers are built specifically for the more popularly used 4-pole brushless motors. We have an old 48V 4-pole BLDC and the EZkontrol motor controller from Golden Motors was able to run it easily, on the very first go.

We concluded that it could be to do with the high pole-pairs of our motor - 35, i.e. 70 poles, that caused this incompatibility.

Now I am looking into VESC-based ESCs and the Flipksy 75200 Pro seems quiet promising. I have this lingering doubt though, if even that may fail. With the EZkontrol controller, we still don’t exactly know what didn’t work and given how it’s just a black box at this point, there’s no way to find out either.

I hope someone here can give some helpful suggestions. Here are the motor details:

  1. Battery DC voltage: 72 V
  2. Continuous Power: 6.0 kW
  3. Peak Power: 8.5 kW
  4. Max. Speed: 1000 RPM
  5. Peak shaft torque: 190 Nm
  6. Stall Torque: 250 Nm
  7. Line Resistance: 294.6 mOhms
  8. Line Inductance: 0.739 uH
  9. Back-EMF Constant (Peak Line-Line): 214 V/kRPM
  10. No. of Poles: 70
  11. Ld: 0.396 mH
  12. Lq: 0.369 mH
  13. Rotor Moment of Inertia: 0.0347 kg.m^2

If someone has ran a high pole-pair motor using a similar VESC-based controller, do share your experience as well!

Here’s a link to the document I have created that lists all the EZ-Tune app parameters. And here’s the EZkontrol controller’s User Manual, for more context.

Thanks for taking the time to read! I hope I get some good insights!
Best Regards!!