Vesc limiting power in sensored mode

blazingthru

1 µW
Joined
Jan 9, 2019
Messages
2
Bench testing a motor using a VESC. When I run the motor sensorless it outputs power fine, when i run it sensored peak power is limited to 1/4 of sensorless operation. What could be causing this? I run the motor setup each time i switch between sensored and sensorless
 
I've never seen a difference that big, but a while back I noticed a similar problem. I'd been having motor cogging problems when the VESC switched between sensored/sensorless during acceleration.

I played around with the sensorless ERPM value. I found that forcing the VESC to remain in sensored mode by setting the ERPM switchover point really high (higher speed than the motor would ever reach) meant I would have no cogging, but the peak power/speed of the motor was reduced. In my case it was not a huge difference, maybe 10-20%.

This problem happened back when VESC firmware was around version 2. I no longer have that same setup, but that motor is on a different bike with another VESC running newer firmware. It no longer has cogging problems, maybe the hall sensor tracking got improved at some point.
 
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