You are here

VESC 5.3 HW6 MK5 controller small sensorless motor

4 posts / 0 new
Last post
henkiie
Offline
Last seen: 5 months 2 weeks ago
Joined: 2022-01-26 13:37
Posts: 2
VESC 5.3 HW6 MK5 controller small sensorless motor

I have a VESC 5.3 HW6 MK5 controller and I'm trying to control a relatively small motor. The FOC motor parameter identification used to work but now it fails. It also detects a difference in Lq and Ld but its just a simple BLDC motor and there should be no difference. When the identification was working a lamda of 0.7mWb was detected.

 LD-LQ.PNG

 

- Could it be that the VESC has been damaged?

I supply the VESC with 12.7[V] so the current stays below 3[A]?

- Can such a small motor be controlled by FOC?

Thanks 

 

electricfox
electricfox's picture
Offline
Last seen: 43 min 28 sec ago
VESC Original
Joined: 2019-01-01 17:11
Posts: 60

Your values don't look good. What changed in the meantime when it was working fine? Sure the motor and connections are fine? What motor is it exactly? You can try flashing firmware and bootloader again. Try using a battery, maybe even with higher voltage.

henkiie
Offline
Last seen: 5 months 2 weeks ago
Joined: 2022-01-26 13:37
Posts: 2

Thank you for the suggestion. Have have bought 6 more VESCs in the mean time. I have run the parameter identification with all of them but the come with relatively comparable values:

New VESC 1.PNG

New VESC 2.PNG

New VESC 3.PNG

New VESC 4.PNG

New VESC 5.PNG

New VESC 6.PNG

None of the parameters or controllers get the FOC to work on the motor though. Increasing the voltage from 12-13[V] to 57[V] does improves the FOC  at no load a lot though. How could that improve it?

Unfortunately the motor needs to start with a relatively high load and this still doesn't work. One work around could be to increase the openloop ERPM to a higher value. Would that help?

If you select "FOC" as Motor type you get a lot of open loop parameters like; -ERPM, -ERPM at Min current, -Hysteresis, -Lock Time, -Ramp Time, -Time. If you select BLDC as motor type those parameters disappear. Are those parameters not active anymore? If so, why are those parameters not nessasery in case of BLDC commutation?

electricfox
electricfox's picture
Offline
Last seen: 43 min 28 sec ago
VESC Original
Joined: 2019-01-01 17:11
Posts: 60

Again: What changed in the meantime when it was working fine? Sure the motor and connections are fine? What motor is it exactly?

It looks like there is something wrong with your motor. Are you using a battery? If not, what kind of power supply? Please don´t go over 50,4V (12S battery) for max voltage. More than that is not recommended and can destroy your Vesc´s.

As long as your setup seams wrong, you don´t need to change any other settings. FOC and BLDC Modes just have different parameters to set up.