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Massive overshoot in BLDC current control

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chris1seto
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Massive overshoot in BLDC current control

Hi,

 

I am using BLDC sensored mode with my hoverboard motor. I am using the stock defaults, because I have not been able to get BLDC detect to work at all. no matter what I set, the motor just cogs, or spins up for a fraction of a second then cogs.

 

Using the stock settings and current control mode, the motor does spin smoothly. The problem is that I am seeing a massive overshoot in current starting the motor only sometimes. I attached a graph.

 

Any ideas? I am using fully stock settings. I check my hall signals, they look clean. My battery limits are also fine (32Vin, cutoffs are set to start at 8 volts)

Capture_0.PNG

 

 

 

chris1seto
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Last seen: 3 years 2 months ago
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Some other notes:

 

* Using a Torque VESC from Esk8

* Latest FW from git

* Hoverboard 6.5" motor

frank
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For third party, VESC technology based devices it is hard to tell what is going on with them.

It is probably a cheaper two shunt design, with the shunts placed on the battery side, not the motor side.

Please have a look here: https://vesc-project.com/node/403