I’m trying 3PWM and 6PWM BLDCmotor openloop at GD32F103.
However, I have a problem and need your help.
It is spinning nicely. The motor rotates at approximately the same RPM as specified in the motor catalog.
The motor revs beautifully at lower RPM, but as the RPM rise, a noise-like sound that was not present in the 3PWM is mixed in. In addition, the duty setting was clearly larger than 3PWM, and as a result, I thought the efficiency was lower.
The 3PWM and 6PWM duty setting method uses SimpleFOC’s “SinePWM”.
The PWM waveform outputs HI around the center of the cycle based on the duty calculated by SinePWM, and then outputs HI in the opposite phase after a set dead time using the timer function.
When noise begins to mix at 6PWM, it can be improved by using the debugger to change duty and dead time in real time, but the noise sound is still more intense than at 3PWM.
I want to run motor 6PWM as smoothly as 3PWM, so I am trying to figure out the cause of this noise
sound but have not figured it out yet.
I’d like some food for thought, so do you have any idea what I should look out for when changing from 3PWM to 6PWM?
Do you have any idea for this situation?