How to remove acoustic noise from a brushless motor? Can PID tuning help?

[msingh]

Hi,

NUCLEO-G431RB + X-NUCLEO-IHM07M1

MCWB 5.Y.3 + STM32CubeIDE 1.7.0

Maxon motor combination: 200142 + 166935 + 673026

BLDC motors are supposed to be "silent" however this doesn't seem to be the case when I attempt to drive the motor with the combination above. I have noticed the amplitude of the sound increases as more torque is requested, I have then tried changing the torque PIDs and they seem to make a difference but not completely solve the issue. PID tuning helped to reduce noise from very loud to loud. The motor itself is fine! I have used the Maxon BLDC controller and it is completely silent with that.

Thanks in advance

Manpreet Singh

[Raül G]

Hello,

try to an other type of control.

I hear that an Field Oriented Control (FOC) the acoustic noise is reduced.

Good luck!

Raül.

[msingh · Accepted solution]

Hi Thanks for your reply. I was already using FOC control as I required to control the rotationa speed by an external analogue signal however I have managed to reduce the electrical noise by heavily losing the PID loops, specially the position control PIDs.

Once again thanks for reply.

Kind regards

Manpreet Singh