SMPM motor vaibration and noise in mechanical resonance frequencies: 1.2Hz 2.4Hz 4.8HZ..

[mhass.11]

Hi

I'm running a SMPM motor and i have resonace problem in mechanical system resonance frequencies: 1.2Hz 2.4HZ 4.8HZ and in other frequencies everything is ok. The resonance is low it noload but worse in full load.

I ckecked current controller,angle,speed controller is ok and it's not depended to switching frequency.

I can't see vibration in speed feedback(that has 0.01hz resolution) and everything is smooth.

Do you have any idea about this problem?

[Cristiana SCARAMEL]

Hello @mhass.1​ and welcome to the ST Community.

For better understand what happens, could you share more details?

> I can't see vibration in speed feedback(that has 0.01hz resolution) and everything is smooth.

How did you measure the motor resonance?

What kind of mechanical load are you using?