Brushless and sensorless motors vibrate violently when accelerated to a certain degree

Hubble林

Brushless and sensorless motors vibrate violently when accelerated to a certain degree [Copy link]

 

  I use a brushless sensorless motor board. The motor starts to rotate fine at first, but after accelerating to a certain degree, the motor vibrates violently and the speed cannot be increased. What is the reason? Please guide me. There seems to be no speed limit in the program.

Hubble林

The first picture shows the waveform of the motor when the vibration occurs, and the second picture shows the normal state.

gmchen

Is there resonance? I am not a mechanic, I am just making a physical guess based on the original poster's description, I don't know if it is correct, it is for reference only.

Hubble林

gmchen posted on 2019-5-27 21:42 Is there resonance? I am not a mechanic, I just make a physical guess based on the description of the OP, I don't know if it is correct, just for reference.

How is resonance?

maychang

Without seeing your motor or your circuit, I can only guess. My guess is that your circuit has overcurrent protection, and after a period of time after the overcurrent protection is activated, it can exit the protection state. This produces the waveform in the first photo. It's just a guess, for reference only.

chunyang

I agree with maychang's analysis above and suggest you to check the load parameters of the driver board carefully.

Hubble林

maychang posted on 2019-5-28 06:22 I haven't seen your motor or your circuit, so I can only guess. I guess your circuit has an overcurrent protection function, and after the overcurrent protection is activated, it will be...

Do you mean that the jitter at a certain speed and the inability to increase the speed is caused by the overcurrent protection?

maychang

Hubble Lin posted on 2019-5-28 15:36 Do you mean that the reason for the over-current protection is that the speed cannot go up when it jitters when it reaches a certain stage?

I can only say: I guess this is the reason.

yongtan_2004

This is usually caused by an error in the rotor position.

wegfvjdcelb

Is your solution's maximum electrical speed at the upper limit? Is the rotor position wrong?

powerlove

Is your solution's maximum electrical speed at the upper limit? Is the rotor position wrong?