Is grinding normal?

[alex retha]

I just installed a brand new servo motor and I have no experience with these but the noise it is making does not sound right to me.

At low speeds, the motor makes a noticeable grinding noise, and that sound gets louder as I put more load on it. But once the speed goes over about 700 rpm, the noise almost disappears entirely. Is that kind of noise normal for a new servo motor, especially under a low load? Also, the minimum speed is 400 rpm and it only seems to change in big jumps, like 400 or 500 rpm with nothing in between. I can't get a smooth speed change. Is that normal for these kinds of motors or is there a setting I need to adjust?

 

[great OZ]

Yes it is. That's a classic industrial servo motor. It's clearly saying it's working hard against a load below their optimal operating speed. It's a result of the motor controller sending quick, powerful bursts of current to the motor windings to maintain the commanded position and torque, which causes a slight, rapid stuttering that sounds like a grind.
But since the noise fades completely above 700 RPM, it's clearly related to the control loop stability at very low frequencies. That's a know issue.

 

[li'lpowh]

Do you have access to the settings? You might want to start with feedback tuning or checking the parameters for acceleration. If not, you better check with your supplier if this is an expected behavior.

 

[alex retha]

I have tried checking the settings and it seems I do not have access. I might reach out to the supplier.

Is there a way that I can get full access to the settings or do I have to keep on contacting them if I need adjustments?