I have a 1.5 KW VFD inverter on the field. I would like to use it to drive a 90 watt 3 phase motor for speed control application. The motor has a gear box 700:1. The linear speed of the roller are about 1 mm/sec, and the torque is about 40 N*M.

But I think the motor power rating is too small and will create a missmatch with the inverter (1.5KW). Does anyone have experience of using 1.5 KW VFD to control small motor?

 

From my experience, There is no problem if the size of VFD is more than motor.

 

I'm using 1.5 KW ABB VFD for Boiler coal feeder Application. This is 1 month old installation. Motor & VFD's are of same capacity(1.5KW). I think if we know the Exact maximum torque required by our application & that delivered by the VFD; then it is easy to choose the VFD.

ghate Vinod
ghatevinod [at] gmail.com

 

Dear Mr. Vinod,

Coal feeder is constant torque application. So its depends on the vfd model which VFD u used.

Regards,
Gunjan Ruparelia

 

Winston,

Just keep in mind that the 1.5KVA drive's internal overload trip point will be much higher than you would want for a 90W motor.

Therefore, you should use external circuit protection (external to the drive) that is sized for the 90W motor -- not the 1.5KVA drive.

Hope this helps!