View Full Version : Help, size of replacement motor

gary hart
09-20-2011, 12:02 PM

Helping someone to change his hydraulic pump motor from 3 phase to single phase and wanting to use 115 VAC if possible.

I don't understand this motor rating. Would a standard 1725 rpm motor of 1-1/2 hp rating with capacitor start work for a replacement?

A VFD with 115 VAC input doesn't seem to be an option for a 1-1/2 hp motor.

09-20-2011, 12:07 PM
On 60hz, it's a 900watt (1.2hp) 1800 rpm type that develops full hp when loaded to 1670rpm.

A 1725rpm 1.5hp will work fine.

gary hart
09-20-2011, 02:52 PM
Thanks for answer...... gary

09-20-2011, 03:00 PM
If you want to take the lazy approach and keep the original motor, you can buy VFD's that take 110 volt single phase input and generate 3 phase 220 volt output.

I think the max motor size for these special VFD's is 2 HP.

You can see them at www.dealerselectric.com .

Paul T.

gary hart
09-21-2011, 02:03 PM
Yes, like the lazy and easy way. Didn't know one was available at reasonable price. Paul T.. thanks for letting me know.