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BrendonC
Participant

Join Date: Sep 2008
Posts: 1

power rating ac motors 1phase vs 3phase

09/02/2008 5:08 AM

Hello all

A single phase 220V ac brush motor running @50Hz directly driving a circular cutting disc

draws 15A under full load (approx 3.3kW) 1300rpm.

If i was to directly drive the same blade with a 3 phase 4 pole AC induction motor what is the smallest i could use with regards to power rating? Considering the difference in torque, between directly and indirectly excited armature

Thanks From Brendon
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Shawn_V_Elect
Power-User

Join Date: Jan 2008
Location: Silvis, IL (Quad Cities)
Posts: 141
Good Answers: 5
#1

Re: power rating ac motors 1phase vs 3phase

09/02/2008 5:51 AM

You should be able to just look at the HP of the motor on the single phase motor and match it to a similar HP 3 phase motor. The only issue that I could see is frame size. I believe a 3 phase motor of similar HP as the single phase would have a smaller frame size, so you may have to go with a similar frame size motor (which would mean more HP) if you do not wish to reengineer the mounting.

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