Single phase motors > 3 phase supply ?

Thread Starter

baronpork

Joined Apr 16, 2013
62
Educate me please.

Can a single phase motor be connected to 3 phase vfd ?
I know that the motor in question has 3 pairs of posts for bus bars (to change rotation direction, motor is 1.1kw 1ph).
Can a single phase motor be connected to variable freq drive by taking off caps and wiring them directly ?

Just starting messing with 3ph, need starting point in research.
 

MaxHeadRoom

Joined Jul 18, 2013
19,202
In short, NO.
Also 1ph cap start/run motors tend to fall out of run when the frequency is varied (lowered) , particularly when under load.
Max.
 

jayanthd

Joined Jul 4, 2015
902
Educate me please.

Can a single phase motor be connected to 3 phase vfd ?
I know that the motor in question has 3 pairs of posts for bus bars (to change rotation direction, motor is 1.1kw 1ph).
Can a single phase motor be connected to variable freq drive by taking off caps and wiring them directly ?

Just starting messing with 3ph, need starting point in research.
It must be a capacitor start, capacitor run, single phase submersible pump.
 

MaxHeadRoom

Joined Jul 18, 2013
19,202
You can drive a 1 ph motor from a 3 ph line,
All those guys over at CNCzone would love to know that, they have all been buying 3 phase motors for their VFD's.
The OP question was regarding VFD's. for 1ph motors.;)
P.S. By the way, I checked out the Danfoss site and video and I could not see anywhere where they mention cap start/run 1ph motors?
Max.
 
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