Induction Motor Question

Thread Starter

canonfodder

Joined Mar 22, 2014
3
Is anyone here well schooled in single phase induction motors? I want to know if such motor can tolerate a square wave drive instead of a sine wave drive.

I want to drive the motor with a simple square wave so I may apply a variable frequency to adjust the speed over a moderate range.
 

MaxHeadRoom

Joined Jul 18, 2013
19,777
What type of single phase induction motors? small shaded pole motor or cap start/run type?
The former you may be able to variable speed it, but the cap variety do not take well to VFD type control, they tend to drop out of run when lowering the rpm under load, this is the reason that most wanting this type of control replace the 1ph with 3ph motors and supply it from a single phase to three phase VFD.
Max.
 

crutschow

Joined Mar 14, 2008
24,130
Even if you could drive the motor with a square-wave, the square-wave harmonics will cause increased dissipation in the motor and reduce it's efficiency.
 
Top