) Recall that the torque produced by the motor of a given geometry is equal to the product of the current through the armature and the magnetic field strength.With a wound-field motor you have the option of changing the current through the field, and hence changing the motor characteristics.
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This presumes the rabbit fits, armature, etc all interchange. Or, more expensively, have your single phase stator re-wound three phase. If you have buckets of time maybe a local voc school will take it on as a class project.
I remember Bill Gosseke, an old school motor re-winder.
For reference, I checked and my motor is a single phase capacitor-start type.
Shaded-pole and "PSC" motors can be controlled with a suitable single phase VFD, which definitely DO exist.
Obviously you need a wound-field motor to achieve this trick.
Opinions expressed in these notes are mine and do not necessarily reflect the policy of the University of New South Wales or of the School of Physics. Simply dropping the voltage with a rheostat will also drop the available torque and power.Single phase induction motors of the types used on machine tools are traditionally considered impossible to use with a speed control, but I will not bet that modern electronic designers have not found a solution.PSC types have one cap for start/run, and no internal switch. Standard single phase motors like capacitance start, or "split phase" so-called (really resistance start) are not controllable with a VFD.The problem is some motorized equipment has table mounts etc cast as part of the endbells.Keep in mind that there are several distinct types of single phase induction motor.