TORQUE V VOLTAGE

In a message dated 3/1/2006 4:26:17 PM Mountain Standard Time,
john_glynn57@... writes:

When using a step down transformer to achieve lower speed from a
single phase ac motor I seem to be getting a considerable reduction in
torque. Could anyone explain this effect.





That would be a result of the reduced voltage, and the reduced current also.
Also the blower will be running slower, so the motor can and usually will
overheat, efficiency will also reduce dramatically.

Single phase motors should not be run on a reduced voltage, there really is
no good cheap method of controlling a single phase motor, you need 3 phase,
and VFD, or a Universal AC/DC motor. Or a DC motor.

bill



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