When a particular induction motor is started at its full-rated voltage, its starting torque is 20% greater than the load torque. By how much could the supply voltage be reduced before the motor would not start?

When a particular induction motor is started at its full-rated voltage, its starting torque is 20% greater than the load torque. By how much could the supply voltage be reduced before the motor would not start?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 16RQ: When a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops...

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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

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When a particular induction motor is started at its full-rated voltage, its starting torque is 20%
greater than the load torque. By how much could the supply voltage be reduced before the motor
would not start?

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