Answered: in Speed Control of Three Phases I.M.…

in Speed Control of Three Phases I.M. by Variation of Rotor Resistance Explain why pole changing method of speed control cannot be used for slip ring induction motor?

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 17RQ

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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.

Question

in Speed Control of Three Phases I.M. by
Variation of Rotor Resistance

Explain why pole changing method of speed control cannot be used for slip
ring induction motor?

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Objectives: To perform the speed control test on slip ring induction motor by rotor resistance control method. Plot the motor speed characteristics at different values of applied resistance in slip ring of induction motor. Can you explain what happened here? (image below)
in Blocked rotor test of three phase Induction motor. Which loss in the machine is significant in blocked rotor test and why?
Attempt the following: Draw and explain a complete equivalent circuit of single phase induction motor? Explain the Starting of Single Phase Induction Motors?
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Schematic diagram for No - load test on three phase induction motor. Which loss in the machine is significant in no load test and why ?
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1-) Explain why and how star-delta starting is given to induction motors. 2-) Explain the speed control methods of induction motors.
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