Module4 Single phase Induction motor By Prof Arjun

Module-4 Single phase Induction motor By Prof. Arjun Kumar Asst. professor Electrical Engineering B. C. E. Bhagalpur

Module-4 Lecture -30 Topic covered as: ü Constructional features ü Double revolving field theory ü Rotor slip

Introduction of 1 -ph. Induction Motor • A single-phase induction motor comprises a single-phase distributed winding on the stator and normal squirrel-cage rotor. • Availability of a wide variety of small-size motors of fractional kilowatt ratings. • Motors are employed in fans, refrigerators, mixers, vacuum cleaners; washing machines, other kitchen equipment, tools, small farming appliances, etc. • Behaviour of single-phase induction motor can be explained on the basis of double-field revolving theory and cross magnetic field theory. • Single phase induction motors are simple, robust, reliable and cheaper for small ratings. They are available up to 1 KW rating

CUT SECTION VIEW

Types of single phase induction motor 1. 2. 3. 4. 5. Split phase induction motor Capacitor start capacitor run induction motor Shaded pole induction motor Permanent split capacitor motor

Constructional features Fig. 4. 1 single phase I. M

Main parts of Single ph. I. M. having two main parts: Ø Stator Ø Rotor Stator: stator is a stationary part of induction motor. A single phase AC supply is given to the stator of single phase induction motor. In this machine stator having two windings one is main winding and other is auxiliary windings. Rotor: rotor is a rotating part of an induction motor. The rotor connects the mechanical load through the shaft. The rotor in the single-phase induction motor is of squirrel cage rotor type.

constructional view Fig. 4. 2 constructional view of 1 -ph. I. M.

Double revolving field theory Fig. 4. 3 single phase I. M

Two rotating fields rotating equivalent of a pulsating field Fig. 4. 4

Rotor slip with respect to two rotating field Fig. 4. 5

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