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UNIT 3. INDUCTION MOTORS

1 UNIT 3. INDUCTION MOTORS OBJECTIVE The aim of this chapter is to gather knowledge about the following topics of INDUCTION MOTORS . 1. Construction, types and principle of operation of 3-phase INDUCTION MOTORS . 2. Equivalent circuit of 3-phase INDUCTION motor. 3. The performance calculation by means of finding torque, slip and efficiency. 4. Different types of starters like auto-transformer starter, star-delta starter. 5. Various methods of speed control 3-phase INDUCTION motor. 6. Principle of operation of single phase INDUCTION motor. INTRODUCTION An INDUCTION motor (IM) is a type of asynchronous AC motor where power is supplied to the rotating device by means of electromagnetic INDUCTION . The INDUCTION motor with a wrapped rotor was invented by Nikola Tesla Nikola Tesla in 1882 in France but the initial patent was issued in 1888 after Tesla had moved to the United States.

star-connected rotor winding are brought to three slip rings on the shaft so that a connection can be made to it for starting or speed control. It is usually for large 3 phase induction motors. Rotor has a winding the same as stator and the end of each phase is connected to a ... Autotransformer starting. 1. Rotor resistance starting . 1 1, ...

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