8 Polyphase Induction Motors
The basics as well as the details of the structures and the types of rotors of polyphase induction motors have been introduced in Chapter 3. The concept of rotating magnetic field in the air gap has also been introduced in the chapter. In induction motors, we need to apply a three-phase supply at the stator, whereas no supply is required at the rotor. That is why the three-phase induction motors are known as singly excited motors. Since these types of motors rotate at a speed below the synchronous speed (known as asynchronous speed), they are also called asynchronous motors. This chapter introduces the details of the theoretical aspects of the induction motors.
8.1 ROTOR CURRENT
If the electromagnetic force (emf) ...
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