Power Electronics: Converters, Applications and Design by Mohan, Ned; Underland, Tore; Robbins, William

By Mohan, Ned; Underland, Tore; Robbins, William

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The basic design of a squirrel cage induction motor (SCIM) and a wound rotor induction motor (WRIM) are very similar, the main difference being the design and construction of the rotor. The design and performance of AC induction motors is described in considerable detail in Chapter 2: 3-Phase AC induction motors. In AC induction motors, the slip between the synchronous rotating stator field and the rotor is mainly dependent on the following two factors, either of which can be used to control the motor speed: • Stator voltage: Affects both the flux and the rotor current.

The field coil time constant is the most significant factor and there is very little that can be done to improve it, except possibly to use a larger coupling. Closed loop speed control with tachometer feedback can also be used to improve its performance. But there are many applications where the dynamic response or output speed accuracy are not important issues and the eddy current coupling has been proven to be a cost effective and reliable solution for these applications.  +RKIZXOIGR \GXOGHRK YVKKJ JXO\K SKZNUJY In contrast to the mechanical and hydraulic variable speed control methods, electrical variable speed drives are those in which the speed of the electric motor itself, rather than an intermediary device, is controlled.

Consequently, the rotor settles at a speed slightly less than the rotating flux, which provides enough torque to overcome bearing friction and windage. The actual speed of the rotor is called the slip speed and the difference in speed is called the slip. Consequently, induction motors are often referred to as asynchronous motors because the rotor speed is not quite in synchronism with the rotating stator flux. The amount of slip is determined by the load torque, which is the torque required to turn the rotor shaft.

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