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Electrical Machines, 2nd Edition by Smarajit Ghosh

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Appendix H

Solid State of Drives Control

SPEED CONTROL OF DC AND AC DRIVE MOTORS

Motors have become an integral part of our day-to-day lives, with rating ranging from fractional horsepower to hundreds of horsepower, depending on use. We have read about the characteristics of the motors. Now, we will study their speed control, both manual and automatic. Manual control too has been dealt with, and electronic control – manual and automatic – has been introduced. The control operation of any motor includes start, stop, reverse speed and change speed.

SPEED CONTROL OF DC MACHINES

The fundamentals of control of speed of a DC motor have already been discussed. We can use diodes and semiconductor controlled rectifiers (SCRs) to control the applied voltage ...

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