October 2013
Beginner to intermediate
352 pages
15h 8m
English
Content preview from Electric Motors and Drives, 2nd Edition
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7
INVERTER-FED INDUCTION MOTOR
DRIVES
INTRODUCTION
We saw in the previous chapter that the induction motor can
only run efficiently at low slips, i.e. close to the synchronous
speed of the rotating field. The best method of speed control
must therefore provide for continuous smooth variation of the
synchronous speed, which in turn calls for variation of the
supply frequency. This is achieved using an inverter (as
discussed in Chapter 2) to supply the motor. A complete speed
control scheme which includes tacho (speed) feedback is shown
in block diagram form in Figure 7.1.
Figure 7.1 General arrangement of inverter-fed variable-frequency
induction ...
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