Figure 6.2 (a) Thyristor soft-starter, (b) typical motor current waveforms
able so that each pair conducts for a varying proportion of a
cycle. Typical current waveforms are shown in Figure 6.2(b):
they are clearly not sinusoidal but the motor will tolerate
them quite happily.
a
Synchronising
& Firing
Circuits
High
Firing Angle Delay
Low
178 Electric Motors and Drives
A wide variety of control philosophies can be found, with
the degree of complexity and sophistication being reflected in
the
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