Environmental Engineering Reference
In-Depth Information
T (Nm)
P (kW)
Motor
Power
Torque
With SCR switches
0 1 2 3 4 5 6
Speed (pu)
With GTO or
ac switch
Generator
Figure 5.20 DMIC capability curves with SCR and with ac switches
A B
C D E
Figure 5.21 Classes of ac switches for use in DMIC
concern in the DMIC; because electric machine speeds are high, the base frequency
can be in the kilohertz range.
Transistor ac switches are preferred. Topology 'C' in Figure 5.21 is a conven-
tional 'totem' pole phase leg arrangement that comes with simple and cost-effective
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