
207Electric Machine and Electric Drive Simulation
CR diagram is shown in Figure 5.42. The block carries out a hysteresis regulation.
If, for example, the phase a current is less than the reference, and both currents are posi-
tive, the inverter switch T1 is closed, and in the opposite relation the inverter switchT2
is closed and so on. The regulation method is simple and rapid and does not demand
the information about IM parameters. The drawback is an increased distortion of the
current shape. At the controller outputs, the ip-ops are set (are not shown in gure),
with the help of which the maximum transistor switching frequency is limited. ...