The starting methods of three-phase induction motors
mainly include three basic categories: direct start, reducedvoltage
start, and variable frequency drive start [1]. Among
these methods, the traditional wye-delta start is an economical,
simple and easy way for reducing the terminal voltage of the
motor. However, the inrush current can only be reduced
slightly even though the motor starts with the wye connection,
as the region A in Figure 1. Furthermore, the current is
especially large when the winding connections transform from
wye to delta, as the region B in Figure 1.
The starting methods of three-phase induction motorsmainly include three basic categories: direct start, reducedvoltagestart, and variable frequency drive start [1]. Amongthese methods, the traditional wye-delta start is an economical,simple and easy way for reducing the terminal voltage of themotor. However, the inrush current can only be reducedslightly even though the motor starts with the wye connection,as the region A in Figure 1. Furthermore, the current isespecially large when the winding connections transform fromwye to delta, as the region B in Figure 1.
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