
204 Electric Motors and Drives
SINGLE-PHASE INDUCTION MOTORS
Single-phase induction motors are simple, robust and reli-
able,
and are used in enormous numbers especially in dom-
estic and commercial applications where three-phase
supplies are not available. Although outputs of up to a few
kW are possible, the majority are below 0.5 kW, and are
used in such applications as refrigeration compressors, wash-
ing machines and dryers, pumps and fans, small machine
tools,
tape and record decks, printing machines, etc.
Principle of operation
If one of the leads of a 3-phase motor is disconnected while it
is running light, it will continue to run with