Abstract
Abstract:
This paper presents a three-phase induction machine
that employs a single phase auxiliary winding, which is only
magnetically coupled to the stator main winding, and controlled
by an active power filter. The active filter consists mainly of a two
leg PWM voltage source inverter, which together with the
auxiliary winding serves to supply leading reactive power to the
machine. With sufficient ampere-turn capability of the auxiliary
winding and an adequate control algorithm, the computer
simulation results show that it is possible to obtain nearly unity
power factor operation at the terminals of the main winding over
a range of load conditions including rated load. The simulated
power factor of this scheme is compared with the measured result
for a typical practical induction motor.