| Abstract |
The paper describes work on the development of a topology and control of a three-phase DC/AC
PWM converter for an adjustable speed cage induction motor drive system. It is shown that when
using a PWM converter with a low-pass LC filter and applying proposed instantaneous feedback
control method an effective reduction of high frequency harmonics, damaging the motor bearings and
insulation, can be achieved. The proposed control technique of the converter with the instantaneous
LC filter current and voltage feedback loops, is extremely useful when reducing the switching
frequency component and providing a high quality sine-wave variable frequency and amplitude
voltage to the motor. Experimental verification of the proposed topology and control strategy is
provided by 15kW laboratory drive system with conventional cage induction motor. The high quality
sinusoidal output voltage produced by the proposed converter at different motor speeds is presented. |
