Switching method and apparatus for increasing efficiency of an i

Details Switching method and apparatus for increasing efficiency of an i Switching method and apparatus for increasing efficiency of an i

1993-12-28

1996-03-05

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 41, H02M 700

Patent

active

054973139

ABSTRACT:
A switching method and apparatus for increasing the efficiency of an inductive motor. A switching device connects, according to a PWM process, a D.C. voltage (E) to an inductive motor creating a low-frequency contribution UmLF rising from 0V to the peak voltage at the beginning of each half period T/2. The peak voltage is maintained for at least one sixth of a period T/6 creating a plateau and, then, the switching device connects, according to the PWM process, the D.C. voltage (E) to the inductive motor for the remainder of the half period T/2 creating a low frequency contribution UmLF declining from the peak voltage to 0V. With this arrangement, motor vibration is reduced and efficiency is increased.

REFERENCES:
patent: 4580064 (1986-04-01), Varnovitsky
patent: 5264775 (1993-11-01), Namuduri et al.

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