Method and apparatus for controlling induction motor for compressor
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United States of America Patent
Stats
-
Jun 2, 1992
Grant Date -
N/A
app pub date -
Mar 5, 1991
filing date -
Jul 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
DC power is supplied to an induction motor for a compressor by switching ON/OFF in response to a modulated voltage waveform obtained from modulating waves which are used for generating AC power for energizing an induction motor and a carrier wave according to PWM theory. The compressor has a compressing element rotated by the induction motor, and the modulating wave is corrected according to a rotational angle of the compressing element. A sine wave having the same frequency as the modulating wave is added to the modulating wave, and a phase of the sine wave is controlled so that a maximum value of the sine wave corresponds to the compression stage of the compressing element. Thus, a rotation speed of the compressing element is constant in a suction stage and a compression stage.
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