PWM inverter apparatus
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United States of America Patent
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-
Sep 1, 1987
Grant Date -
N/A
app pub date -
Jun 26, 1985
filing date -
Nov 28, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to a PWM inverter apparatus in which the carrier frequency of the PWM generated voltage is selected to be 8 kHz-16 kHz, and the rotation speed of a motor 9 is controlled so that generated magnetic noise is not audible. Further, a triangular wave oscillating part 11 varying the frequency in response to a signal from a frequency setting part 1 is provided in a control circuit part 2 to control the rotation speed of the motor 9 so that the generated magnetic noise can be limited to the desired value.
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