Control device for three phase ac generator-motor
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United States of America Patent
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Issued Date -
Mar 30, 2006
app pub date -
Sep 28, 2004
filing date -
Sep 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
For a control circuit of a three-phase alternating current motor-generator, which serves as a three-phase rectifier circuit for charging a battery with power generated by driving the motor-generator as a generator and which also serves as a three-phase inverter circuit for driving the motor-generator as a motor by using a battery and uses MOSFETs as control elements for each of three phases, a control device is provided, which, in case of driving the motor-generator as the three-phase ac generator, uses means for making synchronous rectification by using MOSFETs only on the negative potential side of respective phases and means for delaying and advancing an electric angle of the current carrying control timing by gate control of MOSFETs on negative potential side. When operating the motor-generator to charge the battery, this control device can easily perform the current carrying control for three-phase rectification and effectively generate a constant charging voltage without affection of variations in rotation speed and load.
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