Current determination in a permanent magnet electric machine
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United States of America Patent
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-
May 9, 2006
Grant Date -
Aug 8, 2002
app pub date -
Jan 23, 2002
filing date -
Sep 16, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method and system for determining a torque current in an electric machine coupled to a polyphase bus. The method comprises: detecting a rotational position of the electric machine with a position encoder; controlling an inverter comprising a plurality of switching devices, the inverter having an input coupled to a direct current bus, and an output coupled to the polyphase bus. Where the inverter is responsive to commands from a controller coupled to the inverter and to the position encoder. The method also includes measuring a current from the direct current bus; and capturing the current at a predefined interval of time.
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