Control unit and control method for permanent magnet synchronous motor
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United States of America Patent
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May 7, 2013
Grant Date -
Jan 13, 2011
app pub date -
Jun 30, 2010
filing date -
Jul 9, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
If magnitude relations between the output terminal voltage based on a DC negative terminal of the inverter and a threshold voltage that is a fixed value are compared, polarity thereof is changed at a predetermined rotor phase. The magnitude relation, for example, is detected by an inexpensive and simple apparatus such as a level shift circuit and a NOT circuit. The rotor phase of the permanent magnet synchronous motor is inferred on the basis of changes in the magnitude relation and if it is differentiated, a rotation speed is inferred. If the inferred values of the rotor phase and rotation speed are fed back to synchronous operation or vector control, the free-running permanent magnet synchronous motor is restarted.
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