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Driving system of AC motor

  • US 20020060548A1
  • Filed: 08/30/2001
  • Published: 05/23/2002
  • Est. Priority Date: 08/30/2000
  • Status: Active Grant
First Claim
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1. A driving system of an AC motor including an inverter which applies an arbitrary alternating current to the AC motor and a controller which transmits control signals to the inverter, the controller including:

  • minute voltage applying means which applies a minute voltage change on a dc axis which constitutes an estimation axis of a magnetic flux of the motor, current observation means which observes an electric current which flows to the motor, and polarity discriminating means which discriminates the polarities of magnetic poles of the motor based on positive-side and negative-side current flow times of ripple components contained in the observed value of the electric current obtained by the current observation means.

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