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Position detecting device and synchronous motor driving device using the same

  • US 7,746,023 B2
  • Filed: 11/02/2009
  • Issued: 06/29/2010
  • Est. Priority Date: 12/12/2005
  • Status: Expired due to Fees
First Claim
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1. A position detecting device for detecting a motor pole position by using at least two sensor signals, comprising:

  • a position detector for executing position calculation by inputting basic-wave component signals in said sensor signals,a correcting means for correcting so as that a position detecting error is reduced,wherein said position detector extracts said sensor signals in a range between predetermined first and second determination values, thereby converting extracting signals, and said first determination value is larger than said second determination value and is smaller than a maximum value of said sensor signals, and said second determination value is larger than a minimum value of said sensor signals; and

    means for correcting to reduce a position detecting error by calculating signal information representing at least one of a gain, an offset and a phase by using a signal between said first determination value and said second determination value in said extracting signal and making a correction based on the signal information.

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