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Device for detecting rotation of rotary shaft and rotation controlling apparatus using the same

  • US 5,239,490 A
  • Filed: 09/12/1990
  • Issued: 08/24/1993
  • Est. Priority Date: 09/20/1989
  • Status: Expired due to Fees
First Claim
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1. A device for detecting the rotating angle of a rotary shaft comprising:

  • signal generating means for generating two signals which vary in amplitude in accordance with the rotating angle of said rotary shaft and have a predetermined phase difference therebetween;

    means for detecting levels of the center voltages and the amplitudes of said two signals from said signal generating means;

    means for correcting the detected level of the center voltage and the detected amplitude of each of said two signals using the detected level of the center voltage of the other of said two signals; and

    means for calculating the rotating angle of said rotary shaft using said corrected center voltages and amplitudes of said two signals.

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