| 摘要 |
A method and apparatus for correcting an error in a position sensing circuit employing a resolver, an Inductsyn (trade name) or the like. Accurate position sensing is not possible in a position sensor using a resolver or the like when the electromagnetic coupling between the secondary winding and a cosine excitation coil is different from that between the secondary winding and a sine excitation coil. To eliminate a position sensing error caused by such a disparity in electromagnetic coupling, the present invention varies an electrical angle alpha by a predetermined amount at a first position where the secondary winding is electromagnetically coupled mainly with the cosine excitation coil, and at a second position where the secondary winding is electromagnetically coupled mainly with the sine excitation coil, finds the amount of change in the secondary voltage, or in a frequency proportional thereto, which accompanies the change in the electrical angle, and regulates the excitation voltage of each of the excitation coils in such a manner that the amount of change at the first and second positions is equal.
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