Method and apparatus for error correction in position sensing ci

Details Method and apparatus for error correction in position sensing ci Method and apparatus for error correction in position sensing ci

1981-07-10

1982-09-28

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318632, 340347SY, G05B 106

Patent

active

043520502

ABSTRACT:
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.

REFERENCES:
patent: 3646547 (1972-02-01), Hoffman
patent: 4268786 (1981-05-01), Rohrle
patent: 4282468 (1981-08-01), Barker et al.
patent: 4310790 (1982-11-01), Marquis

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