Position detecting apparatus and method therefor

Details Position detecting apparatus and method therefor Position detecting apparatus and method therefor

1996-11-04

1998-04-14

Martin, David S.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318636, 318603, 318608, 318661, G05B 1931

Patent

active

057396590

ABSTRACT:
Excitation signals having a phase difference of 120.degree. are generated based on a count of a ring counter and they are supplied to a phase detection type resolver. An output of the resolver is compared with zero level by a comparator to generate uncorrected position data .theta..sub.F which is supplied to a digital delay circuit to delay it in accordance with a position correction value .DELTA..theta. from a position correction ROM to generate corrected position data .theta..sub.B. The corrected position data is supplied to a latch circuit which latches a count of a ring counter and a velocity detection circuit to produce resolver position data .theta..sub.P and velocity data .DELTA.T, which are added and the sum is supplied to the position correction ROM as address data. The velocity data .DELTA.T is converted to a pulse by a pulse generator and it is accumulated by an accumulation counter to detect a position of a moving part. High precision position detection is attained with reduced velocity ripple even when a rotation velocity of the resolver is high.

REFERENCES:
patent: 3662242 (1972-05-01), Wacker et al.
patent: 3924721 (1975-12-01), Reynolds
patent: 4282468 (1981-08-01), Barker et al.
patent: 4701839 (1987-10-01), McNally et al.
patent: 4831510 (1989-05-01), Dummermuth et al.
patent: 5418439 (1995-05-01), Whang

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