초록

A method and apparatus by which the output value of a resolver position detection system is compensated for systematic phase shift errors produced by signal conditioning circuitry through which the signal passes.

대표청구항 ▼

For use in conjunction with a resolver and its operative circuitry, the resolver being disposed for monitoring the relative position of an object, a method providing a position indicative value compensated for errors caused by systematic phase shifts in the resolver output signal with respect to ref

For use in conjunction with a resolver and its operative circuitry, the resolver being disposed for monitoring the relative position of an object, a method providing a position indicative value compensated for errors caused by systematic phase shifts in the resolver output signal with respect to reference signals, comprising the steps of: (a) providing the reference signals as excitation for the resolver, the resolver being responsive to produce said output signal such that its phase relationships with the reference signals are indicative of the monitored position; (b) passing at least one reference signal through substantially the same circuit path as that through which the resolver output signal passes to thereby generate a phase shift value indicative of the amount of systematic phase shift induced by said circuit path; (c) determining the amount of phase shift between the resolver output signal and said at least one reference signal after passing the resolver output signal through said circuit path, to provide a value indicative of the apparent monitored position; and (d) subtracting said phase shift value of step (b) from the apparent position indicative value of step (c) to provide a compensated position value indicative of the true monitored position.