Importance

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Abstract

In a rotation sensor having a resolver attached to a rotor and a signal processing unit for angle detection for supplying a reference signal having a predetermined periodic waveform to the resolver, allowing the resolver to generate a sin signal having a waveform obtained by amplitude-modulating the reference signal by sin .theta. and a cos signal having a waveform obtained by amplitude-modulating the reference signal by cos .theta., and detecting the angle .theta. on the basis of the sin signal and cos signal, there are provided a signal processing unit for rotation detection for outputting a rotation pulse signal and a reference position signal on the basis of the angle .theta. and a signal process abnormality detecting unit for detecting the presence or absence of an abnormality in the signal processing unit for angle detection on the basis of the angle .theta. and an angle .theta.' calculated from both of the rotation pulse signal and the reference position signal of the signal processing unit for rotation detection. When an abnormality occurs in an output of the signal processing circuit for obtaining the angle of the rotor from the output of the resolver as an angle detecting apparatus, the angle cannot be accurately detected. In order to solve the problem, an apparatus and method which can detect an abnormality in an output of the signal processing circuit are provided.

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First Claim