Patent ID: 6191550
Filing Date: 2001-02-20
Classification: B60L,G01D,Y02T

Abstract:
An apparatus for detecting an abnormality in a resolver attached to a rotor, comprising:a unit for supplying a reference signal having a predetermined periodic waveform to the resolver;a unit for allowing the resolver to generate a sin signal having a waveform obtained by amplitude-modulating the reference signal by sin .theta. when an angle of the rotor is .theta. and a cos signal having a waveform obtained by amplitude-modulating the reference signal by cos .theta.;a signal processing unit for angle detection for detecting the angle .theta. on the basis of the sin signal and the cos signal;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.; anda 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.