Patent ID: 7183952

Claim:
A resolver comprising: a resolver stator having an excitation winding of one phase adapted to be excited by a power supply and output windings of two phases for outputting a change in the density of magnetic flux as a voltage; a resolver rotor that is arranged at a central portion of said resolver stator and cooperates with said resolver stator for changing a gap permeance between said resolver rotor and said resolver stator in accordance with the rotation of said resolver rotor; and a detection error correction part that corrects an angle detection error of said resolver by using the value of a Lissajous radius of a circular Lissajous waveform obtained from respective amplitudes of an output signal Scos output from said first output winding and an output signal Ssin output from said second output winding of said output windings of said two phases, which are obtained by the following expressions: S cos= K·E ·sin ω t ·cos(θ) S sin= K·E ·sin ω t ·sin(θ) where K represents a voltage transformation ratio of said resolver; E represents said excitation voltage generated on said excitation winding by means of said power supply; ω represents an angular velocity of an excitation signal generated by exciting said excitation winding by means of said power supply; t represents time, and θ represents an electrical angle of said resolver.