Variable reluctance type angle sensor

A variable reluctance type angle sensor, comprising:

• a stator including a core member, which has a plurality of teeth arranged in a circumferential direction, and a plurality of excitation coils respectively wound about the teeth such that magnetic poles of the teeth have different polarities alternately in the circumferential direction, wherein an input voltage is supplied to the excitation coils, only a single one of the excitation coils is wound about each of the teeth, the excitation coils are divided into either one of first and second excitation coil groups, the first and second excitation coil groups each include a pair of the excitation coils having voltages of opposite phases from each other, a first phase output voltage and a second phase output voltage are respectively generated by combining the voltage of one of the pair of the excitation coils and the voltage generated by inverting the phase of the voltage of the other one of the pair of the excitation coils;
• a rotor radially facing the teeth of the stator, wherein the rotor has a shape such that gap permeance with respect to the stator changes in a sinusoidal fashion in accordance with the rotational angle of the rotor;
• and
• a computation section, wherein the computation section obtains the first phase and second phase output voltages and detects the rotational angle of the rotor based on the first phase and second phase output voltages.