Position sensing apparatus for measuring the angular position of a rotor relative to a stator having a plurality of teeth with excitation windings and plural phase reception windings

Claim 1

A sensor for measuring the angular position of a rotor relative to a stator, comprising a rotor made of a magnetic material and including p lobes, where p is an integer greater than one, a stator disposed around the rotor and made of a magnetic material and including a number of teeth, said number being equal to 2n.p, where n is the number of electrical phases of the sensor and greater than one, each tooth being surrounded both by an excitation first winding and a single reception second winding corresponding to one of said n phases, the excitation windings being connected together in series and disposed on the teeth such that the windings on two circumferentially adjacent teeth produce magnetic flux in opposite directions, the entire set of said excitation windings being powered by an alternating current or voltage, the reception windings relating to a same phase being connected in series and when n is an odd number, the entire set of reception windings relating to the same phase being wound in a same direction and when n is an even number, two reception winding relating to the same phase which are offset by 180 electrical degrees, being wound in opposite directions, each reception winding relating to the same phase being wound on every n th tooth and the windings of each phase being displaced one tooth from the windings of another phase, the envelope of the signal at the terminals of a phase representing the angle of rotation of said rotor relative to said stator to within a scaling factor.