Patent ID: 6188196
Filing Date: 2001-02-13
Classification: B60L,H02P,Y02T

Abstract:
An electrical angle detecting apparatus that detects an electrical angle that indicates an electrical rotational position of a rotor of a synchronous motor, comprising:an electrical angle estimator that estimates an electrical angle of the rotor at a predetermined timing as a model value;a voltage applicator that applies a predetermined voltage to a coil of the synchronous motor on a basis of the estimated electrical angle;a detector that detects a current that flows through the coil in accordance with the voltage applied thereto, as a magnetizing current in a direction along a magnetic flux of the rotor and a torque current in a direction that is electrically perpendicular to the magnetic flux of the rotor; andan electrical angle determination device that determines a true value of the electrical angle based on an operation expression employing a single parameter that includes at least a deviation between a value of the magnetizing current detected by the detector and a model value of the magnetizing current determined based on a voltage equation that gives a relationship among a voltage across the coil of the synchronous motor, a current through the coil, and an inductance of the coil.