PERMANENT-MAGNET TYPE ROTATING ELECTRICAL MACHINE

摘要

Provided is a permanent-magnet type rotating electrical machine that can detect the position of a rotor with high precision upon executing sensor-less driving. The permanent-magnet type rotating electrical machine is provided with a rotor that has a plurality of magnetic poles arranged thereon with regular intervals, and a stator that comprises a plurality of teeth and armature windings. The permanent-magnet type rotating electrical machine has a high-frequency voltage having a frequency and amplitude different from those of a torque-generating voltage applied to the armature windings, and has the positions of the magnetic poles of the rotor estimated using a current trajectory of a high-frequency current that was measured. The permanent-magnet type rotating electrical machine is formed such that, when the measured high-frequency current is dq converted, current trajectory on dq axes will become an ellipse shape, and such that the angle fluctuation range of the major axis of the ellipse with respect to load current and rotor position will enable a prescribed position-estimating resolution.