Patent ID: 6831446
Filing Date: 2004-12-14
Classification: G04C,H02K,Y10T

Abstract:
A cogging torque adjustment method for a power generator including a rotor having a permanent magnet rotated by a transmitted rotary drive force, a stator having a rotor accommodation hole, the rotor being disposed in the accommodation hole, a magnetic core, and a power-generating coil wound around the magnetic core, the magnetic core, stator and rotor constituting a first magnetic circuit, and a part of the stator around and adjacent to the rotor constituting a second magnetic circuit, the method comprising the steps of:prior to forming an inner notch on an inner periphery of the rotor accommodation hole, comparing the magnetic reluctance of the first magnetic circuit to the magnetic reluctance of the second magnetic circuit; when the magnetic reluctance of the first magnetic circuit is smaller, forming the inner notch on the inner periphery of the rotor accommodation hole of the stator within an angular range of Â±45Â° around a magnetic flux direction of the first magnetic circuit at a rotation center of the rotor; and when the magnetic reluctance of the second magnetic circuit is smaller, forming the inner notch on the inner periphery of the rotor accommodation hole of the stator within an angular range of Â±45Â° around a magnetic flux direction of the second magnetic circuit at a rotation center of the rotor.