Patent ID: 6229231
Filing Date: 2001-05-08
Classification: H02K

Abstract:
A reciprocation motor having a rotor for undergoing reciprocal angular motion, comprising:a rotatably supported main shaft;a rotor fixed to the main shaft and having a cylindrical magnet portion magnetized in a radial direction thereof such that 2n magnetic poles are formed therein, wherein n is an integer;at least one driving coil for reciprocally driving the rotor through a predetermined angular range, the at least one driving coil being formed around the circumference of the rotor; andone or more magnetic sensors for sensing a magnitude of a magnetic field emanating from the magnet portion of the rotor to determine an angular position of the rotor, each magnetic sensor being disposed at a location in the motor at which it is not substantially affected by a magnetic field produced by the driving coil.