MAGNETIC LEVITAION MOTOR AND PUMP

摘要

Provided are a magnetic levitation motor which generates strong magnetic shaft bearing force with a simple structure, suppresses the generation of an eddy current, and thereby reduces the rotation loss of a rotor, and allows the rotor to be thin and a magnetic shaft bearing structure to be compact, and a pump using the same. A donut-shaped rotor is arranged between a magnetic shaft bearing and a motor portion. A motor york comprises a plurality of protruded poles to which a coil is attached in a radial direction. A magnetic shaft bearing york of the magnetic shaft bearing comprises a plurality of pairs of protruded poles opposed near bothends of the outer periphery side surface of the rotor provided at regular intervals in the shape of a circumference. A coil for magnetic shaft bearing is attached to one of the protruded poles. A first eternal magnet is provided on the other protruded pole. A bridge portion which connects the magnetic shaft bearing and the motor portion with a predetermined gap therebetween is provided on one side of the rotor end. A second eternal magnet is provided between the protruded pole provided on the magnetic shaft bearing york and a bridge york of the bridge portion. A third eternal magnet is provided between the motor york and the bridge york. A plurality of eternal magnets for the motor are provided to be in opposition to the motor york on the inner side of the motor.