Bearingless motor rotor and bearingless motor

摘要

PROBLEM TO BE SOLVED: To provide a rotor for a bearing-less motor and a bearing-less motor capable of being operated at variable speeds at a low cost and with high efficiency over a wide speed range.;SOLUTION: Magnets 12 form a laminated part 12a, a connecting part 12b, and an additional part 12c by arranging rectangular parallelepiped magnet pieces 16. The laminated part 12a is one of both ends in a circumferential direction, and prevents irreversible demagnetization by being laminated so as to have a thickness in the radial direction. The connecting part 12b increases a bearing capacity for supporting the shaft of the bearing-less motor by reducing the thickness of the magnet with low magnetically permeable in the radial direction. Generation of overcurrents which reduce the efficiency of the motor is reduced by dividing the magnets 12 into small magnet pieces 16. The distance d is set larger by mounting the connecting part 12b into the part deeper than the surface of the rotor 10, and the generated reluctance torque is more increased. Magnetomotive forces are increased by mounting the magnet polarized in the direction perpendicular to the laminated part 12a in the additional part 12c.;COPYRIGHT: (C)2005,JPO&NCIPI