NEODYMIUM PERMANENT MAGNET MOTOR, AND HERMETIC COMPRESSOR INCLUDING NEODYMIUM PERMANENT MAGNET MOTOR

摘要

PROBLEM TO BE SOLVED: To obtain a neodymium permanent magnet motor capable of improving demagnetization tolerance in the vicinity of slits, while keeping or improving the flux density.SOLUTION: A rotor 6 of a permanent magnet motor (motor section) has a plurality of magnet insertion holes 32, into which neodymium permanent magnets 33 are inserted along the circumferential direction thereof, and slits 38 are formed on outer peripheral sides of these magnet insertion holes 32. The neodymium permanent magnet 33 is divided into a plurality of magnets (33a-33c), the slits 38 are arranged with inner peripheral side ends thereof facing between the magnets. Between the magnets facing the inner peripheral side end of the slits 38, a demagnetization flux passage part (bridge 39) having magnetic permeability higher than that of the neodymium permanent magnet 33 is provided, and a width D in the peripheral direction of the demagnetization flux passage part has a relationship of D≤d, for the width d between the inner peripheral side end of the slit 38 and magnet insertion hole 32.SELECTED DRAWING: Figure 4