Permanent magnet linear motor and compressor having permanent magnet linear motor

Abstract

The invention provides a permanent magnet linear motor and a compressor having the permanent magnet linear motor. According to the invention, the permanent magnet linear motor comprises an external stator which contains an external stator support and an external stator core arranged on the external stator support, and a mover which contains a mover support and N Halbach permanent magnets arranged along the circumference of the mover support, wherein magnetization directions of adjacent Halbach permanent magnets change delta degrees and the Halbach permanent magnets have smooth arc magnetic circuits. The compressor provided by the invention comprises the above permanent magnet linear motor. By the adoption of Halbach array, the magnetization directions of the permanent magnets are optimized, and end leakage is minimized so as to enhance single-side magnetic field. In addition, an inner stator of a motor can be saved, costs of the permanent magnet linear motor are saved, the weight of the permanent magnet linear motor is mitigated, iron loss of the motor is reduced, and efficiency of the motor is raised.

Description

technical field [0001] The invention relates to the field of electric motors, more specifically, to a permanent magnet linear motor and a compressor having the same. Background technique [0002] Linear compressors are mainly developed gradually along with the development of linear motor drive technology. Linear motor is a power device that can directly convert electrical energy into mechanical energy for linear motion. It is a main engine that can provide high power and high thrust drive element. A linear motor generally consists of a stator and a mover, and the mover moves linearly under the drive of the stator. [0003] Since the linear motor can directly produce continuous one-way or reciprocating short-stroke linear mechanical motion, it has changed the traditional intermediate mechanical transmission and transformation links such as chains, wire ropes, conveyor belts, racks and screws, worm gears, and crank linkages. It overcomes the defects of long transmission chai...

AI Technical Summary

Problems solved by technology

The existing moving magnet linear motor adopts the parallel magnetization method, which requires the cooperation of the inner stator to close the magnetic circuit with the outer stator stroke, and the magnetic flux leakage at the end is relatively serious

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