Linear motor for stirling refrigerator with axial magnetic path

Abstract

The invention provides a linear motor for a stirling refrigerator with an axial magnetic path. The linear motor comprises a stator, a mover and a plate spring, wherein the stator consists of a shell, a left stator core and a left stator coil, a right stator core and a right stator coil and the plate spring; the mover consists of inner magnetic steel, outer magnetic steel, a mover bracket and a piston; the inner magnetic steel is separated from the outer magnetic steel through a magnetism isolating ring; and the inner magnetic steel and the outer magnetic steel have opposite magnetizing directions and are axially magnetized. The linear motor has the advantages that: the magnetizing direction of the magnetic steel is axial; if the mover is deviated along the radial direction when the mover does reciprocating motion along the axial direction, a force opposite to the deviation direction of the mover is produced due to self-correction effects of a stator magnetic field and a mover magneticfield, so the linear motor ensures that the mover is not greatly deviated along the radial direction in a motor running process and plays a role in automatically correcting the deviation caused by anexternal force. Therefore, friction between the piston and a cylinder body can be avoided and the service life of the refrigerator is prolonged.

Description

technical field [0001] The invention relates to a linear motor for a Stirling refrigerator, in particular to a linear motor for an axial magnetic circuit Stirling refrigerator. Background technique [0002] With the development of infrared detection technology, Stirling refrigerators have been used more and more, and the linear motors for Stirling refrigerators are the key driving components of the entire refrigeration system. At present, the commonly used linear motors can be divided into moving coil type and moving magnet type according to the different moving parts. The moving part of the moving coil type linear motor is a coil. Long-term operation will cause fatigue damage to the lead wires, thereby shortening the life of the refrigerator. . The moving part of the moving magnet linear motor is a magnetic steel, which can avoid the problem of shortened life caused by the stretching fatigue of the lead wire. At present, linear motors for long-life Stirling refrigerators ...

AI Technical Summary

Problems solved by technology

The disadvantage of the linear motor with this structure is that if the position of the mover shifts radially during the operation of the motor, a large unilateral magnetic pull will be generated, which will cause friction between the piston and the housing, thereby reducing the life of the refrigerator. High demands are placed on the installation of the motor

During the operation of the motor, if there is a radial offset of the mover, a unilateral magnetic pull will be generated due to the attraction between the magnetic steel and the stator core 3, and this magnetic pull will aggravate the radial offset , eventually causing friction between the piston 7 and the housing 1, reducing the life of the refrigerator

Images