Salient-pole type linear motor and reciprocal double piston compressor with salient-pole type linear motor

Abstract

A salient-pole type linear motor comprises a housing, a stator, a mover and coil units. The stator comprises a middle stator core and two side stator cores which have a plurality of magnetic poles on the inner peripheral surface of the stator. A plurality of coil units is wound around the plurality of magnetic poles. By generating a current that passes through the coil units sequentially, magnetic fields are produced about the magnetic poles and an attractive force is produced to enable a reciprocal motion of the mover by magnetic attraction. The salient-pole type linear motor further connects two compressor cylinders at both ends thereof for compressing gases or draining fluids so as to form a reciprocal double piston compressor with a salient-pole type linear motor.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit under 35 U.S.C. §119 of Taiwanese Patent Application No. 101128744, filed Aug. 9, 2012, which is hereby incorporated by reference in its entirety.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to a salient-pole type linear motor and a reciprocal double piston compressor with the salient-pole type linear motor, in particular to the salient-pole type linear motor that uses magnetic poles of a stator core arranged in front and behind a stator to drive coils on the front and rear magnetic poles to produced a magnetic field in order to attract a mover by the magnetic poles to perform a reciprocal linear motion along a central axial direction of the stator. Two compressor cylinders are further connected to both ends of the salient-pole type linear motor for compressing gases or draining fluids to form a reciprocal double piston compressor with the salient-pole type linear motor.[0...

AI Technical Summary

Benefits of technology

[0016](1) In the salient-pole type linear motor of the present invention, the length of the stator can be extended in the unit of a middle stator core and two side stator cores, and the length of the salient pole of the mover can be increased in order to increase the motion stroke of the mover.

[0017](2) In the salient-pole type linear motor of the present invention, the number of salient poles of the mover and the number of magnetic poles of the stator core can be increased to strengthen the magnetic attraction of the magnetic pole to the mover, so as to enhance the driving force of the motor effectively.

[0018](3) In the salient-pole type linear motor of the present invention, a plurality of compressor cylinders with a piston can be coupled, such that the reciprocal linear motion of the mover of the salient-pole type linear motor can be used to reduce the lateral force produced during the piston motion and also reduce friction and loss, so as to further achieve the effects of high mechanical strength, low mechanical loss, low noise and high efficiency.

[0019](4) In the salient-pole type linear motor of the present invention, a high magnetic flux density of the coil is for

Problems solved by technology

However, the conventional reciprocal compressors are limited by the total volume of the compressor, and the general cylindrical linear motor cannot meet the requirement for the high driving forces.

Although the reciprocal compressor driven by the conventional rotary motor has the advantages of low cost and a broad operation range, yet a lateral force may be produced during the compression process of th

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