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.

What is claimed is: 
     
         1 . A salient-pole type linear motor, comprising:
 a housing;   a stator, installed in the housing, and comprising a middle stator core and two side stator cores coupled along a central axial direction, and the middle stator core and the two side stator cores further having a plurality of magnetic poles paired and protruded inwardly;   a plurality of coil units, wound around the magnetic poles; and   a mover, having a shaft and a plurality of salient-poles, and the shaft movably penetrating along the central axial direction through the stator, such that when current is applied sequentially at the coil units, a magnetic field is produced by the coil units wound around the magnetic poles to drive the magnetic poles to attract the mover to perform a reciprocal linear motion along the central axial direction of the stator.   
     
     
         2 . The salient-pole type linear motor of  claim 1 , wherein the middle stator core has the magnetic poles disposed at positions corresponding to the positions of the magnetic poles of the two side stator cores respectively, so that the magnetic poles of the two side stator cores are staggered or arranged opposite to each other along the central axial direction. 
     
     
         3 . The salient-pole type linear motor of  claim 1 , wherein the mover has a number of salient poles equal to the number of magnetic poles of the middle stator core, and the salient poles are disposed at positions corresponding to the positions of the magnetic poles of the middle stator core respectively, and the middle stator core and the two side stator cores are made of iron, silicon steel or a magnetically permeable material. 
     
     
         4 . The salient-pole type linear motor of  claim 1 , wherein the mover is made of iron, silicon steel, a permanent magnet or a magnetically permeable material. 
     
     
         5 . The salient-pole type linear motor of  claim 1 , wherein the middle stator core and the two side stator cores are integrally formed, or the middle stator core is integrally formed with one of the two side stator cores, and the magnetic poles of the two side stator cores are staggered or arranged opposite to each other along the central axial direction. 
     
     
         6 . A reciprocal double piston compressor with a salient-pole type linear motor, comprising:
 a housing;   a stator, installed in the housing, and comprising a middle stator core and two side stator cores coupled along a central axial direction of the stator, and the middle stator core and the two side stator cores having a plurality of magnetic poles paired and protruded inwardly;   a plurality of coil units, wound around the magnetic poles;   a mover, having a shaft and a plurality of salient-poles, and the shaft movably penetrating through the stator along the central axial direction, such that when current is applied sequentially at the coil units, a magnetic field is produced by the coil units wound around the magnetic poles to drive the magnetic poles to attract the mover to perform a reciprocal linear motion along the central axial direction of the stator; and   a plurality of compressor cylinders, each having a piston coupled separately to both ends of the shaft of the mover.   
     
     
         7 . The reciprocal double piston compressor with a salient-pole type linear motor according to  claim 6 , wherein the middle stator core has the magnetic poles disposed at positions corresponding to the positions of the magnetic poles of the two side stator cores respectively, so that the magnetic poles of the two side stator cores are staggered or arranged opposite to each other along the central axial direction. 
     
     
         8 . The reciprocal double piston compressor with a salient-pole type linear motor according to  claim 6 , wherein the mover has a number of salient poles equal to the number of magnetic poles of the middle stator core, and the salient poles are disposed at positions corresponding to the positions of the magnetic poles of the middle stator core respectively, and the middle stator core and the two side stator cores are made of iron, silicon steel or a magnetically permeable material. 
     
     
         9 . The reciprocal double piston compressor with a salient-pole type linear motor according to  claim 6 , wherein the compressor cylinders further comprise a plurality of intake check valves and a plurality of outlet check valves. 
     
     
         10 . The reciprocal double piston compressor with a salient-pole type linear motor according to  claim 6 , wherein the middle stator core and the two side stator cores are integrally formed, or the middle stator core is integrally formed with one of the two side stator cores, and the magnetic poles of the two side stator cores are staggered or arranged opposite to each other along the central axial direction.