Electric compressor having magnets disposed in magnet slots of rotor core

Abstract

In a method for assembling an electric compressor which contains a rotor having built-in magnets, magnets in a pre-magnetization state are inserted into a plurality of slots of a magnetizing jib made with a nonmagnetic material. After magnetizing the magnets, the magnetizing jib is fitted to the rotor to have the magnets transferred into magnet slots. A magnetizing method and an assembly method for implementing high reliability electric compressors at low manufacturing cost is implemented

1 . An electric compressor comprising:
 a sealed vessel;   a motor having a stator and a rotor rotatable relative to said stator; and   a compressing element operably coupled to said motor to be driven by said motor;   wherein said motor and said compressing element are housed in said sealed vessel;   wherein said rotor includes an iron core portion having a plurality of magnet slots penetrating therethrough;   wherein a plurality of magnets are disposed in said magnet slots of said iron core portion of said rotor; and   wherein said magnets adhere, inside said magnet slots, to said rotor core portion via only magnetic force.   
   
   
       2 . The electric compressor according to  claim 1 , wherein
 said magnet slots are kept open.   
   
   
       3 . The electric compressor according to  claim 1 , wherein
 each of said magnet slots has slot end openings at opposing ends thereof opening at axially opposing ends of said rotor core portion; and   for each of said magnet slots, both of said opposing ends are kept open.   
   
   
       4 . The electric compressor according to  claim 1 , wherein
 said magnets are constituted by rare earth magnets.   
   
   
       5 . The electric compressor according to  claim 1 , wherein
 said motor is a dipole permanent magnet type motor, said rotor including a secondary conductor provided circumferentially about said iron core portion and said magnets disposed in said iron core portion.   
   
   
       6 . The electric compressor according to  claim 1 , wherein
 said motor comprises an inverter-driven DC motor.