Structure for fixing permanent magnet in rotor core

Abstract

A method of fixing a permanent magnet in a rotor core includes: forming a magnet accommodation portion into which a permanent magnet is to be inserted and an internal hole defined in an area adjacent to one end of the magnet accommodation portion; inserting the permanent magnet into the magnet accommodation portion; performing a caulking process by inserting a bar into the internal hole; and pressing a pressing portion toward the permanent magnet using the bar. In particular, the pressing portion is provided between the internal hole and the magnet accommodation portion

What is claimed is: 
     
         1 . A method of fixing a permanent magnet in a rotor core, the method comprising:
 forming a magnet accommodation portion into which a permanent magnet is to be inserted and an internal hole defined in an area adjacent to one end of the magnet accommodation portion;   inserting the permanent magnet into the magnet accommodation portion;   performing a caulking process by inserting a bar into the internal hole; and   pressing a pressing portion toward the permanent magnet using the bar, wherein the pressing portion is provided between the internal hole and the magnet accommodation portion.   
     
     
         2 . The method according to  claim 1 , wherein one end of the permanent magnet comes into contact with the pressing portion and the pressing portion is pressed toward the permanent magnet such that a chamfering process of rounding off both edges of the one end of the permanent magnet is omitted. 
     
     
         3 . The method according to  claim 1 , wherein after the inserting of the permanent magnet, the pressing portion is pressed toward the permanent magnet such that a process of providing epoxy resin into the magnet accommodation portion is omitted. 
     
     
         4 . The method according to  claim 1 , wherein the pressing portion forms a convex shape toward the permanent magnet, and
 the pressing portion comprises a contact area that comes into contact with one end of the permanent magnet and a non-contact area that does not come into contact with the one end of the permanent magnet.