Patent ID: 9653974
Date: 2017-05-16
CPC Classifications: H02K,Y10T

Claim:
1. A method for manufacturing a core of a rotating electrical machine, the core comprising a plurality of accommodating slots, and a plurality of permanent magnets, each permanent magnet being accommodated in one of the accommodating slots, the method comprising: injecting a liquid crystal polymer, which is a fixing agent, into a space between an inner surface of each accommodating slot and an outer surface of the associated permanent magnet, the injecting of the liquid crystal polymer including flowing the liquid crystal polymer through a heating portion, and maintaining a temperature of the core at one of a substantially ordinary temperature and a temperature between 40 and 80 degrees centigrade, as the fixing agent is being injected into the space, by flowing a coolant through a coolant passage arranged above the core, wherein the liquid-crystal polymer is injected into the space at a temperature between 300 and 350 degrees centigrade, the liquid-crystal polymer has a melt viscosity of 1.2 to 8.0 pascal-seconds at 300 to 350 degrees centigrade and at a shear speed of 1000 sec the heating portion is arranged above the coolant portion.