Patent ID: 9742248
Date: 2017-08-22
CPC Classifications: H01F,H02K,Y10T

Claim:
1. A method for assembling a rotor used in connection with an interior permanent magnet (IPM) rotary machine, the rotor having an axis of rotation and comprising a rotor yoke having bores and a plurality of permanent magnet segments disposed in the bores of the rotor yoke, each of the plurality of permanent magnet segments consisting of a plurality of magnet pieces, the method comprising subsequent order steps of: inserting and axially stacking the plurality of magnet pieces in each of the bores of the rotor yoke, each of the plurality of magnet pieces having a coercive force at a surface and an interior, and the coercive force near the surface of each of the plurality of magnet pieces being higher than that in the interior of each of the plurality of magnet pieces, with each of the plurality of magnet pieces being kept separate from each other prior to a step of fixedly securing the axially stacked plurality of magnet pieces to each other inside each of the bores of the rotor yoke to form each of said plurality of permanent magnet segments.