Patent ID: 9003639
Filing Date: 2015-04-14
Classification: H02K,Y02T,Y10T

Abstract:
1. A method of manufacturing a rotor, the method comprising: fixedly attaching a rotor core to a rotational shaft, wherein said rotor core has a plurality of hole portions arranged in a circumferential direction, wherein each of said hole portions has only a single opening on a single axial end surface of said rotor core, and wherein each of said hole portions is not connected by a channel inside said rotor core to any other opening on said rotor core; inserting a magnet into each of said hole portions; and injecting a filling portion into each of said hole portions, wherein, for each hole portion, the filling portion is injected from the outside of said rotor through the opening directly into a portion defining a radially inner gap between the rotor and a central part of the larger dimension of the magnet, based on an axial cross section of the magnet, wherein said filling portion urges said magnet in a radial direction towards an outer circumference of said rotor core opposite to a position where said filling portion is injected such that an outward side surface of said magnet contacts said rotor core, and wherein said radially inner gap is narrower than a gap at a portion facing a corner of said magnet.