Patent ID: 9413199
Filing Date: 2016-08-09
CPC Classification: H02K

Claim Text:
1. A rotor of an electric motor comprising a plurality of magnets arranged in a circumferential direction, the rotor further comprising a holding member provided concentrically with the rotor on a radially outside of the plurality of magnets so as to hold the plurality of magnets, the holding member including a plurality of tubular members arranged concentrically with one another and having diameters different from one another, the respective tubular members having expanded diameters such that compressive holding force acts on the magnets radially inwardly, as a result of elastic restorative force of the holding member, wherein any two tubular members of the plurality of tubular members which are adjacent to each other in a radial direction are configured such that one of the two tubular members has an interference larger than that of the other tubular member situated on a radially outside.