Axial gap rotating electrical machine

摘要

An axial-gap rotating electrical machine in which the distance of the air gap between a rotor and a stator can be accurately controlled is provided. A large diameter portion and a small diameter portion are formed on a rotating shaft and a stepped portion is formed therebetween. A rotor yoke is secured thereon and the position of the rotor is determined. The position of a bearing secured in a housing for rotatably supporting the rotating shaft is determined by a boss portion of the rotor yoke. The position of the housing is determined by the position of the bearing and the securing position of the stator is determined by a stepped portion formed on the inner circumference of the housing. Thus the position of the housing relative to the rotating shaft can be determined from the position of the rotor and the securing position of the stator can be determined.

主权项

1. An axial gap rotating electrical machine comprising:
a rotating shaft having a stepped portion between a large diameter portion and a small diameter portion; a rotor comprised of a rotor yoke secured on the small diameter portion of the rotating shaft in tight contact with the stepped portion and a permanent magnet secured on the inside surface of the rotor yoke; a first housing holding a first bearing positioned by a securing portion which is provided on the rotor yoke and secures the rotor yoke on the small diameter portion of the rotating shaft and rotatably supporting the rotating shaft; a stator positioned and secured by a stepped portion formed in the inner circumferential wall of the first housing so that the stator is opposed to the permanent magnet with a predetermined air gap in-between on the inner circumference of the first housing; and a second housing coupled with the housing and having therein a second bearing which rotatably supports the rotating shaft; wherein the securing portion provided in the rotor yoke is a one-sided boss portion or a double-sided boss portion; and wherein the boss portion provided in the rotor yoke positions the inner ring of the first bearing, and the outer ring of the first bearing is secured in the first housing.