Nidec Corporation

Hideyuki Kinjo

Akira Ichien

Takayuki Migita

Hiroyuki Abe

A rotor includes a shaft, a rotor core, magnets on a radial outside surface of the rotor core, and sheet-shaped magnetic portions provided on radial outside surfaces of some of the magnets. The magnets include first magnets in which the magnetic portions are on a circumferential portion in a radial outside surface of the first magnets and second magnets in which the magnetic portions are not on a radial outside surface of the second magnets. The first magnets and the second magnets are alternately arranged in the circumferential direction in each of a first portion and a second portion along the axial direction in the radial outside surface of the rotor core. The first magnets of the first portion and the second magnets of the second portion overlap each other, and the second magnets of the first portion and the first magnets of the second portion overlap each other.

Rotor, motor, and electric power steering device

First and second sets of magnet assemblies and magnetic assemblies are alternately arranged in a circumferential direction in a first portion along an axial direction, and the first and second sets are alternately arranged in the circumferential direction in a second portion along the axial direction. When viewed in the axial direction, the first set of the first portion and the second set of the second portion overlap with each other, and the second set of the first portion and the first set of the second portion overlap with each other.

A rotor includes a rotor core having a cylindrical shape with a central axis as a center thereof and magnets arranged in a circumferential direction. The rotor core includes an inner side core portion positioned farther inward than the magnet in a radial direction, a first outer side core portion positioned farther outward than the magnet in the radial direction and disposed on a first side in an axial direction, and a second outer side core portion positioned farther outward than the magnet in the radial direction and disposed on a second other side in the axial direction. A distance between the central axis and an outer side surface of the first outer side core portion changes in the circumferential direction, a distance between the central axis and an outer side surface of the second outer side core portion changes in the circumferential direction. In a plan view, a first top portion positioned at an outermost position of the first outer side core portion in the radial direction and a second top portion positioned at an outermost position of the second outer side core portion in the radial direction are located at positions different from each other in the circumferential direction.

Growing community of inventors

Kyoto, Japan

Hideyuki Kinjo