Patent ID: 11888368
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 11:
12. A rotor having 2n (n is a natural number) magnetic poles, comprising:
at least one first permanent magnet forming part of an outer peripheral surface of the rotor and magnetized to have polar anisotropy;
at least one second permanent magnet that is a different type from the at least one first permanent magnet, is adjacent to the at least one first permanent magnet in a circumferential direction of the rotor, has lower magnetic force than magnetic force of the at least one first permanent magnet, and is magnetized to have polar anisotropy;
at least one third permanent magnet forming part of the outer peripheral surface of the rotor and magnetized to have polar anisotropy; and
at least one fourth permanent magnet that is a different type from the at least one third permanent magnet, is adjacent to the at least one third permanent magnet in the circumferential direction, has lower magnetic force than magnetic force of the at least one third permanent magnet, and is magnetized to have polar anisotropy, wherein
the at least one second permanent magnet is a single integral ring-shaped magnet,
the at least one first permanent magnet includes a first ring-shaped portion covering an end portion of the second permanent magnet in an axial direction of the rotor,
the at least one third permanent magnet includes a second ring-shaped portion covering an end portion of the fourth permanent magnet in the axial direction of the rotor, and
in the axial direction of the rotor, the first ring-shaped portion faces the second ring-shaped portion.