Rotor for electric motor

A rotor for an electric motor, the rotor extending in a direction of a central axis of rotation of the electric motor and being rotatably supported about the central axis of rotation, the rotor comprising:

• a plurality of permanent magnets arranged in an outer peripheral portion of the rotor in such a manner that N-poles and S-poles are alternately located in a circumferential direction of the rotor, the N-poles and the S-poles being magnetic poles extending parallel to the direction of the central axis of rotation;
• an outer peripheral core located so as to face intermediate portions of outer peripheral surfaces of the permanent magnets, the intermediate portions being the outer peripheral surfaces of the permanent magnets excluding both end portions in the direction of the central axis of rotation;
• a pair of terminal cores, the terminal cores each being located at a corresponding one of ends of the rotor in the direction of the central axis of rotation, wherein the outer peripheral core and the terminal cores are made of a magnetic material, and maximum magnetic permeability of the terminal cores is equal to or less than maximum magnetic permeability of the outer peripheral core;
• and
• a central core extending in the direction of the central axis of rotation and rotatably supported about the central axis of rotation, wherein:
• the central core, the outer peripheral core and the terminal cores are formed as separate components;
• the plurality of permanent magnets is arranged on an outermost peripheral surface of the central core;
• and
• the pair of terminal cores includes a first terminal core and a second terminal core that are each arranged at a corresponding one of ends of the central core in the direction of the central axis of rotation and the central core extends from the first terminal core to the second terminal core.