Axial gap type motor

Abstract

An axial gap type motor comprises a rotor rotatable about a rotating shaft, and a pair of stators arranged oppositely to hold the rotor inbetween from the opposite sides in the direction of rotational axis parallel with the rotating shaft of the rotor. The rotor has a plurality of main magnets arranged in the circumferential direction such that the direction of magnetic flux becomes parallel with the direction of rotational axis, a sub-permanent magnet arranged in the vicinity of the circumferential end of the main magnet and magnetized in the direction orthogonal to the direction of rotational axis and the radial direction, and a magnetic member arranged on at least any one surface on one side and the other side in the direction of rotational axis of the main magnet. Length of the magnetic member in the direction of rotational axis is longer than the length of the sub-permanent magnet in the direction of rotational axis.

Description

technical field [0001] This invention relates to axial gap type electric motors. [0002] This application claims priority based on patent application No. 2007-223058 filed on August 29, 2007, and its content is cited in this application. Background technique [0003] Conventionally, for example, there is known a permanent magnet synchronous machine that includes a pair of stators disposed opposite to each other across a rotor from both sides in the direction of the rotating shaft, and forms A magnetic flux loop passing through a pair of stators (for example, refer to Patent Document 1 and Patent Document 2). [0004] Patent Document 1: Japanese Patent Laying-Open No. 10-271784; [0005] Patent Document 2: Japanese Patent Laid-Open No. 2001-136721. [0006] In the permanent magnet synchronous machine related to the above-mentioned prior art, the permanent magnet synchronous machine provided with a rotor in which permanent magnets and magnetic materials magnetized only in ...

AI Technical Summary

Problems solved by technology

[0006] In the permanent magnet synchronous machine related to the above-mentioned prior art, the permanent magnet synchronous machine provided with a rotor in which permanent magnets and magnetic materials magnetized only in the same direction of the rotation axis direction are alternately arranged in the circumferential direction is different from, for example, a permanent magnet synchronous machine provided with Compared with a permanent magnet synchronous machine in which rotors with permanent magnets whose magnetization directions are reversed are alternately arranged, the following problems arise: the magnetic torque is halved, and the reluctance torque cannot be effectively used

[0007] In addition, in a permanent magnet synchronous machine including a rotor in which permanent magnets whose magnetization directions are reversed are alternately arranged in the circumferential direction and magnetic materials are arranged between adjacent magnets in the circumferential direction, due to the phase difference between the magnetic torque and the reluctance torque The phases are different, so there is a problem that the magnetic torque and the reluctance torque cannot be effectively used

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