Permanent magnet rotor with flux concentrating pole pieces

A technology of permanent magnets and rotors, applied in the direction of magnetic circuit rotating parts, magnetic circuits, magnetic circuit shape/style/structure, etc., can solve the problems of increasing rotor weight and inertia moment, etc., to improve performance, reduce costs, and reduce production cost effect
CN101978579AInactive Publication Date: 2011-02-16HOGANAS AB
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HOGANAS AB
Publication Date
2011-02-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a permanent magnet machine comprising a stator (301) and a rotor (305), the rotor (305) being adapted to rotate relative to the stator (301), the rotor (305) comprising a plurality of permanent magnets (307) separated in the circumferential direction from each other by axial Iy extending rotor pole pieces (309) for concentrating the magnetic flux from said permanent magnets (307), the stator (301) having a structure that defines axial limits of an air gap between the stator (301) and the rotor (305) for communicating magnetic flux between the stator (301) and the rotor (305), characterized in that at least some of the permanent magnets (307) extend axially outside the axial limits of the air gap as defined by the stator structure.
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Description

technical field

[0001] The invention relates to the field of permanent magnet motors, in particular to a DC brushless permanent magnet motor. Background technique

[0002] Permanent magnet motors, especially DC brushless permanent magnet motors, can be realized as electrically modulated pole motors. In recent years, motor designs gradually developed from modulated pole motors, claw pole motors, Lundell motors and transverse field motors (TFM) have attracted more and more attention. As early as about 1910, Alexandersson and Fessenden proposed a motor using the above motor principle. One of the most important reasons for this growing interest is that the design enables extremely high torque outputs compared to, for example, induction motors, switched reluctance motors, or even permanent magnet brushless motors. In addition, the advantage of this type of motor is that its coils are usually easy to manufacture. Examples of implementations of modulated pole motor topologies in...

Claims

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