Permanent magnet rotor assembly provided with welded magnet retaining elements

Abstract

The present disclosure is concerned with a permanent magnet rotor for an electric machine provided with an internal stator and a coaxial external rotor. To overcome the drawbacks associated with the use of an adhesive to mount the permanent magnets to the rotor body, permanent magnet retaining elements are mounted to the inner surface of the rotor, between adjacent magnets.

Description

technical field [0001] The present invention relates to permanent magnet electric machines. More specifically, the present invention relates to permanent magnet rotor assemblies including magnet retaining elements welded to the rotor. Background technique [0002] Permanent magnet motors are well known in the art. They usually have a stator and a rotor mounted coaxially to the stator for rotation around the stator. [0003] Some permanent magnet motors have an inner stator and an outer rotor, the rotor roughly enclosing the stator. As in the present case, the rotor has a generally cylindrical body and permanent magnets are positioned on the inner surface of the rotor. To properly mount the permanent magnets to the interior surface of the barrel rotor body, adhesives are conventionally used to prevent relative movement of adjacent permanent magnets. [0004] The use of adhesives between the permanent magnets and the cylindrical rotor body has a number of drawbacks. First...

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Problems solved by technology

Second, the costs associated with using adhesives are quite high when adding the price of the adhesive, labor costs, tooling costs and part cleaning costs

In practice, for the adhesive to work properly, the mating surfaces of the permanent magnets and the cylindrical body are usually properly prepared and cleaned before the adhesive is applied, which is time consuming and adds to the manufacturing cost of the rotor

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