Field structure of an electrical machine

Abstract

The invention describes a field structure of an electrical machine, which field structure comprises a plurality of field slots, wherein a field slot extends from a first surface of the field structure into the body of the field structure, and wherein a field slot comprises a T-shaped cross-sectional area dimensioned to accommodate a magnet pole assembly comprising a corresponding cross-sectional area. The invention further describes a magnet pole assembly comprising a pole piece attached to a carrier, wherein at least part of the carrier is wider than the pole piece, and wherein the carrier (comprises a T-shaped cross-sectional area dimensioned to fit into the T-shaped field slot of such a field structure. The invention also describes an electrical machine comprising an armature structure and such a field structure, and a plurality of such magnet pole assemblies arranged in the field slots of the field structure. The invention also describes a method of forming a T-shaped field slot in a field structure of an electrical machine.

Description

technical field [0001] The invention describes a field structure of an electrical machine, a pole assembly, an electrical machine and a method of forming T-shaped field slots in the field structure. Background technique [0002] Permanent magnets are commonly used in large electric machines such as electric motors or generators. Such an electric machine consists of two basic components, a field for generating magnetic flux and an armature for generating electromotive force and carrying current across the field. The armature usually consists of conductive coils wound on the stator and the field usually consists of magnets arranged on the rotor. The rotor can surround the stator and vice versa, with the magnets and coils facing each other across a narrow air gap. The established method of loading or mounting permanent magnets onto the field (or "field structure") of an electric machine involves steps such as enclosing the individual permanent magnet poles in a housing and gl...

AI Technical Summary

Problems solved by technology

This design therefore has several disadvantages, such as the need to attach a number of rather strong and thus heavy holders to the rotor surface, which increases the overall weight of the rotor

Additionally, the retainer needs to extend beyond the upper surface of the magnet to effectively hold the magnet in place, which may require a wide air gap

[0005] For the above reasons, prior art methods of mounting permanent magnets to the field of an electric motor are dangerous and difficult to perform, are problematic during repairs or involve costly machining steps

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