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Layered Permanent Magnets with Conductive Cage Rotor Construction

A technology of permanent magnets and rotor poles, applied in the field of layered permanent magnets, can solve the problems of increasing converter loss, increasing current ripple and loss, etc.

Active Publication Date: 2020-05-22
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This reduction in transient reactance increases current ripple and losses in many PM machines and increases losses in converters

Method used

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  • Layered Permanent Magnets with Conductive Cage Rotor Construction
  • Layered Permanent Magnets with Conductive Cage Rotor Construction
  • Layered Permanent Magnets with Conductive Cage Rotor Construction

Examples

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Embodiment Construction

[0032] In accordance with the subject matter disclosed herein, systems, methods, and computer readable media for layered permanent magnets (PM) having a conductive cage rotor configuration are provided.

[0033] The subject matter described here combines two features that have not been seen together in PM machines before -- namely, that the PM rotor includes a higher intrinsic coercion in the periphery of the magnet body than in the core of the magnet body. Both permanent magnets and cages are coercive.

[0034] Reference will now be made in detail to the exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0035] Figure 2A and Figure 2B A plan view and an orthogonal view are respectively illustrated of an exemplary permanent magnet having a higher intrinsic coercivity in the periphery of the magnet bod...

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Abstract

Layered permanent magnet with conductive cage rotor construction is disclosed. According to one aspect, the subject matter described herein includes a rotor for an electrical machine. The rotor includes a rotor body having a central axis and including multiple permanent magnets positioned to create a plurality of rotor magnetic poles distributed around a peripheral surface of the rotor, and a cage that provides conductive loops around each of the rotor magnetic poles. Each permanent magnet has a magnet body having a center portion and a peripheral portion, the center portion comprising a material having higher remanence than the material comprising the peripheral portion and the peripheral portion comprising a material having a higher coercivity than the material comprising the center portion.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application Serial No. 62 / 004,859, filed May 29, 2014; the entire disclosure of which is incorporated herein by reference. technical field [0003] The topics described in this article relate to permanent magnet motors. More specifically, the subject matter described herein relates to layered permanent magnets with conductive cage rotor configurations. Background technique [0004] Brushless permanent magnet (PM) machines use a rotor embedded with permanent magnets arranged such that a plurality of poles protrude radially, axially or laterally from the rotor. The stator contains electromagnets that generate magnetic poles that move around the perimeter of the stator. Torque is generated by the attraction and repulsion of the moving poles produced by the current through the stator windings to the poles produced by the PM embedded within the rotor. [0005]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/46H02K1/02H02K1/22
CPCH02K1/02H02K1/223H02K21/46H02K2213/06H02K2213/09
Inventor D·D·特里梅林
Owner ABB (SCHWEIZ) AG
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