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Remanence tolerance compensation for electric machine

A technology of residual magnetism and compensating parts, applied in the field of motor, mover or stator, it can solve the problems of mass offset, rotor unbalance, changing rotor inertia moment, etc.

Inactive Publication Date: 2012-05-02
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of such conventional compensation solutions, in particular on the rotor, can lead to mass offsets in the mover, thereby changing the moment of inertia of the rotor and / or causing rotor unbalance

Method used

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  • Remanence tolerance compensation for electric machine
  • Remanence tolerance compensation for electric machine
  • Remanence tolerance compensation for electric machine

Examples

Experimental program
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Effect test

Embodiment Construction

[0026] The remanence fluctuations of the permanent magnets 10 within the same production batch are very small because all the permanent magnets 10 are produced for the same time and under consistent production conditions. However, between batches, the residual magnetism of the permanent magnet 10 may vary due to small differences in the mixture of permanent magnetic powders and small temperature differences in the furnace. Especially permanent magnets made of neodymium-iron-boron (NdFeB) typically have a tolerance of + / -3%. The magnetic current in a permanently excited electric machine 12 in the unsaturated state is directly proportional to the permanent magnet remanence.

[0027] figure 1 The relationship between the standard maximum magnetic current (ordinate) through the tooth 14 and the standard remanence (abscissa) of the permanent magnet 10 is shown. figure 2 The standard electromotive force versus rotor position (pole pitch) curves are shown for a standard remanence ...

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Abstract

The invention relates to a component (24) for an electric machine (12), in particular for a rotor (24) or stator, comprising at least one permanent magnet (10) for exciting the electric machine (12). The component (24) comprises a compensating part (18) for affecting a reluctance of a magnetic circuit running through the permanent magnet (10). The compensating part (18) is disposed asymmetrically or adjustably relative to the permanent magnet (10). In an alternative, the compensating part (18) is disposed asymmetrically or adjustably relative to the carrier (26) for the permanent magnet (10). In two different production methods, a compensating part (18) of the component is aligned relative to the permanent magnet (10) in order to compensate for a deviation of the actual remanence from a target remanence of the permanent magnet (10).

Description

technical field [0001] The invention relates to a first assembly for an electric machine, in particular for a mover or a stator, wherein the assembly comprises at least one permanent magnet for energizing the electric machine, wherein the assembly has a compensating element for influencing the magnetic field extending through the permanent magnet. The magnetic resistance of the circuit. Furthermore the invention relates to a second assembly for an electric machine, in particular for a mover or a stator, wherein the assembly comprises at least one permanent magnet for exciting the electric machine and a carrier for the permanent magnet; wherein said assembly has a compensating element for to affect the reluctance of a magnetic circuit extending through a permanent magnet. The invention also relates to electric machines. Furthermore, the invention relates to two production methods for electric machine components, in particular for a mover or a stator. Background technique ...

Claims

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Application Information

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IPC IPC(8): H02K1/27H02K1/17H02K15/03H02K21/02
CPCH02K1/17H02K15/03H02K1/278H02K21/028
Inventor S.A.埃文斯
Owner ROBERT BOSCH GMBH