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Rare earth element ring magnet with means for receiving foreign particles

A technology of ring magnets and utensils, applied in the direction of magnets, magnetic objects, electrical components, etc., can solve problems such as friction, noise, and deposition

Active Publication Date: 2018-08-07
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these ring magnets is that foreign particles, especially magnetic particles, can settle in the air gap between rotor and stator
Since the air gap is chosen to be as small as possible in order to achieve the highest possible machine performance, such foreign particles can lead to friction and thus to power losses and to noise in the operation of the electric machine

Method used

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  • Rare earth element ring magnet with means for receiving foreign particles
  • Rare earth element ring magnet with means for receiving foreign particles
  • Rare earth element ring magnet with means for receiving foreign particles

Examples

Experimental program
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Embodiment Construction

[0021] figure 1 The ring magnet 1 is hollow-cylindrical and extends concentrically around an axis 2 in an axial direction 21 . It has four magnetic poles N, S, between which a pole transition region 14 is formed in each case. The magnetic poles N, S are alternately magnetized opposite to each other, so that a magnetic north pole N alternates with a magnetic south pole S. They are arranged at equal distances from one another, so that the pole transition regions 14 are also equally spaced from one another.

[0022] The ring magnet 1 has a surface 12 defining it, wherein the surface 12 facing away from the axis is hereinafter referred to as the outer surface 121 and the surface 12 facing the axis is hereinafter referred to as the inner surface 120 .

[0023] Receptacles 11 are formed on inner surface 120 in pole transition region 14 , and are provided for receiving foreign particles (not shown). The device 11 thus forms a sink for foreign particles. Here, too, they are formed...

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Abstract

The invention relates to a ring magnet comprising at least partly a rare earth metal, having the shape of a hollow cylinder and extending in the axial direction, wherein it has an inner surface on which is arranged a Utensils with foreign particles. The invention also relates to a method for producing such a ring magnet.

Description

technical field [0001] The invention relates to a ring magnet extending in the axial direction, having a hollow-cylindrical design and at least partially comprising a rare-earth metal, as well as a method for producing the ring magnet. Background technique [0002] Electric machines are, for example, electric motors, starters, generators or auxiliary drives, such as adjusting drives for motor vehicles. In these electrical machines, it is known that the rotor or the stator is provided with permanent magnets for generating a permanent magnetic field. In the context of the ultra-miniaturization of the machines or in order to increase the output power of the machines, permanent magnets are often used which partially contain rare earth metals. [0003] For example, rotors and stators are known in which permanent magnets extend axially and radially in the rotor or stator and are magnetized tangentially, or in which permanent magnets are axially and tangentially in the rotor or st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/06H01F7/00
CPCH02K1/17H02K1/27H02K2213/06
Inventor W.布劳恩D.比耶卡西克R.格鲁普P.肖梅特S.里克辛格
Owner ROBERT BOSCH GMBH
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