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A brush and inductor technology, applied in the field of winding diagram, can solve the problems of inconsistent brushes, brush wear, asymmetric contact behavior of commutators, etc., and achieve the effect of uniform wear

Inactive Publication Date: 2017-02-15
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inconsistent wear of the brushes thus occurs due to the arrangement of the brushes relative to the defined position of the current-carrying rotor coils
Especially the brushes that short-circuit the rotor coils around the rotor teeth aligned in series poles are thus subject to increased wear
[0008] Due to inconsistent wear, asymmetrical contact behavior can occur on the commutator, so that undesired force or noise stimuli can also occur

Method used

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Examples

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Embodiment Construction

[0034] figure 1 A schematic cross-sectional illustration of an electric motor 1 (electric machine) is shown, which has a pole piece 2 on which a plurality of stator poles are arranged. In the interior of the pole shoe 2 there is provided an indentation in which the rotor 6 is arranged rotatably on the shaft. The stator poles are arranged on the pole shoe 2 in such a way that they point in the direction of the indentation or in the direction of the rotor 6 .

[0035] The stator poles are designed as permanent magnet stator poles 4 and as series poles 5 without permanent magnets 3 . The pole piece 2 is preferably formed from a magnetically conductive material, so that the magnetic coupling (magnetic connection) between the permanent magnet stator pole 4 and the series pole 5 is formed via the pole piece 2 . However, the number N of stator poles 4, 5 is not limited to four, but the number of stator poles 4, 5 can be set to any even number.

[0036] The rotor 6 has a magnetical...

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Abstract

The invention relates to a brush-commutated electrical machine (1), comprising: a rotor (6) having a number of rotor teeth (8); rotor coils (10), which each enclose one or a plurality of the rotor teeth (8); a stator arrangement having stator poles, which have at least one permanent magnet stator pole (4) formed with a permanent magnet (3) and at least one subsequent pole (5) which is not provided with a permanent magnet and are arranged in a subsequent pole arrangement; a commutator having at least one brush pair in order to make contact with a rotor coil group of rotor coils which are connected to each other, wherein in each case the entire inductance of the connected rotor coils (10) is equal to one of the rotor coil group at a first and at a second position of the rotor (6) in relation to the stator arrangement.

Description

technical field [0001] The invention relates to a brush-commutated electric machine in which the stator has a series pole arrangement. In particular, the invention relates to a winding pattern for a rotor of such an electric machine. Background technique [0002] Brush-commutated DC motors are known in the prior art in a number of variants. In particular, internal rotor engines are used in various fields. [0003] Common variants of internal rotor direct-flow motors are known, for example, from documents US 4,372,035 and DE 10 2009 033 623 A1. These documents respectively show electric motors with a four-pole stator arrangement, in which the stator poles are connected by two permanent magnets (permanent magnets - stator poles) of the same polarity (permanent magnets - stator poles) opposite each other about the axis of rotation of the inner rotor and two In the pole device, the pole shoe (series pole) without permanent magnet is formed. A series pole arrangement of this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K23/38H02K23/30H02K23/04
CPCH02K23/30H02K23/04H02K23/38
Inventor G.罗斯
Owner ROBERT BOSCH GMBH