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EP2118989A1 - Moteur electrique a commutation par balai - Google Patents

Moteur electrique a commutation par balai

Info

Publication number
EP2118989A1
EP2118989A1 EP08707428A EP08707428A EP2118989A1 EP 2118989 A1 EP2118989 A1 EP 2118989A1 EP 08707428 A EP08707428 A EP 08707428A EP 08707428 A EP08707428 A EP 08707428A EP 2118989 A1 EP2118989 A1 EP 2118989A1
Authority
EP
European Patent Office
Prior art keywords
motor
brush
commutator
electric motor
shield
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08707428A
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen FRANK
Nico Herzberg
Klaus-Werner Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF CV Systems Hannover GmbH
Original Assignee
Wabco GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wabco GmbH filed Critical Wabco GmbH
Publication of EP2118989A1 publication Critical patent/EP2118989A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/148—Slidably supported brushes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
    • H02K11/014—Shields associated with stationary parts, e.g. stator cores
    • H02K11/0141—Shields associated with casings, enclosures or brackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
    • H02K11/026—Suppressors associated with brushes, brush holders or their supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches

Definitions

  • the invention relates to electric motors, in particular brush-commutated electric motors.
  • Brush-commutated DC motors include, among other things, a stator and a rotor mounted on a motor shaft, which is moved within the stator by an alternating magnetic field. Such electric motors also have a Kommutatorvoriques, which consists of Kommutatorlamellen which are fixedly mounted on the motor shaft and brushes that stroke the commutator. The brushes are arranged on a so-called brush bridge, which is firmly connected to the motor housing. The brushes and the commutator bars interact with rotation of the motor axis such that a commutation or current application is achieved. The current application is necessary for the rotational movement of a DC electric motor. The frequency of the current application is proportional to the speed of the motor shaft and depends on the number of magnetic pole pairs.
  • Electric motors with brushes perform the electrical application mechanically via the commutator.
  • the brushes are pressed by springs on the concentric with the motor shaft commutator.
  • the externally supplied direct current for driving the motor flows through the brushes via the commutator of the commutator in the excitation windings of the rotor.
  • successive fins of the commutator are energized, so that the current in the excitation windings is cycled.
  • the disadvantage is that brush-commutated DC motors generate electromagnetic interference in the area of the brushes and commutator bars. These arise in particular during the transition of the brush between successive commutator segments. The disorders spread from the Bürsten, Commutator blades to the outside, so outside of the engine pot and generate an increased level of radio interference.
  • filter measures are included usually very high current carrying capacity needed. These include, for example, varistor disks mounted on the commutator, which pose risks for high performance classes in terms of fatigue life and process reliability. If these filter measures are implemented only with suppression capacitors and / or chokes in order to circumvent the problems associated with other electronic components, such as varistor disks, the desired degree of suppression of electromagnetic interference is not achieved.
  • the object of the present invention is to reduce electromagnetic interference of a brush-commutated electric motor without using or improving through-feed filters, varistor disks and suppressor capacitors.
  • an electric motor is provided with a commutator and corresponding Kommutator- brushes, a motor housing which surrounds the movable motor elements partially and a brush bridge, wherein a shield plate for electromagnetic shielding of the commutator and the commutator brushes is provided which motor outside to Brush bridge is arranged and covers the brush bridge separately and flat and with the motor housing has an electrically conductive connection.
  • the moving Components in particular the commutator and the commutator brushes surrounded by a closed conductive housing. Electromagnetic interference, which arise within the housing, can penetrate in this way only in a reduced form to the outside.
  • the shielding sheet is arranged between the brush system and the conductor or connecting elements which act as an antenna, whereby precisely the particularly critical electromagnetic disturbances of the brush bridge are prevented from propagating.
  • the shield plate has an electrical connection to the motor housing, so that a total, a closed, electrically conductive enclosure of the motor is given.
  • the shield closes the motor pot radially projecting from the motor axis or surrounding it to the outside of the motor. As a result, a shielding effect in the axial direction is advantageously achieved.
  • the shielding plate has on its circumference one or more spring segments, which are designed to effect a mechanically stable and electrically conductive contact with the motor housing or the end flange.
  • the peripheral areas of the shielding plate are reliably mechanically and electrically coupled to the rest of the motor housing.
  • so-called spring segments which can be configured in a wide variety of forms. It is crucial that the spring segments are designed such that they are put on the insertion of the shielding in the motor housing under tension so that they then press with a certain predefined pressure on the motor housing, thus ensuring the reliable mechanical-electrical connection.
  • the brush bridge of the motor is in a brush holder to the motor inside and a
  • Front part which contains further electrical interference suppression devices and Having means for motor outside providing electrical couplings, wherein advantageously the shield between the brush bridge and the front part is arranged.
  • the electromagnetic interference emanating from the brush bridge and the Kommutatorbürsten prevented from coupling to the motor outer side acting as an antenna guide elements and so to bridge the filtering measures.
  • the shield has a pre-embossed slug for connecting a Y-capacitor.
  • embodiments are also provided on the shield, which the connection of the typical interference suppression elements, such. Y capacitors, allow.
  • This allows in particular very advantageous arrangement of the shielding plate between the brush bridge and the other engine parts, in particular the aforementioned front part.
  • This advantageous aspect of the invention also relates to the fact that the shielding plate can have openings for the passage of the throttle connections.
  • Fig. 4 is a sectional view of an embodiment of the present invention.
  • FIG. 5 is another perspective view of an embodiment of the present invention.
  • Fig. 1 (a) shows a schematic representation of the operation of the present invention. Accordingly, an electromagnetic interference is generated in the electric motor M at the commutator, which is indicated by the wavy arrows. These propagate via the interference suppression elements, which are shown here in simplified form as coils L and a capacitor C. In addition, as a result of the high-frequency components of the electromagnetic interference, faults on the interference suppression components L and C pass to the electrical lines outside the electrical components L and C.
  • FIG. 1 (b) now shows the arrangement with the shielding panel according to the invention in a diagrammatic representation.
  • Fig. 2 shows an exploded view of an electric motor, which is designed according to the present invention.
  • the motor housing 1 consists in the present case of a motor pot, which is open to one side. From there, the stator 2, the anchor package 3, which is located on the rotor shaft 11, including the commutator 4 are introduced into the motor pot 1. On the inside, the motor shaft is mounted in a bearing 9. From the opposite side closes the brush bridge 5, on the motor inside of the brush holder 23 is disposed from the engine pot.
  • the bearing 8 represents the front-side support for the motor shaft 11.
  • the current is supplied via the four reactors 7 via the conductors 10 to the brush arrangements 6.
  • four brush arrangements 6 are provided. These lie on the commutator bars 12 of the commutator 4 and allow the changing polarization, which allow the operation of an electric motor according to the embodiment shown here.
  • Fig. 3 shows the brush bridge 5 of the present invention again in an enlarged view.
  • the brush bridge 5 consists of a Front part 22, on which conductor elements 26 and 27 and Y-capacitors 28 are arranged.
  • the shielding plate 21 next to the motor inside, ie in the direction of the pot 1 of the motor, the shielding plate 21 according to the invention is arranged. This has spring segments 24 on the outer circumference and openings 25 for performing throttle connections.
  • the brush holder 23 is arranged, on which, as can be seen from Fig. 1, the throttles and brushes are arranged.
  • sectional view brush assembly 6 which includes a brush 32.
  • the brush 32 is pressed by the spring 33 onto the commutator bars 12 of the commutator 4.
  • the brush 32 is in electrical contact with the throttle 7 by means of the electrical conductor 10.
  • the throttle 7 is coupled to a conductor element 26 through an opening 25.
  • the conductor element 26 is located on the side facing away from the motor.
  • the opening 25 is not only provided in the brush bridge 23, but also in the shield plate 21 according to the invention.
  • the shielding plate 21 is according to this advantageous embodiment in close contact with the brush bridge and the front part 22.
  • the motor shaft 11 is indicated, on which the commutator is superimposed, and the bearing 8 in cross section and a connecting cable 29 and a Y-capacitor 28th
  • FIG. 5 shows a further perspective view of the front part 22, on which the conductor elements 27 and 26 and the Y capacitors 28 are arranged.
  • An essential effect of the shielding plate 21 according to the invention, whose spring segments 24 are indicated below the front part 22, is to protect the conductor elements 26 and 27 from coupling in of the electromagnetic interference caused by the brushes.
  • the brackets 41 for the brushes are also seen in Fig. 5 through the opening for the motor axis.
  • Fig. 6 shows a simplified sectional view through an arrangement according to another embodiment of the present invention.
  • the motor is designed with an anchor group 3 within the stator 2, wherein the armature group 3 is superimposed on the shaft 11.
  • the commutator shafts 12 are also applied.
  • the shaft is mounted in the bearing 9.
  • the shielding plate 21 according to the invention is attachable to the brush holder 23, so that when assembling the housing 1 and the end flange 34, the shield 21 is inserted between the brush holder 23 and the front part 22.
  • the brush assembly 6 with brush 32, supply cables 10 and throttle 7 are shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc Machiner (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention concerne un moteur électrique comprenant un commutateur et un balai commutateur (32) correspondant, un carter de moteur (1 ) qui entoure partiellement des éléments moteur mobiles, et un porte-balai (5), caractérisé en ce qu'une tôle de blindage (21 ) pour la protection électromagnétique du commutateur et du balai commutateur (32) est disposée côté extérieur du moteur en direction du porte-balai (5), recouvre sensiblement entièrement de manière séparée et plane le porte-balai et est en liaison électroconductrice avec le carter de moteur.
EP08707428A 2007-02-14 2008-01-31 Moteur electrique a commutation par balai Withdrawn EP2118989A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007007248A DE102007007248A1 (de) 2007-02-14 2007-02-14 Bürstenkommutierter Elektromotor
PCT/EP2008/000737 WO2008098681A1 (fr) 2007-02-14 2008-01-31 Moteur électrique à commutation par balai

Publications (1)

Publication Number Publication Date
EP2118989A1 true EP2118989A1 (fr) 2009-11-18

Family

ID=39415410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08707428A Withdrawn EP2118989A1 (fr) 2007-02-14 2008-01-31 Moteur electrique a commutation par balai

Country Status (4)

Country Link
EP (1) EP2118989A1 (fr)
CN (1) CN101589536B (fr)
DE (1) DE102007007248A1 (fr)
WO (1) WO2008098681A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007058089A1 (de) * 2007-12-03 2009-06-04 Robert Bosch Gmbh Elektromotor mit einem Motorgehäuse
JP5634109B2 (ja) * 2010-04-27 2014-12-03 株式会社ミツバ 減速機付モータ、およびサンルーフ駆動装置
DE102010028299A1 (de) * 2010-04-28 2011-11-03 Robert Bosch Gmbh Handgeführtes Elektrowerkzeug
DE102010062034A1 (de) * 2010-11-26 2012-05-31 Robert Bosch Gmbh Schirmungsanordnung für einen bürstenkommutierten Elektromotor sowie Stellgeber mit einem Elektromotor
DE102012102811A1 (de) * 2012-03-30 2013-10-02 Valeo Wischersysteme Gmbh Scheibenwischermotor und Entstörbaugruppe für einen Scheibenwischermotor
CN103633782B (zh) * 2012-08-20 2017-09-01 德昌电机(深圳)有限公司 电机及其端盖组件
DE102016222572A1 (de) * 2016-08-23 2018-03-01 Robert Bosch Gmbh Elektromotor, insbesondere für eine Getriebeantriebseinrichtung eines Komfortantriebs in einem Kraftfahrzeug
CN208046361U (zh) * 2018-04-25 2018-11-02 广东肇庆爱龙威机电有限公司 用于直流有刷电机的端盖和包括该端盖的直流有刷电机
TWI796781B (zh) * 2021-09-08 2023-03-21 國立高雄師範大學 具有抑制電磁干擾之放電單元的直流電動機

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905580U (de) * 1964-07-24 1964-12-03 Loewe Opta Ag Stoerschutzvorrichtung fuer elektromotoren.
JPS60106344A (ja) * 1983-11-11 1985-06-11 Mabuchi Motor Co Ltd 小型モ−タ
DE4132813C1 (en) * 1991-10-02 1993-02-25 Pierburg Gmbh, 4040 Neuss, De Electrically powered fuel pump for motor vehicle - suppresses radio interference by having two radio interference by having two capacitors in series for projecting terminal pins
DE19705833A1 (de) * 1997-02-15 1998-08-20 Itt Mfg Enterprises Inc Bürstenhalteanordnung
US6078117A (en) * 1997-08-27 2000-06-20 Nartron Corporation End cap assembly and electrical motor utilizing same
DE19804369C2 (de) * 1998-02-04 2000-02-17 Bosch Gmbh Robert Kollektormotor
US6400058B1 (en) * 2000-08-01 2002-06-04 Primax Electronics Ltd. Universal motor with reduced EMI characteristics
DE102004003419A1 (de) * 2004-01-23 2005-08-11 Robert Bosch Gmbh Entstörvorrichtung
JP4894331B2 (ja) * 2005-04-11 2012-03-14 日本電産株式会社 ブラシレスモータ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008098681A1 *

Also Published As

Publication number Publication date
DE102007007248A1 (de) 2008-08-21
CN101589536B (zh) 2012-08-15
WO2008098681A1 (fr) 2008-08-21
CN101589536A (zh) 2009-11-25

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