WO2009071371A1 - Moteur électrique avec un boîtier de moteur - Google Patents

Moteur électrique avec un boîtier de moteur Download PDF

Info

Publication number
WO2009071371A1
WO2009071371A1 PCT/EP2008/063797 EP2008063797W WO2009071371A1 WO 2009071371 A1 WO2009071371 A1 WO 2009071371A1 EP 2008063797 W EP2008063797 W EP 2008063797W WO 2009071371 A1 WO2009071371 A1 WO 2009071371A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
motor
electric motor
shield
opening
Prior art date
Application number
PCT/EP2008/063797
Other languages
German (de)
English (en)
Inventor
Detlef Lauk
Paul Geubel
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2009071371A1 publication Critical patent/WO2009071371A1/fr

Links

Classifications

    • 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
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
    • H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel

Definitions

  • the invention relates to an electric motor with a motor housing made of a metallically conductive material which encloses the rotor, the stator and the commutator and which has an opening at least on one side.
  • Such electric motors are used as small motors according to the prior art for a variety of applications, such as actuators, as a wiper motor or for the drive of pumps.
  • the small motors used in the prior art have as DC or universal motors on a mechanical commutator, in which the armature windings of the rotor are connected via a plurality of electrodes alternately with the power supply.
  • the electrodes are arranged on the peripheral surface of a cylinder.
  • This cylinder is rotatably connected to the motor shaft.
  • the armature windings are in each case connected in the correct phase via a sliding contact, for example made of carbon, with the voltage source.
  • Electric motor to be radiated into the environment. This interference radiation can lead to the influence of other electrical and electronic systems in the vicinity of the electric motor.
  • plastic gearboxes are increasingly being used. These can be produced, for example, by injection molding.
  • a plastic housing can be made of fiber reinforced plastics.
  • the engine is often included in plastic gear housings in a cup-shaped metal housing. This has, on the side facing the gearbox housing, an opening through which the motor shaft emerges and engages with the gearbox located in the gearbox.
  • this design has the consequence that electromagnetic interference from the commutator can escape through the plastic housing unhindered. The protection of other modules from this interference is no longer guaranteed.
  • the present invention seeks to provide an electric motor which can be combined with metal or plastic gear housings and regardless of the gear housing used to protect other electrical components from electromagnetic interference.
  • an electric motor with a motor housing made of a metallically conductive material, which encloses the rotor, the stator and the commutator and which has at least one side an opening, wherein at least one shield is provided from a metallically conductive material, which in the area the opening is arranged.
  • the electric motor according to the present invention is a small electric motor with a power between about 1 watt and about 240 watts. This is usually equipped as a DC or universal motor with an electromechanical commutator.
  • the electric motor according to the present invention has a motor housing, which is generally cup-shaped.
  • the housing has a substantially cylindrical outer shape, wherein a bottom element for closing the housing is integrally connected to the lateral surface.
  • Such housings can be made of a metal or an alloy, for example. For example, production in a deep-drawing process is possible.
  • the cylindrical housing can also be formed from a pipe section. On this a floor panel can be fastened, for example by welding.
  • the housing may also consist of an electrically conductive plastic or of an insulator which is provided with a conductive coating.
  • the cylindrical outer shape of the housing is not limited to circular cylinders.
  • the cross section may take on almost any shape, e.g. also rectangular or an incomplete circular shape.
  • the housing may taper towards the ends or expand. The invention does not teach adherence to an exact cylinder shape as a solution principle.
  • the bottom plate is usually designed to receive a shaft bearing. This can be designed either as a rolling bearing or as a plain bearing.
  • the motor housing according to the invention contains the rotor, the surrounding stator and the commutator.
  • the bottom plate opposite opening can be closed in a particularly simple manner with a bearing plate made of plastic. This allows the pressing of a second shaft bearing for the rotor and the passage of the electrical contacts to the commutator.
  • the counter-bearing of the motor shaft and the rotor can also be arranged in the transmission housing.
  • An end shield can be omitted case by case.
  • a shield in the region of the opening of the housing, e.g. from a plate-shaped element.
  • the shield can surround the motor housing outside and thereby ensure a gap-free termination to the housing.
  • the shield can also be arranged inside the tubular motor housing, e.g. by clamping with resilient elements.
  • the shield can be fixed with the fastening elements of the motor housing on the gear housing or on the bearing plate. In particular screws and clamping elements come into consideration as a fastener.
  • the shield between the opening of the motor housing and the adjoining component is arranged. By optionally present conductive seals or spring elements a gap-free transition between the shield and the motor housing is ensured. Thus, the noise generated at the commutator can not escape from the housing.
  • the shielding according to the invention also comprises a metallically conductive material.
  • Either the shield is made of a metal or an alloy, it consists of a conductive glass or plastic or it is provided with a conductive coating.
  • Gaps between the shield and the motor housing or openings in one of the components affect the shielding tion, as long as the geometric dimensions of the openings are smaller than the wavelength of the electromagnetic interference generated in the commutator.
  • the effect of the shield results from the thickness and conductivity of the motor housing and the shield and is preferably more than 20 db, in particular more than 30 db.
  • the inventively proposed shielding between the motor housing and gearbox or end shield of the electric motor according to the present invention can be universally connected to any gear housing, including those made of simple, non-conductive or coated plastics.
  • the electromagnetic interference of the commutator is retained within the motor housing and can not interfere with other components.
  • minimization of electromagnetic interference radiation is desirable in order to ensure the reliability of such safety systems.
  • Figure 1 shows an electric motor according to the present invention, in which the shield according to the invention and the brush holder are not yet mounted.
  • Figure 2 shows a completed electric motor according to the present invention.
  • Figure 3 shows a section through an electric motor according to the present invention after it has been connected to a plastic gear housing.
  • Figure 1 shows an electric motor with a motor housing 1. This has a substantially cylindrical shape.
  • the cylinder shape according to the present example is not a circular cylinder. Rather, one side of the motor housing is flattened to facilitate installation in confined spaces.
  • the motor housing 1 has on one side a housing cover 8, which is integrally connected to the housing 1.
  • a housing cover 8 which is integrally connected to the housing 1.
  • the lid 8 can be welded to the lateral surface of the housing 1.
  • a sliding bearing 6 is pressed, which receives the motor shaft 3.
  • the stator 5 is arranged in the housing 1.
  • the stator has a magnetic field generating device, for example a plurality of permanent magnets.
  • the housing 1 has an opening 2 on the surface 8 opposite the base 8. Through this opening, the rotor and the stator can be inserted into the housing. In the region of the opening 2, the housing jacket surface has openings 7. These breakthroughs serve to attach a bearing plate o- a gear housing to the motor housing 1.
  • These components can be made of an elastic material, for example a plastic, and have corresponding projections 13. These projections 13 snap when pressed on the housing 1 in the recess 7 a.
  • Figure 2A shows the sectional view of Figure 1, after the missing components have been completed.
  • the commutator 4 is covered in Figure 2A by the brush holder 10.
  • This carries the brushes, for example made of carbon, which conduct the current via the commutator 4 to the coil 9.
  • the opening 2 is closed with a shield 11.
  • the shield 11 has projections 13 which engage in the recesses 7 of the housing 1. As a result, a simple assembly of the shield 11 by pressing is possible.
  • FIG. 2B again shows the closed motor with its outer housing 1 and the motor shaft 3. It can be seen that the shield 11 has a central opening which allows the free movement of the motor shaft 3. In order to keep the gap dimensions between the shield 11 and the motor shaft 3 small, an electrically conductive slip ring seal can be provided between the two components, for example of diamond-like carbon.
  • an electrically conductive sealant e.g. from a filled synthetic resin.
  • a filled synthetic resin e.g. from a filled synthetic resin.
  • the shield 11 has a collar 14 which rests against the upper edge of the housing 1 and thus forms a seal.
  • an electrical connector 12 is used for electrical contacting of the brush holder with the brushes arranged therein.
  • FIG. 3 shows the motor from FIG. 2 after connection to a gearbox housing 15.
  • the gearbox housing 15 can be manufactured in a particularly simple way from plastic, for example wise by injection molding. As a result, the plastic housing 15 does not provide any shielding of electromagnetic interference waves.
  • the housing 15 further includes a driven gear 17 and an upper shaft bearing 16.
  • the motor is inserted with its shaft 3 in the plastic housing so that the upper, formed as a screw part of the drive shaft 3 with gear 17 is engaged.
  • the shaft bearing 16 is then aligned with the lower, arranged in the housing base 8 shaft bearing 6 in alignment. This results in a stable mounting of the shaft 3, so that the rotor 9 does not abut the stator 5.
  • the plastic housing 15 also has protruding connecting cam 13, which in recesses 7 on the motor housing
  • the motor housing 1 and the gear housing 15 can be permanently connected to each other by simply plugging together.
  • the electrical shield 11 remains conductively connected to the housing 1.
  • the shield 11 ensures that the electromagnetic interference generated at the commutator 4 can not penetrate into the housing 15. This makes it irrelevant that such a disturbing wave could leave the housing 15. All interference is concentrated in the motor housing 1 and can leave this only with considerable attenuation.
  • the weakening of the interference radiation when passing through housing 1 and / or shield 11 is preferably more than 20 db, particularly preferably more than 30 db. Thus, a disturbing influence on other safety-related components of a vehicle or aircraft is reliably prevented.
  • the motor-gear unit shown in Figure 3 is particularly suitable for driving a windshield wiper, such as a rear window wiper.
  • the illustrated motor-gear unit can be used as a servomotor, e.g. for windows, sunroof adjusters or seat adjusters.

Landscapes

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

Abstract

Moteur électrique avec un boîtier de moteur en un matériau métallique conducteur, qui entoure le rotor, le stator et le collecteur et qui présente une ouverture au moins d'un côté. Selon l'invention, il est prévu au moins un blindage en un matériau métallique conducteur, qui est disposé dans la région de l'ouverture.
PCT/EP2008/063797 2007-12-03 2008-10-14 Moteur électrique avec un boîtier de moteur WO2009071371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007058089.6 2007-12-03
DE102007058089A DE102007058089A1 (de) 2007-12-03 2007-12-03 Elektromotor mit einem Motorgehäuse

Publications (1)

Publication Number Publication Date
WO2009071371A1 true WO2009071371A1 (fr) 2009-06-11

Family

ID=40430035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/063797 WO2009071371A1 (fr) 2007-12-03 2008-10-14 Moteur électrique avec un boîtier de moteur

Country Status (2)

Country Link
DE (1) DE102007058089A1 (fr)
WO (1) WO2009071371A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012069268A3 (fr) * 2010-11-26 2012-08-30 Robert Bosch Gmbh Dispositif de protection pour moteur électrique commuté par un balai et capteur de position doté d'un moteur électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010007342U1 (de) 2010-05-28 2011-10-20 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Elektromotor
DE102011013458A1 (de) 2011-03-09 2012-09-13 Valeo Systèmes d'Essuyage Scheibenwischerantrieb

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2092834A (en) * 1980-12-05 1982-08-18 Papst Motoren Gmbh & Co Kg Driving Mechanism for Magnetic Disc Drive Unit
GB2140218A (en) * 1983-05-20 1984-11-21 Rau Swf Autozubehoer Electric motor
GB2169149A (en) * 1982-07-27 1986-07-02 Papst Motoren Gmbh & Co Kg Drive motor unit for information-storage disk devices
US4661731A (en) * 1986-04-25 1987-04-28 Sperry Corporation Shield for fan motor for reducing structureborne noise and the external magnetic field
EP0726188A1 (fr) * 1995-02-08 1996-08-14 Valeo Systemes D'essuyage Motoréducteur, notamment pour l'entraînement d'un dispositif d'essuie-glace de véhicule
DE19652331C1 (de) * 1995-06-06 1998-05-14 Oriental Motor Co Vorrichtung zur magnetischen Abschirmung für einen Axiallüftermotor und Schutzvorrichtung für einen Axiallüftermotor mit magnetischer Abschirmung
JPH1141893A (ja) * 1997-07-18 1999-02-12 Mitsumi Electric Co Ltd 小型直流モータ及びその製造方法
JP2002218697A (ja) * 2001-01-22 2002-08-02 Nippon Soken Inc ブラシモータ
US20040012286A1 (en) * 2000-06-23 2004-01-22 Robert Zens Electromotor and driving axle with a built-in electromotor
JP2006166632A (ja) * 2004-12-08 2006-06-22 Canon Inc モータ
US20070216240A1 (en) * 2005-08-22 2007-09-20 Mitsubishi Electric Corporation Electric rotating machine
DE102007007248A1 (de) * 2007-02-14 2008-08-21 Wabco Gmbh Bürstenkommutierter Elektromotor

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2092834A (en) * 1980-12-05 1982-08-18 Papst Motoren Gmbh & Co Kg Driving Mechanism for Magnetic Disc Drive Unit
GB2169149A (en) * 1982-07-27 1986-07-02 Papst Motoren Gmbh & Co Kg Drive motor unit for information-storage disk devices
GB2140218A (en) * 1983-05-20 1984-11-21 Rau Swf Autozubehoer Electric motor
US4661731A (en) * 1986-04-25 1987-04-28 Sperry Corporation Shield for fan motor for reducing structureborne noise and the external magnetic field
EP0726188A1 (fr) * 1995-02-08 1996-08-14 Valeo Systemes D'essuyage Motoréducteur, notamment pour l'entraînement d'un dispositif d'essuie-glace de véhicule
DE19652331C1 (de) * 1995-06-06 1998-05-14 Oriental Motor Co Vorrichtung zur magnetischen Abschirmung für einen Axiallüftermotor und Schutzvorrichtung für einen Axiallüftermotor mit magnetischer Abschirmung
JPH1141893A (ja) * 1997-07-18 1999-02-12 Mitsumi Electric Co Ltd 小型直流モータ及びその製造方法
US20040012286A1 (en) * 2000-06-23 2004-01-22 Robert Zens Electromotor and driving axle with a built-in electromotor
JP2002218697A (ja) * 2001-01-22 2002-08-02 Nippon Soken Inc ブラシモータ
JP2006166632A (ja) * 2004-12-08 2006-06-22 Canon Inc モータ
US20070216240A1 (en) * 2005-08-22 2007-09-20 Mitsubishi Electric Corporation Electric rotating machine
DE102007007248A1 (de) * 2007-02-14 2008-08-21 Wabco Gmbh Bürstenkommutierter Elektromotor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012069268A3 (fr) * 2010-11-26 2012-08-30 Robert Bosch Gmbh Dispositif de protection pour moteur électrique commuté par un balai et capteur de position doté d'un moteur électrique
CN103210568A (zh) * 2010-11-26 2013-07-17 罗伯特·博世有限公司 用于电刷换向电动机的屏蔽结构和具有电动机的定位器
KR20140001918A (ko) * 2010-11-26 2014-01-07 로베르트 보쉬 게엠베하 브러시 정류식 전기 모터용 차폐 장치 및 전기 모터를 포함하는 위치 설정 부재
KR101930226B1 (ko) 2010-11-26 2019-03-11 로베르트 보쉬 게엠베하 브러시 정류식 전기 모터용 차폐 장치 및 전기 모터를 포함하는 위치 설정 부재

Also Published As

Publication number Publication date
DE102007058089A1 (de) 2009-06-04

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