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WO2009000291A1 - Dispositif pour supprimer le bruit d'un petit moteur - Google Patents

Dispositif pour supprimer le bruit d'un petit moteur Download PDF

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Publication number
WO2009000291A1
WO2009000291A1 PCT/EP2007/005587 EP2007005587W WO2009000291A1 WO 2009000291 A1 WO2009000291 A1 WO 2009000291A1 EP 2007005587 W EP2007005587 W EP 2007005587W WO 2009000291 A1 WO2009000291 A1 WO 2009000291A1
Authority
WO
WIPO (PCT)
Prior art keywords
disk
electrode
connector
brush
shaped element
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.)
Ceased
Application number
PCT/EP2007/005587
Other languages
English (en)
Inventor
Jochen Langguth
Kathrin Langguth.
Andreas Wilk
Valerij Korsuchin
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.)
Sintertechnik GmbH
Original Assignee
Sintertechnik 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 Sintertechnik GmbH filed Critical Sintertechnik GmbH
Priority to PCT/EP2007/005587 priority Critical patent/WO2009000291A1/fr
Priority to PCT/EP2008/005097 priority patent/WO2009000501A1/fr
Publication of WO2009000291A1 publication Critical patent/WO2009000291A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H02K11/02—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

Definitions

  • the invention relates to a device in accordance with the preamble of claim 1.
  • Such a device is known from U.S. Patent 7,019,425 B2.
  • a bar core inductivity being installed between each of the first electrodes of a C x capacitor and a connection clamp which is provided to be connected with a power source.
  • a good electromagnetic noise or noise suppression respectively, for small electric motors.
  • Such electric motors may be in particular part of actuators used in vehicles, aircraft and the like.
  • tightened up regulations regarding the maximum tolerable noise make it necessary to further improve the noise suppression of small electric motors.
  • a first coil having a predetermined inductivity is connected with its first connector with the first electrode of a C x capacitor and its second connector with a first brush, wherein the first coil is provided on a first supporting element, and wherein the first supporting element is mounted on the sur- face of the disk-shaped element.
  • the proposed indue- tivity is provided on a first supporting element which may be mounted on an upper or lower surface of the disk-element.
  • a second coil having the predetermined inductivity which is connected with its third connector with the second electrode of the C x capacitor and its fourth connector with a second brush, wherein the second coil is provided on a second supporting element, and wherein the second supporting element is mounted on the surface of the disk-shaped element.
  • the first and/or the second mounting element/s is/are made from plastic.
  • Said mounting elements can be produced very cheaply.
  • Said plastic may be filled with a predetermined amount of a powder which improves the inductivity of the coil.
  • Said powder may contain one or more materials selected from the following group: MeOFe 2 O 3 , MeFe 2 O 4 , wherein Me is one of the following ions: Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Zn 2+ , Mg 2+ , Cu 2+ or mixtures thereof; Fe-; Co-; Ni- and rare earth powders.
  • each electric motor has a different noise characteristic.
  • the noise characteristic may be determined by setting the material used for filling the plastic in an appropriate way so that a maximum suppression of the noise is achieved.
  • the material used for producing the supporting element and the coil taken up on the supporting element is chosen such that the noise characteristic of the electric motor is suppressed most effectively.
  • first and the second supporting elements are formed in one part.
  • the part comprising both supporting elements can for example be made by injection molding or the like.
  • the first brush is provided on one end of a brush arm, the other end of which is fixed at the first supporting element, and for wherein the second brush is provided on one end of a second brush arm, the other end of which is fixed at the second supporting element.
  • the supporting elements have not only the function to take up the coil but also to hold a, preferably flexible, brush arm at which the brush is mounted.
  • a brush arm may be produced of a flexible metal strip in order to press the brush on a contact surface of a commutator.
  • the first brush is connected with the second connector via the first brush arm, and/or the second brush is connected with the fourth connector via second brush arm. This can easily be achieved when using as brush arms a metal with an electric conductivity.
  • connection between the first connector and the one first electrode and the connection between the third connector and/or the second electrode are advantageously made by clamping, soldering, welding, or by means of an electrical conduc- tive polymer.
  • a connection via clamping allows a very easy mounting of the brush arm at the supporting element .
  • the first connector may be connected with the first electrode by means of a first terminal being provided to be connected with a first power source, and/or the third connector may be connected with the second electrode by means of a second terminal being provided to be connected with the power source.
  • the disk-shaped element may be designed as a ceramic multilayer element.
  • a suitable disk-shaped ceramic multi-layer element is for example described in U.S. Patent 7,019,425 B2. The disclosure regarding the structure, material, design etc. of the disk-shaped ceramic multi-layer element contained therein is herewith incorporated by reference.
  • the disk-shaped element may also be designed as a ceramic barrier-layer element.
  • a suitable disk-shaped ceramic barrier-layer element is for example described in U.S. Patent 7,019,425 B2. The disclosure regarding the structure, material, design etc. of the disk- shaped ceramic barrier-layer element described therein is incorporated herewith by reference.
  • first and the second electrode of the C x capacitor are provided on an upper surface of the disk- shaped element.
  • first and the second electrode may have any suitable, preferably symmetrical, shape.
  • first and the second electrode cover an essential part of the upper surface .
  • a first isolation path electrically separates the first and the second elec- trodes, and second isolation paths electrically separate the third electrode from the first and the second electrodes.
  • the first and the second isolation paths may have the form of a "Y" or the like.
  • the first and the second supporting elements may at least partially cover the first and the second electrodes. It has been observed that in this arrangement first and second in- ductivities are not negatively affected by the electrodes.
  • a first discrete capacitor being mounted on the disk- shaped element is switched between the first and the second electrodes. I. e. the first discrete capacitor is connected in parallel with the C x capacitor.
  • a second discrete capacitor being mounted on the disk-shaped element may be switched between the third electrode and at least one of the first and the second electrodes. Also, the second discrete capacitor is connected in parallel with the C y capacitor.
  • first and/or second discrete capacitor/s is/are SMD element/s.
  • Such elements are available commercially at a low price. A mounting of such elements on the surface of the disk-shaped element is easy. The coefficients of expansion of the discrete capacitor and the disk- shaped element are very similar so that a damage of the discrete capacitors due to thermal effects is highly unlikely.
  • the first electrodes are connected with a resistor having a resistance in the range of 10 ⁇ to 100 k ⁇ .
  • the first and second electrodes may be connected with NTC-resistor or a VDR-device.
  • the resistor may be produced by printing technique, e. g. screen-printing.
  • the disk-shaped element may have a central breakthrough for feeding through a shaft.
  • the proposed device may be combined with an end cap for a small electric motor and may be mounted therein.
  • the disk-shaped element covers an inner end face of the end cap.
  • the disk-shaped element fully covers the inner end face.
  • the end cap is shielded against a ra- diation of electromagnetic noise or noise, respectively, from the interior of a housing surrounding the electric motor.
  • a small electric motor comprising a housing which is closed with the aforementioned end cap.
  • Fig. 1 a plan view of a disk-shaped element
  • Fig. 2A a sectional view of a first device
  • Fig. 2B a sectional view of a first device with a feed- through capacitor
  • Fig. 3 a plan view of a mounting element
  • Fig. 4 a sectional view of a second device
  • Fig. 5 a perspective view of an end cap comprising a third device
  • Fig. 6 a substitute circuit diagram
  • Fig. 7 a plot of the conducted emissions in dependency of the frequency of a conventional electric motor and an electric motor provided with a device according to the invention.
  • Fig. 1 shows a plan view of a disk-shaped element 1 in which a C x capacitor and two C y capacitors are combined.
  • the disk- shaped element 1 of Fig. 1 is designed as a ceramic barrier layer element.
  • the disk-shaped element 1 comprises a disk which is produced of a dielectric ceramic, e.g. strontium ti- tanate, barium titanate, calcium titanate or mixtures thereof having a VDR characteristic, NDK mass (COG) and similar, mi- crowave ceramic and similar.
  • a first electrode 2 On an upper surface of the disk there is provided a first electrode 2, a second electrode 3 and a third electrode 4.
  • the third electrode 4 is connected with ground, e. g. with a housing of the electric motor.
  • the electrodes 2, 3, 4 may be made from a silver or copper layer or any other suitable electrically conductive material. Such electrodes 2, 3, 4 may be manufactured by burning in pasteous systems.
  • Reference sign 5 designates a central breakthrough.
  • the first 2 and the second electrode 3 are separated by a first isolation path 6.
  • the third electrode 4 is separated from the first electrode 2 and the second electrode 3 by second isolation paths 7.
  • the first 2 and the second electrode 3 form in the shown arrangement a C x capacitor.
  • the first 2 and the third electrode 4 form a C y capacitor, and the second 3 and the third electrode 4 form a further C y capacitor.
  • a capacity of the C x capacitor may be increased by providing a first SMD capacitor 8 which is switched between the first 2 and the second electrode 3.
  • second SMD capacitors 9 may be switched between the first electrode 2 and the third electrode 4 and between the second electrode 3 and the third electrode 4 in order to increase the capacity of the C y ca- pacitors.
  • the SMD capacitors 8, 9 there may be provided further elements like resistors, varistors, NTC- resistors, VDR-devices, diodes and the like in order to set or adapt the electric properties of the disk-shaped element 1 with respect to the respective noise suppression require- ments.
  • Fig. 2A shows a sectional view through a first device.
  • the first electrode 2 extends from an upper surface around an outer circumference to a lower surface of the disk-shaped element 1.
  • a first supporting element 10 is fixed by a first clamp 11 on the upper surface of the disk-shaped element 1.
  • the first clamp 11 comprises at its first end El a hook 12 which forms a first terminal to be contacted with a power source (not shown here) .
  • the first clamp 11 may be casted into the first supporting element 10 so that its second end E2 is accessible for connecting it with a first connector 13 of a first coil 14.
  • the first coil 14 is wound on the first supporting element 10.
  • a second connector 15 of the first coil 14 is contacted with a first brush arm 16.
  • the first brush arm 16 is made from a flexible electrically conductive metal strip.
  • the first brush arm 16 is provided at its free end (not shown here) with a first brush.
  • the first connector 13 may be electrically connected with the second end E2 of the first clamp 11 by clamping, soldering or the like.
  • the second connector 15 may be electrically connected with the first brush arm 16 by clamping, soldering or the like.
  • the first supporting element 10 is made preferably by a poly- mer.
  • Said polymer may be a conventional plastic material or resin which may be formed for example by injection molding.
  • the inductivity of the first coil 14 may be set by manufacturing the first supporting element 10 from a polymer which contains one or more materials selected from the following group: MeOFe 2 O 3 , MeFe 2 O 4 , wherein Me is one of the following ions: Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Zn 2+ , Mg 2+ , Cu 2+ or mixtures thereof; Fe-; Co-; Ni- and rare earth powders.
  • the inductivity of the first supporting element 10 being combined with the first coil 14 may be set by a composition of the afore- mentioned material.
  • Fig. 2B shows a sectional view through the first device realizing a feedthrough capacitor. From the supporting element 10 there extends through a breakthrough provided in the disk- shaped element 1 a connection pin 11a the first end El of which is in the form of a hook 12.
  • the connection pin 11a may be fixed at the first electrode 2, e. g. by soldering or the like.
  • a first brush being mounted at first brush arm 16 is designated with the reference sign 24.
  • the second electrode 3 is provided with a similar or identical arrangement shown in Fig. 2A or 2B.
  • Fig. 3 shows a plan view of an embodiment of a supporting arrangement.
  • the supporting arrangement comprises here a first 10 and a second supporting element 17 which are connected by a bridge element 18.
  • the first supporting element 10, the bridge element 18 and the second supporting element 17 are preferably cast or injection moulded in one part.
  • the supporting elements 10, 17 are structured in a similar way as shown in Fig. 2.
  • Each supporting element 10, 17 comprises a coil 14, 19 which is wound around the supporting element 10, 17.
  • a third connector 20 of the second coil 19 extends around the outer circumference of the disk-shaped element 1 to the lower surface thereof.
  • a fourth connector 21 of the second coil 19 is electrically connected with a second brush arm 22.
  • the second brush arm 22 is provided with a second brush 23.
  • Reference sign 24 designates the first brush being fixed at a free end of the first brush arm 16.
  • Fig. 4 shows the supporting arrangement of Fig. 3 being mounted on the disk-shaped element 1.
  • Fig. 4 there is provided a second clamp 25 by means of which the second supporting element 17 is fixed on the upper surface of the disk-shaped element 1 and by which at the same time the first end El of the third connector 20 is pressed against the second electrode 3 which extends from the upper surface circumference to the lower surface of the disk-shaped element 1.
  • the first supporting element 10 is fixed and contacted with the first electrode 2 (not shown here) .
  • Fig. 5 shows an end cap 26 for a small electric motor (not shown here) .
  • a further device of the invention within the end cap 26 there is mounted a further device of the invention.
  • the device again comprises a disk- shaped element 1 having a central breakthrough 5.
  • the disk- shaped element 1 fits essentially with the form of a inner end face 27 which is surrounded by side walls 28 of the end cap 26.
  • a shaft 29 extends through the central breakthrough
  • a further supporting assembly is similar to the supporting assembly shown in Fig. 3. It comprises a first 10 and a second sup- porting element 17 which are formed together in one part.
  • Each supporting element 10, 17 comprises here a cylindrical extension 31 around which there is wound the first 14 and second coil 19, respectively (not shown here) .
  • the brush arms 16 and 22 do not extend from the, preferably cylindrical formed, extensions 31 supporting the coils 14, 19, but from the bridge member 18 which connects the first supporting element 10 with the second supporting element 17.
  • the further supporting assembly is in engagement with an opening 32 provided within the side walls 28 of the end cap 26. Opposite to the opening 32 there may be provided at least one further breakthrough within the side wall 28. Such a fur- ther breakthrough (not shown here) may be formed in form of a slit.
  • the further breakthrough is formed such that by means of a tool the flexible brush arms 16, 22 may be held apart of each other from the exterior of the end cap 26 when mounting the end cap 26 at a housing of a small electric motor comprising a shaft 29 with a commutator. Upon removal of such a tool the brushes 23, 24 are pressed against the surface of a commutator by the flexible brush arms 16, 22.
  • the disk-shaped element 1 essentially covers the inner end face 27. This has a shielding effect by which an escape of electromagnetic noise in the surrounding of a housing of a small electric motor being closed with the end cap 26 can be counteracted.
  • Fig. 6 shows a substitute circuit diagram of a circuit for noise suppression of a small electric motor.
  • a C x capacitor is installed between connection clamps Al, A2 which are used for the connection to a power source. Further, each electrode of the C x capacitor is connected via an inductivity Ll, L2 with a first brush Bl and a second brush B2 by which a sliding contact to a commutator is realized.
  • a varistor V may be installed. Instead or in addi- tion to the varistor V, an ohmic resistor can also be provided.
  • Each of the connection clamps Al, A2 as well as each of the inductivities Ll, L2 are also connected via a C y capacitor with ground.
  • C D designates a feedthrough capacitor which may be provided additionally (see Fig. 2B) .
  • Fig. 7 shows a plot of the conducted noise in dependency of the frequency of a conventional electric motor and the same electric motor being provided with a device for noise suppression in accordance with the invention.
  • the conducted emissions or noise i.e. the emissions which are emitted for example via wire, can be reduced remarkably.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc Machiner (AREA)

Abstract

L'invention concerne un dispositif pour supprimer le bruit d'un petit moteur électrique comprenant un élément en forme de disque (1) dans lequel au moins un condensateur Cx et plusieurs condensateurs Cy sont combinés, une première (2) et une seconde (3) électrode étant disposées sur la surface de élément en forme de disque (1). Une première bobine (14) présentant une inductivité prédéterminée est connectée au moyen de son premier connecteur (13) avec la première électrode (2) du condensateur Cx, son second connecteur (12) étant connecté à une première brosse. La première bobine (14) est disposée sur un premier élément de support (10), cet élément de support (10) étant monté sur la surface de l'élément en forme de disque (1).
PCT/EP2007/005587 2007-06-25 2007-06-25 Dispositif pour supprimer le bruit d'un petit moteur Ceased WO2009000291A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2007/005587 WO2009000291A1 (fr) 2007-06-25 2007-06-25 Dispositif pour supprimer le bruit d'un petit moteur
PCT/EP2008/005097 WO2009000501A1 (fr) 2007-06-25 2008-06-24 Dispositif de suppression de bruit dans un petit moteur électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/005587 WO2009000291A1 (fr) 2007-06-25 2007-06-25 Dispositif pour supprimer le bruit d'un petit moteur

Publications (1)

Publication Number Publication Date
WO2009000291A1 true WO2009000291A1 (fr) 2008-12-31

Family

ID=38656476

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/005587 Ceased WO2009000291A1 (fr) 2007-06-25 2007-06-25 Dispositif pour supprimer le bruit d'un petit moteur

Country Status (1)

Country Link
WO (1) WO2009000291A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743211A1 (fr) * 1995-12-27 1997-07-04 Valeo Systemes Dessuyage Machine electrique tournante a lamelles de connexion
EP1503484A2 (fr) * 2003-07-23 2005-02-02 Sintertechnik GmbH Dispositif d'antiparasitage des moteurs électriques
DE10348905A1 (de) * 2003-10-21 2005-05-25 Robert Bosch Gmbh Elektrische Kommutatorläufer-Maschine mit Entstörfilter
WO2006015914A1 (fr) * 2004-08-05 2006-02-16 Robert Bosch Gmbh Moteur electrique a antiparasitage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743211A1 (fr) * 1995-12-27 1997-07-04 Valeo Systemes Dessuyage Machine electrique tournante a lamelles de connexion
EP1503484A2 (fr) * 2003-07-23 2005-02-02 Sintertechnik GmbH Dispositif d'antiparasitage des moteurs électriques
DE10348905A1 (de) * 2003-10-21 2005-05-25 Robert Bosch Gmbh Elektrische Kommutatorläufer-Maschine mit Entstörfilter
WO2006015914A1 (fr) * 2004-08-05 2006-02-16 Robert Bosch Gmbh Moteur electrique a antiparasitage

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