WO1996016467A1 - Electric drive - Google Patents

Electric drive Download PDF

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Publication number
WO1996016467A1
WO1996016467A1 PCT/EP1995/004458 EP9504458W WO9616467A1 WO 1996016467 A1 WO1996016467 A1 WO 1996016467A1 EP 9504458 W EP9504458 W EP 9504458W WO 9616467 A1 WO9616467 A1 WO 9616467A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
motor housing
electric drive
circuit board
connection
Prior art date
Application number
PCT/EP1995/004458
Other languages
German (de)
French (fr)
Inventor
Reiner FÜRST
Original Assignee
Firma J. Eberspächer
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 Firma J. Eberspächer filed Critical Firma J. Eberspächer
Publication of WO1996016467A1 publication Critical patent/WO1996016467A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices

Definitions

  • the invention relates to an electric drive with a DC voltage
  • Electric motor which is housed in a motor housing and has motor windings, and with a motor control circuit connected to the motor windings and having a switching regulator for controlling the electric motor, which is arranged on a printed circuit board and a ground plane for the connection of the printed circuit board Has ground potential.
  • Such a motor drive is used, for example, as a drive for the fan of a vehicle auxiliary heater.
  • the control circuit of such an electric drive contains a switching regulator with which the
  • the invention is therefore based on the object of keeping the motor housing free of electrical interference fields or interference pulses with the simplest and cheapest possible means, without having to apply the motor housing to ground potential.
  • Interference suppression capacitor is connected to the ground surface of the circuit board.
  • Interference pulses or other high-frequency electrical disturbances that occur on the motor housing are dissipated to the ground surface of the printed circuit board via the high-frequency permeable interference suppression capacitor.
  • the motor housing remains separated from the ground surface of the circuit board.
  • this results in an effective interference suppression of the motor housing and, on the other hand, the requirement is met that the motor housing remains potential-free (with regard to the DC voltage of the vehicle and vehicle auxiliary heater).
  • the interference suppression capacitor is preferably arranged on the printed circuit board.
  • the connection between the interference suppression capacitor and the motor housing can be achieved via a connecting cable.
  • DC motor M with a motor housing 11 and at least one motor winding with winding connections M- and M +.
  • this electric drive comprises a Leite ⁇ latte 13, on which there is a switching regulator 15 for regulating the engine speed.
  • the printed circuit board has a winding connection area 17 and a supply voltage connection area 19.
  • the winding connection region 17 is connected on the one hand to the winding connections M- and M + and on the other hand to the switching regulator 15.
  • the supply voltage connection area 19 has connection points for the two voltage potentials -U B and + U B of a vehicle battery and additionally a motor housing connection 21 for the electrical connection to the motor housing 11.
  • An interference suppression capacitor C is connected between the motor housing connection 21 and a ground surface which is connected to the connection for connection to the pole -U B of the vehicle battery. The motor housing 11 is thus connected to the ground surface of the lead plate 13 via this.
  • Engine housing 11 succeeded while meeting the requirement, that the motor housing 11 should not be at the ground potential of the vehicle.

Abstract

An electric drive has a direct voltage electric motor that is mounted in a housing (11) and has motor windings. An electric motor controlling circuit with a switching regulator is connected to the motor windings, is arranged on a printed circuit board (13) and has a grounding surface to connect the printed circuit board (13) to the ground potential. The motor housing (11) is connected to the grounding surface of the printed circuit board (13) by an anti-interference capacitor (C).

Description

Elektroantrieb Electric drive
Die Erfindung betrifft einen Elektroantrieb mit einem Gleichspannungs-The invention relates to an electric drive with a DC voltage
Elektromotor, der in einem Motorgehäuse untergebracht ist und Motor¬ wicklungen aufweist, und mit einer mit den Motorwicklungen verbunde¬ nen, einen Schaltregler aufweisenden Motorsteuerschaltung zur Steue¬ rung des Elektromotors, die auf einer Leiterplatte angeordnet ist und eine Massefläche für den Anschluß der Leiterplatte an Massepotential aufweist.Electric motor, which is housed in a motor housing and has motor windings, and with a motor control circuit connected to the motor windings and having a switching regulator for controlling the electric motor, which is arranged on a printed circuit board and a ground plane for the connection of the printed circuit board Has ground potential.
Ein derartiger Motorantrieb wird beispielsweise als Antrieb für das Gebläse eines Fahrzeugzusatzheizgeräts verwendet. Die Steuerschaltung eines solchen Elektroantriebs enthält einen Schaltregler, mit welchem derSuch a motor drive is used, for example, as a drive for the fan of a vehicle auxiliary heater. The control circuit of such an electric drive contains a switching regulator with which the
Motor getaktet betrieben wird.Engine is operated clocked.
Im Betrieb des Elektromotors eines solchen Elektroantriebs treten elek¬ trische Störsignale auf, die beispielsweise durch Bürsten-Impulse des Elektromotors verursacht werden. Da das Motorgehäuse im allgemeinen nicht gänzlich metallisch geschlossen ist sondern an der Stelle beispiels¬ weise von Kunststoffteilen elektrisch offen bleibt, treten solche elektri¬ schen Störungen auf dem Motorgehäuse auf. Störsignale, die von der Leiterplatte, insbesondere dem Schaltregler, ausgehen, gelangen über die Verbindungsleitungen zwischen Leiterplatte und Motorwicklungen in denWhen the electric motor of such an electric drive is operating, electrical interference signals occur, which are caused, for example, by brushing pulses from the electric motor. Since the motor housing is generally not completely closed in metal but remains electrically open at the location of, for example, plastic parts, such electrical faults occur on the motor housing. Interference signals emanating from the circuit board, in particular the switching regulator, reach the connection lines between the circuit board and the motor windings
Motor und bewirken ebenfalls Störungen auf dem Motorgehäuse. Zusätzliche Störungen entstehen durch Resonanzen als Folge von Über¬ lagerungen von Störsignalen des Motors und Störsignalen des Schaltreg¬ lers. Um solche elektrischen Störungen unwirksam zu machen, hat man das Motorgehäuse bereits auf Masse gelegt. Dies steht aber der Forde¬ rung entgegen, daß das Motorgehäuse für den Fall, daß der Elektroan¬ trieb für ein Fahrzeugzusatzheizgerät verwendet wird, potentialfrei sein soll. Es gibt nämlich die Forderung von Kraftfahrzeugherstellern, bei¬ spielsweise LKW-Herstellern, den Minuspol vom Fahrzeug-Chassis elektrisch trennbar machen zu können. Daher muß auch das Fahrzeug¬ zusatzheizgerät, einschließlich dessen Motorgehäuses, potentialfrei sein. Für diesen Fall kann also das Motorgehäuse nicht einfach an Masse angeschlossen werden.Motor and also cause faults on the motor housing. Additional disturbances arise from resonances as a result of superimposition of disturbance signals of the motor and disturbance signals of the switching regulator. In order to render such electrical interference ineffective, the motor housing has already been grounded. However, this is contrary to the requirement that the motor housing should be potential-free in the event that the electric drive is used for a vehicle auxiliary heater. There is namely the requirement of motor vehicle manufacturers, for example truck manufacturers, to be able to make the negative pole electrically separable from the vehicle chassis. Therefore the vehicle heater, including its motor housing, must also be potential-free. In this case, the motor housing cannot simply be connected to ground.
Es ist schon versucht worden, Entstörfύter, beispielsweise unter Ver- wendung von Ferritringen, einzusetzen, um elektrische Störimpulse vomAttempts have already been made to use interference suppressors, for example using ferrite rings, in order to remove electrical interference pulses from the
Motorgehäuse fernzuhalten. Dies ist aber aufwendig und hat sich nicht als ausreichend wirksam erwiesen.Keep the motor housing away. However, this is complex and has not proven to be sufficiently effective.
Der Erfindung liegt daher die Aufgabe zugrunde, das Motorgehäuse mit möglichst einfachen und kostengünstigen Mitteln von elektrischen Stör¬ feldern oder Störimpulsen freizuhalten, ohne das Motorgehäuse an Mas¬ sepotential legen zu müssen.The invention is therefore based on the object of keeping the motor housing free of electrical interference fields or interference pulses with the simplest and cheapest possible means, without having to apply the motor housing to ground potential.
Diese Aufgabe wird mit der Erfindung dadurch gelöst, daß bei de Elektroantrieb der eingangs angebenen Art das Motorgehäuse über einenThis object is achieved with the invention in that with de electric drive of the type specified in the motor housing via a
Entstörkondensator an die Massefläche der Leiterplatte angeschlossen ist.Interference suppression capacitor is connected to the ground surface of the circuit board.
Störimpulse oder andere hochfrequente elektrische Störungen, die auf dem Motorgehäuse auftreten, werden über den hochfrequenzmäßig durchlässigen Entstörungskondensator zur Massefläche der Leiterplatte abgeleitet. Gleichspannungsmäßig bleibt das Motorgehäuse jedoch von der Massefläche der Leiterplatte getrennt. Dadurch wird einerseits eine wirksame Entstörung des Motorgehäuses erreicht und wird andererseits der Forderung Rechnung getragen, daß das Motorgehäuse (hinsichtlich der Gleichspannungsversonmg von Fahrzeug und Fahrzeugzusatzhei¬ zung) potentialfrei bleibt. Mittels dieser Entstörmethode werden alle zuvor genannten Arten von Störungen beseitigt oder mindestens stark reduziert, nämlich im Motor entstehende Störungen, von der Leiterplat¬ te, insbesondere dem Schaltregler, kommende Störungen und durch Resonanzen infolge Überlagerung dieser beiden Arten von Störungen verursachte Störungen.Interference pulses or other high-frequency electrical disturbances that occur on the motor housing are dissipated to the ground surface of the printed circuit board via the high-frequency permeable interference suppression capacitor. In terms of DC voltage, however, the motor housing remains separated from the ground surface of the circuit board. On the one hand, this results in an effective interference suppression of the motor housing and, on the other hand, the requirement is met that the motor housing remains potential-free (with regard to the DC voltage of the vehicle and vehicle auxiliary heater). By means of this interference suppression method, all of the aforementioned types of interference are eliminated or at least greatly reduced, namely interference arising in the motor, interference coming from the printed circuit board, in particular the switching regulator, and interference caused by resonances as a result of the superimposition of these two types of interference.
Vorzugsweise wird der Entstörkondensator auf der Leiterplatte angeord¬ net. Die Verbindung zwischen dem Entstδrkondensator und dem Motor- gehäuse kann über ein Verbindungskabel erreicht werden. Es besteht aber auch die Möglichkeit, die Leiterplatte an einem Motorgehäu- seflansch zu befestigen, derart, daß eine Anschlußfläche der Leiteφlatte, die mit dem nicht mit der Massefläche verbundenen Anschluß des Ent¬ störkondensators elektrisch verbunden ist, direkt mit dem Motorgehäuse¬ flansch und damit mit dem Motorgehäuse in elektrischen Kontakt gebracht werden kann.The interference suppression capacitor is preferably arranged on the printed circuit board. The connection between the interference suppression capacitor and the motor housing can be achieved via a connecting cable. However, there is also the option of mounting the circuit board on a motor housing. to fasten the flange so that a connection surface of the conductive plate, which is electrically connected to the connection of the interference suppression capacitor not connected to the ground surface, can be brought into electrical contact directly with the motor housing flange and thus with the motor housing.
Die Erfindung wird nun anhand eines Ausführungsbeispiels näher er¬ läutert, das in der einzigen Zeichnungsfigur schematisch dargestellt ist.The invention will now be explained in more detail using an exemplary embodiment which is shown schematically in the single drawing figure.
Das in dieser Zeichnung dargestellte Ausführungsbeispiel umfaßt einenThe embodiment shown in this drawing includes a
Gleichstrommotor M mit einem Motorgehäuse 11 und mindestens einer Motorwicklung mit Wicklungsanschlüssen M- und M+. Außerdem umfaßt dieser Elektroantrieb eine Leiteφlatte 13, auf der sich ein Schaltregler 15 zur Regelung der Motordrehzahl befindet. Die Leiter- platte weist einen Wicklungsanschlußbereich 17 und einen Versorgungs- spannungsanschlußbereich 19 auf. Der Wicklungsan Schlußbereich 17 ist einerseits mit den Wicklungsanschlüssen M- und M+ und andererseits mit dem Schaltregler 15 verbunden. Der Versorungsspannungsanschluß- bereich 19 weist Anschlußpunkte für die beiden Spannungspotentiale -UB und +UB einer Fahrzeugbatterie und zusätzlich einen Motorgehäu¬ seanschluß 21 zum elektrischen Anschluß an das Motorgehäuse 11 auf. Zwischen den Motorhgehäuseanschluß 21 und eine Massefläche, die mit dem Anschluß für die Verbindung mit dem Pol -UB der Fahrzeugbatte¬ rie verbunden ist, ist ein Entstörkondensator C geschaltet. Über diesen ist das Motorgehäuse 11 somit mit der Massefläche der Leiteφlatte 13 verbunden.DC motor M with a motor housing 11 and at least one motor winding with winding connections M- and M +. In addition, this electric drive comprises a Leiteφlatte 13, on which there is a switching regulator 15 for regulating the engine speed. The printed circuit board has a winding connection area 17 and a supply voltage connection area 19. The winding connection region 17 is connected on the one hand to the winding connections M- and M + and on the other hand to the switching regulator 15. The supply voltage connection area 19 has connection points for the two voltage potentials -U B and + U B of a vehicle battery and additionally a motor housing connection 21 for the electrical connection to the motor housing 11. An interference suppression capacitor C is connected between the motor housing connection 21 and a ground surface which is connected to the connection for connection to the pole -U B of the vehicle battery. The motor housing 11 is thus connected to the ground surface of the lead plate 13 via this.
Elektrische Störimpulse und andere hochfrequente elektrische Störfelder, die auf das Motorgehäuse 11 gelangen, werden über den hochfrequenz- mäßig durchlässigen Entstörkondensator C zur Massefläche der Leiter¬ platte 11 abgeleitet und somit unwirksam gemacht. Die gleichspannungs¬ mäßige Potentialtrennung zwischen der Masserfläche der Leiteφlatte 13 und dem Motorgehäuse 11 bleibt erhalten.Electrical interference pulses and other high-frequency electrical interference fields which reach the motor housing 11 are derived via the radio-frequency permeable interference suppression capacitor C to the ground surface of the printed circuit board 11 and thus rendered ineffective. The DC voltage isolation between the ground surface of the conductor plate 13 and the motor housing 11 is retained.
Somit ist auf einfache und kostengünstige Weise eine Entstörung desThis is a simple and inexpensive way to suppress interference
Motorgehäuses 11 gelungen, bei gleichzeitiger Erfüllung der Forderung, daß das Motorgehäuse 11 nicht auf dem Massepotential des Fahrzeugs liegen soll. Engine housing 11 succeeded while meeting the requirement, that the motor housing 11 should not be at the ground potential of the vehicle.

Claims

Ansprüche: Expectations:
1. Elektroantrieb mit einem Gleichspannungs-Elektromotor, der in einem Motorgehäuse (11) untergebracht ist und Motorwicklungen auf¬ weist, und mit einer mit den Motorwicklungen verbundenen, einen Schaltregler aufweisenden Motorsteuerschaltung zur Steuerung des Elektromotors, die auf einer Leiteφlatte (13) angeordnet ist und eine Massefläche für den Anschluß der Leiteφlatte (13) an Massepotential aufweist, dadurch gekennzeichnet, daß das Motorgehäuse (11) über einen Entstörkondensator (C) an die Massefläche der Leiteφlatte (13) angeschlossen ist.1. Electric drive with a DC electric motor, which is housed in a motor housing (11) and has motor windings, and with a motor control circuit connected to the motor windings and having a switching regulator for controlling the electric motor, which is arranged on a conductor plate (13) and has a ground surface for the connection of the conductor plate (13) to ground potential, characterized in that the motor housing (11) is connected to the ground surface of the conductor plate (13) via an interference suppression capacitor (C).
2. Elektroantrieb nach Anspruch 1 , dadurch gekennzeichnet, daß der Entstörkondensator (C) auf der Leiteφlatte (13) angeordnet ist.2. Electric drive according to claim 1, characterized in that the interference suppression capacitor (C) on the Leiteφlatte (13) is arranged.
3. Elektroantrieb nach Anspruch 2, dadurch gekennzeichnet, daß das Motorgehäuse (11) über ein Verbindungskabel mit dem Entstör¬ kondensator (C) verbunden ist.3. Electric drive according to claim 2, characterized in that the motor housing (11) is connected via a connecting cable to the Entstör¬ capacitor (C).
4. Elektroantrieb nach Anspruch 2, dadurch gekennzeichnet, daß die Leiteφlatte (13) an einem Motorgehäuseflansch befestigt ist, derart, daß der Motorgehäuseflansch in direktem elektrischen Kontakt mit einer Anschlußkontaktfläche (21) der Leiteφlatte (13) steht, die mit dem nicht mit der Massefläche verbundenen Anschluß des Entstörkon- densators (C) elektrisch verbunden ist. 4. Electric drive according to claim 2, characterized in that the Leiteφlatte (13) is attached to a motor housing flange, such that the motor housing flange is in direct electrical contact with a connection contact surface (21) of the Leiteφlatte (13), which with the not Ground connection connected to the interference suppression capacitor (C) is electrically connected.
PCT/EP1995/004458 1994-11-23 1995-11-13 Electric drive WO1996016467A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG9418804.1U 1994-11-23
DE9418804U DE9418804U1 (en) 1994-11-23 1994-11-23 Electric drive

Publications (1)

Publication Number Publication Date
WO1996016467A1 true WO1996016467A1 (en) 1996-05-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082979A1 (en) * 2003-03-19 2004-09-30 Siemens Aktiengesellschaft Traction motor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5857060A (en) * 1995-08-02 1999-01-05 Itt Automotive Electrical Systems, Inc. Noise suppression in PWM-driven DC motor
DE19756729A1 (en) * 1997-11-07 1999-05-12 Itt Mfg Enterprises Inc Electric motor and fluid pump module e.g. for anti-lock braking system of motor vehicle
DE102017209742A1 (en) * 2017-06-09 2018-12-13 Robert Bosch Gmbh Controlled load device and method of manufacturing a controlled load device

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Publication number Priority date Publication date Assignee Title
GB536656A (en) * 1939-02-01 1941-05-22 Electrolux Ltd Improvements in devices for suppressing interference by electric motors with wireless
WO1987002840A1 (en) * 1985-11-02 1987-05-07 Robert Bosch Gmbh Interference suppression circuit
JPH034855A (en) * 1989-05-31 1991-01-10 Toto Ltd Driving circuit for bathing hot water circulating pump of bubble generating bathtub
US5070267A (en) * 1989-02-22 1991-12-03 Calsonic Corporation Low-noise electric motor assembly for automotive blower

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB536656A (en) * 1939-02-01 1941-05-22 Electrolux Ltd Improvements in devices for suppressing interference by electric motors with wireless
WO1987002840A1 (en) * 1985-11-02 1987-05-07 Robert Bosch Gmbh Interference suppression circuit
US5070267A (en) * 1989-02-22 1991-12-03 Calsonic Corporation Low-noise electric motor assembly for automotive blower
JPH034855A (en) * 1989-05-31 1991-01-10 Toto Ltd Driving circuit for bathing hot water circulating pump of bubble generating bathtub

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KAISERSWERTH: "PRAKTISCHE FUNK-ENTSTÖRUNG VON DREI HAUSGERÄTEN", SIEMENS-BAUTEILE-INFORMATIONEN, vol. 2, no. 67, pages 58 - 61 *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 112 (C - 0815) 18 March 1991 (1991-03-18) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082979A1 (en) * 2003-03-19 2004-09-30 Siemens Aktiengesellschaft Traction motor
CN100377908C (en) * 2003-03-19 2008-04-02 西门子公司 Traction motor
US7608950B2 (en) 2003-03-19 2009-10-27 Siemens Aktiengesellschaft Traction motor shaft connected to vehicle ground via drive gear

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