EP2625772A1

EP2625772A1 - Direct current electric machine

Info

Publication number: EP2625772A1
Application number: EP11741583.6A
Authority: EP
Inventors: Thorsten Kremer; Friedrich Wendel; Thomas Klotzbuecher; Joerg Mayer
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2010-10-06
Filing date: 2011-08-11
Publication date: 2013-08-14
Also published as: WO2012045507A1; US20160190900A1; US9467027B2; CN103155370A; DE102010042072A1

Abstract

The invention relates to a direct current electric machine (1) comprising a housing (3), a rotor (7) that has coils (11) as electromagnets (12), a stator (13) with stator magnets (14), said rotor (7) and stator (13) preferably being arranged inside the housing (3), and said machine also preferably comprising sliding contacts (15) for conducting current which is to be conducted through the coils (11) of the rotor (7), as a commutator (16), and an interference suppressor (18) for electrical interference that emanates from the direct current electric machine (1), said interference suppressor (18) being positioned outside of the housing (3).

Description

Description title

DC Electric Machine The present invention relates to a DC electric machine according to the

The preamble of claim 1, an actuator according to the preamble of claim 13 and an internal combustion engine according to the preamble of claim 15th

State of the art

DC electric machines are used in various technical

Applications as DC electric motors or as

Gleichstromelektrogeneratoren used. DC electric machines include a rotor with coils as electromagnets and a stator

Statormagneten on. In this case, the rotor and the stator are arranged within a housing and on the rotor sliding contacts are arranged as a commutator. The commutator serves as a commutator for supplying electric current into the coils of the rotor and thereby be the

Sliding contacts on the rotor by means of two sliding contacts electrically contacted as carbon brushes. When breaking contact of the carbon brushes on the

Sliding contacts of the rotor, it comes to the generation of, in particular high-frequency, noise. These high frequency spurious signals affect other electrical applications in the vicinity of the DC electrical machine. For example, when using the DC electric machine on a

Actuator in a motor vehicle, the high-frequency interference to radio or television sets of the motor vehicle cause functional impairment. The DC electric machines are therefore provided with a suppression device to emanating from the sliding contacts

To reduce high frequency interference or to turn it off completely. In this case, occur within the housing of the electric machine large

Temperature fluctuations and these are in the range of about -40 ° C to + 160 °. Further, such DC electric machines in automobiles are subjected to a high mechanical vibration stress.

Due to this occurring large thermal and mechanical

Loads arranged on the DC electric machine

Entstöreinrichtung can within the housing of the

DC electric machine only a few of the available

Entstöreinrichtungen these loads in the long term withstand.

DE 10 2006 055 257 A1 shows an actuator for an actuator, in particular for a throttle valve in the intake system

Internal combustion engine, with a controller housing, in which at least one

Receiving chamber is provided with a chamber opening, and having a fixed in the receiving chamber electric motor, which has a hollow cylindrical motor housing with a cylinder wall and at least one close to the chamber opening near the front end of the motor housing bearing plate, the bearing plate distributed over the circumference

having arranged shield segments.

Disclosure of the Invention Advantages of the Invention

DC electric machine according to the invention comprising a housing, a rotor with coils as electromagnet, a stator with stator magnets, wherein preferably the rotor and the stator are arranged within the housing, preferably sliding contacts for conducting current through the coils of the rotor as a commutator, a suppressor for of the

DC electrical machine outgoing electrical noise, the Entstöreinrichtung is positioned outside the housing. The suppression device is advantageously arranged outside the housing of the DC electric machine, so that thereby the thermal stresses of the suppression device are low. Within the housing of the DC electric machine occur larger temperatures or larger temperature fluctuations, due to the heat of the stator and the rotor, so that a arranged outside the housing of the DC electric machine Entstöreinrichtung is exposed to lower thermal stresses.

In an additional embodiment, the suppression device comprises at least one electronic component, in particular at least one capacitor, and preferably lines.

In an additional embodiment, the interference suppression device comprises as an electronic component a Wderstand and / or a transistor and / or a diode.

In a supplementary embodiment, the suppression device is attached to or on a printed circuit board.

In an additional variant, the circuit board is a circuit board with an electrically insulating carrier material made of FR1, FR2, FR3, FR4 or FR5 or a flex circuit board with a film as a carrier material.

Suitably, the circuit board is fixed to the housing or a holding plate of the DC electric machine and is preferably the holding plate part of the housing.

In a supplementary embodiment, the at least one electronic component is designed as an SMD component or as a wired ceramic capacitor.

In an additional embodiment, the lines are formed as conductor tracks on the electrically insulating carrier material of the printed circuit board. The

Anti-interference device comprises at least one electronic component and lines, in particular designed as strip conductors. The anti-interference device is on the printed circuit board arranged and the electronic components as SM D components are also arranged on the circuit board. The interconnects are thereby produced on the circuit board, for example by means of a photochemical process with stamping or wire laying technology. As a result, different printed conductors with corresponding electronic components can easily be produced for different embodiments on a printed circuit board. In the manufacture of the interference suppression device, for example, only by changing the software for producing the strip conductors and by using different or a different number of electronic components another

Entstöreinrichtung with another electrical or electronic

Wiring diagram be provided. This makes it possible to easily produce different Entstöreinrichtungen with low

Production costs. Due to the arrangement of the electronic components on the circuit board is also the suppression device, especially for mechanical stress, especially vibration, well resistant and can be permanently exposed to this, without causing damage to the suppression device.

In an additional variant, the printed circuit board is mounted on a flat surface of the housing or the retaining plate.

In a further embodiment, the DC electric machine comprises a first electrical contact element, in particular a contact plate or a contact pin, and a second electrical contact element, in particular a contact plate or a contact pin.

Preferably, the circuit board has one or two openings and the first and / or second contact element is arranged in the opening or in the openings. The circuit board can thus be particularly easily attached to a housing or a holding plate of the DC electric machine. The printed circuit board is thereby pushed with the two openings on the two contact elements, so that the two contact elements are arranged within the openings of the circuit board and then it is thus possible in a simple manner, the lines, in particular tracks, the Entstöreinrichtung electrically contact with the two contact elements for example by welding a bendable contact foil to the contact elements, for example by means of ultrasonic welding. The bendable contact foil can also by means of other joining techniques, such as soldering, with the two

Contact elements are connected.

In a supplementary embodiment, the lines are electrically conductively connected to the first and second contact elements, in particular by means of a bendable contact foil.

In a supplementary variant, the DC electric machine is a

DC electric motor.

Inventive actuator for an actuator comprising a

DC electric motor, a transmission, the actuator, preferably a

Actuator housing, wherein the DC electric motor is designed as a DC electric motor described in this patent application.

In an additional embodiment, the actuator is a throttle or a roller blind within an intake passage for combustion air for an internal combustion engine.

Internal combustion engine according to the invention with an actuator for an actuator, wherein the actuator designed as an actuator described in this patent application.

In a variant, the DC electric machine is a DC generator.

In a further embodiment, the first and / or second contact element with a, preferably bendable, contact wire is connected to the line.

Brief description of the drawings

Hereinafter, an embodiment of the invention below

With reference to the accompanying drawings described in more detail. It shows: a greatly simplified cross-section a DC electric machine,

Fig. 2 is an electrical circuit diagram of a suppression device for

the DC electric machine according to FIG. 1,

3 is a perspective view of the electric machine of FIG. 1 with the Entstöreinrichtung of FIG. 2,

4 is a perspective view of the Entstöreinrichtung of FIG. 3,

5 shows a cross section of a circuit board and a flex circuit board,

Fig. 6 is a greatly simplified cross-section of an actuator with

the DC electric machine of FIG. 1 and

Fig. 7 is a greatly simplified representation of an internal combustion engine with the actuator.

Embodiments of the invention

An illustrated in Fig. 1, 3 and 6 electric machine 1 as

DC electric motor 2 is used in an actuator 40 (FIG. 6) for moving an actuator 41 designed as a throttle flap 42. The actuator 40 has a gear 43 with a first gear 9 on a rotor shaft 8 of the DC electric motor 2 and a second gear 44. The teeth, not shown, of the two gears 9 and 44 mesh with each other, so that by means of a rotational movement of the rotor shaft 8, a throttle shaft 47 can be set in a rotational movement and arranged on the throttle shaft 47 throttle 42 thus also performs a rotational movement. Thereby, it is possible to change an intake passage 46 for combustion air of an internal combustion engine 49, the size of the flow cross-sectional area. The throttle shaft 47 is supported by means of a throttle shaft bearing 48 to an actuator housing 45. The DC electric machine 1, the transmission 43 and the intake passage 46 with the throttle valve 42 disposed therein are also disposed within the actuator housing 45. The actuator 40 is arranged in the vicinity of the internal combustion engine 49 within an engine compartment of a motor vehicle, not shown, so that thereby the

DC electric machine 1 high mechanical and thermal

Exposed to stress. The engine 49 causes mechanical vibrations as vibrations, which also occur thereby on the DC electric machine 1. In addition, the internal combustion engine 49 emits heat, which also causes an increase in the temperature and thus increased maximum possible temperatures on the DC electric machine 1.

The DC electric motor 2 has a housing 3 (FIG. 1). To the

Housing 3 stator magnets 14 are arranged as a stator 13. The

Statormagnete 14 can either permanent magnets or

Be electromagnets. A rotor 7 with a rotor shaft 8 performs a rotational movement about an axis of rotation, not shown, and the rotor shaft 8 is mounted on the housing 3 by means of a bearing 10. The rotor 7 has coils 1 1 as electromagnets 12. For energizing the coils 1 1 with power, the rotor 7 with sliding contacts 15 as a commutator 16, that is as

Stromwender 16, provided. Thus, according to the rotational angular position of the rotor 7, the corresponding coils 11 are energized. This is done by a sliding contact 15 as carbon brush 17 contacts the sliding contacts 15 on the rotor 7. The two carbon brushes 17 are electrically and mechanically connected to a first contact element 32 and a second electrical contact element 33. The two electrical contact elements 32, 33 are through

Openings in the housing 3 from the housing 3 to the outside of

Housing guided (Fig. 3 and 1). In this case, the part of the housing through which the two electrical contact elements 32, 33 are guided, formed as a holding plate 4.

On the support plate 4 as part of the housing 3, a suppression device 18 is arranged. When contacting the different sliding contacts 15 of the commutator 16 with the carbon brushes 17, high-frequency interference signals that can lead to disturbances in adjacent electrical applications to the DC electric machine 1 occur during contact separation. At the

Use of the DC electric machine 1 in the actuator 40 of a Motor vehicles can thus cause these high-frequency interference radio or television equipment to functional impairments. Around

at least partially eliminate high-frequency interference, the

Gleichstromelektromaschine 1 the Entstöreinrichtung 18 on. The electrical circuit diagram of the suppression device 18 is shown in Fig. 2. The

DC electric machine 1 as a DC electric motor 2 is connected to a power source, not shown, with a plus and minus pole. In this case, the electric current through lines 24 to the first and second

electrical contact element 32, 33 of the DC electric motor 2 passed. A capacitor 21 as x-capacitor 22 between the two lines 24 to

Supply of electric current to the DC electric motor 2 causes a suppression of the DC electric motor 2. Further, according to the electrical circuit diagram in Fig. 2, two additional y capacitors 23 to the housing 3 of the DC electric motor 2 and the two lines for supplying direct current to the DC electric motor. 2 connected. The two y-capacitors 23 cause an additional suppression of the DC electric motor. 2

The suppressor 18 with the electrical circuit diagram of FIG. 2 is arranged on a circuit board 25 as a circuit board 26. The circuit board 25 and

Board 26 consists of the material FR4 as a carrier material 29, that is made of epoxy resin and glass fiber fabric. The lines 24 are as

Conductor tracks 50 formed on the board 26. The interconnects 50 are, for example, produced photochemically and consist of a thin layer of copper. The capacitors 21 as electronic components 19 are SMD

Components 20. In addition to the conductor tracks 50 as a line section 38 on the circuit board 25, the circuit board 25 and insulating sections 37 on. The

Insulating sections 37 are thereby bridged by the capacitors 21 as SMD components 20 (FIGS. 3 and 4), so that the electrical circuit diagram according to FIG. 2 can be represented on the printed circuit board 25. The printed circuit board 25 has a first opening 27 and a second opening 28 (FIG. 3). Through the two openings 27, 28, the two electrical contact elements 32, 33 are guided as contact plates 34 or contact pins 35. On the line section 38 of the interference suppression device 18 in the region of the two openings 27, 28, a contact foil 36 made of an electrically conductive material are respectively arranged. The

Circuit board 25 (FIG. 4) can thus be easily applied to the holding plate 4 are and the two contact elements 32, 33 guided through the two openings 27, 28, so that after placing the circuit board 25 on the support plate 4, the two contact elements 32, 33 are disposed within the two openings 27, 28. As a result, part of the contact sheet 36 formed as a flap is also moved upward and lies on the two

Contact elements 32, 33 on. This movable and not on the

Line section 38 fixed part of the contact sheet 36 as a flap is then with the two contact elements 32, 33 means

Ultrasonic welding connected. Due to the mechanical and electrical contact of the contact foil 36 with the corresponding line section 38 is thus an electrical connection between the electrical

Contact elements 32, 33 and the corresponding line section 38. These two line sections 38 on the two contact elements 32, 33 are bridged only by the x-capacitor 22.

The circuit board 25 as a carrier material 29 for the suppression device 18 also has a third opening 39. Through the third opening 39, a bolt 5 is guided on the support plate 4 and by means of a screw 6 so that the circuit board 25 is mechanically fastened to the support plate 4. Furthermore, the bolt 5 made of electrically conductive material, such as metal, as well as the screw

6 and the support plate 4. Thus, in addition to the mechanical contact between the circuit board 25 and the support plate 4 by means of the screw 6 and the bolt 5, an electrical connection between the line section 38 to the third opening 39 and the support plate 4. The support plate 4 and the entire housing 3 are made of an electrically conductive material, so that thereby an electrical connection between the housing 3 and the two y-capacitors 23, due to the electrical connection of the two y-capacitors 23 to the line section 38 at the third opening 39. Die Line sections 38 are shown in dotted lines in Fig. 3 and 4.

Instead of the board 26 of FR4 can be used as a support material 29 for the

Entstöreinrichtung 18, that is, the electronic components 19 and the interconnects 50, and a film 31 are used as a flex circuit board 30 (Fig. 5). The use of the flex circuit board 30 has the advantage that, on the one hand, it has a smaller overall height or thickness than the circuit board 26 and, on the other hand, the film 36 can also be bent. This will be on the DC electric motor 2 for the suppressor 18 requires less space or height than in the embodiment shown in FIGS. 3 and 4.

The details of the various embodiments may be combined with each other unless otherwise specified.

Overall, are considered with the invention

DC electric machine 1 and the actuator 40 according to the invention associated significant advantages. The Entstöreinrichtung 18 is on a

Printed circuit board 25 arranged as a printed circuit and thus requires little space or height. The arrangement of the suppression device 18 outside the housing 3 requires that the suppression device 18 is exposed to lower thermal stresses. Due to the design of the interference suppression device 18 as a printed circuit with SM D components 20 and interconnects 50 on the circuit board 25, the suppression device 18 can withstand long-term high mechanical loads. The

Suppression device 18 with the tracks 50 is produced for example by means of photochemical processes, so that only by changing the software in the production of the tracks 50 on the circuit board 25 and the use of other electronic components 19 or other number of electronic components 19 different interference suppression 18 low production costs can be provided. Further, DC electric machines 1 can be both with and without

Entstöreinrichtung 18 are provided with an otherwise identical DC electric motor 2 or an identical

Gleichstromelektromaschine 1. In a DC electric machine 1 without suppressor 18 is no printed circuit board 25 is arranged with the corresponding printed circuit on the holding plate 4 and at a

DC electric machine 1 with anti-interference device 18, only the circuit board 25 is fixed with the screw 6 on the support plate 4. As a result, in the manufacture of electric machines 1 for different

Motor vehicles are manufactured in the production otherwise identical electric machines 1 and these are provided either with or without anti-interference device 18. This allows the manufacturing costs for the

Electric machine 1 can be lowered in an advantageous manner.

Claims

claims

DC electric machine (1) comprising

a housing (3),

a rotor (7) with coils (11) as electromagnets (12),

a stator (13) with stator magnets (14),

wherein preferably the rotor (7) and the stator (13) are arranged within the housing (3),

- Preferably sliding contacts (15) for conducting by the coils (1 1) of the rotor (7) to be conducted current as a commutator (16),

a de-interference device (18) for electrical faults emanating from the DC electric machine (1),

characterized in that

the Entstöreinrichtung (18) outside the housing (3) is positioned.

A DC electric machine according to claim 1,

characterized in that

the interference suppression device (18) comprises at least one electronic component (19), in particular at least one capacitor (21), and preferably lines (24).

A DC electric machine according to claim 1 or 2,

characterized in that

the Entstöreinrichtung (18) is attached to or on a printed circuit board (25).

A DC electric machine according to claim 3,

characterized in that

the circuit board (25) is a circuit board (26) with an electrically insulating carrier material of FR1, FR2, FR3, FR4 or FR5 or a

Flex circuit board (30) with a film (31) as a carrier material.

5. DC electric machine according to claim 3 or 4,

characterized in that the printed circuit board (25) is fastened to the housing (3) or a retaining plate (4) of the DC electric machine (1) and preferably the retaining plate (4) is part of the housing (3).

6. DC electric machine according to one or more of claims 2 to 5,

characterized in that

the at least one electronic component (19) is designed as an SMD component (20).

7. DC electric machine according to one or more of claims 2 to 6,

characterized in that

the lines (24) are formed as conductor tracks (50) on the electrically insulating carrier material of the printed circuit board (25).

8. DC electric machine according to one or more of

previous claims,

characterized in that

the circuit board (25) is mounted on a flat surface of the housing (3) or the holding plate (4).

9. DC electric machine according to one or more of

previous claims,

characterized in that

the DC electric machine (1) a first electrical

Contact element (32), in particular a contact plate (34) or a contact pin (35), and a second electrical contact element (33), in particular a contact plate (34) or a contact pin (35) comprises.

10. DC electric machine according to one or more of claims 3 to 9,

characterized in that

the printed circuit board (25) has one or two openings (27, 28) and the first and / or second contact element (32, 33) in the opening (27, 28) or in the openings (27, 28) is arranged.

1 1. A DC electric machine according to one or more of claims 2 to 10,

characterized in that

the lines (24) are electrically conductively connected to the first and second contact elements (32, 33), in particular by means of a bendable contact foil (36).

12. DC electric machine according to one or more of

previous claims,

characterized in that

the DC electric machine (1) is a DC electric motor (2).

13. actuator (40) for an actuator (41) comprising

a DC electric motor (2),

a transmission (43),

the actuator (41),

preferably an actuator housing (45),

characterized in that

the DC electric motor (2) is designed according to one or more of the preceding claims.

14. Actuator according to claim 13,

characterized in that

the actuator (41) a throttle valve (42) within a

Intake passage (46) for combustion air for an internal combustion engine (49).

15. Internal combustion engine (49) with an actuator (40) for a

Actuator (41),

characterized in that

the actuator (40) is designed according to claim 13 or 14.