DE19902433C1 - Commutator motor has brush bridge with holder slot for capacitor connecting wire connected to housing via contact element with plate with slot as part of clamp blade connector - Google Patents

Abstract

The motor has a metal motor housing, a cap-shaped bearing plate with brushes for electrical current and a noise suppression capacitor (6) mounted inside the motor and connected between the motor housing and a connector. A brush bridge (1) has at least one holder slot (4) for a capacitor connecting wire (5) connected to the housing via a contact element (11) consisting of a plate part with a slot forming part of a clamp blade connector. An Independent claim is also included for a method of manufacturing a commutator motor.

Description

The invention relates to a commutator motor with a metallic motor housing, a cap-like end shield which engages in the motor housing and in which a motor shaft is mounted, the end shield brushes for the supply of electrical current to one Keeps motor commutator electrically isolated from one another and has connection openings, through the connections for the supply of electrical current to the brushes electrical isolated lead to the outside of the motor, and further comprising a suppression capacitor within the Motor arranged and connected between the motor housing and the connection.

Commutator motors generally have the property of transferring the carbon from one commutator bar to the next by induced by the winding Spikes to form sparks, also known as brush fires. This Voltage peaks are in a frequency range between approximately 0.15 MHz to approximately 108 MHz measurable as conducted interference voltages. In a range between approx. 30 MHz to radiated interference power can be measured at approx. 1 GHz. Through the wired Interference voltages and the radiated interference power can radios, Pacemaker or the electronics of the device in which the Commutator motor is built in, therefore it is indispensable due to the induced Keep currents caused by interference voltages as low as possible. For this purpose u. a. Interference suppression capacitors, the large interference currents and thus a large interference power prevent. It is known that certain frequency ranges by incorporating Capacitors between the input terminals and the housing (ground) can be damped are.

DE-36 04 583 C2 (preamble of claim 1) describes the installation of an interference suppression capacitor in a miniature motor with a metallic motor housing and a cap-like cover described. The cover, in which a motor shaft is mounted, engages in the Motor housing, using brush arms for supplying power to one Keeps motor commutator electrically isolated from one another and has connection bores, electrically isolated by the connections for the supply of current to the brush arms Lead motor outside, and further comprising a spark quenching capacitor within the  Motor arranged and connected between the motor housing and the connection that Condenser is arranged by means of lead wires in such a way that one of the Conductor wires on the outside of the motor electrically with one of the Connections is made while another condenser lead wire is connected to one The engagement surface of the closure cover is arranged and electrically connected to the motor housing is hidden in that the sealing cap engages in the motor housing.

The known miniature motor has the disadvantage that by pinching the Connection wire between the cover and motor housing a seal of the Housing is difficult. Another disadvantage is the round shape of the connecting wire, which has a negative impact on contact security. It is also a particular disadvantage the significant line length, the capacitor connections, which have a negative impact can have interference suppression.

A collector machine is known from DE-38 13 999 A1, in particular a Collector motor, with a stator with stator coils, one opposite the stator rotatably mounted rotor with a collector and with a mounting element on which in Carbon brush holder with carbon brushes arranged near the collector, and Interference suppression devices are attached, these interference suppression means being electrical Connection means with first contact elements electrically coupled to the stator coils are connected, these first contact elements being connected by electrical connection means second contact elements electrically connected to the carbon brushes are connected, said connection means have wire-shaped ends and the first and second Contact elements are plate-shaped and electrically conductive and each with at least one gap-shaped opening are provided with a scraper part and a contact part, the Connection means by inserting the wire-shaped ends into the column-shaped Openings are electrically and mechanically connected to the contact elements.

The contact elements mentioned are also known as insulation displacement connections. This simplify the contacting of wired electrical components considerably. The DE-38 13 999 A1, however, shows no possibility of contacting the Motor housing and a motor connection in a simple manner.

It is therefore an object of the present invention to have a commutator motor Interference suppression capacitor so that both a good seal of the motor is possible a reliable electrical connection between the motor housing and  Capacitor is achieved with a small size and little installation effort and one Cable length as short as possible even when using a wired Interference suppression capacitor becomes effective.

The solution to this problem is achieved in that the brush bridge has at least one slot-like receptacle for at least one wire into which one of the Connection wires of the interference suppression capacitor is inserted, a contact element the electrical Connection between the connecting wire inserted in the slot-like receptacle and manufactures the metallic housing, the contact element consists of a sheet metal part, in the at least one slot is introduced as part of a clamping cutting connection, the Contact element is attachable to the brush bridge so that it is held securely Contact element contact formations to improve contact with the housing has, the housing on the inside of its wall between the edge of the Housing and the engine interior is contacted.

The slot-like receptacle for at least one wire makes it easy to insert and mount one of the connecting wires of the interference suppression capacitor. The use of a contact element for the electrical connection between the connecting wire inserted in the slot-like receptacle with the metallic housing makes it possible to form a geometry in the contact connection which is oriented towards the requirements for electrical contacting. The reliability of the contact connection is also ensured by the inclusion of a clamping cutting connection between the contact element and the connecting wire of the interference suppression capacitor. To simplify assembly, the contact element can be attached to the brush bridge and is designed to be securely held. The reliability of the contact connection is also achieved by contact molding, to increase the contact force, which are molded onto the contact element. By arranging the capacitor in the vicinity of the wall, the line length can be reduced considerably, whereby the interference suppression effect of the capacitor is largely retained. The sealing of the housing is facilitated in that the contact point is arranged on the inside of the wall of the motor housing between the edge and the motor interior ( 24 ).

Further advantageous embodiments of the invention are described in the subclaims shown.  

The sealing of the commutator motor is due to the arrangement of the contact area possible between a sealing area and the engine interior.

A particularly simple manufacture of the contact element is achieved in that this is only bent in one direction so that there are only parallel bending lines. Despite this simple design, both the capacitor and the motor housing are easy to contact. For this purpose, each U-leg of the U-shaped curved contact element L-shaped, the one L-leg with a Slot, as part of an insulation displacement connection, and the other L-leg with a contact formation for the electrical connection of the contact element with the Housing of the commutator motor.

To ensure the reliability of the mechanical connection between the contact element and of the brush bridge are barbs with one L-leg of the U-legs in one piece. These barbs dig into the material of the brush bridge and thus prevent the U-shaped contact element from spreading. A Vibration loading of the mechanical connection between the contact element and Brush bridge can not cause the electrical connection between the Contact element and the connecting wire of the capacitor interrupted over time becomes. The use of a contact element tapering towards the end and one A variety of teeth integral with the contact element improves the retention further.

Serve for better contact between the contact element and the housing the tapered contact formations on the contact element, which are firmly in the Claw the housing wall of the commutator. A tip angle of approx. 90 ° has become proven in practice.

The use of multiple contact points between the contact element and the housing additionally increases contact security.

It is possible in a particularly simple manner through the slightly flexible design of the brush bridge to achieve a tolerance compensation so that the desired electrical contact is always between the contact element and the motor housing is possible.  

With certain types of surface treatment, to protect against corrosion, arise As is known, electrically poor or non-conductive layers. For galvanic processes the layer thickness of this surface layer can also vary from the distance to Be dependent on the housing edge. In this case the aim is to have the contact points in Arrange the axial direction as possible in the middle of the motor housing to be sure that Break up poor or non-conductive surface layer through the contact formations to be able to and the contact element in contact with the conductive housing material bring.

For attaching both the interference suppression capacitor and the contact element to the Brush bridge, expediently serves a web-like formation, which is parallel to Motor axis extends from the brush bridge into the motor interior and in assembled state is arranged near the housing wall of the commutator motor, wherein the web-like formation is provided with the slot-shaped receptacle, which is parallel to the web-like formation and to the motor axis. This arrangement is a Particularly simple assembly possible in just one assembly direction. The mounting direction is parallel to the motor axis. In addition, the interference suppression capacitor is already on the end shield held before the final assembly has taken place.

To widen the U-shaped contact element during assembly or in operation To prevent this, protruding areas are formed on the web-like projection. For For better security, the barbs of the contact element engage in these protruding ones Areas.

An alternative or additional attachment of the contact element to the brush bridge is achieved in that an extension is formed on the web-like projection, which holds the contact element after reshaping. The forming can be done by a hot stamp. Due to this reshaping, the contact element is subsequently positively held on the brush bridge.

The slot-shaped receptacle is also particularly suitable for holding two Capacitors, with one capacitor on one side of the web-like projection is arranged. When using a capacitor, a connection with a Choke on one side and a connection to a clamp on the other side the web-like projection.  

It is particularly advantageous after inserting a connecting wire Suppressor capacitor in the slot-like receptacle of the brush bridge the contact element plug in, the electrical connection between the contact element and the Connection area of the interference suppression capacitor and a mechanical attachment of the Contact element is made on the brush bridge and then the brush bridge axially to mount in the housing of the commutator motor, the contact formations of the Contact element works through the surface layer of the housing and thereby one reliable electrical contact between the contact element and the housing is achieved. In addition to an axial assembly of the contact element, there is also a radial one Assembly possible.

The invention is explained in more detail below on the basis of exemplary embodiments. It demonstrate:

Fig. 1 is a three dimensional representation of a section of a brush bridge of the commutator motor according to the invention,

Fig. 2a shows a representation of the brush bridge with two capacitors mounted and an axially mounted contact element,

Fig. 2b is a view of the brush bridge with a mounted capacitor and the contact element,

Fig. 3 shows a second embodiment of the brush bridge of Kommutatormtors according to the invention with radially mounted contact element,

FIG. 4a is a representation of the axially-mounted contact element,

FIG. 4b is a view of the radially mounted contact element,

Fig. 4c is a view of the contact element with barbs

Fig. 4d is a view of the contact element with teeth,

Fig. 5 is an exploded view of the commutator motor according to the invention,

FIG. 6a shows a circuit of the commutator motor according to the invention,

Fig. 6b a further embodiment of the circuit of the commutator motor according to the invention and

Fig. 7h section through the commutator motor according to the invention.

The Fig. 1a shows a detail of a brush bridge 1, a commutator motor, with a web-like conformation 3 in which a slot-shaped receptacle 4 is formed, and an extension 20 on the web-like conformation 3.

FIG. 1b 1a shows the embodiment of Fig. With a mounted thereon capacitor 6, wherein a lead wire is received 5 of the condenser 6 in the slot-shaped receptacle 4 and electrically connected by a contact element 11 which is mounted on the web-like conformation 3 so

Fig. 2a shows a representation of the brush bridge 1 with two mounted capacitors 6 , the connecting wire 5 are inserted in the slot-shaped receptacle 4 . The slot-shaped receptacle 4 is molded into the web-shaped projection 3 of the brush bridge 1 . The slot-shaped receptacle can be dimensioned so that the connecting wires 5 are easily pressed in. One of the capacitors 6 is arranged on one side and the other capacitor 6 on the other side of the web-shaped projection 3 . The connection 30 between a capacitor 6 and the terminal is made by a crimp connection, which is received in a pocket-like receptacle 33 at the bottom of the brush bridge 1 . The connection 28 between a capacitor 6 with a choke is also made as a crimp connection, which is received in a further pocket-like receptacle 33 at the bottom of the brush bridge 1 . An essentially U-shaped contact element 11 , which is provided with slots 13 , is plugged onto the web-shaped projection 3 and thereby takes up the connecting wires 5 of the capacitors in its slots 13 . The slots 13 are designed so that they cut into the surface of the connecting wires 5 in order to achieve a reliable contact. At the same time, the wires are clamped (clamping-cutting connection). Each U-leg 18 a, 18 b has an L-shape, so that L-legs 19 a, 19 b can be distinguished. The slot 13 is introduced in each of the L-legs 19 a. With the L-legs 19 b are contact integrations 16 a, 16 b in one piece.

Fig. 2b shows a variant of Fig. 2a, wherein only one capacitor 6 is provided, the lead wire 5 is inserted into the slot-shaped receptacle 4 and then bent and connected to a terminal by a crimp connection, the crimp connection in the pocket-like receptacle 33 is received in the bottom of the brush bridge. The contact element 11 is plugged onto the web-shaped receptacle 3 and electrically connected to the connecting wire 5 of the capacitor. Protruding areas 26 are formed on the web-like projection 3 , which ensures better securing of the contact element 11 , in particular if it is provided with barbs or teeth.

Fig. 3 shows another embodiment of the invention, in which the contact element 11 is radially attached to the web-like conformation of the brush 3 Brücke 1. In order to ensure a secure mounting in this case, two slits 4 are introduced into the web-like conformation, with one lead wire is inserted into one of the slots 4. 5

Fig. 4a shows a first embodiment of the U-shaped contact element 11 , with the U-legs 18 a, 18 b. Each U-leg 18 a, 18 b is L-shaped and has the L-leg 19 a and 19 b. In the L-legs 19 a, the slot 13 is introduced as part of a clamping-cutting connection. With the L-legs 19 b are contact integrations 16 a and 16 b in one piece. The contact element 11 has only parallel bending lines 17 a, 17 b.

FIG. 4b shows a second embodiment of the contact element 11 , which is provided for the radial assembly according to FIG. 3. Here too there are only parallel bending lines. The contact element 11 is here H-shaped, with two transverse webs 32 . On one side of the transverse webs 32, the Kontaktanformungen 16 extend a, 16 b and on the other side of the transverse webs 32, the legs extend with the slits. 13

FIG. 4c shows a variant of the contact element 11 from FIG. 4a. Here, with the L-legs 19 a barb 27 in one piece, which are arranged on the end face of the sheet-shaped contact element 11 .

FIG. 4d shows a further variant of the contact element 11 from FIG. 4a. Here, with the L-legs 19 a teeth 14 in one piece, which are arranged on the end face of the sheet-shaped contact element 11 . In addition, the L-legs 19 a are tapered towards the end, so that D <d.

In Fig. 5 is an exploded view of the commutator 22 according to the invention, wherein the rotor and the A-side end shield are omitted. Fig. 5 shows the brush bridge 1 is connected to the contact element 11, the housing 12 and the bearing plate 35 which is provided with sealing ribs 37.

The circuit of the commutator motor is explained by Fig. 6a. Here, the commutator motor 22 is connected to the terminals 31 a, 31 b via chokes 29 a, 29 b. The terminals 31 a and 31 b are connected to the housing 12 of the commutator motor 22 via capacitors 6 a, 6 b.

Fig. 6b shows a variant with only one capacitor 6 b, with the negative terminal connected to the terminal 31 a is connected directly to the housing.

In Fig. 7 of the commutator according to the invention 22 is shown in section. The contact area 15 on the inner wall of the housing 12 is arranged between the sealing area 36 and the motor interior 24 . The sealing area 36 is designed here in the form of sealing ribs 37 which are integral with the end shield 35 .

Reference list

1

Brush bridge

2nd

Through opening

3rd

web-like formation

4th

slit-like recording

5

first connecting wire of the capacitor

6

a,

6

b capacitor

7

second connecting wire of the capacitor

11

Contact element

12th

casing

13

Slit of a clamping cutting connection

14

teeth

15

Contact area

16

a,

16

b Contact formations

17th

a,

17th

b bending lines

18th

a,

18th

b U-shaped legs

19th

a,

19th

b L-shaped legs

20th

extension

21

End face of the housing

22

Commutator motor

24th

A end shield

26

projecting areas

27

Barbs

28

Connection with throttle

29

a,

29

b throttle

30th

Connection with clamp

31

a,

31

b clamp

32

Crossbar

33

pocket-like recording

35

brush-side (B) end shield

36

Sealing area

37

Sealing ribs

Claims (28)

1. Commutator motor with a metallic motor housing, a cap-like bearing plate which engages in the motor housing and in which a motor shaft is mounted, the bearing plate keeping brushes for the supply of electrical current to a motor commutator electrically insulated from one another and having connection openings through the connections for the supply of electric current to the brushes lead to the outside of the motor in an electrically insulated manner, and furthermore an interference suppression capacitor is arranged inside the motor and connected between the motor housing and the connection, characterized in that:

• a brush bridge ( 1 ) has at least one slot-like receptacle ( 4 ) for at least one wire, into which one of the connecting wires ( 5 ) of the interference suppression capacitor ( 6 ) is inserted,
• a contact element ( 11 ) establishes the electrical connection between the connecting wire ( 5 ) inserted in the slot-like receptacle ( 4 ) and the metallic housing ( 12 ),
• - The contact element ( 11 ) consists of a sheet metal part, into which at least one slot ( 13 ) is made as part of a clamping cutting connection, the connecting wire ( 5 ) being clamped in the slot ( 13 ),
• - The contact element ( 11 ) on the brush bridge ( 1 ) can be fastened so that it is held securely,
• - The contact element ( 11 ) has contact formations ( 16 a, 16 b) to improve contact with the housing ( 12 ), the housing ( 12 ) being contacted on the inside of its wall and
• - The contact area ( 15 ) between the end face ( 21 ) of the housing ( 12 ) and the opposite A-bearing plate ( 24 ) is arranged.

2. Commutator motor according to claim 1, characterized in that the commutator motor ( 22 ) is at least splash-proof and the contact area ( 15 ) between a sealing area ( 36 ) and the A-bearing plate ( 24 ) is arranged. 3. Commutator motor according to claim 1 or 2, characterized in that the contact element ( 11 ) is bent in a U-shape and has only parallel or approximately parallel bending lines ( 17 a, 17 b). 4. commutator motor according to claim 3, characterized in that the U-legs ( 18 a, 18 b) of the U-shaped contact element ( 11 ) are L-shaped. 5. commutator motor according to claim 4, characterized in that the one L-leg ( 19 a) of the U-leg ( 18 a, 18 b) of the U-shaped contact element ( 11 ) with a parallel to the L-leg ( 19 a) extending open slot ( 13 ) is provided, which is designed as part of an insulation displacement connection. 6. commutator motor according to claim 4 or 5, characterized in that the width of the contact element ( 11 ) between the bending lines ( 17 a, 17 b) and the end of the L-leg ( 19 a) of the U-leg ( 18 a, 18 b) tapered towards the end. 7. commutator motor according to claim 4, 5 or 6, characterized in that the one L-leg ( 19 a) of the U-leg ( 18 a, 18 b) of the U-shaped contact element ( 11 ) with barb ( 27 ) is in one piece . 8. commutator motor according to claim 4, 5, 6 or 7, characterized in that the one L-leg ( 19 a) of the U-leg ( 18 a, 18 b) of the U-shaped contact element ( 11 ) with a plurality of teeth ( 14 ) is in one piece. 9. commutator motor according to claim 4, 5, 6, 7 or 8, characterized in that the other L-leg ( 19 b) of the U-leg ( 18 a, 18 b) of the U-shaped contact element ( 11 ) with the contact molding ( 16 a, 16 b) is provided. 10. Commutator motor according to claim 1, characterized in that the contact element ( 11 ) is H-shaped, the contact formation ( 16 a, 16 b) on H-legs on one side of a crosspiece ( 32 ) and the slots ( 13 ) the other side of the crosspiece ( 32 ) are arranged. 11. Commutator motor according to claim 9 or 10, characterized in that the contact formation ( 16 a, 16 b) is tapered, the tip angle (→) being approximately 90 °. 12. Commutator motor according to at least one of the preceding claims, characterized in that the contact area consists of several contact points which are formed by contact projections ( 16 a, 16 b) of the contact element ( 11 ) in the radial direction. 13. Commutator motor according to at least one of the preceding claims, characterized in that the brush bridge ( 1 ) in the contact area ( 15 ) between the contact element ( 11 ) and the housing ( 12 ) is elastically resilient. 14. Commutator motor according to at least one of the preceding claims, characterized in that the contact region ( 15 ) is arranged in the axial direction in the region between the end face ( 21 ) and the center of the housing ( 12 ) of the commutator motor ( 22 ). 15. Commutator motor according to at least one of the preceding claims, characterized in that the brush bridge ( 1 ) has a web-like projection ( 3 ) which extends parallel to the motor axis from the brush bridge ( 1 ) into the motor interior ( 24 ) and in the assembled state is arranged near the housing wall of the commutator motor ( 22 ), the web-like projection ( 3 ) being provided with the slot-shaped receptacle ( 4 ) which runs parallel to the web-like projection ( 3 ) and the motor axis. 16. Commutator motor according to at least one of the preceding claims, characterized in that projecting regions ( 26 ) are formed on the web-like projection ( 3 ), which expand the U-legs ( 18 a, 18 b) of the U-shaped contact element ( 11 ) prevent. 17. Commutator motor according to at least one of the preceding claims, characterized in that the contact element ( 11 ) with its barbs ( 27 ) is at least buried in the projecting areas ( 26 ). 18. Commutator motor according to at least one of the preceding claims, characterized in that an extension ( 20 ) is formed on the web-like projection ( 3 ), which holds the contact element ( 11 ) after deformation. 19. Commutator motor according to at least one of the preceding claims, characterized in that the connecting wires of two capacitors ( 6 ) are received in the slot-like receptacle ( 4 ). 20. Commutator motor according to at least one of the preceding claims, characterized in that a capacitor ( 6 ) is arranged on both sides of the web-like projection ( 3 ). 21. Commutator motor according to at least one of the preceding claims, characterized in that the connecting wire of a capacitor ( 6 ) is received in the slot-like receptacle ( 4 ), the connection ( 28 ) of the capacitor ( 6 ) with a choke ( 29 ) on one Side of the web-like projection ( 3 ) is arranged and the connection ( 30 ) of the capacitor with a motor terminal ( 31 ) is arranged on the opposite side of the web-like projection ( 3 ), the capacitor ( 6 ) being arranged on one side or the other is. 22. Commutator motor according to at least one of the preceding claims, characterized in that pocket-like receptacles ( 33 ) for crimp connections ( 28 , 30 ) are integrally formed in the bottom of the brush bridge ( 1 ) on both sides of the web-like projection ( 3 ). 23. A method for producing a commutator motor according to at least one of the preceding claims, characterized by the following method steps and sequence of methods:

• a) inserting a connecting wire ( 5 ) into the slot-like receptacle ( 4 ) of the brush bridge ( 1 ),
• b) plugging on the contact element ( 11 ), the electrical connection between the contact element ( 11 ) and the connection region ( 5 ) of the interference suppression capacitor ( 6 ) and a mechanical fastening of the contact element ( 11 ) on the brush bridge ( 1 ) being established,
• c) axially mounting the brush bridge in the housing ( 12 ) of the commutator motor ( 22 ), the contact formations ( 16 a, 16 b) working through a surface layer of the housing ( 12 ) and thereby reliable electrical contact between the contact element ( 11 ) and the housing ( 12 ) is reached.

24. A method for producing a commutator motor according to claim 23, characterized in that the contact element ( 11 ) is mounted in the axial direction on the brush bridge ( 1 ). 25. A method for producing a commutator motor according to claim 23, characterized in that the contact element ( 11 ) is mounted in the radial direction on the brush bridge ( 1 ). 26. A method for producing a commutator motor according to claim 23, characterized in that the contact element ( 11 ) is firmly connected by hot stamping or welding to the brush bridge ( 1 ). 27. Commutator motor according to at least one of the preceding claims, characterized in that the barbs ( 27 ) or the teeth ( 14 ) on the contact element ( 11 ) act self-furrowing and create a positive position securing. 28. Commutator motor according to at least one of the preceding claims, characterized in that the brush bridge ( 1 ) with the end shield ( 35 ) is in one piece.