ELECTRIC MOTOR WITH SUPPRESSION DEVICE AND METHOD FOR ARRANGING A SUPPRESSION DEVICE ON AN ELECTRIC MOTOR

Abstract

An electric motor with a housing, at least two terminal contacts and at least one suppression device against electromagnetic emissions, wherein the suppression device comprises at least one circuit carrier with at least one filter circuit, wherein the circuit carrier is arranged on an end side of the electric motor, and wherein the filter circuit is electrically connected to the two terminal contacts. The manufacturing effort is reduced in that at least one contact means electrically connected to the filter circuit is attached to the circuit carrier, and in that the contact means bears against a ground contact with at least partial deformation, so that the filter circuit is electrically connected to the ground contact via the contact means.

Claims

1. An electric motor comprising a housing, at least two terminal contacts and at least one suppression device against electromagnetic emissions, the suppression device having at least one circuit carrier with at least one filter circuit, the circuit carrier being arranged on an end side of the electric motor, and the filter circuit being electrically connected to the two terminal contacts, at least one contact means electrically connected to the filter circuit is attached to the circuit carrier, and in that the contact means bears against a ground contact with at least partial deformation, so that the filter circuit is electrically connected to the ground contact via the contact means.

2. The electric motor according to claim 1, further comprising at least two, or at least three or at least four contact means are attached to the circuit carrier.

3. The electric motor according to claim 1, further comprising the ground contact is formed by at least one of the housing and at least indirectly or directly by an back iron of the electric motor, and wherein the contact means bears at least partially against at least one of the housing and at least indirectly or directly against the back iron.

4. The electric motor according to claim 1, further comprising the housing has at least one deformation and wherein the contact means rests in the deformation.

5. The electric motor according to claim 1, further comprising the contact means is designed and arranged such that it does not project beyond the outer contour of the housing.

6. The electric motor according to claim 1, further comprising the contact means is at least one of at least partially elastically deformed and at least partially compressed.

7. The electric motor according to claim 1, further comprising the contact means is made of an electrically conductive coated, conductive or non-conductive, material or an electrically conductive plastic, silicone or rubber.

8. The electric motor according to claim 1, further comprising the contact means is arranged in an edge region of the circuit carrier.

9. The electric motor according to claim 1, further comprising the contact means is at least one of glued and soldered to the circuit carrier.

10. The electric motor according to claim 1, further comprising the circuit carrier is arranged in a cover limiting the housing.

11. A method for arranging a suppression device against electromagnetic emissions on an electric motor, comprising at least the following method steps: providing an electric motor with at least two terminal contacts, providing a suppression device with at least one circuit carrier with a filter circuit and at least one contact means, moving the suppression device into its mounting position on the electric motor while deforming the contact means and simultaneously contacting a ground contact, and fixing the suppression device in the mounting position.

12. Use of a deformable electrically conductive coated contact means attached to a circuit carrier for contacting a filter circuit on the circuit carrier with at least one ground contact of an electric motor.

13. The electric motor according to claim 4, further comprising the deformation is in an edge region oriented in the direction of the suppression device.

14. The electric motor according to claim 4, further comprising the deformation is formed by caulking.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Further advantageous embodiments of the invention are apparent from the following description of the figures and the dependent claims.

[0038] It show:

[0039] FIG. 1 an example of an electric motor with suppression device in perspective view,

[0040] FIG. 2 a section through a device according to FIG. 1 in the edge area,

[0041] FIG. 3 an embodiment of an electric motor in perspective view,

[0042] FIG. 4a a perspective view of an embodiment of an interference suppression device from below,

[0043] FIG. 4b the example of FIG. 4a from above,

[0044] FIG. 4c the embodiment of FIGS. 4a and 4b in side view,

[0045] FIG. 5 an example of a filter circuit as a circuit diagram,

[0046] FIG. 6 an embodiment of an electric motor during assembly, and

[0047] FIG. 7 a schematic embodiment of a method for arranging a suppression device.

[0048] In the various figures in the drawing, the same parts are always given the same reference signs.

DETAILED DESCRIPTION

[0049] Regarding the following description, it is claimed that the invention is not limited to the embodiments and thereby not limited to all or several features of described feature combinations, rather each individual partial feature of the/each embodiment is also of importance for the subject matter of the invention detached from all other partial features described in connection therewith for itself and also in combination with any features of another embodiment.

[0050] FIG. 1 shows an example of an electric motor 1 in perspective view. The electric motor 1 has a housing 2 and two terminal contacts 3, with which the brushes are contacted in this embodiment. The housing 2 is made of an electrically conductive metal. The electric motor 1 has the usual components of an electric motor 1 within the housing 2, namely at least one rotor, at least one stator and, in this embodiment, at least one commutator.

[0051] A suppression device 4 is arranged on the housing 2 of the electric motor 1, which has a circuit carrier 5 with a filter circuit 6 arranged thereon. The filter circuit 6 is electrically connected to the terminal contacts 3. Four contact means 7 are also attached to the circuit carrier 5 and electrically connected to the filter circuit 6. The filter circuit 6 has conductive connections between the components of the filter circuit 6, which are not shown separately in FIG. 1. An exemplary filter circuit 6 is shown in FIG. 5.

[0052] According to FIG. 1, the contact means 7 are at least partially deformed and are in contact with aground contact 8, which in this embodiment is at least partially formed by the housing 2. The housing 2 is electrically connected to the back iron. FIG. 2 shows a section through one of the contact means 7 according to FIG. 1. The contact means 7 is deformed in the area of the deformation 10 of the housing 2 and lies against the housing 2 and the brush cover 9 over the entire surface in the deformation 10. The contact means 7 is at least partially compressed according to FIG. 2 and does not extend beyond the contour of the housing 2, in particular not in the radial direction.

[0053] According to FIG. 1, the contact means 7 are arranged in the edge region 5a of the circuit carrier 5 and are distributed evenly spaced apart to each other on the circuit carrier 5. The housing 2 has four concave deformations 10, which in this embodiment are formed by caulking the housing 2 with the brush cover 9. Each of the contact means 7 is arranged in one of the deformations 10. The contact means 7 are formed and arranged in such a way that they are arranged within the deformations 10 in such a way that they do not project beyond the outer contour of the housing 2, in particular not in the radial direction, before the deformation.

[0054] In this embodiment, the contact means 7 are designed as an elastomer which is provided with a coating of at least one metal. The elastically deformable and compressible elastomer advantageously fits into the deformation 10, so that a large contact area is achieved at the ground contact 8.

[0055] FIG. 3 shows an embodiment of an electric motor 1 in perspective view. No suppression device 4, for example according to FIGS. 4a to 4c, is yet mounted on the motor 1. The housing 2 of the motor 1 is caulked to the brush cover 9 of the electric motor 1 in the region of four concave deformations 10 arranged over the circumference. The housing 2 is deformed in the direction of the brush cover 9 in order to cooperate in a form-fitting manner with the latter. A contact means 7 can engage in each of these deformations 10 and contact the housing 2 as a ground contact 8 after the suppression device 4 has been mounted. The terminal contacts 3 of the electric motor 1 protrude essentially vertically from the electric motor 1.

[0056] A suppression device 4, which can be mounted on an electric motor 1 according to FIG. 3, is shown by way of example in FIGS. 4a to 4c. FIG. 4a shows the suppression device 4 in a perspective view from below. Four contact means 7 are arranged on the circuit carrier 5 of the suppression device 4 at uniformly spaced intervals and are conductively soldered to the circuit carrier 5 in such a way that the contact means 7 are electrically connected to the filter circuit 6. The conductive paths connecting the components of the filter circuit 6 are not shown in FIGS. 4a to 4c. According to FIGS. 4a to 4c, before deformation during assembly, the contact means 7 have a substantially rectangular shape, with a width approximately twice the length and height. Each contact means 7 has one or two central recesses 11 which pass through the contact means 7 in the length direction. The contact means 7 are made of an elastomer and have an electrically conductive coating on their surface. The contact means 7 are elastically deformable and compressible.

[0057] The terminal contacts 3 according to FIG. 1 and FIG. 3 can be soldered to the circuit carrier 5 in receiving areas 12 of the circuit carrier 5 according to FIG. 4a to FIG. 4c, so that an electrical contacting of the filter circuit 6 is realized, whereby the filter circuit 6 is electrically connected between the terminal contacts 3, for example as according to FIG. 5. The circuit carrier 5 has a central recess 5b through which the components of the electric motor can pass in the assembly position - see FIG. 1.

[0058] FIG. 5 shows an embodiment of a filter circuit 6 as a circuit diagram. The filter circuit 6 can be connected to the terminal contacts 3 of the electric motor 1 via connecting areas 13a and 13b. The filter circuit 6 comprises three capacitances 14 and two inductances 15. The ground connection 16 is provided between two capacitances 14, which is connected to a ground contact 8 - according to FIG. 1 the housing 2 and the back iron 9 - of the electric motor 1 via the contact means 7 (see, for example, FIG. 1). The inductances 15 are arranged in series between the connecting areas 13a, 13b, and the capacitances 14 are arranged in parallel between the terminal contacts 13a, 13b.

[0059] FIG. 6 shows an embodiment of an electric motor 1 during assembly. The suppression device 4 is moved in a direction along the longitudinal axis L towards one end side of the electric motor 1 so that the terminal contacts 3 engage in the receiving areas 12 and the contact means 7 come to rest in the deformations 10 with as large a contact area as possible. In FIG. 6, the contact means 7 are not yet deformed or compressed and deform, for example according to FIG. 2, when the circuit carrier 5 is in its mounting position (see FIG. 1 and FIG. 2). In this embodiment, the circuit carrier 5 is attached to the electric motor 1 by soldering the terminal contacts 3 in the receiving areas 12.

[0060] FIG. 7 shows the schematic sequence of an embodiment of a method 100 for arranging an suppression device 4 against electromagnetic emissions on an electric motor 1. First, an electric motor 1 with at least two terminal contacts 3 is provided 101, in particular according to one of the embodiments described above. Further occurs the provision 102 of a suppression device 4 with at least one circuit carrier 5 and a filter circuit 6, for example according to FIG. 5, as well as at least one contact means 7. Subsequently, the moving 103 of the suppression device 4 into its mounting position (for example according to FIG. 1) on the electric motor 1 takes place with elastic deformation of the contact means 7 respectively the contact means 7 with simultaneous contacting of the contact means 7 respectively the contact means 7 with a ground contact 8, in this case for example the housing 2. Finally, the suppression device 4 is fixed 104 to the electric motor 1, for example by soldering the terminal contacts 3 in the receiving areas 12.

[0061] The invention is not limited to the embodiments shown and described, but also includes all embodiments having the same effect in the sense of the invention. It is expressly emphasized that the embodiments are not limited to all features in combination, rather each individual sub-feature may also have inventive significance in isolation from all other sub-features. Furthermore, the invention has not yet been limited to the combination of features defined in claim 1 either, but can also be defined by any other combination of certain features of all the individual features disclosed as a whole. This means that in principle virtually any individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application.