DRIVE WITH A COMMUTATOR MOTOR

Abstract

A drive including a commutator motor having a motor housing, an end shield secured to the housing, feedthroughs defined in the end shield, brushes mounted in the feedthroughs; and at least one stranded conductor forming a direct electrical and mechanical connection between a brush and the terminal contact arranged outside the motor housing.

Claims

1. A drive electrically connected to a terminal contact, the drive comprising: a commutator motor having a motor housing and a motor axis; an end shield secured to the housing; feedthroughs defined in the end shield; brushes mounted in the feedthroughs; and at least one stranded conductor forming a direct electrical and mechanical connection between a brush and the terminal contact arranged outside the motor housing.

2. The drive according to claim 1, further comprising a conductor plate, wherein the terminal contact is arranged on the conductor plate.

3. The drive according to claim 2, wherein at least two brushes are electrically connected via a stranded conductor directly to the conductor plate or to the terminal contact on the conductor plate.

4. The drive according to claim 1, wherein each brush is a carbon brush and the stranded conductor is embedded in each brush.

5. The drive according to claim 1, wherein the terminal contact is an insulation displacement contact.

6. The drive according to claim 2, wherein the terminal contact has a press-in contact section which is pressed into a bore defined on the conductor plate.

7. The drive according to claim 2, wherein at least one stranded conductor is directly welded to the conductor plate.

8. The drive according to claim 2, wherein at least one stranded conductor is connected by a crimp connection to the conductor plate, or wherein the stranded conductor is crimped to the terminal contact.

9. The drive according to claim 3, wherein the terminal contact is a micro-quadlock plug crimped or welded to the stranded conductor.

10. The drive according to at least one of claims 1, wherein the end shield has a feedthrough for a stranded conductor, which feedthrough is aligned axially, diagonally, or radially.

11. The drive according to claim 1, wherein the end shield consists of an electrically insulating material.

12. The drive according to claim 11, wherein the brushes can be mounted radially from the outside.

13. The drive according to claim 10, wherein the feedthrough is a slot.

14. The drive according to claim 10, wherein the end shield additionally acts as a brush carrier plate.

15. The drive according to claim 14, wherein the feedthrough extends to a brush shaft for receiving and guiding the brush.

16. The drive according to claim 15, wherein the feedthrough includes a spring receiving pocket on the opposite side of the brush shaft.

17. The drive according to claim 2, wherein the conductor plate is arranged parallel to the motor axis.

18. The drive according to claim 17, wherein the brushes are aligned and guided parallel to the conductor plate and move parallel to the conductor plate as the brushes wear.

19. The drive according to claim 2, wherein the stranded conductor is guided around an edge of the conductor plate.

20. The drive according to claim 1, wherein the drive is a roller blind or a Venetian blind drive.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0021] An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. The following is shown:

[0022] FIG. 1 is a perspective view of a commutator motor according to the prior art,

[0023] FIG. 2 is a perspective view of a commutator motor according to the prior art connected to a conductor plate,

[0024] FIG. 3 is a perspective representation of two stranded conductors with their connections in an embodiment of the invention,

[0025] FIG. 4 is a perspective representation according to FIG. 3 with an end shield,

[0026] FIG. 5 is a sectional view of the end shield of FIG. 3,

[0027] FIG. 6 is an interior view of the end shield of FIG. 5; and

[0028] FIG. 7 is a partial representation of a drive with electric motor and conductor plate according to the present invention.

[0029] Note: The reference signs with index and the corresponding reference signs without index refer to details with the same name in the drawings and the drawing description. This reflects use in another embodiment or the prior art, and/or where the detail is a variant.

DETAILED DESCRIPTION OF THE INVENTION

[0030] In describing preferred embodiments of the present invention illustrated in the drawings, specific terminology is employed for the sake of clarity. However, the invention is not intended to be limited to the specific terminology so selected, and it is to be understood that each specific element includes all technical equivalents that operate in a similar manner to accomplish a similar purpose.

[0031] FIG. 1 shows a commutator motor 2a according to the prior art, with a motor housing 10a, an end shield 4a, and terminal lugs 11a. Conductor means can be soldered, welded, or slipped onto the terminal lugs. Feedthroughs 9a are provided through which brushes 5 can be mounted radially.

[0032] FIG. 2 shows a commutator motor 2b connected to a conductor plate 7b. Terminal contacts 8b having insulation displacement sections 12b are pressed into the conductor plate 7b. Flexible motor connecting lines 13b are inserted into the insulation displacement sections 12b and connected thereto electrically. Although the flexible motor connecting lines dampen vibrations of the commutator motor, the high number of contacts (brushconnecting lug, connecting lugmotor connecting line, motor connecting lineterminal contact, terminal contactconductor plate, etc.) increases electrical resistance and reduces electrical efficiency.

[0033] FIG. 3 shows a representation of two stranded conductors 6 with their connections. On one side, the stranded conductors 6 are embedded in brushes 5. In this case, the stranded conductors 6 are embedded by inserting them into a carbon powder material and pressing the material. In the process, a firm electrical and mechanical connection between the stranded conductor 6 and the brush 5 is produced. On the other side, the stranded conductors 6 are each inserted into an insulation displacement section 12 of a terminal contact 8 and electrically connected thereto. Press-in sections 14 are provided on the side of the terminal contact 8 facing away from the insulation displacement section 12 and pressed into a conductor plate, whereby an electrical contact is produced. Also illustrated is a brush pressure spring 15 in the form of a leg spring, which presses the brush 5 radially inwardly and constitutes a damping element 16. The described components are arranged in the correct position. For the sake of clarity, the end shield, the commutator motor, and the conductor plate are omitted.

[0034] FIG. 4 shows a representation according to FIG. 3 with end shield 4, which is shown in addition to the stranded conductors 6, the terminal contacts 8, and the damping element 16. The end shield 4 has feedthroughs 9 for the stranded conductors 6, the feedthroughs 9 being of slot-like design in order to give the stranded conductors 6 sufficient freedom of movement for feeding toward the wearing brushes. The feedthroughs 9 are axially expanded in the region of the brushes and thus form brush shafts 17 in which the brushes are radially guided and movable. The end shield 4 has an anti-rotation section 18 which can be inserted in a known manner between two magnet shells of a stator.

[0035] FIG. 5 shows a sectional view of the end shield 4, with the brush shafts 17, the brushes 5, the stranded conductors 6, the terminal contacts 8, the feedthroughs 9, the anti-rotation element, and the damping element 16 which is accommodated in an annular projection 19. The damping element 16 is axially secured in position by an annular extension 20.

[0036] FIG. 6 shows an interior view of the end shield 4, with the brush shafts 17, the anti-rotation section 18, the brushes, the brush pressure springs 15, the stranded conductors 6, and the terminal contacts 8.

[0037] FIG. 7 shows a partial view of a drive 1 with indicated electric motor 2 (dashed line), the end shield 4, and the conductor plate 7. In the end shield 4, the brushes 5 are aligned and guided such that they move in parallel to the conductor plate 7 in case of wear. As a result, the stranded conductors 6 can be guided to the conductor plate at right angles to the conductor plate. Subsequently, the stranded conductors 6 are laid around an edge of the conductor plate 7 and guided to the terminal contacts 8. The slot-like feedthrough 9 is expanded in order to receive the leg of the brush pressure spring 15. For easier mounting of the brushes 5, the leg of the brush pressure spring 15 can be stretched in the end shield and retained in its position in a form-fit manner until the brush is inserted (not shown). The conductor plate 7 carries components of an electrical control circuit for the roller blind and a connecting plug 20. Furthermore shown is the damping element 16 which is accommodated on the projection of the end shield 4.

[0038] Modifications and variations of the above-described embodiments of the present invention are possible, as appreciated by those skilled in the art in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims and their equivalents, the invention may be practiced otherwise than as specifically described.

LIST OF REFERENCE NUMBERS

[0039] 1 Drive [0040] 2 Commutator motor [0041] 3 Motor housing [0042] 4 End shield [0043] 5 Brush [0044] 6 Stranded conductor [0045] 7 Conductor plate [0046] 8 Terminal contact [0047] 9 Feedthrough [0048] 10 Motor housing [0049] 11 Connecting lug [0050] 12 Insulation displacement section [0051] 13 Motor connecting line [0052] 14 Press-in section [0053] 15 Brush pressure spring [0054] 16 Damping element [0055] 17 Brush shaft [0056] 18 Anti-rotation section [0057] 19 Projection [0058] 20 Connecting plug [0059] 21 Component [0060] 22 Spring receiving pocket