Method for protecting electrical connection between aluminum wire and winding of coil body

Abstract

A method for contacting a wire (1), in particular an aluminum wire, with a connecting body (4), in particular with a plug of a coil body (5), comprising the following steps: connecting the wire (1) materially to the connecting body (4) at at least one point (2, 3); after connecting, enclosing a connecting region including the at least at one point (2, 3) by a shrink tube (6) with an inner glue (7), the shrink tube (6) encompassing the connecting body (4).

Claims

1. A connecting arrangement of an electric pump motor, comprising an aluminum wire (1) of a winding (10) which is provided on a coil body (5), and a connecting body (4) for electrically connecting the winding (10) with an external electrical supply, wherein the aluminum wire (1) of the winding (10) is welded with the connecting body (4) by means of a bonding machine, the aluminum wire (1) being pressed against the connecting body (4) by a tool of the bonding machine and excited by the tool to ultrasonic vibrations to form at least one weld, and, wherein the at least one weld is enveloped by enveloping means comprising a shrink tube (6) having an inner glue (7), the shrink tube (6) enveloping the aluminum wire (1) and the connecting body (4) at the at least one weld and heated to shrink the shrink tube (6).

2. The connecting arrangement according to claim 1, wherein the connecting body (4) is in the form of a flat plug connected to the coil body (5).

3. The electric pump motor according to claim 2, wherein the wire (1) is welded to the connecting body (4) at least two times on a same flat side of the flat plug.

4. The connecting arrangement according to claim 1, wherein the inner glue (7) is provided between the connecting body (4) and the shrink tube (6).

5. The connecting arrangement according to claim 1, wherein at least one of a thermoplastic inner glue and an elastomer glue is provided as the inner glue (7).

6. The connecting arrangement according to claim 1, wherein a thermoplastic adhesive based on polyamide or an ethylene vinyl acetate based elastomeric adhesive is used as an inner glue (7) for the shrink tubing (6).

7. The connecting arrangement according to claim 1, wherein the at least one weld is more than one weld produced on a same flat side of the connecting body (4).

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) Further advantages, features and details of the invention can be taken from the further subclaims and the following description. Characteristics mentioned there can each be relevant to the invention individually or in any desired combination. Characteristics and details of the connection arrangement described in the invention are, of course, also related to the method according to the invention and vice versa. Thus, the disclosure to the individual aspects of the invention can always be referred to as reciprocal. The drawings are given by way of example only and are not intended to be limiting.

(2) FIG. 1 a first process step in the production of a connecting arrangement according to the invention,

(3) FIG. 2 the connection arrangement according to FIG. 1 in the finished state,

(4) FIG. 3 a second embodiment of the connecting arrangement according to the invention

(5) FIG. 4 a schematic illustration of an ultrasonic bonding machine and method.

DETAILED DESCRIPTION OF THE INVENTION

(6) According to a first embodiment of the invention according to FIGS. 1 and 2, a connection arrangement according to the invention for an electric pump motor is pro Vided, which provides two connection bodies 4, which are made in the manner of a flat plug of an electrically conductive material. As part of the connecting arrangement, an aluminum wire 1 is also provided which, on the one hand, forms a winding 10 and, on the other hand, is connected in two points 2, 3 on the connecting body 4. The connecting points 2, 3 designed for the materially, electrically conductive connection of the wire 1 to the connecting body 4 are produced in the present exemplary embodiment of the invention by means of an ultrasonic wire bonding machine. In this case, the wire 1 is pressed against the connecting body 4 by a tool of the bonding machine, and the tool is excited to ultrasonic vibrations. Due to the ultrasonic vibrations, the wire 1 connects materially with the connecting body 4.

(7) A securing of the wire 1 on the connecting body 4 according to FIG. 1 is achieved, in particular, before the bonding connection is produced, by winding the wire 1 around the connecting body 4 and positioning it in the region of two guide recesses 9, which are formed on two opposing narrow sides of the connecting body 4. The connecting points 2, 3 are provided on the same flat side of the connecting body 4 between the two guide recesses 9.

(8) After the electrical connection between the wire 1 and the connection body 4 has been established, a shrink tube 6 with a thermoplastic inner glue 7 is introduced in the region of the connecting points 2, 3, which electrically insulates and encapsulates the connection point (see FIG. 2). The shrink tube 6 thereby encompasses the connecting body 4 with the wire 1 as well as the thermoplastic inner glue 7. The shrink tube 6 is heated after the covering has been produced. In the region of a gap formed between the connecting body 4 on the one hand and the shrinking tube 6 on the other hand, a part of the thermoplastic internal glue 7 emerges (not shown).

(9) The two connecting bodies 4 are used for contacting the windings 10 supported by a coil body 5. In the present case, a further connecting body 8 is provided, which is not electrically contacted and remains non-functional in the illustrated embodiment.

(10) According to a second embodiment of the invention as shown in FIG. 3, in a second connecting arrangement of the coil body 5 with the two connecting bodies 4, the two connecting bodies 4 designed as a flat plug are provided in a same orientation, whereas in the first exemplary embodiment of the invention the two connecting bodies 4 have an orientation to each other turned by 90 .

(11) The invention is not limited to the embodiments discussed above and shown in the figures.

(12) For example, the integral connection of the wire 1 with the connecting body 4 can be produced by a welding process as a welded connection point or by a soldering method as a soldered joint.

(13) An elastomer adhesive can be provided as an internal adhesive and, in particular, an ethylene-vinyl acetate-based internal adhesive (ethylene-vinyl acetate copolymer).

(14) Identical components and component functions are identified by the same reference symbols.

(15) The invention is not limited to the embodiment shown here. In particular, the connecting body 4 can have a different geometry. Likewise, the method according to the invention is not limited to the ultrasonic bonding of aluminum wire 1.