KR20170005481A - Aluminum wire-copper wire connection method and electric motor using this connection method - Google Patents

Abstract

(1) having cavities (6) and (7) capable of accommodating the press-fitting terminal (1), and a pressure contact terminal (1) in the cavities (6, 7) The aluminum terminals 3 and 4 are formed on one side 9a of the anvil by using an insulating member 2 having two anvils 9a and 9b corresponding to the two conductive grooves 1a and 1b, The terminal 5 of the copper wire is placed on the other side 9b of the anvil and the terminals 3 and 4 of the aluminum wire and the terminal 5 of the copper wire are inserted into the cavities 6 and 7 A method of connecting an aluminum wire and a copper wire which are connected by press-fitting into two conducting grooves 1a and 1b of a press-fitting terminal 1, The terminals 3 and 4 are press-fitted before the terminal 5 of the copper wire.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of connecting an aluminum wire to a copper wire, and an electric motor using the wire connection method.

The present invention relates to a method of connecting an aluminum wire and a copper wire, and an electric motor using the wire method.

Conventionally, for example, an aluminum wire is used as a winding of an electric motor mounted in a hermetic compressor, and a copper wire is used as a passive line, thereby reducing the cost. In such a case, the connection between the aluminum wire and the copper wire is performed by a pressure contact terminal having two electrically connecting grooves. That is, the terminal of the aluminum wire and the terminal of the copper wire are respectively press-fitted into the two conduction grooves juxtaposed on both sides of the central piece of the insulation displacement terminal. As a result, the respective conduction grooves of the pressure-contact terminals are widened, and the elastic force acts on the terminal of the aluminum wire and the terminal of the copper wire as the press-contact stress, thereby ensuring the reliability (for example, see Patent Document 1).

Patent Document 1: JP-A-2010-166643 (Fig. 5)

However, the following problems (1) and (2) exist in the case where the terminal of the aluminum wire and the terminal of the copper wire are connected by press-fitting into the two conductive grooves juxtaposed on both sides of the center piece of the insulation displacement terminal.

(1) Since the aluminum wire is lower in rigidity than the copper wire when the aluminum wire and the copper wire are pressed into one of the two interconnecting grooves juxtaposed on both sides of the central portion of the insulation displacement terminal, The entrance of the conduction groove into which the aluminum wire is press-fitted is narrowed, and the conduction groove into which the aluminum wire is press-fitted becomes a state in which the entrance is narrow and wide. The aluminum wire is deformed at the entrance of the conduction groove and presses into the inside of the conduction groove. Therefore, compared with the case where the copper wires are brought into pressure contact with each other, the pressure stress is lowered.

(2) When used in a device such as a hermetic compressor where the ambient temperature at the periphery of the wiring section increases during operation, stress relaxation is promoted by thermal creep. Therefore, the stress applied to the aluminum wire by the press-fit terminal decreases with the lapse of time. When the initial stress is low, the contact resistance becomes large due to the above-described aging, and in the worst case, it becomes non-conductive.

SUMMARY OF THE INVENTION The present invention has been achieved in order to solve the above problems, and it is an object of the present invention to provide a method of connecting an aluminum wire and a copper wire, and an electric motor using the wire method, which can secure long-term reliability in the case of connecting an aluminum wire and a copper wire. .

A method for connecting an aluminum wire and a copper wire according to the present invention is a method for connecting an aluminum wire and a copper wire, comprising a pressure-contact terminal in which two conduction grooves are juxtaposed and a cavity capable of accommodating the pressure-contact terminal, And a terminal of an aluminum wire is mounted on the other of the two anvils and the terminal of the aluminum wire is mounted on the other of the two anvils, And the terminal of the copper wire is pressed into each of the two conduction grooves of the press-fitting terminal accommodated in the cavity, the method comprising the steps of: connecting the aluminum wire and the copper wire to the two conduction grooves of the press- And the terminal of the wire is pressed before the terminal of the copper wire.

Further, an electric motor according to the present invention is an electric motor using an aluminum wire as a winding of a stator and a copper wire as a crossing line, and the connecting portion between the winding and the overhead conductor is formed by using the above-mentioned method of connecting the aluminum wire and the copper wire will be.

In the method of connecting the aluminum wire to the copper wire according to the present invention, the terminal of the aluminum wire is pressed in before the terminal of the copper wire in the two conduction grooves of the insulation displacement terminal. When the copper wire is first pressed into the conductive groove of the insulation displacement terminal, the entrance portion of the conductive groove on the aluminum wire side is narrowed, and the aluminum wire is deformed at the entrance portion and the hollow is wider than the entrance. However, the problem that the aluminum wire is first pressed into the conduction groove of the pressure-contact terminal and the copper wire is then inserted into the other conduction groove of the pressure-contact terminal later, . Further, it is possible to suppress the increase of the contact resistance with the pressure-contact terminal, and to secure long-term reliability against thermal creep.

Further, in the electric motor according to the present invention, since the connecting portion between the winding wire and the bypass line is provided with the connecting portion formed by the above-described method of connecting the aluminum wire and the copper wire, reliability can be easily secured.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a top view showing an electric motor using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention; FIG.
Fig. 2 is an exploded perspective view showing a wiring section using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention; Fig.
3 is a cross-sectional view showing the relationship between an anvil height of a wiring portion and two conduction grooves of an insulation displacement terminal using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention.
Fig. 4 is an explanatory diagram of a method of obtaining a dimension at which an aluminum wire of a wiring portion using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention makes contact with an insulation displacement terminal before a copper wire.
Fig. 5 is a cross-sectional view showing the relationship between an anvil height of a wire connecting section and a wire diameter and two conduction grooves of a crimp terminal according to a second embodiment of the present invention; Fig.
Fig. 6 is an explanatory diagram of two electric conduction grooves of an insulation displacement terminal of a wiring section using a wiring method of an aluminum wire and a copper wire according to a third embodiment of the present invention; Fig.

Embodiment Mode 1.

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

1 is a top view showing an electric motor using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention. 2 is an exploded perspective view showing a wiring section using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention. Fig. 3 is a cross-sectional view showing the relationship between an anvil height of a wiring section and two conduction grooves of an insulation displacement terminal using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention. Fig.

As shown in Fig. 1 to Fig. 3, the wire connecting portion using the method of connecting the aluminum wire and the copper wire according to the first embodiment of the present invention has a cross section of one side of the stator core 10 End face). That is, the wiring section includes the pressure-insulated terminal 1 in which the central piece portion 1c is sandwiched and the two conduction grooves 1a and 1b are juxtaposed, and the cavity 6 , And 7).

The cavities 6 and 7 are provided with two conductive constraint grooves 8a and 8b, respectively. The anvil 9 corresponding to the two conductive grooves 1a and 1b of the insulation displacement terminal 1 protrudes upward from the bottom surface in the conductive line restraining grooves 8a and 8b. The anvil 9 is connected to the aluminum side anvil 9a on which the terminal of the aluminum wire, that is, the winding start terminal 3 of the winding or the winding end terminal 4 of the winding is mounted, Side anvil 9b on which the line 5 is placed. The projecting height of the aluminum side anvil 9a is formed to be higher than the projecting height of the copper line side anvil 9b. As a result, the terminals of the aluminum wire (the winding start terminal 3 of the winding wire and the winding end terminal 4 of the winding wire) are connected to the terminals 5)).

Next, a wiring method of the aluminum wire and the copper wire according to the first embodiment of the present invention will be described with reference to Figs. 1 to 3. Fig.

First, the winding start terminal 3 of the aluminum wire, that is, the winding winding end terminal 4 of the winding wire, and the copper wire or the stranded wire 5 are arranged on the cavities 6 and 7. Subsequently, from the tops of these terminals or the passageways (hereinafter collectively referred to as " conductors "), pressure-welding with electric conduction grooves 1a and 1b set to a width smaller than the wire diameter of these conductors The terminals 1 are pushed into the cavities 6 and 7 toward the respective conductors through the conduction grooves 1a and 1b. At this time, the winding start terminal 3 of the aluminum wire or winding, the winding end terminal 4 of the winding, and the copper wire, that is, the pass line 5 are connected to the lead wire restraining grooves 8a and 8b provided in the cavities 6 and 7 , And the insulating layer is removed by the edges of the conductive grooves 1a and 1b of the insulation displacement terminal 1. [ As a result, the winding start terminal 3 of the winding wire, winding end terminal 4 of the winding, and the stranded wire 5 of the copper wire become conductive.

The height of the anvil 9 is changed so that the aluminum wire is press-fitted into the insulation displacement terminal 1 before the copper wire and the height of the aluminum side-side anvil 9a is set to be higher than the height of the copper- (9b) so that the copper wire having higher rigidity than the pressure-contacting terminal (1) is pressed into the conduction groove (1b) after the aluminum line. In other words, the press-in depth into the conduction groove 1b of the copper wire having higher rigidity than that of the pressure-contacting terminal 1 becomes shallower than the press-in depth of the aluminum wire into the conduction groove 1a. As a result, the pressure stress on the aluminum wire side can be increased by the pressing force of the aluminum wire on the electric conduction groove 1a caused by the widening of the electric conduction groove 1b of the pressure-contact terminal 1 by press-fitting of the copper wire , It is possible to suppress an increase in contact resistance. This makes it possible to ensure long-term reliability of connection between the insulation displacement terminal 1 and the aluminum wire, that is, between the winding start terminal 3 of the winding and the winding end terminal 4 of the winding, for thermal creep. An electric motor having a connection portion between a winding wire and a crossing line formed by using the above-described connection method of an aluminum wire and a copper wire can improve the reliability.

Fig. 4 is an explanatory diagram of a method for determining the dimension at which an aluminum wire of a wiring portion using a wiring method of an aluminum wire and a copper wire according to Embodiment 1 of the present invention makes contact with an insulation displacement terminal before a copper wire.

4, the height from the lower surface of the cavities 6 and 7 of the insulation displacement terminal 1 to the upper surface of the aluminum side-side anvil 9a is A and the height from the lower surface of the cavities 6 and 7 of the insulation displacement terminal 1 to the copper line side The height to the top surface of the anvil 9b is B, the diameter of the aluminum wire is φC, and the diameter of the copper wire is φD. When the height of the anvil is set to A-B > D-C, the aluminum wire comes into contact with the insulation displacement terminal before the copper wire, since the difference in elevation between the anvil and the copper wire is (? C-? D).

Embodiment 2:

Fig. 5 is a cross-sectional view showing the relationship between the anvil height of the wire connecting section and the two conduction grooves of the wire diameter and the press-fit terminal according to the second embodiment of the present invention using the wire method of the aluminum wire and the copper wire, The same parts as those of the first embodiment are denoted by the same reference numerals. In the description, the above-mentioned FIG. 2 will be referred to.

In the first embodiment described above, the height of the anvil 9 provided in the cavities 6, 7 is made different so that the aluminum wire is press-fitted into the connection groove 1a of the insulation displacement terminal 1 before the copper wire, The increase of the contact resistance between the terminal 1 and the aluminum wire can be suppressed and long-term reliability can be ensured.

In the second embodiment, the aluminum wire is pressed into the conductive groove 1a of the insulation displacement terminal 1 before the copper wire by making the wire diameter of the copper wire smaller than the wire diameter of the aluminum wire, The increase in contact resistance can be suppressed and long-term reliability can be ensured.

That is, as shown in Fig. 5, the wiring portions using the wiring method of the aluminum wire and the copper wire according to the second embodiment of the present invention are provided with the lead wire restraining grooves 8a and 8b The height of the aluminum side anvil 9a and the height of the copper line side anvil 9b are both set to the same height. Here, the wire diameter of the aluminum wire, that is, the winding start terminal 3A of the winding wire and the winding ending terminal 4A of the winding wire is larger than the wire diameter of the copper wire, that is, the cross wire 5.

Next, a wiring method of the aluminum wire and the copper wire according to the second embodiment of the present invention will be described with reference to Figs. 5 and 2. Fig.

First, the winding start terminal 3A of the aluminum wire, the winding winding end terminal 4A of the winding wire, and the copper wire or the stranded wire 5 are arranged on the cavities 6 and 7. The insulation displacement terminals 1 having the conductive grooves 1a and 1b set to a width smaller than the wire diameter of these conductive wires are formed in such a manner that the conductive grooves 1a and 1b are connected to the cavities 6 , 7). At this time, the winding start terminal 3A of the aluminum wire, that is, the winding winding end terminal 4A of the winding, and the copper wire, that is, the runner wire 5 are connected to the lead wire restraining grooves 8a and 8b provided in the cavities 6 and 7 , And the insulating layer is removed by the edges of the conductive grooves 1a and 1b of the insulation displacement terminal 1. [ As a result, the winding start terminal 3A of the winding wire, winding end terminal 4A of the winding, and the stranded wire 5 of the copper wire become conductive.

Further, the wire diameter of the aluminum wire is made larger than the wire diameter of the copper wire, like the wire portion using the wire method of the aluminum wire and the copper wire according to the second embodiment of the present invention, so that the aluminum wire is first pressed into the conduction groove 1a . In other words, the indentation depth of the aluminum wire into the conductive groove 1a is made deeper than that of the copper wire. As a result, the problem that the aluminum line is deformed at the inlet for the conduction groove and the pressure stress is lowered can be solved. It is also possible to suppress the increase of the contact resistance with the press-fit terminal 1 and to prevent the thermal creep from occurring in the connection between the press-fit terminal 1 and the winding start terminal 3A of the aluminum wire, The long-term reliability can be secured. In addition, the copper wire has a resistivity 1/3 of that of the aluminum wire, so that the allowable current is not affected if the wire diameter is 1/3 or more of the aluminum wire.

Embodiment 3

Fig. 6 is an explanatory diagram of two connection groove shapes of the insulation displacement terminal of the wiring section using the wiring method of the aluminum wire and the copper wire according to the third embodiment of the present invention. In the same figure as the first embodiment, And are denoted by the same reference numerals. In the description, it is also assumed that the above-mentioned FIG. 2 is referred to.

In the third embodiment, the two connection grooves 1d and 1e provided on both sides of the central piece 1c of the insulation displacement terminal 1 are formed such that the groove width of the inlet portion is larger than the wire diameter of the aluminum wire or copper wire, Is formed so that the groove width gradually decreases from the inlet portion to the fastener side to suppress the increase in the contact resistance between the pressure contact terminal 1 and the aluminum wire and to secure long term reliability To be able to do.

That is, as shown in Fig. 6, the connection portion using the connection method of the aluminum wire and the copper wire according to the third embodiment of the present invention has the groove width of the connection groove 1d, 1e of the insulation displacement terminal 1 , All of which are configured to be smaller as the indentation depth becomes deeper.

Next, a wiring method of the aluminum wire and the copper wire according to the third embodiment of the present invention will be described with reference to Figs. 6 and 2. Fig.

First, the winding start terminal 3 of the aluminum wire, that is, the winding winding end terminal 4 of the winding wire, and the copper wire or the stranded wire 5 are arranged on the cavities 6 and 7. Subsequently, from the tops of these conductors, the insulation displacement terminals 1 having the conduction grooves 1d and 1e configured such that the groove width becomes smaller as the indentation depth becomes deeper are formed by connecting the conduction grooves 1d and 1e to the respective conductors 1d and 1e, Into the cavities (6, 7). At this time, the winding start terminal 3 of the aluminum wire or winding, the winding end terminal 4 of the winding, and the copper wire, that is, the pass line 5 are connected to the lead wire restraining grooves 8a and 8b provided in the cavities 6 and 7 , And the insulating layer is removed by the edges of the conductive grooves 1d and 1e of the insulation displacement terminal 1. [ As a result, the winding start terminal 3 of the winding wire, winding end terminal 4 of the winding, and the stranded wire 5 of the copper wire become conductive.

In the third embodiment of the present invention, the two interconnecting grooves 1d and 1e provided on the insulation displacement terminal 1 are formed so that the groove width of the interconnecting groove inlet is wider than the line diameter of the aluminum line or the copper line, Even when the center piece portion 1c of the press-fitting terminal 1 is inclined to the side of the aluminum line when the copper wire is press-fitted into the press-fitting terminal 1, the groove width of the conduction groove is set to be smaller than that of the aluminum wire or copper wire, It is possible to suppress the reduction of the stress applied to the press-fit terminal 1 and the aluminum wire.

The shape of the two interconnecting trenches 1d and 1e of the third embodiment may be provided only on the side of the interconnecting trench 1d into which the aluminum wire is inserted. In this case, as in Embodiment 3, if the height of the aluminum side anvil 9a is equal to the height of the copper line side anvil 9b, and the line diameter of the aluminum wire and the wire diameter of the copper wire are the same, Is pressed into the conduction groove 1e of the terminal 1, and the entrance portion of the conduction groove 1d on the aluminum wire side is narrowed. However, as described above, since the groove width of the inlet portion on the side of the conduction groove 1d into which the aluminum wire is press-fitted is formed larger than the wire diameter of the aluminum wire in advance, the aluminum wire is large in the entrance portion on the side of the conduction groove 1d No such thing as deforming.

The shape of the two interconnecting trenches 1d and 1e of the third embodiment or the shape in which the groove width gradually decreases from the entrance of the interconnecting trench 1d on which the aluminum wire is inserted to the side of the interconnecting trench 1d , The aluminum wire may be fitted into the connection groove 1a of the insulation displacement terminal 1 before the copper wire as in the first and second embodiments described above.

1:
1a, 1b, 1d, 1e:
1c: central portion
2: Insulation member
3, 3A: Winding winding start terminal (terminal of aluminum wire)
4, 4A: winding end terminal of winding (terminal of aluminum wire)
5: Passed line (terminal of copper line)
6, 7: Cavity
8a and 8b:
9: Anvil
9a: Aluminum side anvil
9b: Copper side anvil
10: stator iron core
A: Height from the lower surface of the cavity of the insulation displacement terminal to the upper surface of the aluminum side anvil
B: Height from the lower surface of the cavity of the insulation displacement terminal to the upper surface of the copper anchor
φC: Line diameter of aluminum wire
φD: wire diameter of copper wire

Claims (6)

And an insulation member having a pressure contact terminal in which two conduction grooves are provided and a cavity in which the pressure contact terminal can be housed and in which two anvils corresponding to the two conduction grooves of the pressure contact terminal are projected ,
Placing a terminal of an aluminum wire on one of the two anvils and placing a terminal of a copper wire on the other of the two anvils and attaching the terminal of the aluminum wire and the terminal of the copper wire to the pressure welding A method of connecting an aluminum wire and a copper wire to each other by press-fitting each of the two conduction grooves of the terminal,
And the terminal of the aluminum wire is pressed into the two conductive grooves of the press-fitting terminal before the terminal of the copper wire. The method according to claim 1,
The projecting height of the anvil where the terminal of the aluminum wire is placed is A, the projection height of the anvil where the terminal of the copper wire is placed is B, the wire diameter of the aluminum wire is φC and the wire diameter of the copper wire is φD, the terminal of the aluminum wire is press-fitted into the press-fitting terminal before the terminal of the copper wire is set. The method according to claim 1,
Wherein the terminal of the aluminum wire is larger than the wire diameter of the terminal of the copper wire so that the terminal of the aluminum wire is pressed into the insulation displacement terminal before the terminal of the copper wire. 4. The method according to any one of claims 1 to 3,
At least the interconnecting groove on the side where the terminal of the aluminum wire is press-fitted in the two interconnecting grooves provided in the press-fitting terminal is larger than the line width of the aluminum line at the entrance portion and the line width of the interconnecting portion is smaller than the line diameter of the aluminum line And the groove width is gradually reduced from the inlet portion to the side of the spiral portion. And an insulation member having a pressure contact terminal in which two conduction grooves are provided and a cavity in which the pressure contact terminal can be housed and in which two anvils corresponding to the two conduction grooves of the pressure contact terminal are projected ,
Placing a terminal of an aluminum wire on one of the two anvils and placing a terminal of a copper wire on the other of the two anvils and attaching the terminal of the aluminum wire and the terminal of the copper wire to the pressure welding A method of connecting an aluminum wire and a copper wire to each other by press-fitting each of the two conduction grooves of the terminal,
At least the interconnecting groove on the side where the terminal of the aluminum wire is press-fitted in the two interconnecting grooves provided in the press-fitting terminal is larger than the line width of the aluminum line at the entrance portion and the line width of the interconnecting portion is smaller than the line diameter of the aluminum line , The groove width is gradually reduced from the inlet portion to the fastener side,
And the terminal of the aluminum wire is press-fitted into the two connecting grooves of the press-fitting terminal simultaneously with or after the terminal of the copper wire. As an electric motor using an aluminum wire as a winding of a stator and a copper wire as a crossing line,
Wherein the connecting portion between the winding and the overhead conductor is formed by the method of connecting the aluminum wire and the copper wire according to any one of claims 1 to 5. An electric motor using the wiring method of an aluminum wire and a copper wire.

Images