WO2021047307A1

WO2021047307A1 - Spot welding method for multi-layer conductor of motor winding

Info

Publication number: WO2021047307A1
Application number: PCT/CN2020/104583
Authority: WO
Inventors: 林中尉
Original assignee: 苏州阿福机器人有限公司
Priority date: 2019-09-12
Filing date: 2020-07-24
Publication date: 2021-03-18
Also published as: CN110560861A

Abstract

A spot welding method for a multi-layer conductor of a motor winding, comprising: a fluxing component facilitating welding adjacent two conductors together is provided between any two of at least three adjacent conductors which need to be welded together, two electrodes of an electric resistance welding device clamp all the conductors, and a welding current flows through all the conductors to weld the two conductors on both sides of the fluxing component together. The method implements rapidly and reliably welding any two adjacent conductors under a condition that multiple conductors are provided and a spacing between the adjacent conductors is small.

Description

Spot welding method for multi-layer conductor of motor winding

Technical field

The present invention relates to a conductor welding method for motor windings, in particular to a spot welding method for multilayer conductors of flat wire motor windings.

Background technique

With the improvement of the performance requirements of power motors, the winding has become a trend from round wires to flat wires, and the flat wire windings are mostly welded windings. The conventional method is to use electric welding on the end of the wire. This welding will cause the solder joints to heat up and solder joints. The strength is low, and the consistency of the conductive cross-sectional area is difficult to ensure (because the copper is recrystallized in the air to be a large crystal, the resistance of the large crystal is increased, and the brittleness is large); or spot welding between every two layers. But when the gap between the conductors of each layer is very small, the two electrodes in the spot welding equipment cannot be placed outside the two conductors that need to be welded, and the two conductors that need to be welded are directly clamped, causing the spot welding process to be in this situation Cannot work under.

Summary of the invention

The object of the present invention is to provide a spot welding method for a motor winding multilayer conductor that can quickly and reliably weld any two adjacent conductors when there are multiple conductors and the distance between adjacent conductors is small .

The spot welding method of the multilayer conductor of the motor winding of the present invention is arranged between any two adjacent conductors of at least three conductors that need to be welded together, which helps to weld the two adjacent conductors together. For the fluxing component, the two electrodes of the resistance welding equipment clamp all the conductors, the welding current flows through all the conductors, and the two conductors on both sides of the fluxing component are welded together.

As a further improvement to the above-mentioned spot welding method of the multilayer conductor of the motor winding, the fluxing member is a fluxing material.

As a further improvement to the above-mentioned spot welding method for multilayer conductors of motor windings, two conductors that need to be welded are provided with a bump that reduces the contact area between the two conductors and increases the contact resistance. The bump is Flux components.

A fluxing material is arranged between the bump and at least one of the two conductors to be welded, and the bump and the fluxing material are the fluxing members.

The bump is an integral structure with one of the two conductors to be welded, and the bump is a bump on the surface of the conductor itself. Or, the bump is independent of the two conductors that need to be welded, and is a separate structure from the two conductors that need to be welded.

The soldering material is flake solder or ribbon solder or cream solder.

As a further improvement to the above-mentioned spot welding method for a multilayer conductor of a motor winding, the fluxing member is a conductor with a fluxing material entrained.

As a further improvement to the spot welding method of the above-mentioned motor winding multilayer conductor, the conductor is a copper wire, and the welding member is made of a material that helps to weld the copper together, such as silver solder sheet, silver copper solder sheet , All kinds of copper alloy welding piece, amorphous welding piece, etc.

As a further improvement to the above-mentioned spot welding method for multilayer conductors of motor windings, conductors that are not welded to each other can be reliably contacted to reduce contact resistance.

As a further improvement to the above-mentioned spot welding method of the multilayer conductor of the motor winding, a transition conductor is arranged between the conductors that are not welded to each other to realize a reliable connection between the conductors to reduce the contact resistance.

The beneficial effect of this patent: as the conductor of the motor (usually copper material), the electrical conductivity is very strong. When using resistance welding welding, it is necessary to set the flux material (solder), bumps and them between the two target welding joint surfaces The combination of the flux or the conductive body with the flux material entrained in the welding components, so as to increase the resistance of the joint surface, the joint surface heats up when the power is applied, and the welding component and the conductor at the joint surface are melted to achieve welding. The contact surfaces of the conductors that are not provided with the soldering member will not be welded together because of the low resistance and low heat generation, and the conductors are not easy to melt. The invention utilizes this principle to realize spot welding of any two-layer conductors with a small multi-layer spacing. For multiple conductors arranged at intervals, set up a welding member on the joint surface of two adjacent conductors to be welded. During welding, use two electrodes to clamp all the conductors at the same time. Then the electrodes are energized and the current flows through the multiple conductors. Since the resistance at the soldering component is greater than other contact surfaces, the current generates a large amount of heat at the soldering component, which melts the soldering component and the conductor, so that the conductors can be welded together.

Flux materials (solder) belong to the prior art, and are a general term for metal alloy materials used to add to welds, surfacing layers and brazing joints, including welding wires, welding rods, and brazing materials. There are many types of solder, which can be divided into hard solder and soft solder according to different melting points; according to different composition, it can be divided into tin-lead solder, silver solder, copper solder, etc. In the soldering process, tin-lead alloy solder is generally used, tin-lead alloy solder is used for wire end soldering of motors of insulation grade A, B, and E, and pure tin solder is used for grade F and H. Solder is often processed and shaped according to the specified size when in use, and has various shapes such as sheet, block, rod, ribbon and wire. Flake solder (solder) is often used for welding silicon wafers and other flake welding parts. The solder slices are generally extruded, such as tin solder slices, silver solder slices, nickel solder slices, copper solder slices, and are mainly used for brazing. Welding. Ribbon solder is often used in the production line for automatically assembling chips. An automatic soldering machine is used to punch a section from the ribbon-shaped solder for soldering to improve production efficiency.

Between the conductors to be welded, a bump is provided as a welding member. The bump can be a bump of the conductor itself or an independent member. Its function is to reduce the contact area between the conductors and increase the contact area between the conductors. The contact resistance between the conductors, during welding, the heat generated by the electric energy will be mainly concentrated in the place where the resistance is large, so that the small contact area will quickly heat up, and then the melting connection will become a reliable solder joint. The protrusions are round, rectangular, ring-shaped or any other geometric shapes.

For this patent, the conductor is generally a copper wire with a rectangular cross-section, and the commonly used flux materials are sheet solder, ribbon solder or cream solder, including silver solder, silver copper solder, and various copper alloy solders. , Amorphous solder, and paste solder of corresponding material.

In order not to generate a lot of heat between conductors that do not need to be welded, the contact surfaces of the conductors that do not need to be welded should be reliably contacted, or a transition conductor should be set between conductors that are not welded to each other to achieve a reliable connection between the conductors to reduce contact resistance.

Description of the drawings

Figure 1 is a schematic diagram of spot welding a multilayer conductor of a motor winding;

Figure 2 is another schematic diagram of spot welding a multilayer conductor of a motor winding;

Figure 3 is another schematic diagram of spot welding the multilayer conductor of the motor winding;

Fig. 4 is another schematic diagram of spot welding a multilayer conductor of a motor winding.

Figure 5 is a schematic diagram of spot welding a multilayer conductor of a motor winding;

FIG. 6 is a bottom view of the conductor 11 or the conductor 14 in FIG. 5.

detailed description

Referring to the schematic diagram of the spot welding of the multilayer conductor of the motor winding shown in Figure 1, the

multiple copper conductors

11, 12, 13, 14, 15 extending from the iron core slot, their ends are in the diameter of the iron core In order to weld the conductor 11 and the conductor 12 and the conductor 14 and the conductor 15, the soldering material (solder) 2 is extended between the conductor 11 and the conductor 12, and between the conductor 14 and the conductor 15, and the two

electrodes

31, 32 clamp all the conductors in the radial direction of the iron core, reliable contact between the conductor 12 and the conductor 13, and between the conductor 13 and the conductor 14, the welding current flows through all the conductors, and will be used as the flux material 2 of the flux component. The conductor 11 and the conductor 12 and the conductor 14 and the conductor 15 on both sides are welded together.

In order to further reduce the contact resistance between the conductor 12 and the conductor 13, and between the conductor 13 and the conductor 14, see FIG. 2, a transition conductor (such as a conductive pad) is set between the conductor 12 and the conductor 13, and between the conductor 13 and the conductor 14. Piece) 4.

Referring to the schematic diagram of the spot welding of the multilayer conductor of the motor winding shown in Figure 3, the

multiple copper conductors

11, 12, 14, 15 extending from the iron core slot, their ends are in the radial direction of the iron core In order to weld the conductor 11 and the conductor 12, the conductor 14 and the conductor 15, the soldering material 2 is extended between the conductor 11 and the conductor 12, and between the conductor 14 and the conductor 15, and the two

electrodes

31, 32 are along the iron The core clamps all the conductors in the radial direction, the conductor 12 and the conductor 14 are in reliable contact, the welding current flows through all the conductors, and the conductor 11 and the conductor 12, and the conductor 14 and the conductor on both sides of the flux material 2 as the fluxing member 15 Welded together. In order to further reduce the contact resistance between the conductor 12 and the conductor 14, referring to FIG. 4, a transition conductor (such as a conductive gasket) 4 is provided between the conductor 12 and the conductor 14.

Of course, in addition to the fluxing material, the fluxing component can also be made of materials that help braze together, or it can be a multilayer conductor with fluxing material entrained.

The conductor may be two or more conductors that have been welded together.

Referring to the schematic diagrams of spot welding of multilayer conductors of motor windings shown in Figures 5 and 6, there are

multiple copper conductors

11, 12, 13, 14, 15 extending from the iron core slot, and their ends are in the iron core. The conductor 11 and the conductor 12, and the conductor 14 and the conductor 15 need to be welded. There are protrusions 6 on the end surfaces of the

conductors

11 and 14.

Extend the soldering material (solder) 2 between the bump 6 on the conductor 14 and the conductor 15. The two

electrodes

31, 32 clamp all the conductors along the radial direction of the iron core, and the bump 6 on the conductor 11 and the conductor 12 Contact, reliable contact between the conductor 12 and the conductor 13, and between the conductor 13 and the conductor 14. The bump 6 on the conductor 14 is in contact with the conductor 15 through the soldering material 2, and the welding current flows through all the conductors and will act as a soldering member The conductor 11 and the conductor 12 on both sides of the bump 6 are welded together, and the conductor 14 and the conductor 15 on both sides of the bump 6 as the soldering member and the soldering material 2 are soldered together.

The soldering component can also be any amount of solder or any material that helps to braze the brazing together, or it can be a multi-layer conductive structure with solder entrained. The structure, material, state, etc. of the soldering component are different. Affect the protection scope of the claims of the present invention.

Claims

A spot welding method for multi-layer conductors of motor windings is characterized in that: any two adjacent conductors of at least three conductors that need to be welded together are arranged to help weld the two adjacent conductors together. For the fluxing component, the two electrodes of the resistance welding equipment clamp all the conductors, the welding current flows through all the conductors, and the two conductors on both sides of the fluxing component are welded together.
4. The spot welding method for a multilayer conductor of a motor winding according to claim 1, wherein the fluxing member is a fluxing material.
The method for spot welding of multilayer conductors of motor windings according to claim 1, wherein the two conductors to be welded are provided with a bump that reduces the contact area between the two conductors and increases the contact resistance. The protrusion is a welding member.
The spot welding method of the motor winding multilayer conductor according to claim 3, characterized in that: a soldering material is provided between the bump and at least one of the two conductors to be welded, and the bump and the assistant The welding material is the welding component.
The spot welding method of the multilayer conductor of the motor winding according to claim 3, wherein the protrusion and one of the two conductors to be welded are an integral structure, and the protrusion is a protrusion on the surface of the conductor itself.
The spot welding method of the multilayer conductor of the motor winding according to claim 3, wherein the protrusion is independent of the two conductors to be welded, and is a separate structure from the two conductors to be welded.
4. The spot welding method for a multilayer conductor of a motor winding according to claim 1, wherein the fluxing member is a conductor with fluxing material entrained.
The spot welding method of the multilayer conductor of the motor winding according to claim 1, wherein the conductor is a copper wire, and the welding member is made of a material that helps to weld the copper together.
4. The spot welding method for multilayer conductors of motor windings according to claim 1, characterized in that: the conductors that are not welded to each other are in reliable contact to reduce the contact resistance.
4. The spot welding method for multilayer conductors of motor windings according to claim 1, characterized in that: transition conductors are arranged between conductors that are not welded to each other to achieve a reliable connection between the conductors to reduce contact resistance.