Busbar aiming at three-phase three-branch winding and with circumferentially and uniformly distributed outgoing lines

Abstract

The invention discloses a busbar for a three-phase three-branch winding and with circumferentially and uniformly distributed outgoing lines, and the busbar comprises three groups of phase connecting lines, each group of phase connecting lines comprises three phase connecting lines, and two ends of each phase connecting line are respectively provided with a first welding end and a second welding end; the neutral outgoing line is in a major arc shape and is wound on the periphery of the three groups of phase connecting lines, and nine neutral welding ends are arranged at the two ends of the neutral outgoing line; the insulating layer covers the surface of the neutral outgoing line; and the connecting structure is used for fixing the first welding end, the second welding end and the neutral outgoing line. According to the invention, only the neutral lead-out wire is covered with the insulating layer, and then the first welding end, the second welding end and the neutral lead-out wire are fixed through the connecting structure, so that the structure is simple, production materials are few, and the cost can be effectively saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor structures, and specifically relates to a bus bar for a three-phase three-branch winding with circumferentially evenly distributed lead wires. Background Art

[0002] With the gradual development of motor assemblies towards miniaturization and integration, flat wire motors are increasingly favored due to their outstanding high slot fill factor and high power density. In order to convert electrical energy into magnetic energy, the stator needs to be connected to three-phase electricity. And in order to reduce the AC resistance of each phase, the number of parallel branches of the coils in each phase is usually increased. At this time, a bus bar is required to connect multiple parallel branches to achieve current input and shunting. The existing bus bars mainly consist of a neutral lead wire and three-phase connection wires. The connection methods include two-way parallel, three-way parallel, and four-way parallel to correspond to the number of parallel branches of the coils in each phase of the stator winding.

[0003] For a three-phase three-branch winding, in order to ensure the balance between winding branches and reduce the types of winding shapes, thereby reducing the cost of the shape molds, the lead wires of the coils often need to be circumferentially evenly distributed, and the bus bar paired with them also needs to correspond to the positions of the lead wires of the coils. As a result, the structure of the bus bar is complex and the cost is high. The existing three-phase connection wire rows and neutral lead wire rows of the bus bar usually adopt stamping copper bars, and then are injection-molded with insulation for fixation. The injection molding process is complex, the qualified rate is low, a large amount of plastic is used, and the cost is also high. Summary of the Invention

[0004] The purpose of the present invention is to provide a bus bar for a three-phase three-branch winding with circumferentially evenly distributed lead wires to solve at least one of the above technical problems.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A bus bar for a three-phase three-branch winding with circumferentially evenly distributed lead wires, comprising:

[0007] Three groups of phase connection wires, each group of the phase connection wires includes three of the phase connection wires. The two ends of the phase connection wires are respectively set as a first welding end and a second welding end, and the first welding end is welded to the leading-out wire of the head end of the corresponding coil in the three-phase three-branch winding;

[0008] A neutral lead wire, which is in a superior arc shape and is wound around the outer periphery of the three groups of phase connection wires. Nine neutral welding ends are arranged at both ends of the neutral lead wire, and the neutral welding ends are welded to the leading-out wires of the tail ends of the corresponding coils in the three-phase three-branch winding;

[0009] An insulating layer, covering the surface of the neutral lead wire;

[0010] A connection structure fixes the first welding end, the second welding end and the neutral lead-out wire.

[0011] In the present invention, only the neutral lead-out wire is covered with an insulating layer, and then the first welding end, the second welding end and the neutral lead-out wire are fixed through the connection structure. The structure is simple, the production materials are less, and the cost can be effectively saved.

[0012] Further, the phase connection wire is an enameled wire, which can play an insulating role. There is no need to inject insulation on the phase connection wire, which can reduce the amount of plastic used, save costs, and can also simplify the injection mold and improve the injection qualification rate.

[0013] Further, the neutral lead-out wire is a stamped copper busbar, which is convenient for welding with the tail lead-out wire of the corresponding coil in the three-phase three-branch winding.

[0014] Further, the nine neutral welding ends are evenly distributed in a ring, adapting to the positions of the tail lead-out wires of the corresponding coils in the three-phase three-branch winding.

[0015] Further, the nine first welding ends are evenly distributed in a ring, adapting to the positions of the head lead-out wires of the corresponding coils in the three-phase three-branch winding.

[0016] Further, the first welding end is located above the neutral lead-out wire, which is convenient for welding with the head lead-out wire of the corresponding coil in the three-phase three-branch winding.

[0017] Further, the three second welding ends of each group of phase connection wires are centrally arranged, which is convenient for the second welding end to be electrically connected to other devices. And the three phase connection wires of each group extend in a common circle, and the three first welding ends are evenly distributed in a ring.

[0018] Further, two of the phase connection wires in the same group are at the same horizontal height, and are coiled in a reverse direction along the ring from their second welding ends to the first welding ends;

[0019] The remaining one phase connection wire is located above one of the other two phase connection wires, and the angle between its first welding end and the corresponding second welding end is not greater than 40°. Through this coiling method, the space can be maximally saved. The three phase connection wires in the same group only need to be coiled in two layers, and the three groups of phase connection wires only need to be coiled in three circles in the horizontal direction in total, which is beneficial to the miniaturization of the motor; the angle between the first welding end and the corresponding second welding end of the phase connection wire located in the upper layer is not greater than 40° can minimize the length of this phase connection wire, which can reduce the amount of phase connection wire used and save costs.

[0020] Further, the three sets of phase connection lines are concentrically coiled and arranged in sequence along their diameter directions. Among them, the second welding ends of the set of phase connection lines located on the outermost or innermost circumference are circumferentially located between the second welding ends of the remaining two sets of phase connection lines, which can separate the three sets of second welding ends while minimizing the length of the upper-layer phase connection lines, facilitating the welding of the three sets of second welding ends to other circuits;

[0021] The three sets of second welding ends are integrally located between three adjacent first welding ends, which is convenient to fix the three sets of second welding ends together through a connection structure, can enhance the structural strength of the busbar, and save the amount of plastic used.

[0022] Further, the insulating layer is arranged in a circumferential closed loop, and the connection structure is integrally injection-molded with the insulating layer. The connection structure includes:

[0023] A first connecting member for connecting the first welding end and the phase connection line at the first welding end to the insulating layer;

[0024] A second connecting member for connecting the three sets of second welding ends, the phase connection lines at the second welding ends, the first connecting members adjacent to the second welding ends, and the insulating layer together;

[0025] An arc-shaped connecting member for connecting the two first connecting members located at both ends of the neutral lead-out wire. The provided connection structure is used to fix the first welding end and the second welding end to the neutral lead-out wire, which can enhance the structural strength of the busbar.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) In the present invention, by setting the three sets of phase connection lines as enameled wires and utilizing the self-insulating characteristics of the enameled wires, it is not necessary to integrally injection-mold and insulate the three sets of phase connection lines and the neutral lead-out wire. With the provided connection structure to fix the first welding end and the second welding end to the neutral lead-out wire, only the neutral lead-out wire needs to be injection-molded and insulated, and the connection structure needs to be injection-molded. Only partial injection-molding is required, which greatly simplifies the injection mold, improves the injection qualification rate, makes full use of the self-insulation of the enameled wire, and reduces the requirements for injection-molding;

[0028] (2) By providing enameled wires as phase connection wires, the present invention can utilize the bare copper ends of the enameled wires (i.e., the first welding part and the second welding part) for positioning in the injection mold. Therefore, one enameled wire of each phase can be placed on the second layer in the height direction, which simplifies the forming of the enameled wires, reduces the number of bends and the damage to the insulation caused by bending, and also reduces the cost of the bending tooling. This also makes the three phase connection wires in the same group on the same pitch circle radius, greatly simplifies the design of the injection mold for positioning them, is more conducive to ensuring the qualified rate, and also reduces the plastic consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. is a schematic structural diagram of a busbar for a three-phase three-branch winding with circumferentially evenly distributed lead-out wires in this embodiment;

[0030] Figure 2 FIG. is a schematic structural diagram of the phase connection wire and the neutral lead-out wire in this embodiment;

[0031] In the figure: 1, phase connection wire; 101, first welding end; 102, second welding end; 2, neutral lead-out wire; 201, neutral welding end; 3, insulating layer; 4, connection structure; 401, first connecting member; 402, second connecting member; 403, arc-shaped connecting member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] As Figure 1 and Figure 2 shown, this embodiment provides a busbar for a three-phase three-branch winding with circumferentially evenly distributed lead-out wires, including: three groups of phase connection wires 1, neutral lead-out wires 2, insulating layers 3, and connection structures 4.

[0034] Each group of the connecting wiring 1 includes three connecting wirings 1 (that is, three connecting wirings 1 form a group), and the two ends of the connecting wiring 1 are respectively set as a first welding end 101 and a second welding end 102, and the first welding end 101 is welded to the head end lead wire of the corresponding coil in the three-phase three-branch winding to realize the input of the three-phase three-branch winding current. The connecting wiring 1 is an enameled wire, which can play an insulating role. There is no need to injection-mold insulation on the connecting wiring 1, which can reduce the amount of plastic used, save costs, and simplify the injection mold to improve the injection molding qualification rate; the nine first welding ends 101 are evenly distributed in a ring shape, adapted to the position of the head end lead wire of the corresponding coil in the three-phase three-branch winding; each group of the connecting wiring 1 The three second welding ends 102 are centrally arranged to facilitate the electrical connection of the second welding ends 102 with other devices, and the three connecting wires 1 in each group extend in a common circle, and the three first welding ends 101 are evenly distributed in a ring shape; two of the connecting wires 1 in the same group are located at the same horizontal height, and are reversely coiled along the ring from their second welding ends 102 to the first welding end 101; the remaining connecting wire 1 is located above one of the other two connecting wires 1, and the angle between its first welding end 101 and the corresponding second welding end 102 is not greater than 40°, and the angle between the first welding end 101 and the corresponding second welding end 102 refers to the first welding end 101 of a connecting wire 1 1 to the center of the circle where the connecting wire 1 is wound and the angle between the second welding end 102 of the connecting wire 1 and the center of the circle where the connecting wire 1 is wound. Through this winding method, space can be saved to the maximum extent. The three connecting wires 1 in the same group only need to be wound in two layers, and the three groups of connecting wires 1 only need to be wound in three circles in the horizontal direction, which is conducive to the miniaturization of the motor; the angle between the first welding end 101 of the connecting wire 1 located in the upper layer and the corresponding second welding end 102 is not greater than 40°, which can shorten the length of the connecting wire 1 as much as possible, reduce the amount of the connecting wire 1, and save costs; the three groups of connecting wires 1 are concentrically wound and arranged in sequence along the diameter direction, wherein the group located at the outermost periphery The second welding end 102 of the connecting wiring 1 is circumferentially located between the second welding ends 102 of the remaining two groups of the connecting wiring 1. Preferably, the second welding end 102 of the innermost group of the connecting wiring 1 is circumferentially located between the second welding ends 102 of the remaining two groups of the connecting wiring 1. Under the premise of shortening the length of the upper connecting wiring 1 as much as possible, the three groups of second welding ends 102 can be separated, which is convenient for welding the three groups of second welding ends 102 with other lines; the three groups of second welding ends 102 are integrated between the three adjacent first welding ends 101, which is convenient for fixing the three groups of second welding ends 102 together through the connecting structure 4, which can enhance the structural strength of the bus and save the amount of plastic.

[0035] The neutral lead wire 2 is in a superior arc shape and is wound around the outer periphery of the three groups of the phase connection wires 1. Nine neutral welding terminals 201 are arranged at both ends of the neutral lead wire 2. The neutral welding terminals 201 are welded to the tail lead wires of the corresponding coils in the three-phase three-branch winding to realize the output of the current of the three-phase three-branch winding. The neutral lead wire 2 is a stamping copper bar, which is convenient for welding with the tail lead wires of the corresponding coils in the three-phase three-branch winding. The nine neutral welding terminals 201 are evenly distributed in a ring shape to adapt to the positions of the tail lead wires of the corresponding coils in the three-phase three-branch winding.

[0036] The insulating layer 3 covers the surface of the neutral lead wire 2; the insulating layer 3 is arranged in a circumferential closed loop.

[0037] The connecting structure 4 fixes the first welding terminal 101, the second welding terminal 102 and the neutral lead wire 2; the connecting structure 4 is integrally injection-molded with the insulating layer 3. The connecting structure 4 includes:

[0038] The first connecting member 401 is used to connect the first welding terminal 101 and the phase connection wire 1 at the first welding terminal 101 to the insulating layer 3.

[0039] The second connecting member 402 is used to connect the three groups of the second welding terminals 102, the phase connection wires 1 at the second welding terminals 102, the first connecting member 401 adjacent to the second welding terminal 102 and the insulating layer 3 together.

[0040] The arc-shaped connecting member 403 is used to connect the two first connecting members 401 located at both ends of the neutral lead wire 2. By arranging the connecting structure 4 to fix the first welding terminal 101 and the second welding terminal 102 to the neutral lead wire 2, the structural strength of the busbar can be enhanced.

[0041] In the present invention, only the neutral lead wire 2 is covered with the insulating layer 3, and then the first welding terminal 101 and the second welding terminal 102 are fixed to the neutral lead wire 2 through the connecting structure 4. The structure is simple, the production materials are less, and the cost can be effectively saved.

[0042] Furthermore, the first welding terminal 101 is located above the neutral lead wire 2, which is convenient for welding with the head lead wires of the corresponding coils in the three-phase three-branch winding.

[0043] Specifically, the three sets of phase connection lines 1 are respectively a set of U-phase connection lines, a set of W-phase connection lines, and a set of V-phase connection lines, which are correspondingly connected to the U-phase winding, the W-phase winding, and the V-phase winding in the three-phase winding. The U-phase winding includes three parallel-connected coils, the W-phase winding includes three parallel-connected coils, and the V-phase winding includes three parallel-connected coils. The set of U-phase connection lines includes a first U-phase connection line, a second U-phase connection line, and a third U-phase connection line. The set of W-phase connection lines includes a first W-phase connection line, a second W-phase connection line, and a third W-phase connection line. The set of V-phase connection lines includes a first V-phase connection line, a second V-phase connection line, and a third V-phase connection line.

[0044] It should be noted that although the present invention is disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is subject to the scope defined by the claims.

Claims

1. A busbar for three-phase three-branch windings with evenly distributed lead wires, characterized in that: include: Three groups of connected wiring, each group of the connected wiring includes three connected wirings, two ends of the connected wiring are respectively set as a first welding end and a second welding end, the first welding end is welded to the first end lead wire of the corresponding coil in the three-phase three-branch winding; A neutral lead wire, which is in an excellent arc shape and is wound around the periphery of the three groups of connected wirings, and the neutral lead wire includes nine neutral welding ends at both ends, and the neutral welding ends are welded to the tail lead wires of the corresponding coils in the three-phase three-branch winding; An insulating layer covering the surface of the neutral lead wire; A connecting structure fixes the first welding end, the second welding end and the neutral lead wire.

2. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 1, characterized in that: The connecting wires are enameled wires.

3. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 1, characterized in that: The neutral lead is a stamped copper busbar.

4. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 1, characterized in that: The nine neutral welding ends are evenly distributed in a ring shape.

5. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 1, characterized in that: The nine first welding ends are evenly distributed in a ring shape.

6. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 1, characterized in that: The first welding end is located above the neutral lead wire.

7. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 1, characterized in that: The three second welding ends of each group of the connecting wires are centrally arranged, and the three connecting wires of each group extend in a common circle, and the three first welding ends are evenly distributed in a ring shape.

8. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 7, characterized in that: Two of the connected wires in the same group are located at the same level and are reversely coiled in a ring shape from the second welding end to the first welding end; The remaining connecting wire is located above one of the other two connecting wires, and an angle between the first welding end and the corresponding second welding end is no greater than 40°.

9. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 8, characterized in that: The three groups of connected wires are concentrically coiled and arranged in sequence along the diameter direction, wherein the second welding end of the group of connected wires located at the outermost or innermost circumference is located between the second welding ends of the remaining two groups of connected wires along the circumferential direction; The three groups of the second welding ends are integrated and located between three adjacent first welding ends.

10. A busbar for three-phase three-branch windings with evenly distributed lead wires as claimed in claim 9, characterized in that: The insulating layer is arranged along a circumferential closed loop, the connecting structure and the insulating layer are integrally injection-molded, and the connecting structure comprises: A first connector, used to connect the first welding end and the connected wire at the first welding end to the insulating layer; A second connecting member, used to connect together three groups of the second welding ends, the connected wires at the second welding ends, the first connecting member adjacent to the second welding ends, and the insulating layer; The arc-shaped connecting piece is used to connect the two first connecting pieces located at both ends of the neutral lead-out line.

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