A stator for a rotary electric machine

Abstract

A kind of stator for rotary electric machine, including core, be equipped with parallel slot on core;Flat wire winding, flat wire winding is arranged in parallel slot;Busbar, busbar is connected with flat wire winding;Wherein flat copper wire winding includes three-phase U-phase winding, V-phase winding and W-phase winding with 120 ° electric angle.It is used to the stator for rotary electric machine can make the current balance in each branch of stator three-phase winding, reduce temperature rise, improve motor efficiency.Simplify the problem of profiled wire forming, through the arrangement of layered high-low different welding spots, reduce the occupation of radial space.And using flexible wire solves the positioning difficulty problem of power supply lead wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical field, in particular to an electric machine, and more particularly to a stator for a rotating electric machine. BACKGROUND

[0002] Currently, in order to realize the high efficiency, miniaturization and integration of the electric machine, the electric machine with flat copper wire winding stator is adopted. The flat copper wire has better slot utilization and heat dissipation. Generally, the electric machine for vehicle has a high speed range. With the increase of the speed, the flat copper wire will generate higher eddy current loss in the high frequency magnetic field because the size is much larger than the round enameled wire. Therefore, the flat copper wire winding usually adopts a multi-layer structure in the core to reduce the eddy current loss generated by the alternating current in the copper core. However, due to the difference of the magnetic field interlinked at different positions in the slot, the copper wires in different layers have different alternating current loss and alternating current resistance, which easily leads to the problem of unbalanced current. SUMMARY

[0003] In view of the above technical defects, the present application aims to provide a stator for a rotating electric machine which solves the above technical problems.

[0004] To solve the above technical problems, the stator for a rotating electric machine of the present application comprises:

[0005] a core, wherein S parallel slots are arranged on the core in the circumferential direction, and S is an integer;

[0006] a flat wire winding, wherein the flat wire winding is arranged in the parallel slots, the flat wire winding is formed by winding flat copper enameled wire, and any one of the parallel slots contains M layers of flat copper enameled wire, and M is an even number;

[0007] a busbar, wherein the busbar is connected with the flat wire winding; and

[0008] the flat copper wire winding comprises a U-phase winding, a V-phase winding and a W-phase winding, and the U-phase winding and the V-phase winding, the V-phase winding and the W-phase winding, and the W-phase winding and the U-phase winding are different by 120° electric angle.

[0009] the tail ends of the U-phase winding, the V-phase winding and the W-phase winding are connected in a star type, and the head ends and the tail ends of the U-phase winding, the V-phase winding and the W-phase winding are connected with the busbar.

[0010] the U-phase winding, the V-phase winding and the W-phase winding each comprise two branches connected in parallel, and each branch comprises a plurality of U-shaped flat copper wires connected with each other.

[0011] each branch comprises U-shaped flat copper wires with a span of J-1, J and J+1, J=S / M, J is an integer greater than 1; and

[0012] The U-shaped flat copper wire with a span of J-1 is located below the U-shaped flat copper wire with a span of J+1 in the axial direction of the core, and the U-shaped flat copper wire with a span of J-1 has a gap between the top end and the bottom end of the U-shaped flat copper wire with a span of J+1, and the U-shaped flat copper wires with a span of J are arranged in parallel in the radial direction and have the same height in the axial direction.

[0013] The U-shaped flat copper wire includes two straight ends, and the two straight ends are located in adjacent two layers in the parallel grooves.

[0014] The busbar row includes a star point copper row, two U-phase copper rows, a V-phase copper row, two W-phase copper rows, a plastic coating layer, U-phase soft outgoing wires, V-phase soft outgoing wires and W-phase soft outgoing wires.

[0015] The star point copper row, the two U-phase copper rows, the V-phase copper row and the two W-phase copper rows are combined into a busbar row body by injection molding; wherein

[0016] The injection molding parts of the U-phase copper rows are located in two different layers of the busbar row, the injection molding part of the V-phase copper row is located in two different layers of the busbar row, the injection molding parts of the two W-phase copper rows are located in the same layer of the busbar row, the U, V and W three-phase soft outgoing wires are welded into one body with the busbar row body, the welding points of the busbar row are distributed along the axial direction, and the heights are different.

[0017] The stator for a rotating electric machine can balance the currents in each branch of the three-phase winding of the stator, reduce the temperature rise and improve the efficiency of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application.

[0019] Figure 2 is a schematic diagram of the flat copper wire winding structure in the present application Figure 1 .

[0020] Figure 3 is a schematic diagram of the flat copper wire winding structure in the present application Figure 2 .

[0021] Figure 4 is a schematic diagram of the flat copper wire winding structure in the present application Figure 3 .

[0022] Figure 5 is a schematic diagram of the busbar row structure in the present application. DETAILED DESCRIPTION

[0023] The stator for a rotating electric machine of the present application will be further described in detail below with reference to the accompanying drawings.

[0024] As Figures 1-5The stator of the rotary electric machine comprises a stator core 1, a flat copper wire winding 2 and a busbar 6 with soft copper outgoing wires. The stator core has 48 parallel slots, and each slot has 4 layers of flat copper wires.

[0025] The flat copper wire winding is composed of three phases of winding U, V and W with an electric angle of 120°. The tail ends of the three-phase winding are connected in a star type. Each phase of winding corresponds to 8 magnetic poles.

[0026] Each phase of winding comprises two branches. Taking the U phase as an example, each branch is composed of a hairpin flat copper wire 10 with a span of 5, a hairpin flat copper wire 11 with a span of 6 and a hairpin flat copper wire 12 with a span of 7. The U-shaped wires with spans of 5 and 7 have different heights in the axial direction of the core. The U-shaped wire with a span of 5 is below the U-shaped wire with a span of 7. The top end of the U-shaped wire with a span of 5 and the bottom end of the U-shaped wire with a span of 7 have a certain gap. The U-shaped wire with a span of 6 is arranged side by side in the radial direction and has the same height in the axial direction.

[0027] Each hairpin flat copper wire has two straight ends. One end is in the first layer of the slot, and the other end is in the second layer of the slot. Alternatively, one end is in the third layer of the slot, and the other end is in the fourth layer of the slot.

[0028] The straight parts of all hairpin flat copper wires in any one branch are uniformly distributed in the first, second, third and fourth layers of the core slot.

[0029] The distribution relationship of the straight parts in the U phase slot is distinguished by different shapes to distinguish the two branches of the U phase. Any one branch is uniformly distributed in the first to fourth layers.

[0030] The busbar is composed of a star point copper bar 15, a U phase copper bar 16, a V phase copper bar 17, a W phase copper bar 18, a plastic coating layer 9, a U phase soft outgoing wire 3, a V phase soft outgoing wire 4 and a W phase soft outgoing wire 5. The star point copper bar, the two U phase copper bars, the V phase copper bar and the two W phase copper bars are combined by injection molding to form a busbar body. The injection molding parts of the two U phase copper bars are located in the upper layer 19 and the middle layer 20 of the busbar. The injection molding part of the V phase copper bar is located in the upper layer and the middle layer of the busbar. The injection molding parts of the two W phase copper bars are located in the same layer of the busbar. The star point copper bar is located in the lower layer 21. The UVW three-phase soft outgoing wires are welded with the busbar body to form an integral whole. The welding points of the busbar have different heights in the axial direction.

[0031] The preferred embodiments of the present application have been specifically described above, but the present application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope of the present application.

Claims

1. A stator for a rotary electric machine, characterized by, The utility model relates to a kind of core, S parallel grooves are arranged on the core in circumferential direction, S is integer; Flat wire winding, flat wire winding is arranged in parallel groove, flat wire winding is formed by flat copper enameled wire winding, any one parallel groove includes M layers of flat copper enameled wire, M is even number; Busbar, busbar is connected with flat wire winding; Wherein Flat wire winding includes U-phase winding, V-phase winding and W-phase winding, U-phase winding and V-phase winding, V-phase winding and W-phase winding, W-phase winding and U-phase winding are all different by 120 ° electric angle; Tail end of U-phase winding, V-phase winding and W-phase winding is connected in star type, head end and tail end of U-phase winding, V-phase winding and W-phase winding are connected with busbar; U-phase winding, V-phase winding and W-phase winding each include two parallel branches, and each branch includes multiple U-shaped flat copper wires connected with each other; Each branch includes U-shaped flat copper wire with span J-1, J, J+1, J=S / M, J is integer greater than 1;Wherein, U-shaped flat copper wire with span J-1 is located below U-shaped flat copper wire with span J+1 in axial direction of core, U-shaped flat copper wire with span J-1 has gap between top end and bottom end of U-shaped flat copper wire with span J+1, U-shaped flat copper wire with span J is arranged in parallel in radial direction, and height is same in axial direction. U-shaped flat copper wire includes two straight ends, and two straight ends are located in adjacent two layers in parallel groove.

2. The stator for a rotary electric machine according to claim 1, characterized by Busbar includes star point copper bar, two U-phase copper bars, V-phase copper bar, two W-phase copper bars, plastic layer, U-phase soft outgoing line, V-phase soft outgoing line and W-phase soft outgoing line.

3. The stator for a rotary electric machine according to claim 2, characterized by Star point copper bar, two U-phase copper bars, V-phase copper bar, two W-phase copper bars are combined into busbar body by injection molding; 4. The stator for a rotary electric machine according to claim 3, characterized by Wherein Injection molding part of U-phase copper bar is located in two layers of busbar respectively, injection molding part of V-phase copper bar is located in two layers of busbar, injection molding part of two W-phase copper bars is located in same layer of busbar, U, V, W three-phase soft outgoing line is welded into a whole with busbar body, and welding point of busbar is distributed along axial height. ​

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