Three-phase symmetrical short-distance stator assembly and three-phase symmetrical short-distance motor

Abstract

The stator assembly comprises a stator iron core and stator windings, 72 stator grooves are arranged on the stator iron core, the stator windings are arranged in the stator grooves, the number of layers of the stator windings is 2M, M = {1, 2, 3,...}, the stator windings are three-phase stator windings, the hairpin end span is four stator grooves or six stator grooves, and the stator winding is a three-phase stator winding. The span of the welding end is seven stator slots; one phase of the stator winding comprises a plurality of symmetrical branches which are connected in series or in parallel or in series and in parallel. Compared with the prior art, the utility model has the advantages that the hairpin end span is short, the resistance is small, fifth and seventh harmonics are weakened, the efficiency of the motor is improved, the NVH (Noise Vibration and Harshness) performance of the motor is optimized, and the space and materials are saved; the spans of the card issuing end are arranged in a large-small staggered manner, so that circulating current between branches is eliminated; through the welding end copper bar, the arrangement structure of different branches can be realized without changing the span arrangement of the hairpin end and the welding end, and the processing is convenient.

Description

Technical Field

[0001] The utility model relates to the design of a motor stator component, in particular to a three-phase symmetrical short-pitch stator component and a three-phase symmetrical short-pitch motor. Background Art

[0002] Flat wire motors are motors that use flat wires (called flat wires) instead of traditional round wires as windings. The advantages of flat wire motors are that they are more compact, more material-efficient, and have higher power density. In the electric drive system of new energy vehicles, flat wire motors can provide better acceleration performance and less noise, greatly improving the performance of the entire vehicle.

[0003] After searching, the application publication number CN116667576A discloses a ten-layer Hairpin type flat copper wire winding motor stator assembly, which specifically discloses: the flat copper wire winding motor stator assembly includes a stator core, a stator winding, insulating paper, a special-shaped copper bar and a three-phase connected busbar; the key point is that each stator of the stator winding is formed by a three-phase winding of U phase, V phase and W phase in a "Y-type" connection to form a loop, each phase is connected by 4 branch windings in parallel, and the span interval of each branch winding is alternating long and short distances: 8-5-6-5, 6-5-8-5; the number of winding connection layers corresponding to each branch is from the outermost layer to the innermost layer, and the three-phase lead-out tail ends are connected with a neutral point, corresponding to two neutral points, the inner layer is connected to the inner layer neutral point N1, and the outer layer is connected to the outer layer neutral point N2.

[0004] However, the prior art hairpin end has a large span, which results in a large length and resistance of the copper wire at the end, resulting in a problem of reduced efficiency. Therefore, how to design a stator assembly with high efficiency and good NVH performance is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a three-phase symmetrical short-pitch stator assembly and a three-phase symmetrical short-pitch motor in order to overcome the defects of the prior art such as large resistance and low efficiency.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the utility model, a three-phase symmetrical short-pitch stator assembly is provided, which is matched with a 12-pole rotor, and is characterized in that the stator assembly includes a stator core and a stator winding, the stator core is provided with 72 stator slots, the stator winding is arranged in the stator slots, and the number of layers is 2M, where M={1,2,3,...}, the stator winding is a three-phase stator winding, including a hairpin end and a welding end, the hairpin end has a span of 4 stator slots or 6 stator slots, and the welding end has a span of 7 stator slots; one phase of the stator winding includes multiple symmetrical branches, and the branches are connected in series or in parallel or in series and in parallel.

[0008] As a preferred technical solution, the spans of the 4 stator slots and 6 stator slots at the hairpin end are arranged in sequence, and the spans of the hairpin end and the welding end of the stator winding are 4-7 and 6-7, which are continuously circulated until the stator winding is arranged in the stator slots.

[0009] As a preferred technical solution, the number of stator slot layers is 10, and one phase of the stator winding includes 4 branches.

[0010] As a preferred technical solution, the stator assembly also includes a welding end copper bar, which includes a parallel copper bar and a series copper bar. When one phase of the stator winding contains multiple branches, the multiple branches of one phase of the stator winding are connected in parallel or in series through the parallel copper bar and the series copper bar.

[0011] As a preferred technical solution, one phase of the stator winding includes four branches, and the four branches are connected in parallel through the parallel copper bar to form a four-branch arrangement structure of the stator winding.

[0012] As a preferred technical solution, one phase of the stator winding includes four branches, two branches are connected in series through the series copper bar to obtain two branches; two branches are connected in parallel through the parallel copper bar to form a two-branch arrangement structure of the stator winding.

[0013] As a preferred technical solution, one phase of the stator winding includes four branches, and the four branches are connected in series through the series copper bar to obtain one main branch, forming a branch arrangement structure of the stator winding.

[0014] As a preferred technical solution, the coil in the stator winding is a U-shaped coil, which is a coil with a span of 4 stator slots or a coil with a span of 6 stator slots.

[0015] As a preferred technical solution, the three-phase stator winding is arranged by rotating one phase by 120 electrical degrees in two directions, and the three-phase winding is connected in star or triangle.

[0016] According to another aspect of the utility model, a three-phase symmetrical short-pitch motor is provided, including a three-phase symmetrical short-pitch stator assembly.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1) The hairpin end of the utility model has a short span and low resistance, which weakens the 5th and 7th harmonics, is conducive to improving the efficiency of the motor and optimizing the NVH performance of the motor; the short span reduces the overall height of the hairpin end, saving space and materials;

[0019] 2) The span of the hairpin end of the utility model is staggered with large and small spans, and the branches are symmetrical, which eliminates the circulation between the branches and reduces the AC effect caused by the flat wire coil;

[0020] 3) The utility model can conveniently connect branches through parallel copper bars and series copper bars at the welding end, and can realize the arrangement structure of different branches without changing the span arrangement of the hairpin end and the welding end, which is convenient for processing and reduces production costs;

[0021] 4) The U-shaped coil of the utility model only includes coils of two types of spans, which is convenient for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-phase winding arrangement diagram of an embodiment of the utility model;

[0023] Figure 2 This is the U-phase winding arrangement diagram of the embodiment of the utility model;

[0024] Figure 3 This is a partial diagram of the U-phase winding arrangement of an embodiment of the utility model;

[0025] Figure 4 This is a branch connection diagram of Example 1 of the utility model;

[0026] Figure 5 This is a schematic diagram of the welding end and copper bar structure of the stator assembly of Example 1 of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the card issuing end of the stator assembly of Embodiment 1 of the utility model;

[0028] Figure 7 This is a branch connection diagram of Embodiment 2 of the present utility model;

[0029] Figure 8 This is a schematic diagram of the welding end and copper bar structure of the stator assembly of Example 2 of the utility model;

[0030] Fig. 9 This is a branch connection diagram of Embodiment 3 of the present utility model;

[0031] Fig.10 This is a schematic diagram of the welding end and copper bar structure of the stator assembly of Example 3 of the utility model;

[0032] Fig.11 This is a schematic diagram of the U-shaped coil structure of the utility model. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0034] The utility model provides a three-phase symmetrical short-pitch stator assembly and a three-phase symmetrical short-pitch motor. The stator assembly cooperates with a rotor with a pole number of 2p=12, and includes a stator core, a stator winding and a welding end copper bar. The stator core is provided with 72 stator slots, and the stator winding is arranged in the stator slots, with a layer number of 2M, M={1,2,3,…}. The stator winding is a three-phase stator winding, including a hairpin end and a welding end. The hairpin end spans 4 stator slots or 6 stator slots, and the welding end spans 7 stator slots. One phase of the stator winding includes 1 branch, 2 branches or 4 branches. Based on the basic wiring method of 72 slots, 2M layers and 4 branches, the end copper bars are connected in series and parallel to achieve a design result in which the number of lines remains unchanged and there is no branch circulation. At the same time, the winding of this connection method is short-distance, which can greatly weaken the 5th and 7th harmonics. The motor includes the above-mentioned stator assembly.

[0035] Example 1

[0036] The utility model provides a three-phase symmetrical short-pitch stator assembly, 72 slots and 12 poles, such as Figure 1 to Figure 3 As shown in Table 1, 2M = 10. When M takes other values, the winding connection method can be determined by simple analogy, reducing or increasing the number of layers of stator winding flat wires. According to this wiring method, a three-phase rotating magnetic field can be formed after the current is passed. The U-shaped wires of this wiring form are divided into two types with a span of 4 and a span of 6. Each U-shaped wire spans two layers, so the specific size is determined by the distance between the two layers. When the distances between adjacent layers are different, there are 2M types of U-shaped wires. This wiring form has 4 branches, namely U1, U2, U3 and U4.

[0037] Table 1U phase 4 branch wiring table

[0038]

[0039] In the first branch U1, the slot bottom is recorded as the first layer of the 10-layer stator winding flat wire, and the slot mouth is recorded as the 10th layer of the 10-layer stator winding flat wire. The connection form is:

[0040] 19 slots 10 layers - 15 slots 9 layers - 8 slots 10 layers - 2 slots 9 layers - 67 slots 10 layers - 63 slots 9 layers - 56 slots 10 layers - 50 slots 9 layers - 43 slots 10 layers - 39 slots 9 layers - 32 slots 10 layers - 26 slots 9 layers - 19 slots 8 layers - 15 slots 7 layers - 8 slots 8 layers - 2 slots 7 layers - 67 slots 8 layers - 63 slots 7 layers - 56 slots 8 layers - 50 slots 7 layers - 43 slots 8 layers - 39 slots 7 layers - 32 slots 8 layers - 26 slots 7 layers - 19 slots 6 layers - 15 slots 5 layers - 8 slots 6 layers - 2 slots 5 layers - 67 slots 6 layers - 63 slots 5 Layer-56 slot 6 layers-50 slot 5 layers-43 slot 6 layers-39 slot 5 layers-32 slot 6 layers-26 slot 5 layers-19 slot 4 layers-15 slot 3 layers-8 slot 4 layers-2 slot 3 layers-67 slot 4 layers-63 slot 3 layers-56 slot 4 layers-50 slot 3 layers-43 slot 4 layers-39 slot 3 layers-32 slot 4 layers-26 slot 3 layers-19 slot 2 layers-15 slot 1 layer-8 slot 2 layers-2 slot 1 layer-67 slot 2 layers-63 slot 1 layer-56 slot 2 layers-50 slot 1 layer-43 slot 2 layers-39 slot 1 layer-32 slot 2 layers-26 slot 1 layer.

[0041] The wiring methods of other branches can be obtained from Table 1. Figures 4 to 6 As shown, the parallel copper bars of the welding end copper bars connect the four branches in parallel to form a four-branch arrangement structure of the stator winding.

[0042] According to the U-phase 4 branches, the V-phase and W-phase can be arranged in star connection or triangle connection with a difference of 120° electrical angle, and the three-phase winding is Y-type (i.e. star) connection.

[0043] This embodiment realizes the parallel connection of 4 branches of 72-slot 12-pole 2M layers (M=1, 2, 3, 4, 5, ...) flat wire motor, and the three-phase current can form a rotating magnetic field, with a total of 2M types of lines. A flat wire winding arrangement method with terminal characterization as 72-slot 12-pole motor 4 branches is provided. Based on this flat wire winding arrangement method, a three-phase symmetrical winding arrangement can be achieved, and the circulating current between branches can be eliminated. Under the consideration of cost and performance based on mass production, the adverse effects caused by the use of flat wire technology can be minimized. At the same time, the winding of this connection method is short-distance, which can greatly weaken the 5th and 7th harmonic electromotive force.

[0044] Example 2

[0045] The utility model provides a three-phase symmetrical short-pitch stator assembly, 72 slots and 12 poles, such as Figure 1 to Figure 3As shown, 2M = 10. When M takes other values, the winding connection method can be determined by simple analogy, reducing or increasing the number of layers of stator winding flat wires. According to this wiring method, a three-phase rotating magnetic field can be formed after the current is passed. The U-shaped wires of this wiring form are divided into two types with a span of 4 and a span of 6. Each U-shaped wire spans two layers, so the specific size is determined by the distance between the two layers. When the distances between adjacent layers are different, there are 2M types of U-shaped wires. This wiring form has 2 branches, namely U1′ and U2′. U1′ is U1 and U4 in series; U2′ is U2 and U3 in series.

[0046] like Figure 6 and Figure 7 As shown, the series copper bar of the welding end copper bar connects four branches in series in pairs to obtain two branch circuits, and the parallel copper bar connects the two branch circuits in parallel to form a two-branch arrangement structure of the stator winding.

[0047] According to the two branches of the U phase, the V phase and the W phase can be arranged with a phase difference of 120° electrical angle, and the three-phase winding is connected in Y type (i.e. star type).

[0048] This embodiment is based on the 4 branches of embodiment 1. Through the design invention of connecting the copper bar at the end, the 2-branch terminal performance of the 72-slot 12-pole motor 2M layers (M=1, 2, 3, 4, 5, ...) flat wire is realized. The three-phase current can form a rotating magnetic field, realize the three-phase symmetrical winding arrangement, eliminate the circulating current between the branches, and the winding of this connection mode is short-distance, which can greatly weaken the 5th and 7th harmonic electromotive force. At the same time, the line type is not increased, which is conducive to reducing the adverse effects of using flat wire technology and improving production flexibility.

[0049] Example 3

[0050] The utility model provides a three-phase symmetrical short-pitch stator assembly, 72 slots, 12 poles and 3 phases, such as Figure 1 to Figure 3 As shown, 2M = 10. When M takes other values, the winding connection method can be determined by simple analogy, reducing or increasing the number of layers of stator winding flat wires. According to this wiring method, a three-phase rotating magnetic field can be formed after the current is passed. The U-shaped wires of this wiring form are divided into two types with a span of 4 and a span of 6. Each U-shaped wire spans two layers, so the specific size is determined by the distance between the two layers. When the distances between adjacent layers are different, there are 2M types of U-shaped wires. This wiring form has 1 branch, which is U, and U is U1, U2, U3 and U4 connected in series.

[0051] like Fig. 9 and Fig.10 As shown, the series copper bars of the welding end copper bars connect four branches in series to obtain one main branch, forming a one-branch arrangement structure of the stator winding.

[0052] According to the U phase 1 branch, the V phase and W phase can be arranged with a phase difference of 120° electrical angle, and the three-phase winding is connected in Y type (i.e. star type).

[0053] This embodiment is based on the 4 branches of embodiment 1. Through the design invention of connecting the copper bar at the end, the 1 branch terminal performance of the 72-slot 12-pole motor 2M layers (M=1, 2, 3, 4, 5, ...) flat wire is realized. The Y-type connection can form a rotating magnetic field by passing three-phase current, realize the three-phase symmetrical winding arrangement, eliminate the circulating current between the branches, and the winding of this connection mode is short-distance, which can greatly weaken the 5th and 7th harmonic electromotive force. At the same time, the line type is not increased, which is conducive to reducing the adverse effects of using flat wire technology and improving production flexibility.

[0054] Example 4

[0055] The utility model provides a three-phase symmetrical short-pitch motor, wherein any three-phase symmetrical short-pitch stator assembly of Embodiments 1 to 3 is adopted.

[0056] like Fig.11 As shown, the U-shaped coil of the utility model includes two types of coils with spans, which are divided into two types with a span of 4 and a span of 6. Each U-shaped wire spans two layers, so the specific size is determined by the distance between the two layers. When the distances between two adjacent layers are different, there are 2M types of U-shaped wires, which are few in number and easy to produce.

[0057] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A three-phase symmetrical short-pitch stator assembly, matched with a 12-pole rotor, characterized in that: The stator assembly includes a stator core and a stator winding. The stator core is provided with 72 stator slots. The stator winding is arranged in the stator slots, and the number of layers is 2M, where M={1,2,3,...}. The stator winding is a three-phase stator winding, including a hairpin end and a welding end. The hairpin end has a span of 4 stator slots or 6 stator slots, and the welding end has a span of 7 stator slots. One phase of the stator winding includes multiple symmetrical branches, and the branches are connected in series or in parallel or in series and in parallel.

2. A three-phase symmetrical short-pitch stator assembly according to claim 1, characterized in that: The spans of the 4 stator slots and the 6 stator slots at the hairpin end are arranged in sequence, and the spans of the hairpin end and the welding end of the stator winding are 4-7 and 6-7, which are continuously circulated until the stator winding is arranged in the stator slot.

3. A three-phase symmetrical short-pitch stator assembly according to claim 2, characterized in that: The number of stator slot layers is 10, and one phase of the stator winding includes 4 branches.

4. A three-phase symmetrical short-pitch stator assembly according to claim 1, characterized in that: The stator assembly also includes a welding end copper bar, which includes a parallel copper bar and a series copper bar, and multiple symmetrical branches of one phase of the stator winding are connected in parallel or in series through the parallel copper bar and the series copper bar.

5. A three-phase symmetrical short-pitch stator assembly according to claim 4, characterized in that: One phase of the stator winding includes four branches, and the four branches are connected in parallel through the parallel copper bar to form a four-branch arrangement structure of the stator winding.

6. A three-phase symmetrical short-pitch stator assembly according to claim 4, characterized in that: One phase of the stator winding includes four branches, and two branches are connected in series through the series copper bar to obtain two branch roads; two branches are connected in parallel through the parallel copper bar to form a two-branch arrangement structure of the stator winding.

7. A three-phase symmetrical short-pitch stator assembly according to claim 4, characterized in that: One phase of the stator winding includes four branches, and the four branches are connected in series through the series copper bar to obtain one main branch, forming a branch arrangement structure of the stator winding.

8. The three-phase symmetrical short-pitch stator assembly according to claim 1, characterized in that: The coil in the stator winding is a U-shaped coil, which is a coil with a span of 4 stator slots or a coil with a span of 6 stator slots.

9. The three-phase symmetrical short-pitch stator assembly according to claim 1, characterized in that: The three-phase stator winding is arranged by rotating one phase in two directions by 120 electrical degrees, and the three-phase winding is connected in star or triangle.

10. A three-phase symmetrical short-pitch motor, characterized in that: It comprises the three-phase symmetrical short-pitch stator assembly as described in any one of claims 1 to 9.

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