CN212258560U - Three-phase stator winding, motor stator assembly and motor - Google Patents

Abstract

The utility model belongs to the field of motors, and discloses a three-phase stator winding, a motor stator assembly and a motor, wherein the three-phase stator winding comprises N layers of hairpin windings superimposed in sequence, N≥4 and an even number; The winding includes M parallel branches, where M is an integer multiple of 4; in each phase of the stator winding, there is no circulating current between the parallel branches; the welding end of the hairpin coil and the outlet end of the winding are on the same side. The counter electromotive force induced in all the parallel branches of the utility model is equal, so that there is no potential difference between the branches, and no circulating current is generated between the branches.

Description

Three-phase stator winding, motor stator assembly and motor

technical field

The utility model belongs to the field of motors, in particular to a three-phase stator winding, a motor stator assembly and a motor.

Background technique

With the development of new energy vehicles, the requirements for permanent magnet synchronous motors for vehicles are getting higher and higher. At present, motor stator windings with 4-layer, 6-layer and 8-layer hairpin coils have appeared. Most of the stator windings have one or two branches in parallel for each phase, which is difficult to meet the power requirements of permanent magnet synchronous motors for automobiles. The number of branches in each phase of the winding becomes an inevitable choice for improving power.

However, there is a circulating current between the multiple branches connected in parallel in each phase, especially for the stator winding with multi-layer hairpin coils, the circulating current phenomenon is more significant. The existence of circulating current will increase the additional copper loss and drag loss of the motor, reduce the efficiency of the motor, and seriously affect the rated parameters of the motor.

Utility model content

The purpose of the utility model is to provide a three-phase stator winding, each phase winding is realized by four branches in parallel, so that the position of each slot in each branch relative to the rotor magnetic steel is the same, and all the branches are in the same position. The hairpin coils located in the same slot relative to the magnetic steel are on the same layer, which can completely eliminate the circulation between the branches.

In order to achieve the above purpose, in the first aspect, the present utility model provides a three-phase stator winding, which includes N layers of hairpin windings superimposed in sequence, N≥4 and an even number; each phase stator winding includes M parallel branches, where M is Integer multiple of 4; in each phase stator winding, in each pair of parallel branches, the number of stator slots occupied by each hairpin coil in one branch is the same as the number of stator slots occupied by each hairpin coil in the other branch, and The position of each stator slot where each hairpin coil is located in one branch relative to each magnetic steel on the rotor is the same as the position of each stator slot where each hairpin coil in the other branch is located relative to each magnet steel on the rotor. The hairpin coil in each stator slot is on the same layer as the hairpin coil in each stator slot in the other branch; the welding end of the hairpin coil and the outlet end of the winding are on the same side.

Further, the number of stator slots is 48, the number of motor poles is 8, N=8, M=4.

Further, the card issuing coils in each branch occupy all the layers from the first to the eighth.

Further, the hairpin coils in each branch only occupy once per layer under a pair of poles.

Further, the card issuing coils in each branch are all different-layer spanning wires.

Further, the different layer spanning lines are spanning lines between adjacent layers, and the adjacent layers are any of the four types of 1-2 layers, 3-4 layers, 5-6 layers and 7-8 layers kind.

Further, each branch of the stator winding of each phase includes 16 complete hairpin coils, and the span of each hairpin coil has two types: full-pitch and short-pitch, and these two spans appear alternately.

Further, the short distance is 4.

In a second aspect, the present invention provides a motor stator assembly, which includes the three-phase stator winding described in the technical solution of the first aspect.

In a third aspect, the present invention provides a motor including the motor stator assembly described in the technical solution of the second aspect.

All the parallel branches of the present invention have the following three characteristics at the same time: firstly, the number of stator slots occupied by each hairpin coil is the same; In the third aspect, the hairpin coils in each stator slot are on the same layer. According to the calculation formula of the induced electromotive force E=BLv sinθ and the waveform function of the AC voltage E=E _m sin(wt+φ), the branch with the above three characteristics, B, L, v, θ, E _m and φ are all If they are equal, the induced back EMFs are equal, so that there is no potential difference between the branches, and there will be no circulating current between the branches.

Other features and advantages of the present invention will be described in detail in the detailed description section that follows.

Description of drawings

1 is a schematic diagram of the arrangement structure of an embodiment of the three-phase stator winding of the present invention;

2 is a schematic diagram of the arrangement structure of four parallel branches of B-phase under two pairs of poles in an embodiment of the three-phase stator winding of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

First of all, it should be noted that, in the description of the following technical solutions of the present utility model, the azimuth or positional relationship indicated by the azimuth word is based on the azimuth or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the It is described, rather than indicated or implied, that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

As shown in Figure 1, an embodiment of the three-phase stator winding of the present utility model is used for a three-phase permanent magnet synchronous motor with 48 stator slots and 8 motor poles, that is, it has 4 pairs of rotor magnetic poles or rotor magnetic steel, The rotor magnetic steel is the rotor magnetic poles N and S shown in FIG. 2 . At this time, the pole pitch of the motor is 6. If the pitch or span of the hairpin coil is equal to 6, it is a full pitch, if it is greater than 6, it is a long pitch, and if it is less than 6, it is a short pitch. The hairpin winding has 8 layers, that is, N=8. In Figure 1, the middle row of numbers represents the number of the stator slots, there are 48 stator slots in total, and the eight lines from left to right in each slot correspond to the first, second, third, fourth, fifth, sixth, seventh and eighth layers respectively. , the first layer is the layer closest to the rotor magnet of the motor, that is, the innermost layer relative to the axis of the motor.

As shown in Figure 1, the stator winding of each phase includes 4 parallel branches. In each phase of the stator winding, in each pair of parallel branches, the number of stator slots occupied by the hairpin coils in one branch is the same as that of the other branch. The number of stator slots occupied by each hairpin coil is the same, and the position of each stator slot where each hairpin coil in one branch is located relative to each magnet on the rotor is the same as the position of each stator slot where each hairpin coil in the other branch is located relative to the rotor. The positions of the upper magnets are the same, and the hairpin coils in each stator slot in one branch are on the same layer as the hairpin coils in each stator slot in the other branch; the welding end of the hairpin coil and the outlet end of the winding are on the same side.

In this embodiment, taking phase B as an example, there are 4 parallel branches B1-B4, each two parallel branches form a pair, then there are C(4, 2)=6 pairs of parallel branches, B1 and B2 respectively , B1 and B3, B1 and B4, B2 and B3, B2 and B4, B3 and B4, there is no circulating current between each pair of parallel branches.

Taking branch B1 and branch B3 as examples, as shown in Figure 2, under the two pairs of poles, each hairpin coil in branch B1 occupies 2 slots 1 layer, 2 slots 3 layers, 2 slots 5 layers, and 2 slots respectively. 7 layers, 8 slots 2 layers, 8 slots 4 layers, 8 slots 6 layers, 8 slots 8 layers, 15 slots 1 layer, 15 slots 3 layers, 15 slots 5 layers, 15 slots 7 layers, 19 slots 2 layers, 19 slots 4 layers, 19 slots, 6 layers, and 19 slots, 8 layers, occupying 4 stator slots. Correspondingly, each hairpin coil in branch B3 occupies 2 slots, 2 layers, 2 slots, 4 layers, 2 slots, 6 layers, and 2 slots. 8 layers, 9 slots 1 layer, 9 slots 3 layers, 9 slots 5 layers, 9 slots 7 layers, 13 slots 2 layers, 13 slots 4 layers, 13 slots 6 layers, 13 slots 8 layers, 20 slots 1 layer, 20 slots 3 layers, 5 layers of 20 slots, and 7 layers of 20 slots also occupy 4 stator slots. Among them, the position of the 2 slots occupied by the hairpin coil in the branch B1 relative to the rotor magnet N is the same as the position of the 20 slots occupied by the hairpin coil in the branch B3 relative to the rotor magnet S. The position of the hairpin coil in the 2 slots in the branch B1 They are located on the 1st floor, 3rd floor, 5th floor and 7th floor, respectively. The 20-slot hairpin coils in branch B3 are also located on 1st, 3rd, 5th and 7th floors respectively, that is, on the same floor; The position of the slot relative to the rotor magnet S is the same as the position of the 2 slots occupied by the hairpin coils in the branch B3 relative to the rotor magnet N, and the hairpin coils of the 8 slots in the branch B1 are located on the 2nd, 4th, 6th and 2nd floors respectively. 8 layers, the hairpin coils of 2 slots in branch B3 are also located on the 2nd, 4th, 6th and 8th layers, that is, on the same floor; the 15 slots occupied by the hairpin coils in branch B1 are relative to the position of the rotor magnet N The position of the 9 slots occupied by the hairpin coils in branch B3 is the same relative to the rotor magnet S, the hairpin coils of 15 slots in branch B1 are located on the 1st, 3rd, 5th and 7th floors respectively, and the 9th slot in branch B3 The hairpin coils are also located on the 1st, 3rd, 5th and 7th floors respectively, that is, on the same floor; the position of the 19 slots occupied by the hairpin coils in branch B1 relative to the rotor magnet S is the same as the position of the 13 slots occupied by the hairpin coils in branch B3 The position relative to the rotor magnet N is the same. The hairpin coils of the 19-slots in the branch B1 are located on the 2nd, 4th, 6th and 8th floors respectively, and the hairpin coils of the 13-slots in the branch B3 are also located on the 2nd and 4th floors respectively. , 6 layers and 8 layers, that is, on the same layer. It can be seen that the branch B1 and the branch B3 have the following three characteristics at the same time: 1. The number of stator slots occupied by each hairpin coil is the same, 2. The position of the stator slot where each hairpin coil is located relative to each magnet on the rotor is the same, 3. The hairpin coils in each stator slot are on the same layer. Therefore, the back EMF induced by the branch B1 is equal to the back EMF induced by the branch B3, so that there is no potential difference between the branch B1 and the branch B3, and there will be no circulating current between the branch B1 and the branch B3.

Taking branch B2 and branch B4 as examples, as shown in Figure 2, under two pairs of poles, each hairpin coil in branch B2 occupies 3 slots, 1 layer, 3 slots, 3 layers, 3 slots, 5 layers, and 3 slots respectively. Slot 7 layers, 7 slots 2 layers, 7 slots 4 layers, 7 slots 6 layers, 7 slots 8 layers, 14 slots 1 layer, 14 slots 3 layers, 14 slots 5 layers, 14 slots 7 layers, 20 slots 2 layers, 20 slots The slots have 4 layers, 20 slots, 6 layers, and 20 slots and 8 layers, occupying 4 stator slots. Correspondingly, each hairpin coil in branch B4 occupies 1 slot 2 layers, 1 slot 4 layers, 1 slot 6 layers, and 1 slot respectively. Slot 8 layers, 8 slots 1 layer, 8 slots 3 layers, 8 slots 5 layers, 8 slots 7 layers, 14 slots 2 layers, 14 slots 4 layers, 14 slots 6 layers, 14 slots 8 layers, 21 slots 1 layer, 21 slots Slots 3 layers, 21 slots 5 layers, and 21 slots 7 layers also occupy 4 stator slots. Among them, the position of the 3 slots occupied by the hairpin coil in the branch B2 relative to the rotor magnet N is the same as the position of the 21 slots occupied by the hairpin coil in the branch B4 relative to the rotor magnet S, and the position of the hairpin coil in the 3 slots in the branch B2 is the same as that of the rotor magnet S. They are located on the 1st floor, 3rd floor, 5th floor and 7th floor, respectively. The 21-slot hairpin coils in branch B4 are also located on 1st, 3rd, 5th and 7th floors respectively, that is, on the same floor; The position of the slot relative to the rotor magnet S is the same as the position of the slot 1 occupied by the hairpin coil in the branch B4 relative to the rotor magnet N, and the hairpin coil of the 7 slots in the branch B2 is located on the 2nd, 4th, 6th and 2nd floors, respectively. 8 layers, the hairpin coils of slot 1 in branch B4 are also located on the 2nd, 4th, 6th and 8th layers, that is, on the same layer; the 14 slots occupied by the hairpin coils in branch B2 are relative to the position of the rotor magnet N The position of the 8 slots occupied by the hairpin coils in branch B4 is the same as that of the rotor magnet S, the hairpin coils with 14 slots in branch B2 are located on the 1st, 3rd, 5th and 7th floors respectively, and the 8th slot in branch B4 The hairpin coils are also located on the 1st, 3rd, 5th and 7th floors respectively, that is, on the same floor; the position of the 20 slots occupied by the hairpin coils in branch B2 relative to the rotor magnet S is the same as the position of the 14 slots occupied by the hairpin coils in branch B4 Relative to the position of the rotor magnet N, the hairpin coils with 20 slots in branch B2 are located on the 2nd, 4th, 6th and 8th floors respectively, and the hairpin coils with 14 slots in branch B4 are also located on the 2nd and 4th floors respectively. , 6 layers and 8 layers, that is, on the same layer. It can be seen that the branch circuit B2 and the branch circuit B4 have the following three characteristics at the same time: 1. The number of stator slots occupied by each hairpin coil is the same, 2. The position of the stator slot where each hairpin coil is located is the same relative to each magnet steel on the rotor, 3. The hairpin coils in each stator slot are on the same layer. Therefore, the back EMF induced by the branch B2 is equal to the back EMF induced by the branch B4, so that there is no potential difference between the branch B2 and the branch B4, and there will be no circulating current between the branch B2 and the branch B4.

Similarly, there is no circulation between the other four pairs of branches.

It can be seen from Figure 2 that the hairpin coils in the 4 parallel branches occupy all 8 layers under a pair of poles, and occupy each layer only once.

As can be seen from Figure 1, the winding paths of the four parallel branches of the B phase are as follows:

Branch B1:

2 slots 1 layer - 8 slots 2 layers - 15 slots 1 layer - 19 slots 2 layers - 26 slots 1 layer - 32 slots 2 layers - 39 slots 1 layer - 43 slots 2 layers - 2 slots 3 layers - 8 slots 4 layers - 15 slots 3 layers-19 slots 4 layers-26 slots 3 layers-32 slots 4 layers-39 slots 3 layers-43 slots 4 layers-2 slots 5 layers-8 slots 6 layers-15 slots 5 layers-19 slots 6 layers- 26 slots 5 layers - 32 slots 6 layers - 39 slots 5 layers - 43 slots 6 layers - 2 slots 7 layers - 8 slots 8 layers - 15 slots 7 layers - 19 slots 8 layers - 26 slots 7 layers - 32 slots 8 layers - 39 slots 7 layers - 43 slots 8 layers.

Among them, the outgoing end of the first layer of slot 2 and layer 1 is the power supply end B1 of the winding, which is used for external AC power supply, and the outgoing end of the end end of slot 43 and layer 8 is the winding neutral point Y1. The branch has 16 complete hairpin coils, each hairpin coil is a different layer jumper between adjacent layers, and the adjacent layers are selected from 1-2 layers, 3-4 layers, 5-6 layers and The four layers of 7-8 layers, that is, from layers 1-8, constitute the adjacent layer every two layers in order, which has strong regularity and simplifies the cross-line structure. It can also be found that the hairpin coils in the branch circuit B1 occupy all the layers from the first to the eighth. In addition, the spans of the hairpin coils have two kinds of full pitch 6 and short pitch 4, and these two spans appear alternately at intervals.

Branch B2:

3 slots 1 layer-7 slots 2 layers-14 slots 1 layer-20 slots 2 layers-27 slots 1 layer-31 slots 2 layers-38 slots 1 layer-44 slots 2 layers-3 slots 3 layers-7 slots 4 layers- 14 slots 3 layers-20 slots 4 layers-27 slots 3 layers-31 slots 4 layers-38 slots 3 layers-44 slots 4 layers-3 slots 5 layers-7 slots 6 layers-14 slots 5 layers-20 slots 6 layers- 27 slots 5 layers - 31 slots 6 layers - 38 slots 5 layers - 44 slots 6 layers - 3 slots 7 layers - 7 slots 8 layers - 14 slots 7 layers - 20 slots 8 layers - 27 slots 7 layers - 31 slots 8 layers - 38 slots 7 layers - 44 slots 8 layers.

Among them, the outgoing end of the first layer of slot 3 is the power supply end B2 of the winding, which is used for external AC power supply, and the outgoing end of the 44 slot and the eight layer of the end end is the neutral point Y2 of the winding. The branch has 16 complete hairpin coils, each hairpin coil is a different layer jumper between adjacent layers, and the adjacent layers are selected from 1-2 layers, 3-4 layers, 5-6 layers and The four layers of 7-8 layers, that is, from layers 1-8, constitute the adjacent layer every two layers in order, which has strong regularity and simplifies the cross-line structure. It can also be found that the hairpin coils in the branch circuit B2 occupy all the layers from the first to the eighth. In addition, the spans of the hairpin coils have two kinds of full pitch 6 and short pitch 4, and these two spans appear alternately at intervals.

Branch B3:

2 slots 8 layers-44 slots 7 layers-37 slots 8 layers-33 slots 7 layers-26 slots 8 layers-20 slots 7 layers-13 slots 8 layers-9 slots 7 layers-2 slots 6 layers-44 slots 5 layers- 37 slots 6 layers - 33 slots 5 layers - 26 slots 6 layers - 20 slots 5 layers - 13 slots 6 layers - 9 slots 5 layers - 2 slots 4 layers - 44 slots 3 layers - 37 slots 4 layers - 33 slots 3 layers - 26 slots 4 layers - 20 slots 3 layers - 13 slots 4 layers - 9 slots 3 layers - 2 slots 2 layers - 44 slots 1 layer - 37 slots 2 layers - 33 slots 1 layer - 26 slots 2 layers - 20 slots 1 layer - 13 slots 2 layers - 9 slots 1 layer.

Among them, the outgoing end of the 2 slots and 8 layers of the starting end is the power supply end B3 of the winding, which is used for external AC power supply, and the outgoing end of the 9 slots and 1 layer of the end end is the winding neutral point Y3. The branch has 16 complete hairpin coils, each hairpin coil is a different layer jumper between adjacent layers, and the adjacent layers are selected from 1-2 layers, 3-4 layers, 5-6 layers and The four layers of 7-8 layers, that is, from layers 1-8, constitute the adjacent layer every two layers in order, which has strong regularity and simplifies the cross-line structure. It can also be found that the hairpin coils in the branch B3 occupy all the layers from the first to the eighth. In addition, the spans of the hairpin coils have two kinds of full pitch 6 and short pitch 4, and these two spans appear alternately at intervals.

Branch Road B4:

1 slot 8 layers - 45 slots 7 layers - 38 slots 8 layers - 32 slots 7 layers - 25 slots 8 layers - 21 slots 7 layers - 14 slots 8 layers - 8 slots 7 layers - 1 slot 6 layers - 45 slots 5 layers - 38 slots 6 layers - 32 slots 5 layers - 25 slots 6 layers - 21 slots 5 layers - 14 slots 6 layers - 8 slots 5 layers - 1 slots 4 layers - 45 slots 3 layers - 38 slots 4 layers - 32 slots 3 layers - 25 slots 4 layers - 21 slots 3 layers - 14 slots 4 layers - 8 slots 3 layers - 1 slots 2 layers - 45 slots 1 layer - 38 slots 2 layers - 32 slots 1 layer - 25 slots 2 layers - 21 slots 1 layer - 14 slots 2 layers - 8 slots 1 layer.

Among them, the outgoing end of the 1st slot and 8th layer of the starting end is the power supply end B4 of the winding, which is used for external AC power supply, and the outgoing end of the 8th slot and 1st layer of the end end is the winding neutral point Y4. The branch has 16 complete hairpin coils, each hairpin coil is a different layer jumper between adjacent layers, and the adjacent layers are selected from 1-2 layers, 3-4 layers, 5-6 layers and The four layers of 7-8 layers, that is, from layers 1-8, constitute the adjacent layer every two layers in order, which has strong regularity and simplifies the cross-line structure. It can also be found that the hairpin coils in the branch B4 occupy all the layers from the first to the eighth. In addition, the spans of the hairpin coils have two kinds of full pitch 6 and short pitch 4, and these two spans appear alternately at intervals.

The above embodiment only takes the B phase as an example. The four parallel branches of the A phase and the C phase have the same arrangement structure and the beneficial effects brought by the B phase, which will not be repeated here.

Even the hairpin coils of the same span have different sizes as long as the number of layers in the stator slots are different, so that the hairpin coils of the same span have multiple sizes. In each parallel branch, the hairpin coils of each span span between the above four adjacent layers, so a total of 8 sizes of hairpin coils are required, and correspondingly 8 kinds of molds are required to make these 8 hairpin coils. The stator winding of the existing structure often has more than 10 types of hairpin coils, and the types of hairpin coils are reduced, and the required molds are correspondingly reduced, which can improve production efficiency and reduce costs.

The embodiment of the motor stator assembly of the present utility model is used for a three-phase permanent magnet synchronous motor with 48 stator slots and 8 motor poles, including the three-phase stator winding described in any of the above-mentioned three-phase stator winding embodiments, At least it has all the beneficial effects brought by the technical solutions of any embodiment of the above three-phase stator winding.

In the embodiment of the motor of the present invention, the motor is a three-phase permanent magnet synchronous motor with 8 poles and 48 stator slots, including the motor stator assembly described in the above-mentioned embodiment of the motor stator assembly, at least having the above-mentioned motor stator assembly. All the beneficial effects brought by the technical solution of any embodiment of the three-phase stator winding.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical concept of the present invention, a variety of simple modifications can be made to the technical solutions of the present invention, including the combination of various specific technical features in any suitable manner. The combination method is not specified otherwise. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention, and all belong to the protection scope of the present invention.

Claims (10)

1. A three-phase stator winding is characterized by comprising N layers of hairpin windings which are sequentially overlapped, wherein N is more than or equal to 4 and is an even number; each phase of stator winding comprises M parallel branches, and M is an integral multiple of 4;

in each phase of stator winding, in each pair of parallel branches, the number of stator slots occupied by each hairpin coil in one branch is the same as that occupied by each hairpin coil in the other branch, the position of each stator slot where each hairpin coil in one branch is located relative to each magnetic steel on the rotor is the same as that of each stator slot where each hairpin coil in the other branch is located relative to each magnetic steel on the rotor, and the hairpin coils in each stator slot in one branch and the hairpin coils in each stator slot in the other branch are in the same layer;

the welding end of the hairpin coil is on the same side as the wire outlet end of the winding.

2. A three-phase stator winding according to claim 1, wherein the number of stator slots is 48, the number of motor poles is 8, N-8, and M-4.

3. The three-phase stator winding according to claim 2, wherein the hairpin coils in each leg occupy all of the first through eighth layers.

4. A three-phase stator winding according to claim 3, wherein the hairpin coils in each leg occupy only once per layer under a pair of poles.

5. A three-phase stator winding according to any of claims 2 to 4, wherein the hairpin coils in each branch are hetero-layered overlines.

6. The three-phase stator winding according to claim 5, wherein the different-layer flying leads are flying leads between adjacent layers, and the adjacent layers are any one of four layers of 1-2 layers, 3-4 layers, 5-6 layers and 7-8 layers.

7. The three-phase stator winding according to claim 6, wherein each branch of each phase stator winding includes 16 complete hairpin coils, and the span of each hairpin coil has both a full pitch and a short pitch, and the two spans alternate in interval.

8. The three-phase stator winding according to claim 7, wherein the short pitch is 4.

9. A stator assembly for an electrical machine comprising a three-phase stator winding according to any one of claims 1 to 8.

10. An electric machine comprising the electric machine stator assembly of claim 9.

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