New energy automobile motor stator winding structure

Abstract

A new energy automobile motor stator winding structure comprises a stator iron core and a stator winding, the stator iron core is provided with a plurality of winding grooves, the number of the winding grooves is at least six times of that of three, a plurality of layers of flat wire conductors used for forming the stator winding are arranged in each winding groove, the flat wire conductors are hairpin coils, the first layer of flat wire conductor is located on the inner circle of the winding, and the second layer of flat wire conductor is located on the outer circle of the winding. The last layer of flat wire conductor is located on the outer circle of the winding, the stator winding comprises a U-phase winding, a V-phase winding and a W-phase winding, each pole of each phase winding occupies three winding grooves, each phase winding comprises a plurality of coil groups, each coil group comprises two span structures, the three pitches of the first span structure are eight grooves, eight grooves and adjacent layer span combination of the eight grooves, and the three pitches of the second span structure are eight grooves. Three pitches of the second span structures are adjacent layer span combinations of 6 slots, 8 slots and 10 slots, the number of the first span structures and the number of the second span structures in each coil group are even numbers, and the sum of the number of the first span structures and the number of the second span structures in each coil group is equal to the number of poles of a motor stator.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle motors, and in particular to a stator winding structure for a new energy vehicle motor. Background Technology

[0002] With the development of new energy vehicle technology, the proportion of new energy vehicles is increasing year by year. The high performance, quietness, and low price of these vehicles undoubtedly give them an absolute advantage. Low price equates to low cost, and superior electromagnetic and structural solutions have a significant impact on cost. As the driving device of new energy vehicles, the performance, quietness, and cost of the drive motor are particularly important. The stator, as a key component of the drive motor, directly affects the cost of the three-phase busbar and motor housing due to the location of its lead wires; centralized lead wires result in lower costs. Furthermore, superior NVH (noise, vibration, and harshness) directly impacts the quietness and comfort of the vehicle. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a stator winding structure for a new energy vehicle motor. Its stator winding is a short-pitch winding, which can cancel out some electromagnetic harmonics and improve the motor's NVH performance.

[0004] The technical solution of this utility model is as follows: a stator winding structure for a new energy vehicle motor, comprising a stator core and a stator winding. The stator core is provided with multiple winding slots, the number of which is at least three times six. Each winding slot is provided with multiple layers of flat wire conductors for constituting the stator winding. The flat wire conductors are hairpin coils. The first layer of flat wire conductors is located on the inner circle of the winding, and the last layer of flat wire conductors is located on the outer circle of the winding. The stator winding includes three-phase windings: U-phase, V-phase, and W-phase. Each pole of each phase winding occupies three winding slots. Each phase winding includes multiple coil groups. The coil groups include two span structures. The first span structure has three pitches that are adjacent layer spans of 8 slots, 8 slots, and 8 slots. The second span structure has three pitches that are adjacent layer spans of 6 slots, 8 slots, and 10 slots. The number of first and second span structures in each coil group is even, and the sum of the number of first and second span structures in each coil group is equal to the number of stator poles of the motor.

[0005] Preferably, the winding groove is provided with an even number of flat wire conductors, and at least four layers of flat wire conductors are provided.

[0006] Preferably, the coil assembly consists of two adjacent layers of flat wire conductors.

[0007] Preferably, the hairpin coil includes a crown end, a straight section, and a twisted section, wherein the straight section is a flat wire conductor inserted into the winding groove.

[0008] Preferably, each phase winding includes two branches, and the two branches of each phase winding are introduced from the first layer of two adjacent winding slots and led out from the first layer of another two adjacent winding slots.

[0009] Preferably, the stator winding is a short-pitch winding, and the flat wire conductors in some of the winding slots are not of the same phase.

[0010] The advantages of this utility model are:

[0011] 1. The average pitch of each coil group of the stator winding of this utility model is 8, and the pole pitch of the motor is 9. The average pitch of each coil group of the stator winding is smaller than the pole pitch of the motor. Therefore, the stator winding of this utility model is a short-pitch winding. The short-pitch winding can reduce the harmonic content in the electromotive force to a large extent, thereby improving the waveform of the fundamental electromotive force and making the motor NVH performance better. At the same time, the short-pitch winding has a higher power factor, making the motor more efficient.

[0012] 2. The three-phase input and output lines of this utility model are more concentrated, which can reduce the number of three-phase busbars used and reduce the volume of the motor housing, thereby reducing costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the planar connection of the U-phase winding of this utility model;

[0014] Figure 2 This is a schematic diagram of the crown end of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the toggle end of this utility model;

[0016] Figure 4 This is a schematic diagram of the first coil group of the U-phase winding of this utility model;

[0017] Figure 5 This is a schematic diagram of the first coil group structure of the three-phase winding of U-phase, V-phase, and W-phase of this utility model.

[0018] Figure 6 This is a schematic diagram of the hairpin coil structure with a span of 6 slots, 8 slots, and 10 slots according to this utility model. Detailed Implementation

[0019] See Figures 1 to 6A stator winding structure for a new energy vehicle motor includes a stator core and stator windings. The stator core has 72 winding slots, and each winding slot contains six layers of flat wire conductors for forming the stator windings. The first layer of flat wire conductors is located on the inner circle of the winding, and the sixth layer of flat wire conductors is located on the outer circle of the winding. The flat wire conductors are hairpin coils, each hairpin coil including a crown end, a straight section, and a twisted section. The straight section is the flat wire conductor inserted into the winding slot. The stator windings include three-phase windings: U-phase, V-phase, and W-phase. Each pole of each phase winding occupies three winding slots. Each phase winding includes two branches, which are introduced from the first layer of two adjacent winding slots and led out from the first layer of another two adjacent winding slots. This concentrates the three-phase input and output lines, reducing the number of three-phase busbars and the size of the motor housing, thereby reducing costs. Each phase winding includes multiple coil groups, each composed of two adjacent layers of flat wire conductors. In this embodiment, three coil groups are provided. Each coil group includes two span structures: the first span structure has three pitches of adjacent layers of 8-slot, 8-slot, and 8-slot spacing; the second span structure has three pitches of adjacent layers of 6-slot, 8-slot, and 10-slot spacing. The number of first and second span structures in each coil group is even, and the sum of the number of first and second span structures in each coil group is equal to the number of stator poles of the motor. The stator winding is a short-pitch winding, where the flat wire conductors in some winding slots are not of the same phase. The short-pitch winding significantly reduces the harmonic content in the electromotive force, thereby improving the waveform of the fundamental electromotive force and resulting in better NVH performance of the motor. Simultaneously, the short-pitch winding has a higher power factor, leading to higher motor efficiency.

[0020] In this embodiment of the invention, any winding slot on the stator core is designated as the first winding slot. The slots are numbered clockwise from the first winding slot, with the last winding slot designated as the 72nd winding slot. The first and 72nd winding slots are adjacent to each other. Each winding slot contains six layers of flat wire conductors. The layer closest to the stator center is designated as the first layer, and the layers are arranged radially, with the layer furthest from the stator center designated as the sixth layer. (See also...) Figure 1Taking the U-phase as an example, the U-phase winding structure includes two branches. The first and second layers of flat wire conductors form the first coil group of the U-phase winding, the third and fourth layers of flat wire conductors form the second coil group of the U-phase winding, and the fifth and sixth layers of flat wire conductors form the third coil group of the U-phase winding. In this embodiment, taking the winding of the first coil group of the U-phase winding as an example, in the first branch of the U-phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the first winding slot, and another straight segment is placed in the second layer of the ninth winding slot; a straight segment of another hairpin coil with a span of 8 slots is placed in the first layer of the third winding slot, and another straight segment is placed in the second layer of the eleventh winding slot; in the second branch of the U-phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the second winding slot, and another straight segment is placed in the second layer of the tenth winding slot; the above three hairpin coils with a span of 8 slots constitute the first span structure.

[0021] In the first branch of the U phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the 11th winding slot, and another straight segment is placed in the second layer of the 19th winding slot. In the second branch of the U phase, a straight segment of a hairpin coil with a span of 10 slots is placed in the first layer of the 10th winding slot, and another straight segment is placed in the second layer of the 20th winding slot. A straight segment of a hairpin coil with a span of 6 slots is placed in the first layer of the 12th winding slot, and another straight segment is placed in the second layer of the 18th winding slot. The above three hairpin coils with spans of 8 slots, 10 slots, and 6 slots respectively constitute the second span structure.

[0022] In the first branch of the U phase, a straight segment of a hairpin coil with a span of 10 slots is placed in the first layer of the 19th winding slot, and another straight segment is placed in the second layer of the 29th winding slot; a straight segment of a hairpin coil with a span of 6 slots is placed in the first layer of the 21st winding slot, and another straight segment is placed in the second layer of the 27th winding slot; in the second branch of the U phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the 20th winding slot, and another straight segment is placed in the second layer of the 28th winding slot; the above three hairpin coils with spans of 10 slots, 6 slots, and 8 slots respectively constitute the second span structure.

[0023] In the first branch of the U-phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the 29th winding slot, and another straight segment is placed in the second layer of the 37th winding slot. In the second branch of the U-phase, a straight segment of a hairpin coil with a span of 10 slots is placed in the first layer of the 28th winding slot, and another straight segment is placed in the second layer of the 38th winding slot. A straight segment of a hairpin coil with a span of 6 slots is placed in the first layer of the 30th winding slot, and another straight segment is placed in the second layer of the 36th winding slot. The above three hairpin coils with spans of 8 slots, 10 slots, and 6 slots respectively constitute the second span structure.

[0024] In the first branch of the U phase, a straight segment of a hairpin coil with a span of 10 slots is placed in the first layer of the 37th winding slot, and another straight segment is placed in the second layer of the 47th winding slot; a straight segment of a hairpin coil with a span of 6 slots is placed in the first layer of the 39th winding slot, and another straight segment is placed in the second layer of the 45th winding slot; in the second branch of the U phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the 38th winding slot, and another straight segment is placed in the second layer of the 46th winding slot; the above three hairpin coils with spans of 10 slots, 6 slots, and 8 slots respectively constitute the second span structure.

[0025] In the first branch of the U-phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the 47th winding slot, and another straight segment is placed in the second layer of the 55th winding slot. In the second branch of the U-phase, a straight segment of a hairpin coil with a span of 10 slots is placed in the first layer of the 46th winding slot, and another straight segment is placed in the second layer of the 56th winding slot. A straight segment of a hairpin coil with a span of 6 slots is placed in the first layer of the 48th winding slot, and another straight segment is placed in the second layer of the 54th winding slot. The above three hairpin coils with spans of 8 slots, 10 slots, and 6 slots respectively constitute the second span structure.

[0026] In the first branch of the U phase, a straight segment of a hairpin coil with a span of 10 slots is placed in the first layer of the 55th winding slot, and another straight segment is placed in the second layer of the 65th winding slot; a straight segment of a hairpin coil with a span of 6 slots is placed in the first layer of the 57th winding slot, and another straight segment is placed in the second layer of the 63rd winding slot; in the second branch of the U phase, a straight segment of a hairpin coil with a span of 8 slots is placed in the first layer of the 56th winding slot, and another straight segment is placed in the second layer of the 64th winding slot; the above three hairpin coils with spans of 10 slots, 6 slots, and 8 slots respectively constitute the second span structure.

[0027] In the first branch of the U phase, a straight segment of a hairpin coil with an 8-slot span is placed in the first layer of the 65th winding slot, and another straight segment is placed in the second layer of the 1st winding slot. In the second branch of the U phase, a straight segment of a hairpin coil with an 8-slot span is placed in the first layer of the 64th winding slot, and another straight segment is placed in the second layer of the 72nd winding slot. A straight segment of another hairpin coil with an 8-slot span is placed in the first layer of the 66th winding slot, and another straight segment is placed in the second layer of the 2nd winding slot. The above three hairpin coils with an 8-slot span constitute the first span structure.

[0028] See Figure 4The first coil group of the U-phase winding is wound according to the above winding method. The first coil group of the U-phase winding has a total of 2 first span structures and 6 second span structures, both of which are even numbers. The sum of the number of first span structures and second span structures is 8, which is equal to the number of 8 poles of the motor stator. The winding method of the second and third coil groups of the U-phase winding is the same as that of the first coil group, except that the number of layers in which the hairpin coil is located is different.

[0029] The winding methods for the V-phase and W-phase windings are the same as those for the U-phase winding. The V-phase winding can be obtained by moving the U-phase winding three slots clockwise along the circumference of the stator core winding slot. Similarly, the W-phase winding can be obtained by moving the V-phase winding three slots clockwise along the circumference of the stator core winding slot.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A stator winding structure for a new energy vehicle motor, comprising a stator core and a stator winding, wherein the stator core has multiple winding slots, the number of which is at least three to twelve times, and each winding slot contains multiple layers of flat wire conductors for forming the stator winding, wherein the flat wire conductors are hairpin coils, wherein... The first layer of flat wire conductors is located on the inner circle of the winding, and the last layer of flat wire conductors is located on the outer circle of the winding. The stator winding includes three-phase windings: U-phase, V-phase, and W-phase. Each pole of each phase winding occupies three winding slots. The stator winding is characterized in that each phase winding includes multiple coil groups, and the coil groups include two types of span structures. The first span structure has three pitches that are adjacent layer span combinations of 8 slots, 8 slots, and 8 slots. The second span structure has three pitches that are adjacent layer span combinations of 6 slots, 8 slots, and 10 slots. The number of first and second span structures in each coil group is even, and the sum of the number of first and second span structures in each coil group is equal to the number of stator poles of the motor.

2. The stator winding structure of a new energy vehicle motor according to claim 1, characterized in that: The winding groove is provided with an even number of flat wire conductors, and at least four layers of flat wire conductors are provided.

3. The stator winding structure of a new energy vehicle motor according to claim 1, characterized in that: The coil assembly consists of two adjacent layers of flat wire conductors.

4. The stator winding structure of a new energy vehicle motor according to claim 1, characterized in that: The hairpin coil includes a crown end, a straight section, and a twisted section, wherein the straight section is a flat wire conductor inserted into the winding groove.

5. The stator winding structure of a new energy vehicle motor according to claim 1, characterized in that: Each phase winding includes two branches, which are introduced from the first layer of two adjacent winding slots and led out from the first layer of another two adjacent winding slots.

6. The stator winding structure of a new energy vehicle motor according to claim 1, characterized in that: The stator winding is a short-pitch winding, and the flat wire conductors in some of the winding slots are not of the same phase.

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