A stator winding of a rotary electric machine

Abstract

A stator winding of a rotating electric machine includes a stator core and stator windings. The stator core has 72 winding slots, each slot having an even number of conductor layers for forming the stator windings, with the same number of conductor layers. The first conductor layer is on the outer circumference of the winding, and the last layer is on the inner circumference. The stator windings include three-phase windings (U, V, and W), each phase winding having 8 poles, with each pole occupying three slots per phase. Each phase winding has four parallel branches, each branch consisting of multiple dissimilar winding structures connected together. The total span of the non-layered winding structure is 97 slots, with span combinations of 9 slots and 8 slots. The two non-layered winding structures are connected by 11 slots. Each branch is introduced from the odd-numbered slots and led out from the even-numbered slots. The first and second parallel branches are introduced with the same pole, while the third and fourth parallel branches are introduced with the same pole. The first and third parallel branches are introduced from the first layer of the winding and have the same winding direction. The second and fourth parallel branches are introduced from the last layer of the winding and have the opposite winding direction to the first and third parallel branches.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to a stator winding of a rotating electric motor. Background Technology

[0002] Currently, the mainstream drive motor configuration in the new energy vehicle industry is the 48-slot 8-pole motor. However, the 72-slot 8-pole motor, compared to the commonly used 48-slot 8-pole motor, increases the number of slots per pole per phase and the slot harmonic order. Under the same conditions, the 72-slot 8-pole motor has a relatively better NVH performance. Moreover, the increase in the number of slots improves the motor's torque and power density. Therefore, new energy vehicles equipped with 72-slot 8-pole motors have a better driving experience. Summary of the Invention

[0003] This invention provides a stator winding for a rotating electric motor, suitable for a 72-slot, 8-phase, 4-branch rotating electric motor. Its winding structure is simple and can make the three-phase windings of the motor reach balance. Theoretically, there is no current circulation, which improves the performance of the motor.

[0004] A stator winding of a rotating electric motor includes a stator core and a stator winding. The stator core has 72 winding slots, and each winding slot contains an even number of conductor layers for forming the stator winding. The number of conductor layers in each winding slot is the same. The first conductor layer is located on the outer circumference of the winding, and the last conductor layer is located on the inner circumference of the winding. The stator winding includes three-phase windings: U-phase, V-phase, and W-phase. Each phase winding has 8 poles, and each pole and each phase occupies three winding slots. Each phase winding includes four parallel branches, and each parallel branch has multiple layers. The winding structures are connected together. Each non-layer winding structure has a total of 97 slots. The slot combinations include 9 slots and 8 slots. Two non-layer winding structures are connected by 11 slots. Each parallel branch is introduced from the odd-numbered slots and led out from the even-numbered slots. The first and second parallel branches are introduced with the same pole, and the third and fourth parallel branches are introduced with the same pole. The first and third parallel branches are introduced from the first layer of the winding and have the same winding direction. The second and fourth parallel branches are introduced from the last layer of the winding and have the opposite winding direction to the first and third parallel branches.

[0005] Preferably, the heterogeneous winding structure consists of two adjacent layers of conductors, and the heterogeneous winding structure is wound in a pattern of 9 slots, 9 slots, 9 slots, and 8 slots.

[0006] Preferably, the positions of the parallel branch lead-in line and lead-out line can be spaced 45°, 135° and 180° apart.

[0007] Preferably, the positions of the lead-out or lead-in lines of the same parallel branch and the same layer of the U-phase winding and the V-phase winding can be spaced apart by 15°, 30°, 60°, 75°, 105°, or 120°, and the positions of the lead-out or lead-in lines of the same parallel branch and the same layer of the V-phase winding and the W-phase winding can be spaced apart by 15°, 30°, 60°, 75°, 105°, or 120°.

[0008] Benefits of the present invention:

[0009] The stator winding of this invention is a three-phase fully balanced winding, which theoretically has no current circulation. That is, there is no inter-branch circulation in the parallel branches of the same phase winding, and no inter-phase current circulation between different phase windings. This solves the problems of winding overheating, low motor efficiency and NVH caused by electromagnetic imbalance caused by three-phase winding imbalance, and greatly improves the performance of the motor. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the U-phase winding of the present invention.

[0011] Figure 2 This is a schematic diagram of the first parallel branch of the U-phase winding of the present invention;

[0012] Figure 3 This is a schematic diagram of the second parallel branch of the U-phase winding of the present invention;

[0013] Figure 4 This is a schematic diagram of the third parallel branch of the U-phase winding of the present invention;

[0014] Figure 5 This is a schematic diagram of the fourth parallel branch of the U-phase winding of the present invention;

[0015] Figure 6 This is a schematic diagram of the first parallel branch of the V-phase winding of the present invention.

[0016] Figure 7 This is a schematic diagram of the second parallel branch of the V-phase winding of the present invention;

[0017] Figure 8 This is a schematic diagram of the third parallel branch of the V-phase winding of the present invention;

[0018] Figure 9 This is a schematic diagram of the fourth parallel branch of the V-phase winding of the present invention;

[0019] Figure 10 This is a schematic diagram of the first parallel branch of the W-phase winding of the present invention.

[0020] Figure 11 This is a schematic diagram of the second parallel branch of the W-phase winding of the present invention;

[0021] Figure 12This is a schematic diagram of the third parallel branch of the W-phase winding of the present invention;

[0022] Figure 13 This is a schematic diagram of the fourth parallel branch of the W-phase winding of the present invention. Detailed Implementation

[0023] See Figures 1 to 13 A stator winding of a rotating electric motor includes a stator core and a stator winding. The stator core has 72 winding slots, and each winding slot contains an even number of conductor layers for forming the stator winding. In this embodiment, there are eight conductor layers, with the same number of conductor layers in each winding slot. The first conductor layer is located on the outer circumference of the winding, and the eighth conductor layer is located on the inner circumference of the winding. The stator winding includes three-phase windings: U-phase, V-phase, and W-phase. Each phase winding has eight poles, with each pole and each phase occupying three winding slots. Each phase winding includes four parallel branches. The branch is composed of multiple heterogeneous winding structures connected together. In this embodiment, each parallel branch includes four heterogeneous winding structures. The heterogeneous winding structure is composed of two adjacent conductors. In this embodiment, there is a heterogeneous winding structure composed of the first and second layers, a heterogeneous winding structure composed of the third and fourth layers, a heterogeneous winding structure composed of the fifth and sixth layers, and a heterogeneous winding structure composed of the seventh and eighth layers. The heterogeneous winding structures are wound in a pattern of 9 slots, 9 slots, 9 slots, and 8 slots. Each non-layer winding structure has a total of 97 slots, with slot combinations including 9 and 8 slots. Two non-layer winding structures are connected by 11 slots. Each parallel branch is introduced from an odd-numbered slot and led out from an even-numbered slot. The first and second parallel branches are introduced with the same pole, while the third and fourth parallel branches are introduced with the same pole. The first and third parallel branches are introduced from the first layer of the winding and have the same winding direction. The second and fourth parallel branches are introduced from the last layer of the winding and have the opposite winding direction to the first and third parallel branches. The positions of the parallel branch introduction and lead-out lines can be spaced 45°, 135°, and 180° apart. The positions of the lead-out or lead-in lines of the same parallel branch and the same layer of the U-phase winding and the V-phase winding can be spaced apart by 15°, 30°, 60°, 75°, 105°, or 120°. The positions of the lead-out or lead-in lines of the same parallel branch and the same layer of the V-phase winding and the W-phase winding can be spaced apart by 15°, 30°, 60°, 75°, 105°, or 120°.

[0024] An embodiment of the present invention provides a stator winding of a rotating electric motor. Taking the U-phase as an example, the winding method of the first parallel branch of the U-phase winding structure is as follows: the winding connected to the lead U1 first enters from the first layer of the 3rd winding slot, then enters the second layer of the 12th winding slot with a span of 9 slots, then enters the first layer of the 21st winding slot with a span of 9 slots, then enters the second layer of the 30th winding slot with a span of 9 slots, then enters the first layer of the 38th winding slot with a span of 8 slots, then enters the second layer of the 47th winding slot with a span of 9 slots, then enters the first layer of the 56th winding slot with a span of 9 slots, then enters the second layer of the 65th winding slot with a span of 8 slots, then enters the first layer of the 1st winding slot with a span of 8 slots, then enters the second layer of the 10th winding slot with a span of 9 slots, then enters the first layer of the 19th winding slot with a span of 9 slots, and then enters the second layer of the 21st winding slot with a span of 9 slots. At this time, the total span of slots is... With 97 slots, the first and second layers of the non-layered winding structure are completed. Then, with a span of 11 slots, the third layer of the 39th winding slot is entered. The third and fourth layers of the non-layered winding structure are started with spans of 9 slots, 9 slots, 9 slots, and 8 slots. When the total number of slots reaches 97 again, the non-layered winding structure of the third and fourth layers is completed. Then, with a span of 11 slots, the fifth layer is entered. The fifth and sixth layers of the non-layered winding structure are started with spans of 9 slots, 9 slots, 9 slots, and 8 slots. When the total number of slots reaches 97 again, the non-layered winding structure of the fifth and sixth layers is completed. Then, with a span of 11 slots, the seventh layer is entered. The seventh and eighth layers of the non-layered winding structure are started with spans of 9 slots, 9 slots, 9 slots, and 8 slots. Finally, it is connected to the lead X1 of the 8th layer of the 64th winding slot, thus completing the winding of the first branch of the U-phase winding structure.

[0025] The winding method of the second parallel branch of the U-phase winding structure is as follows: the winding connected to the lead U2 first enters from the 8th layer of the first winding slot, and then begins to wind the seventh and eighth layers of the non-layer winding structure with a span of 9 slots, 9 slots, 9 slots, and 8 slots. The winding direction is opposite to the winding direction of the first parallel branch of the U-phase winding structure. When the total number of slots reaches 97, it enters the 6th layer with a span of 11 slots, and then enters the 6th layer with a span of 9 slots, 9 slots, 9 slots, and 8 slots. Following the pattern, the fifth and sixth layers of the winding structure are wound separately. When the total number of slots reaches 97, the fourth layer is entered with a span of 11 slots. Then, the third and fourth layers of the winding structure are completed in the same way. When the total number of slots reaches 97 again, the second layer is entered with a span of 11 slots to complete the first and second layers of the winding structure. Finally, it is connected to the first layer lead X2 of the 12th winding slot, thus completing the winding of the second branch of the U-phase winding structure.

[0026] The winding method of the third parallel branch of the U-phase winding structure is as follows: the winding connected to the lead U3 first enters from the first layer of the 39th winding slot, and then starts to wind the first and second layers of the different-layer winding structure with a span of 9 slots, 9 slots, 9 slots, and 8 slots. The winding direction is the same as the winding direction of the first parallel branch of the U-phase winding structure. When the total number of slots reaches 97, it enters the third layer with a span of 11 slots. Then, the above pattern is repeated to complete the different-layer winding structure of the third and fourth layers. Then, it enters the fifth layer with a span of 11 slots. After completing the different-layer winding structure of the fifth and sixth layers, it enters the seventh layer with a span of 11 slots to complete the different-layer winding structure of the seventh and eighth layers. Finally, it is connected to the lead X3 of the 8th layer of the 28th winding slot, thus completing the winding of the third branch of the U-phase winding structure.

[0027] The winding method of the fourth parallel branch of the U-phase winding structure is as follows: the winding connected to the lead U4 first enters from the 8th layer of the 37th winding slot, and then starts to wind the seventh and eighth layers of the different-layer winding structure with a span of 9 slots, 9 slots, 9 slots, and 8 slots. The winding direction is the same as the winding direction of the second parallel branch of the U-phase winding structure. When the total number of slots reaches 97, it enters the 6th layer with a span of 11 slots. The above pattern is repeated to complete the different-layer winding structure of the fifth and sixth layers. Then, it enters the 4th layer with a span of 11 slots to complete the different-layer winding structure of the third and fourth layers. After that, it enters the 2nd layer with a span of 11 slots to complete the different-layer winding structure of the first and second layers. Finally, it is connected to the lead X4 of the 1st layer of the 48th winding slot, thus completing the winding of the fourth branch of the U-phase winding structure.

[0028] The V-phase winding and W-phase winding differ from the U-phase winding only in the positions of the lead-in and lead-out lines. The winding rules of the V-phase winding and W-phase winding are the same as those of the U-phase winding.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A stator winding of a rotating electric machine, comprising a stator winding provided on a stator core, the stator core having 72 winding slots, each winding slot having an even number of layers of conductors provided therein for constituting the stator winding, the number of layers of conductors in each winding slot being the same, wherein, The first layer of conductor is located on the outer circle of the winding, and the last layer of conductor is located on the inner circle of the winding. The stator winding includes three-phase windings: U-phase, V-phase, and W-phase. The characteristic feature is that each phase winding has 8 poles, each pole and each phase occupies three winding slots, and each phase winding includes four parallel branches. Each parallel branch is composed of multiple dissimilar winding structures connected together. The total number of slots spanned by each dissimilar winding structure is 97 slots, and the span combinations include 9 slots and 8 slots. The dissimilar winding structure is composed of two adjacent layers of conductors. The layered winding structure is wound in a repeating pattern of 9 slots, 9 slots, 9 slots, and 8 slots. Two different layered winding structures are connected by 11 slots. Each parallel branch is introduced from the odd-numbered slots and led out from the even-numbered slots. The first and second parallel branches are introduced with the same pole, while the third and fourth parallel branches are introduced with the same pole. The first and third parallel branches are introduced from the first layer of the winding and have the same winding direction. The second and fourth parallel branches are introduced from the last layer of the winding and have the opposite winding direction to the first and third parallel branches.

2. The stator winding of a rotating electric motor according to claim 1, characterized in that: The positions of the parallel branch lead-in line and lead-out line are spaced 45°, 135°, or 180° apart.

3. The stator winding of a rotating electric motor according to claim 1, characterized in that: The positional interval between the lead-out or lead-in lines of the same parallel branch and the same layer of the U-phase winding and the V-phase winding is 15°, 30°, 60°, 75°, 105°, or 120°. The positional interval between the lead-out or lead-in lines of the same parallel branch and the same layer of the V-phase winding and the W-phase winding is 15°, 30°, 60°, 75°, 105°, or 120°.

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