Hairpin wire motor stator

Abstract

A hairpin conductor motor stator comprises an iron core, a plurality of slots, and a plurality of hairpin conductors. The plurality of slots are located in the circumferential direction of the iron core, surrounding the rotor accommodation space, and forming a plurality of radially adjacent slot layers. The iron core comprises a plurality of pole regions, each pole region comprises a plurality of phases, and each phase comprises a plurality of phase slots. The plurality of hairpin conductors are used to be arranged in the slots of the phase slots of the same phase of the pole regions, and the hairpin conductors are connected to form a plurality of windings. The two ends of one of the windings are arranged in the leftmost phase slot and the rightmost phase slot of the phase slots of the same phase of the cross-pole region. The hairpin conductors comprise a plurality of cross-pole hairpin conductors, and the span of the cross-pole hairpin conductors on the insertion side is equal to the quotient obtained by dividing the total number of the phase slots by the total number of the pole regions plus 1 or minus 1.

Description

Technical Field

[0001] The present invention relates to a motor stator, and more particularly to a motor stator with a hairpin-shaped conductor. Background Art

[0002] Existing hairpin-wire motor stators often feature multiple parallel windings. One key design priority is balancing the voltages of the parallel windings to prevent circulating currents. Current wire winding methods often require multiple hairpin wires with varying spans to avoid circulating currents, increasing the complexity of motor stator manufacturing. Consequently, motor manufacturers are actively seeking suitable wire winding methods that can reduce circulating currents during motor operation and more effectively control the number of hairpin wires required and the complexity of manufacturing the motor stator. Summary of the Invention

[0003] The present invention provides a hairpin-shaped conductor stator to solve the problems of the prior art.

[0004] According to one embodiment of the present invention, a hairpin conductor motor stator includes an iron core, a plurality of slots, and a plurality of hairpin conductors. The iron core is annular and defines a rotor housing space at the center of the iron core. The iron core includes an insertion side and an extension side, allowing the hairpin conductors to be inserted from the insertion side and pass through the extension side. A plurality of slots are located on the iron core, circumferentially surrounding the rotor housing space and forming a plurality of radially adjacent slot layers. The iron core includes a plurality of pole regions, each of which includes a plurality of phases, each of which includes a plurality of phase slots, each of which is circumferentially adjacent and has at least a leftmost phase slot and a rightmost phase slot. Each phase slot includes these radially adjacent slots. A plurality of hairpin conductors are arranged in the slots of the phase slots of the same phase of the pole sections. The hairpin conductors are connected to form a plurality of windings, with the ends of one of the windings arranged in the leftmost and rightmost phase slots of the phase slots of the same phase across the pole sections. The hairpin conductors include a plurality of cross-pole hairpin conductors, and the span of the cross-pole hairpin conductors on the insertion side is equal to the quotient obtained by dividing the total number of phase slots by the total number of pole sections, plus or minus 1.

[0005] According to another embodiment of the present invention, a hairpin motor stator includes an iron core, a plurality of slots, and a plurality of hairpin conductors. The iron core is annular and defines a rotor housing space at its center. The iron core includes an insertion side and an extension side, allowing the hairpin conductors to be inserted from the insertion side and to pass through the extension side. The iron core includes a plurality of slots circumferentially surrounding the rotor housing space and forming a plurality of radially adjacent slot layers. The iron core includes a plurality of pole sections, each of which includes a plurality of phases, each of which includes a plurality of circumferentially adjacent phase slots, each of which includes radially adjacent slots. A plurality of hairpin conductors are arranged in the slots of the phase slots of the same phase in the pole sections. The hairpin conductors are connected to form a plurality of windings. Each winding is wound through two adjacent slot layers on the insertion side and the extension side, and has the following winding structure. Each winding is wound around the same phase of all the pole regions at the extension side with a span of one pole pitch. Each winding is wound around the first phase slot and the second phase slot of the same phase of all the pole regions at the insertion side, wherein the second phase slot is adjacent to the third phase slot which is one pole pitch away from the first phase slot.

[0006] According to another embodiment of the present invention, a hairpin conductor motor stator comprises a toroidal core, a plurality of slots, and a plurality of stator windings. The toroidal core comprises a first axial side and an opposite second side. The plurality of slots are located on the core for accommodating a plurality of hairpin conductors. The slots are arranged circumferentially around the core to form adjacent slots and a plurality of radially adjacent slot layers. The core comprises a plurality of pole regions, each of which comprises the slots. Each stator winding is formed by connecting the hairpin conductors arranged across the pole regions. All connected hairpin conductors span two adjacent slot layers in the radial direction, and the circumferential span on the first side is: one adjacent slot plus one pole pitch, one adjacent slot minus one pole pitch, or a combination of one adjacent slot plus one pole pitch and one adjacent slot minus one pole pitch.

[0007] In summary, the hairpin stator of the present invention utilizes the aforementioned winding method to allow a single winding to wind around each slot an equal number of times in multiple phase slots in adjacent slot layers within the corresponding U, V, and W phases, ensuring that all windings are evenly distributed across each slot, thus preventing the generation of circulating currents. Furthermore, at least one of the aforementioned winding methods also allows the number of windings connected in parallel per phase to be equal to the number of poles. At least one of the aforementioned embodiments can reduce the number of hairpin conductors, requiring only cross-pole hairpins and layer-change connecting conductors.

[0008] The above description will be described in detail below with reference to implementation examples, and a further explanation of the technical solution of the present invention will be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To make the above and other objects, features, advantages and embodiments of the present invention more apparent, the following descriptions of the accompanying drawings are given:

[0010] Figure 1 A circuit diagram showing a motor stator according to an embodiment of the present invention;

[0011] Figure 2 A side view of a motor stator showing an embodiment of the present invention;

[0012] Figure 3 A top view of a motor stator core according to an embodiment of the present invention is shown;

[0013] Figure 4 A schematic diagram showing one winding of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0014] Figure 5 A schematic diagram showing two windings of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0015] Figure 6 A schematic diagram showing the input and output wiring of the eight windings of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0016] Figure 7 A schematic diagram showing the input and output wiring of the eight windings of the V-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0017] Figure 8 A schematic diagram showing the input and output wiring of the eight windings of the W-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0018] Figure 9 A schematic diagram showing the input and output wiring of the eight windings of the U-phase, V-phase, and W-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0019] Figure 10 A schematic diagram showing one winding of a U-phase stator of a 72-slot motor using same-layer connecting wires according to an embodiment of the present invention is shown;

[0020] Figure 11 A schematic diagram illustrating the input and output wiring of the U-phase 4 windings of a 72-slot motor stator using inner same-layer connecting wires according to an embodiment of the present invention is shown;

[0021] Figure 12 A schematic diagram illustrating the input and output wiring of the U-phase 4 windings of a 72-slot motor stator using external same-layer connecting wires according to an embodiment of the present invention is shown;

[0022] Figure 13 A schematic diagram illustrating the input and output wiring of the U-phase 2 winding of a 72-slot motor stator using inner and outer same-layer connecting wires in an embodiment of the present invention;

[0023] Figure 14 A schematic diagram showing one winding of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0024] Figure 15 A schematic diagram showing one winding of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0025] Figure 16 A schematic diagram showing one winding of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0026] Figure 17 A schematic diagram showing one winding of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0027] Figure 18 A schematic diagram showing one winding of the U-phase of a 72-slot motor stator according to an embodiment of the present invention is shown;

[0028] Figure 19 A schematic diagram showing one winding of the U-phase of a 48-slot motor stator according to an embodiment of the present invention is shown;

[0029] Figure 20 A schematic diagram showing the input and output wiring of the eight windings of the U-phase of a 48-slot motor stator according to an embodiment of the present invention is shown;

[0030] Figure 21 A schematic diagram showing the input and output wiring of the eight windings of the V-phase of a 48-slot motor stator according to an embodiment of the present invention is shown;

[0031] Figure 22 A schematic diagram showing the input and output wiring of the eight windings of the W-phase of a 48-slot motor stator according to an embodiment of the present invention is shown;

[0032] Figure 23 A schematic diagram illustrating the input and output wiring of four windings of the U-phase of a 48-slot motor stator using same-layer connecting wires according to an embodiment of the present invention is shown;

[0033] Figure 24 A schematic diagram showing one winding of the U-phase of a 48-slot motor stator according to an embodiment of the present invention is shown;

[0034] Figure 25 A schematic diagram showing the input and output connections of the four windings of the U-phase of the 48-slot motor stator according to an embodiment of the present invention; and

[0035] Figure 26 A schematic diagram illustrating the input and output wiring of two windings of the U-phase of a 48-slot motor stator using same-layer connecting wires according to an embodiment of the present invention is shown.

[0036] Description of reference numerals:

[0037] 50: Circuit

[0038] 52: Electrically neutral terminal

[0039] U: phase

[0040] U1~U8:phase

[0041] V: Phase

[0042] V1~V8:phase

[0043] W: Phase

[0044] W1~W8:phase

[0045] Y1~Y8: Winding

[0046] YIJ1~YIJ4: Winding

[0047] YOJ1~YOJ4: winding

[0048] YIOJ1~YIOJ2: Winding

[0049] YF1~YF4: Winding

[0050] 100: Motor stator

[0051] 110: Iron core

[0052] 110a: Insertion side

[0053] 110b: Extended side

[0054] 120: Hairpin wire

[0055] 120a: Bend

[0056] 120b: feet

[0057] 120c: feet

[0058] 122: Wire

[0059] 124: Wire

[0060] 1-8: Polar Regions

[0061] L1~L6: Layer

[0062] A, B, C: Phase Trough

[0063] T1: Layer-changing connecting wire

[0064] T2: Layer-changing connecting wire

[0065] NC: Electrically neutral terminal

[0066] IJW1: Same-layer connecting wire

[0067] IJW2: Same-layer connecting wire

[0068] IJW3: Same-layer connecting wire

[0069] IJW4: Same-layer connecting wire

[0070] OJW1: Same-layer connecting wire

[0071] OJW2: Same-layer connecting wire

[0072] OJW3: Same-layer connecting wire

[0073] OJW4: Same-layer connecting wire

[0074]

Biological Material Deposit

[0075] Domestic storage information (please note the order of storage institution, date, and number)

[0076] none

[0077] Overseas deposit information (please note the order of deposit country, institution, date, and number)

[0078] none DETAILED DESCRIPTION

[0079] To make the description of the present invention more detailed and complete, reference may be made to the accompanying drawings and the various embodiments described below. The same numbers in the drawings represent the same or similar elements. On the other hand, well-known elements and steps are not described in the embodiments to avoid unnecessary limitations on the present invention. In the embodiments and claims, unless the context specifically limits the articles, "one" and "the" can refer to a single or multiple items. The terms "input line" and "output line" described in the specification have the same meaning (and can also be reversed). In addition, the term "clockwise winding" described in the specification is to help understand the relative positions of the input line / output line, and can also be understood as "counterclockwise winding" based on the relative positions of the input line / output line. In other words, from the perspective of mechanical configuration, there is no so-called input line / output line. From the perspective of the circuit, the positive [+] contact can be understood as the input line, and the negative [-] (neutral) contact can be understood as the output line.

[0080] Please refer to Figure 1 , which shows a circuit diagram of a motor stator according to an embodiment of the present invention. Circuit 50 includes windings for phases U, V, and W. Each phase winding (U, V, W) includes windings Y1 through YN connected in parallel. The negative terminal (i.e., YNout) of each winding YN is connected to an electrical neutral terminal (neutral end) 52 (in other words, each winding has YN terminals connected to the electrical neutral terminal). The positive terminal (i.e., YNin) of each winding YN is connected to a corresponding electrical phase terminal (e.g., the electrical phase terminals of the U, V, and W phases). In other words, each winding has YN terminals connected to the electrical phase terminals.

[0081] Please refer to Figure 2, which shows a side view of a motor stator 100 according to an embodiment of the present invention. The circuit 50 disclosed herein is intended to be implemented using an iron core 110 and a plurality of hairpin conductors 120. Specifically, the legs (120b, 120c) of the plurality of hairpin conductors 120 are inserted into corresponding (phase) slots from the insertion side 110a of the iron core 110, and pass through the extension side 110b of the iron core 110 and are appropriately bent. When the hairpin conductors 120 are installed in the iron core 110, their bends 120a are located on the insertion side 110a of the iron core 110, while their legs (120b, 120c) are located on the extension side. Once all hairpin conductors 120 belonging to the same winding are inserted into corresponding (phase) slots, the corresponding legs (120b, 120c) can be connected, thereby connecting all hairpin conductors 120 of the same winding to each other. In some embodiments of the present invention, the negative and positive terminals of the windings connected by the plurality of hairpin conductors 120 extend from the insertion side 110a of the core 110 and are connected to the electrically neutral terminal and the electrical phase terminal, respectively. In some embodiments of the present invention, the negative and positive terminals of the windings connected by the plurality of hairpin conductors 120 may protrude from the insertion side 110a or the extension side protrusion 110b of the core 110 and be connected to the electrically neutral terminal and the electrical phase terminal, respectively. In some embodiments of the present invention, the leg ends (e.g., 120b and 120c) of all hairpin conductors protruding from the extension side 110b are connected to the leg ends of the adjacent slot layer to form a span of one pole pitch.

[0082] Please refer to Figure 3, which shows a top view of a 72-slot motor stator core according to an embodiment of the present invention. This top view of the core is a top view of the core's insertion side. This core 110 is used to implement a motor stator having 8 poles, 72 (phase) slots (A, B, C), and 6 layers of wire. Each (phase) slot (A, B, C) includes radially adjacent slot positions (i.e., "boxes" in the figure), each slot accommodating a hairpin conductor. All slots are located circumferentially around the rotor accommodation space 150 and form a plurality of radially adjacent slot layers (L1-L6). The 8 poles divide the core 110 equally in the circumferential direction, and each pole has U, V, and W phases. For example, the first pole has U1, V1, and W1 phases, the second pole has U2, V2, and W3 phases, and the eighth pole has U8, V8, and W8 phases. Each phase has a plurality of Q (phase) slots, such as the circumferentially adjacent phase slots A (left), B (center), and C (right) in the figure, with Q = 3. The 72 slots in this embodiment are equivalent to: 8 (pole regions) x 3 (phases / pole region) x 3 (slots / phase). The 72 (phase) slots and their associated slot positions circumferentially surround the rotor accommodating space 150, with each (phase) slot radially away from the rotor accommodating space 150. Each (phase) slot accommodates six layers of hairpin-shaped conductors, with layers L1 through L6 from the outside inward. The annular core 110 defines a rotor accommodating space 150 for accommodating the rotor. Layer L6 is closest to the rotor accommodating space 150, while layer L1 is farthest from the rotor accommodating space 150. In this embodiment of the present invention, the (phase) slots in the pole regions have the same or substantially the same cross-sectional dimensions, and the spacing between the (phase) slots is also the same or substantially the same, but this is not limiting.

[0083] Please refer to Figure 4 , which shows a schematic diagram of one winding of the U phase of a 72-slot motor stator according to an embodiment of the present invention. The above-mentioned iron core 110 is used to implement a motor stator with 8 poles, 72 (phase) slots, and 6 layers of wires, and the U, V, and W phases each have 8 parallel windings, and the number of parallel windings is equal to the total number of poles. Taking the U phase as an example, the wire of winding Y1 (for example Figure 2Wire 122 is inserted from the core insertion side into the L1 layer of phase slot A of phase U1. It is then connected to the L2 layer of phase slot A of phase U2 on the core extension side. It is then connected to the L1 layer of phase slot B of phase U3 on the core insertion side. It is then connected to the L2 layer of phase slot B of phase U4 on the core extension side. It is then connected to the L1 layer of phase slot C of phase U5 on the core insertion side. It is then connected to the L2 layer of phase slot C of phase U6 on the core extension side. At this point, the wire of winding Y1 has already been wound once through each of phase slots A, B, and C in the L1 layer and once through each of phase slots A, B, and C in the L2 layer. Next, a layer-changing connecting conductor T1 is connected from the L2 layer of phase slot C of phase U6 on the core insertion side to the L3 layer of phase slot A of phase U7 on the core extension side. It is then connected to the L4 layer of phase slot A of phase U8 on the core extension side. It is then connected to the L3 layer of phase slot B of phase U1 on the core insertion side. It is then connected to the L4 layer of phase slot B of phase U2 on the core extension side. It is then connected to the L3 layer of phase slot C of phase U3 on the core insertion side. It is then connected to the L4 layer of phase slot C of phase U4 on the core extension side. Following layer-changing connecting conductor T1, the conductor of winding Y1 has already wound once through each of phase slots A, B, and C on the L3 layer, and once through each of phase slots A, B, and C on the L4 layer. Then, the layer-changing connecting conductor T2 is connected from the L4 layer of phase slot C of the U4 phase to the L5 layer of phase slot A of the U5 phase on the core insertion side, then to the L6 layer of phase slot A of the U6 phase on the core extension side, then to the L5 layer of phase slot B of the U7 phase on the core insertion side, then to the L6 layer of phase slot B of the U8 phase on the core extension side, then to the L5 layer of phase slot C of the U1 phase on the core insertion side, and then to the L6 layer of phase slot C of the U2 phase on the core extension side. After the layer-changing connecting conductor T2, the conductor of winding Y1 has been wound through each of phase slots A, B, and C of the L5 layer once, and has also been wound through each of phase slots A, B, and C of the L6 layer once, and exits at this point (the L6 layer of phase slot C of the U2 phase) (for example, Figure 2 The winding Y1 includes a plurality of cross-pole hairpin-shaped wires (e.g. Figure 2 The hairpin conductors 120 have a common span or the same span, and only different types of conductors (such as Figure 2 The legs of the cross-pole hairpin conductors (e.g. Figure 2 The legs 120b, 120c of the hairpin conductor 120 are on the side where the core extends (e.g. Figure 2The extended side 110b of the winding Y1 is connected to each other to form a winding. As can be seen above, the conductor of winding Y1 is first wound clockwise through phase slots A, B, and C once in layers L1-L2. It is then wound clockwise through phase slots A, B, and C once in layers L3-L4. Finally, it is wound clockwise through phase slots A, B, and C once in layers L5-L6. Furthermore, the winding principles for the conductor of winding Y1 are the same across layers L1-L2, L3-L4, and L5-L6. In an embodiment of the present invention, the winding Y1 is in two adjacent slot layers (e.g., L1-L2 layer, L3-L4 layer, or L3-L4 layer). On the extension side, the winding Y1 is wound through the same phase slot (A, B, or C) of the same phase (e.g., U1-U8) across the pole region, but in different slot layers. On the insertion side, the winding Y1 is wound through the adjacent phase slots (e.g., phase slot A to phase slot B or slot B to phase slot C) of the same phase across the pole region, but in different slot layers. In an embodiment of the present invention, each cross-pole hairpin conductor (e.g., Figure 2 The two pins of the hairpin conductor 120 (eg Figure 2 The legs 120b and 120c of the hairpin conductor 120 are inserted into slots of adjacent phase slots (e.g., phase slot A to phase slot B or slot B to phase slot C) of the same phase (e.g., U1-U8) in two adjacent slot layers (e.g., L1-L2, L3-L4, or L3-L4). For example, the first and second legs of each cross-pole hairpin conductor span two adjacent slot layers and are inserted into the first and second phase slots of the same phase (e.g., U1-U8), respectively. The second phase slot is adjacent to the third phase slot, which is one pole pitch away from the first phase slot. This winding arrangement connects phase slot A to phase slot B, and then from phase slot B to phase slot C, on the core insertion side, for the adjacent Un phase (n=1-8). Layers are changed between phase slots (e.g., L2 to L1, L4 to L3, or L6 to L5). When winding on the extended side of the core, the same phase slot of the same phase is maintained when crossing the poles, and only crosses two adjacent slot layers, such as connecting from layer L1 to layer L2, from layer L3 to layer L4, or from layer L5 to layer L6. In an embodiment of the present invention, when the input end of winding Y1 is inserted into the leftmost phase slot (e.g., phase slot A) of the same phase (e.g., U1-U8) of the poles, the output end of winding Y1 is inserted into the rightmost phase slot (e.g., phase slot C) of the same phase of the poles. In other words, on the extended side, winding Y1 winds through the same phase of all the poles with a span of one pole pitch, and on the inserted side, it winds through the first phase slot and the second phase slot of the same phase of all the poles, where the second phase slot is adjacent to the third phase slot that is one pole pitch away from the first phase slot.

[0084] The winding principles for the L1-L2, L3-L4, and L5-L6 layers are identical. In addition to the dimensions of the layer-changing connecting wires, the hairpin wires used in the L1-L2, L3-L4, and L5-L6 layers share the same slot spacing on the insertion side. Therefore, a single-sized hairpin wire can be used for connection. Specifically, the pole pitch, or full winding pitch, for the L1-L2, L3-L4, and L5-L6 layers is 72 slots / 8 poles, or 9 slots. The common pitch of the cross-pole hairpin wires on the insertion side is 10(9+1) slots. In other words, when the incoming end of winding Y1 is inserted into the leftmost slot (e.g., phase slot A) of the same phase (e.g., U1-U8), the common span (e.g., 10) is equal to the quotient (e.g., 9) obtained by dividing the total number of slots (e.g., 72) by the total number of pole sections (e.g., 8) plus 1. In addition to the cross-pole hairpin conductors, the span of the layer-switching connecting conductors T1 and T2 on the insertion side is 7 slots. The span of the layer-switching connecting conductors can be calculated by subtracting the number of phase slots per phase (Q=3) from the common span of 10 slots. In an embodiment of the present invention, the layer-switching connecting conductors T1 and T2 span two adjacent slot layers, with their ends positioned in the leftmost slot of one of the phases and the rightmost phase of the same phase that crosses the pole section. In an embodiment of the present invention, the winding Y1 includes a plurality of (sub-)windings connected to each other by layer-changing connecting wires T1 and T2, and one end of one of the (sub-)windings is arranged at the slot layer (for example, L6) radially closest to the rotor accommodating space or the slot layer (for example, L1) radially farthest from the rotor accommodating space for connecting to an electrical phase end or an electrical neutral end.

[0085] Please refer to Figure 5 , which shows a schematic diagram of two windings of the U-phase of the motor stator according to an embodiment of the present invention. Figure 4 The conductors of winding Y1 and winding Y2 follow the same winding rule. After entering from the core insertion side at L1 layer of phase slot A of phase U2, they are first wound alternately through phase slots A, B, and C once each in a clockwise direction at L1~L2 layers. After changing layers and connecting the conductors, they are then wound alternately through phase slots A, B, and C once each in a clockwise direction at L3~L4 layers. After changing layers and connecting the conductors, they are then wound alternately through phase slots A, B, and C once each in a clockwise direction at L5~L6 layers. Finally, the conductors exit from L6 layer of phase slot C of phase U3.

[0086] Please refer to Figure 6 , which shows a schematic diagram of the input and output connections of the 8 windings of the U-phase winding of the 72-slot motor stator according to an embodiment of the present invention. Figure 5Windings Y1 and Y2, and windings Y3 through Y8, follow the same winding principles described for windings Y1 and Y2 above, occupying all U-phase slots. Therefore, winding Y3 is wired from the L1 layer of phase slot A of phase U3, from the core insertion side, and exits from the L6 layer of phase slot C of phase U4. Winding Y4 is wired from the L1 layer of phase slot A of phase U4, from the core insertion side, and exits from the L6 layer of phase slot C of phase U5. Winding Y5 is wired from the L1 layer of phase slot A of phase U5, from the core insertion side, and exits from the L6 layer of phase slot C of phase U6. Winding Y6 is wired from the L1 layer of phase slot A of phase U6, from the core insertion side, and exits from the L6 layer of phase slot C of phase U7. The winding Y7 is fed from the L1 layer of the phase slot A of the U7 phase from the iron core insertion side, and the winding is fed from the L6 layer of the phase slot C of the U8 phase. The winding Y8 is fed from the L1 layer of the phase slot A of the U8 phase from the iron core insertion side, and the winding is fed from the L6 layer of the phase slot C of the U1 phase. The conductors of the U-phase windings Y1 to Y8 occupy all the phase slots of the U1 to U8 phases. Connect the negative terminals of Y1 to Y8 (i.e., YN - out) is connected to the electrical neutral terminal NC, the positive terminals of Y1 to Y8 (i.e. YN + in) is connected to the electrical phase end of the U phase, that is, forming the U phase parallel windings Y1 to Y8.

[0087] Please also refer to Figure 7 、 Figure 8 , respectively showing the input and output wiring diagrams of the 8 windings of the V-phase and W-phase of the 72-slot motor stator in an embodiment of the present invention. Figure 6 The U-phase winding, V-phase and W-phase 8 windings are also executed according to the same winding principle and occupy all phase slots of V1-V8 phases and W1-W8 phases, thereby forming the V-phase and W-phase parallel connected windings Y1-Y8.

[0088] Please refer to Figure 9 , which shows the input and output wiring diagram of the 8 windings of the U phase, V phase, and W phase of the 72-slot motor stator according to the embodiment of the present invention. The positive terminals (i.e., YN + ) are connected to the corresponding U-phase, V-phase, and W-phase electrical phase terminals, and the negative terminals (i.e., YN - ) are connected to the electrically neutral terminal NC.

[0089] above Figure 9 The 8 windings of U phase, V phase and W phase are all Figure 4 The windings are wound in the same regular pattern, so the pitch of the layer-changing connecting wires on the insertion side is 7 slots, while the common pitch of the cross-pole hairpin wires on the insertion side is 10 slots.

[0090] Please refer to Figure 10, which shows a schematic diagram of one winding of a 72-slot motor stator U-phase using same-layer joining wires in an embodiment of the present invention. Continuing with the U-phase windings Y1 and Y2 of Figures 4 and 5 , U-phase winding Y1 of this embodiment uses same-layer joining wire IJW1 to connect the outgoing wires of U-phase windings Y1 and Y2 of Figures 4 and 5 , forming winding YIJ1.

[0091] Please refer to Figure 11 , which shows a schematic diagram of the in-and-out wiring of the U-phase 4 windings of the 72-slot motor stator using the same-layer connecting wires in an embodiment of the present invention. Figure 10 Same-layer connecting wires are used for Figure 6 The 8 windings of the U phase can form the 4 windings of the U phase. Specifically, use the same layer connecting wire IJW1 to connect Figure 6 The inner wire ends of the U-phase windings Y1 and Y2 are connected using the same-layer connecting wire IJW2. Figure 6 The inner wire ends of the U-phase windings Y3 and Y4 are connected using the same-layer connecting wire IJW3. Figure 6 The inner wire ends of the U-phase windings Y5 and Y6 are connected using the same-layer connecting wire IJW4. Figure 6 The inner wire ends of the U-phase windings Y7 and Y8 can form the U-phase windings YIJ1 to YIJ4 of this example. The two ends of the same-layer connecting wires (IJW1 to IJW4) are arranged in the same slot layer (i.e. L6) that is closest to the rotor accommodation space in the radial direction, and the span is one pole pitch (e.g. from phase slot C to phase slot C of the same phase across the polar region). Connect the negative ends of YIJ1 to YIJ4 (i.e. YIJN - out) is connected to the electrical neutral terminal NC, the positive terminal of YIJ1 to YIJ4 (ie YIJN + in) is connected to the U-phase electrical phase terminal, forming the U-phase parallel winding YIJ1 to YIJ4. Figure 7 、 Figure 8 The V-phase and W-phase 8 windings can also be connected by connecting the inner wire ends of the windings using the same layer of connecting wires to realize the V-phase and W-phase parallel windings YIJ1 to YIJ4. Figure 6 The windings have the same regular winding pattern, so the span of the layer-changing connecting wires on the insertion side is uniformly 7 slots, while the common pitch of the cross-pole hairpin wires on the insertion side is 10 slots. In addition, the span of the same-layer connecting wires on the insertion side is 9 slots to make up the full pitch.

[0092] Please refer to Figure 12 , which shows the wiring diagram of the 72-slot motor stator U-phase 4 winding using the external same-layer connecting wire. This embodiment also uses the same-layer connecting wire to Figure 6 The 8 windings of the U phase are replaced by the 4 windings of the U phase. Figure 10The same layer connecting wire configuration of the embodiment is used to connect the outer wire end of the winding. Specifically, the same layer connecting wire OJW1 is used to connect Figure 6 The outer ends of the U-phase windings Y1 and Y2 are connected using the same-layer connecting wire OJW2. Figure 6 The outer ends of the U-phase windings Y3 and Y4 are connected using the same-layer connecting wire OJW3. Figure 6 The outer wire ends of the U-phase windings Y5 and Y6 are connected using the same-layer connecting wire OJW4. Figure 6 The outer wire ends of the U-phase windings Y7 and Y8 can constitute the U-phase windings YOJ1 to YOJ4 of this example. The two ends of the same-layer connecting wires (OJW1 to OJW4) are arranged in the same slot layer (i.e. L1) that is farthest from the rotor accommodation space in the radial direction, and the span is one pole pitch (for example, from phase slot A to phase slot A of the same phase in the cross-pole region). Connect the negative terminals of YOJ1 to YOJ4 (i.e. YOJN - out) is connected to the electrical neutral terminal NC, the positive terminal of YOJ1~YOJ4 (ie YOJN + in) is connected to the U-phase electrical phase end, forming the U-phase parallel winding YOJ1~YOJ4. Figure 7 、 Figure 8 The V-phase and W-phase 8 windings can also be connected by using the same-layer connecting wires to connect the outer line ends of the windings to realize the V-phase and W-phase parallel windings YOJ1~YOJ4.

[0093] Please refer to Figure 13 , which shows a schematic diagram of the in-and-out wiring of the motor stator U-phase 2 winding using inner and outer same-layer connecting wires in an embodiment of the present invention. Figure 11 The U-phase YOJ1~YOJ4 windings are connected by the same layer connecting wire IJW1 in this embodiment. Figure 11 The inner wire ends of the U-phase windings YOJ1 and YOJ2 are connected using the same-layer connecting wire IJW2. Figure 11 The inner wire ends of the U-phase windings YOJ3 and YOJ4 constitute the U-phase windings YOIJ1 and YOIJ2 of this example. - out) is connected to the electrical neutral terminal NC, the positive terminal of YOIJ1 and YOIJ2 (ie YOIJN + in) is connected to the electrical phase end of the U phase, that is, the U-phase parallel-connected windings YOIJ1 and YOIJ2 are formed.

[0094] Please refer to Figure 14 , shows a schematic diagram of one winding of the U phase of the 72-slot motor stator according to an embodiment of the present invention. The winding method of this embodiment is similar to Figure 4The winding method for the U phase is slightly different. Specifically, the wire of winding Y1 enters the L2 layer of phase slot A of phase U1 from the core insertion side. It then connects to the L1 layer of phase slot A of phase U2 on the core extension side. It then connects to the L2 layer of phase slot B of phase U3 on the core insertion side. It then connects to the L1 layer of phase slot B of phase U4 on the core extension side. It then connects to the L2 layer of phase slot C of phase U5 on the core insertion side. It then connects to the L1 layer of phase slot C of phase U6 on the core extension side. At this point, the wire of winding Y1 has already wound once through each of phase slots A, B, and C in the L1 layer and once through each of phase slots A, B, and C in the L2 layer. Next, a layer-changing connecting conductor T1 connects from the L1 layer of phase slot C of phase U6 on the core insertion side to the L4 layer of phase slot A of phase U7 on the core extension side, then to the L3 layer of phase slot A of phase U8 on the core extension side, then to the L4 layer of phase slot B of phase U1 on the core insertion side, then to the L3 layer of phase slot B of phase U2 on the core extension side, then to the L4 layer of phase slot C of phase U3 on the core insertion side, and finally to the L3 layer of phase slot C of phase U4 on the core extension side. Following layer-changing connecting conductor T1, the conductor of winding Y1 has already wound once through each of phase slots A, B, and C on the L3 layer, and once through each of phase slots A, B, and C on the L4 layer. Then, the layer-changing connecting wire T2 is connected from the L3 layer of the phase slot C of the U4 phase to the L6 layer of the phase slot A of the U5 phase on the iron core insertion side, and then to the L5 layer of the phase slot A of the U6 phase on the iron core extension side, and then to the L6 layer of the phase slot B of the U7 phase on the iron core insertion side, and then to the L5 layer of the phase slot B of the U8 phase on the iron core extension side, and then to the L6 layer of the phase slot C of the U1 phase on the iron core insertion side, and then to the L5 layer of the phase slot C of the U2 phase on the iron core extension side. After the layer-changing connecting wire T2, the wire of the winding Y1 has been connected to the phase slots A, B, and C of the L5 layer once each, and has also been wound around the phase slots A, B, and C of the L6 layer once each, and exits at this point (the L5 layer of the phase slot C of the U2 phase). As in the embodiments of Figures 4 to 13 above, the same winding rules can be applied to the remaining windings of the U, V, and W phases, and will not be repeated here. The winding method of this embodiment is the same as the aforementioned Figures 4 to 13 Although the winding method of the embodiment is slightly different, the common pitch of the cross-pole hairpin conductors on the insertion side is still 10(9+1) slots, and the pitch of the layer-changing connecting conductors T1 and T2 on the insertion side is also 7 slots.

[0095] Please refer to Figure 15 , shows a schematic diagram of one winding of the U phase of the 72-slot motor stator according to an embodiment of the present invention. The winding method of this embodiment is similar to Figure 4The winding method for the U phase is slightly different. Specifically, the conductor of winding Y1 enters the L1 layer of phase slot A of phase U1 from the core insertion side, then connects to the L2 layer of phase slot A of phase U2 on the core extension side. It then connects to the L1 layer of phase slot B of phase U3 on the core insertion side, then to the L2 layer of phase slot B of phase U4 on the core extension side, then to the L1 layer of phase slot C of phase U5 on the core insertion side, and finally to the L2 layer of phase slot C of phase U6 on the core extension side. At this point, the conductor of winding Y1 has already wound once through each of phase slots A, B, and C in the L1 layer, and once through each of phase slots A, B, and C in the L2 layer. Next, a layer-changing connecting conductor T1 is connected from the L2 layer of phase slot C of phase U6 on the core insertion side to the L4 layer of phase slot A of phase U7 on the core extension side. It is then connected to the L3 layer of phase slot A of phase U8 on the core extension side. It is then connected to the L4 layer of phase slot B of phase U1 on the core insertion side. It is then connected to the L3 layer of phase slot B of phase U2 on the core extension side. It is then connected to the L4 layer of phase slot C of phase U3 on the core insertion side. It is then connected to the L3 layer of phase slot C of phase U4 on the core extension side. Following layer-changing connecting conductor T1, the conductor of winding Y1 has already wound once through each of phase slots A, B, and C on the L3 layer, and once through each of phase slots A, B, and C on the L4 layer. Then, the layer-changing connecting conductor T2 is connected from the L3 layer of the phase slot C of the U4 phase to the L5 layer of the phase slot A of the U5 phase on the core insertion side, and then to the L6 layer of the phase slot A of the U6 phase on the core extension side, and then to the L5 layer of the phase slot B of the U7 phase on the core insertion side, and then to the L6 layer of the phase slot B of the U8 phase on the core extension side, and then to the L5 layer of the phase slot C of the U1 phase on the core insertion side, and then to the L6 layer of the phase slot C of the U2 phase on the core extension side. After the layer-changing connecting conductor T2, the conductor of the winding Y1 has been wound through the phase slots A, B, and C of the L5 layer once each, and has also been wound through the phase slots A, B, and C of the L6 layer once each, and exits at this point (the L6 layer of the phase slot C of the U2 phase). The winding method of this embodiment is the same as that of the winding Y1. Figure 4 The main difference between the winding method of the U phase and the winding principle of the L3-L4 layer is that the winding principle of the L3-L4 layer is different. As in the embodiments of Figures 4-13 above, the same winding principle of this embodiment can be applied to the remaining windings of the U, V, and W phases, and will not be repeated here. Figure 4 Although the winding method of the U phase is slightly different, the common pitch of the cross-pole hairpin conductor on the insertion side is still 10 (9 + 1) slots, and the span of the layer-changing connecting conductors T1 and T2 on the insertion side is also 7 slots.

[0096] Please refer to Figure 16 , shows a schematic diagram of one winding of the U phase of the 72-slot motor stator according to an embodiment of the present invention. The winding method of this embodiment is similar to Figure 4The winding method for the U phase is slightly different. Specifically, the conductor of winding Y1 enters the L1 layer of phase slot C of phase U1 from the core insertion side, then connects to the L2 layer of phase slot C of phase U2 on the core extension side. It then connects to the L1 layer of phase slot B of phase U3 on the core insertion side, then to the L2 layer of phase slot B of phase U4 on the core extension side, then to the L1 layer of phase slot A of phase U5 on the core insertion side, and finally to the L2 layer of phase slot A of phase U6 on the core extension side. At this point, the conductor of winding Y1 has already wound once through each of phase slots A, B, and C of phase L1, and once through each of phase slots A, B, and C of phase L2. Unlike the previous embodiment, the order of the phase slots is C, then B, then A. Next, a layer-swap connecting conductor T1 connects from the L2 layer of phase slot A of phase U6 on the core insertion side to the L3 layer of phase slot C of phase U7 on the core extension side, then to the L4 layer of phase slot C of phase U8 on the core extension side. Next, it connects to the L3 layer of phase slot B of phase U1 on the core insertion side, then to the L4 layer of phase slot B of phase U2 on the core extension side, then to the L3 layer of phase slot A of phase U3 on the core insertion side, and finally to the L4 layer of phase slot A of phase U4 on the core extension side. Following layer-swap connecting conductor T1, the conductor of winding Y1 has already wound through phase slots A, B, and C of the L3 layer once each, and through phase slots A, B, and C of the L4 layer once each, in the order of C to B and then to A. Next, a layer-swap connecting conductor T2 connects from the L4 layer of phase slot A of phase U4 on the core insertion side to the L5 layer of phase slot C of phase U5 on the core extension side. It then connects to the L6 layer of phase slot C of phase U6 on the core extension side. It then connects to the L5 layer of phase slot B of phase U7 on the core insertion side. It then connects to the L6 layer of phase slot B of phase U8 on the core extension side. It then connects to the L5 layer of phase slot A of phase U1 on the core insertion side. Finally, it connects to the L6 layer of phase slot A of phase U2 on the core extension side. Following layer-swap connecting conductor T2, the conductor of winding Y1 has already wound through phase slots A, B, and C of the L5 layer once each, and through phase slots A, B, and C of the L6 layer once each, in the order of C to B and then to A, before exiting at this point. In an embodiment of the present invention, the incoming end of winding Y1 is inserted into the rightmost phase slot (e.g., phase slot C) of the same phase (e.g., U1-U8) of the pole sections, and the outgoing end of winding Y1 is inserted into the leftmost phase slot (e.g., phase slot A) of the same phase (e.g., U1-U8) of the pole sections. As with the previous embodiment, the same winding rules of this embodiment can be applied to the remaining windings of the U, V, and W phases and will not be further described. The pole pitch or full winding pitch of this embodiment is calculated as 72 slots / 8 pole sections, which is 9 slots. The common pitch of the cross-pole hairpin conductor on the insertion side is 8 (9-1) slots. In other words, when the incoming end of winding Y1 is inserted into the rightmost phase slot (e.g., phase slot C) of the same phase (e.g., U1-U8), the common pitch (e.g., 8) is equal to the quotient (e.g., 9) obtained by dividing the total number of slots (e.g., 72) by the total number of pole sections (e.g., 8) minus 1.In addition to the cross-pole hairpin conductors, the span of the layer-changing connecting conductors T1 and T2 on the insertion side is 11 slots. The span of the layer-changing connecting conductors can be obtained by adding the number of phase slots (Q=3) of each phase to the common span of 8 slots.

[0097] Please refer to Figure 17 , shows a schematic diagram of one winding of the U phase of the 72-slot motor stator according to an embodiment of the present invention. The winding method of this embodiment is similar to Figure 4 The winding method for the U phase is slightly different. Specifically, the wire of winding Y1 enters the L1 layer of phase slot A of phase U1 from the core insertion side. It then connects to the L2 layer of phase slot A of phase U2 on the core extension side. It then connects to the L1 layer of phase slot B of phase U3 on the core insertion side. It then connects to the L2 layer of phase slot B of phase U4 on the core extension side. It then connects to the L1 layer of phase slot C of phase U5 on the core insertion side. It then connects to the L2 layer of phase slot C of phase U6 on the core extension side. At this point, the wire of winding Y1 has already wound once through each of phase slots A, B, and C in the L1 layer, and once through each of phase slots A, B, and C in the L2 layer, in the order A to B and then C. Next, a layer-swap connecting conductor T1 connects from the L2 layer of phase slot C of phase U6 on the core insertion side to the L3 layer of phase slot C of phase U7 on the core extension side, then to the L4 layer of phase slot C of phase U8 on the core extension side. Next, it connects to the L3 layer of phase slot B of phase U1 on the core insertion side, then to the L4 layer of phase slot B of phase U2 on the core extension side, then to the L3 layer of phase slot A of phase U3 on the core insertion side, and finally to the L4 layer of phase slot A of phase U4 on the core extension side. Following layer-swap connecting conductor T1, the conductor of winding Y1 has already wound through phase slots A, B, and C of the L3 layer once each, and through phase slots A, B, and C of the L4 layer once each, but in the order of C to B and then to A. Then, the layer-changing connecting conductor T2 is connected from the L4 layer of the phase slot A of the U4 phase to the L5 layer of the phase slot A of the U5 phase on the iron core insertion side, and then to the L6 layer of the phase slot A of the U6 phase on the iron core extension side, and then to the L5 layer of the phase slot B of the U7 phase on the iron core insertion side, and then to the L6 layer of the phase slot B of the U8 phase on the iron core extension side, and then to the L5 layer of the phase slot C of the U1 phase on the iron core insertion side, and then to the L6 layer of the phase slot C of the U2 phase on the iron core extension side. After the layer-changing connecting conductor T2, the conductor of the winding Y1 has been wound through the phase slots A, B, and C of the L5 layer once, and has also been wound through the phase slots A, B, and C of the L6 layer once, in the order of A to B and then to C, and the wire is output at this point. The winding method of this embodiment is the same as that of the winding Y1. Figure 4The main difference in the winding method of the U phase lies in the winding principle of the L3-L4 layer. As in the previous embodiment, the same winding rules of this embodiment can be applied to the remaining windings of the U, V, and W phases and will not be repeated here. The pole pitch or full pitch of the winding in this embodiment is calculated as 72 slots / 8 poles, which is 9 slots. The common pitch of the cross-pole hairpin conductors of the L1-L2 and L5-L6 layers on the insertion side is 10 (9+1) slots, while the common pitch of the cross-pole hairpin conductors of the L3-L4 layers on the insertion side is 8 (9-1) slots. In addition to the cross-pole hairpin conductors, the span of the layer-changing connecting conductors T1 and T2 on the insertion side is 9 slots. In an embodiment of the present invention, the layer-changing connecting conductors T1 and T2 span two adjacent slot layers, and the span between the two ends of the layer-changing connecting conductor is one pole pitch (for example, T1 is from phase slot C to phase slot C of the same phase across the polar region; T2 is from phase slot A to phase slot A of the same phase across the polar region).

[0098] Please refer to Figure 18 , which shows a schematic diagram of one winding of the U phase of the 72-slot motor stator according to an embodiment of the present invention. The winding method of this embodiment is similar to Figure 4The winding method for the U phase is slightly different. Specifically, the wire of winding Y1 enters the L1 layer of phase slot A of phase U1 from the core insertion side. It then connects to the L2 layer of phase slot A of phase U2 on the core extension side. It then connects to the L1 layer of phase slot B of phase U3 on the core insertion side. It then connects to the L2 layer of phase slot B of phase U4 on the core extension side. It then connects to the L1 layer of phase slot C of phase U5 on the core insertion side. It then connects to the L2 layer of phase slot C of phase U6 on the core extension side. At this point, the wire of winding Y1 has already wound once through each of phase slots A, B, and C of phase L1. It has also wound once through each of phase slots A, B, and C of phase L2, in the order A to B and then C. Next, a layer-swap connecting conductor T1 connects from the L2 layer of phase slot C of phase U6 on the core insertion side to the L4 layer of phase slot C of phase U7 on the core extension side, then to the L3 layer of phase slot C of phase U8 on the core extension side, then to the L4 layer of phase slot B of phase U1 on the core insertion side, then to the L3 layer of phase slot B of phase U2 on the core extension side, then to the L4 layer of phase slot A of phase U3 on the core insertion side, and finally to the L3 layer of phase slot A of phase U4 on the core extension side. Following layer-swap connecting conductor T1, the conductor of winding Y1 has already wound through phase slots A, B, and C of the L3 layer once each, and through phase slots A, B, and C of the L4 layer once each, in the order C to B and then to A. Then, the layer-changing connecting conductor T2 is connected from the L3 layer of the phase slot A of the U4 phase to the L5 layer of the phase slot C of the U5 phase on the iron core insertion side, and then to the L6 layer of the phase slot C of the U6 phase on the iron core extension side, and then to the L5 layer of the phase slot B of the U7 phase on the iron core insertion side, and then to the L6 layer of the phase slot B of the U8 phase on the iron core extension side, and then to the L5 layer of the phase slot A of the U1 phase on the iron core insertion side, and then to the L6 layer of the phase slot A of the U2 phase on the iron core extension side. After the layer-changing connecting conductor T2, the conductor of the winding Y1 has been wound through the phase slots A, B, and C of the L5 layer once, and has also been wound through the phase slots A, B, and C of the L6 layer once, in the order of C to B and then to A, and the wire is output at this point. The winding method of this embodiment is the same as that of the winding Y1. Figure 4 The main difference in the winding method of the U phase lies in the winding principles of the L3~L4 layer and the L5~L6 layer. The same winding rules of this embodiment can be applied to the remaining windings of the U, V, and W phases and will not be repeated here. The pole pitch or full pitch of the winding in this embodiment is calculated as 72 slots / 8 poles, which is 9 slots. The common pitch of the cross-pole hairpin conductors of the L1~L2 layers on the insertion side is 10 (9+1) slots, while the common pitch of the cross-pole hairpin conductors of the L3~L4 layers and the L5~L6 layers on the insertion side is 8 (9-1) slots. In addition to the cross-pole hairpin conductors, the span of the layer-changing connecting conductor T1 on the insertion side is 9 slots, while the span of T2 on the insertion side is 11 slots.

[0099] above Figures 13-18When this winding method is applied to the remaining windings of the U, V, and W phases, it can also be combined with connecting wires on the same layer to change the number of parallel windings. In all embodiments, the wires exiting from the radially innermost and outermost layers have the advantage of easily connecting the endpoints of the inner / outer layer wires to the phase terminal / neutral terminal, or extending the wires to connect to other connection endpoints (e.g., configuring connecting wires on the same layer).

[0100] Please refer to Figure 19 , which shows a winding schematic diagram of the U phase of a 48-slot motor stator according to an embodiment of the present invention. Unlike the aforementioned 72-slot, 6-layer motor stator, this embodiment implements the aforementioned circuit 50 using an 8-pole, 48-slot, 2-layer motor stator. Each (phase) slot (A, B) includes radially adjacent slot positions (i.e., "boxes" in the figure), each slot accommodating a hairpin conductor. All slots are circumferentially arranged around the rotor housing and formed in radially adjacent slot layers (L1-L2). Each pole region has U, V, and W phases. For example, the first pole region has U1, V1, and W1 phases; the second pole region has U2, V2, and W3 phases; and the eighth pole region has U8, V8, and W8 phases. Each phase has multiple phase slots, such as the circumferentially adjacent phase slots A (left) and B (right) in the figure. The 48 phase slots in this embodiment are equivalent to: 8 (poles) x 3 (phases / pole) x 2 (slots / phase). Each phase slot accommodates two layers of hairpin conductors, starting with L1 and ending with L2, from the outside in. If the U, V, and W phases each have eight parallel windings (the number of parallel windings equals the total number of poles), taking the U phase as an example, the conductor of winding Y1 enters the U1 phase slot A at L1, from the core insertion side. It then connects to the U2 phase slot A at L2, on the core extension side. It then connects to the U3 phase slot B at L1, and finally to the U4 phase slot B at L2, on the core extension side. At this point, the conductor of winding Y1 has already wound once through each of phase slots A and B in the L1 layer, and once through each of phase slots A and B in the L2 layer, in the order of A first and B later, exiting at this point. The pole pitch, or full pitch, of winding Y1 is calculated as 48 slots / 8 poles, which equals 6 slots. The common pitch of the cross-pole hairpin conductor on the insertion side is 7 (6 + 1) slots.

[0101] Please refer to Figure 20 , which shows the input and output wiring diagram of the 8 windings of the U-phase of the 48-slot motor stator according to an embodiment of the present invention. Figure 18Windings Y1, Y2, and Y8 follow the same winding principles. Winding Y2 begins with the L1 layer of phase slot A of phase U2, inserted from the core insertion side, and exits from the L2 layer of phase slot B of phase U5. Winding Y3 begins with the L1 layer of phase slot A of phase U3, inserted from the core insertion side, and exits from the L2 layer of phase slot B of phase U6. Winding Y4 begins with the L1 layer of phase slot A of phase U4, inserted from the core insertion side, and exits from the L2 layer of phase slot B of phase U7. Winding Y5 begins with the L1 layer of phase slot A of phase U5, inserted from the core insertion side, and exits from the L2 layer of phase slot B of phase U8. Winding Y6 begins with the L1 layer of phase slot A of phase U6, inserted from the core insertion side, and exits from the L2 layer of phase slot B of phase U1. The winding Y7 is fed from the L1 layer of the phase slot A of the U7 phase from the iron core insertion side, and the winding is fed from the L2 layer of the phase slot B of the U2 phase. The winding Y8 is fed from the L1 layer of the phase slot A of the U8 phase from the iron core insertion side, and the winding is fed from the L2 layer of the phase slot B of the U3 phase. The conductors of the U-phase windings Y1 to Y8 occupy all the phase slots of the U1 to U8 phases. Connect the negative terminals of Y1 to Y8 (i.e., YN - out) is connected to the electrical neutral terminal NC, the positive terminals of Y1 to Y8 (i.e. YN + in) is connected to the electrical phase end of the U phase, that is, forming the U phase parallel connected windings Y1 to Y8. Figure 19 Winding Y1~Y8 and Figure 18 Winding Y1 uses the same winding method, resulting in a full pitch of 6 slots. The common pitch of the cross-pole hairpin conductors on the insertion side remains 7 (6 + 1) slots. No layer-switching conductors are used.

[0102] Please also refer to Figure 21 、 22 , which shows a schematic diagram of the input and output wiring of the 8 windings of the V-phase and W-phase of the 48-slot motor stator according to an embodiment of the present invention. Figure 20 The U-phase winding and the eight V-phase and W-phase windings follow the same winding principles, occupying all slots in phases V1 through V8 and W1 through W8, forming the parallel V- and W-phase windings Y1 through Y8. The V- and W-phase windings follow the same winding method as the V-phase winding, resulting in a full pitch of 6 slots. The common pitch of the transpolar hairpin conductors on the insertion side is 7 (6 + 1) slots. No layer-changing connecting conductors are used.

[0103] Please refer to Figure 23 , which shows a schematic diagram of the in-out wiring of the 4 windings of the U phase of the 48-slot motor stator using the same-layer connecting wires. Figure 9 Same-layer connecting wire) is used for Figure 20 The 8 windings of the U phase of the embodiment can constitute the 4 windings of the U phase of the embodiment. Specifically, the same layer connecting wire IJW1 is used to connect Figure 20 The inner wire ends of the U-phase windings Y1 and Y2 are connected using the same-layer connecting wire IJW2. Figure 19 The inner wire ends of the U-phase windings Y3 and Y4 are connected using the same-layer connecting wire IJW3. Figure 19 The inner wire ends of the U-phase windings Y5 and Y6 are connected using the same-layer connecting wire IJW4. Figure 20 The inner wire ends of the U-phase windings Y7 and Y8 can form the U-phase windings YIJ1 to YIJ4 of this example. - out) is connected to the electrical neutral terminal NC, the positive terminal of YIJ1 to YIJ4 (ie YIJN + in) is connected to the electrical phase terminal of the U phase, forming the parallel windings YIJ1 to YIJ4 of the U phase. The winding method of the parallel windings YIJ1 to YIJ4 of this embodiment can also be applied to the V phase and W phase, and will not be repeated here.

[0104] Please refer to Figure 24 , which shows a schematic diagram of one winding of the U-phase of the 48-slot motor stator according to an embodiment of the present invention. Figure 19 The winding Y1 of this embodiment will be Figure 19 The winding Y1 of U1 to U4 is wound in the same manner, and is repeated for U5 to U8. Specifically, the conductor of winding YF1 enters the L1 layer of phase slot A of phase U1 from the core insertion side, then connects to the L2 layer of phase slot A of phase U2 on the core extension side, then to the L1 layer of phase slot B of phase U3 on the core insertion side, then to the L2 layer of phase slot B of phase U4 on the core extension side, then to the L1 layer of phase slot A of phase U5 on the core insertion side via the layer-changing connecting conductor T1, then to the L2 layer of phase slot A of phase U6 on the core extension side, then to the L1 layer of phase slot B of phase U7 on the core insertion side, and finally to the L2 layer of phase slot B of phase U8 on the core extension side. At this point, the conductor of winding YF1 has been wound around the phase slots A and B of the L1 layer twice, and has also been wound around the phase slots A and B of the L2 layer twice, in the order of A first and then B, and the conductor exits at this point. Figure 24 Winding YF1 and Figure 19 Winding Y1 uses the same winding method except for the addition of a layer-switching conductor, resulting in a full pitch of 6 slots. The common pitch of the transpole hairpin conductors on the insertion side remains 7 (6 + 1) slots. In addition to the transpole hairpin conductors, the layer-switching conductor T1 has a span of 5 slots on the insertion side. The span of the layer-switching conductors is calculated by subtracting the number of slots per phase (Q = 2) from the common span of 7 slots.

[0105] Please refer to Figure 25, which shows a schematic diagram of the input and output connections of the four windings of the W phase of the 48-slot motor stator according to an embodiment of the present invention. Figure 23 The conductors of windings YF1 and YF2 follow the same winding pattern as winding YF1. After entering the L1 layer of phase slot A of phase U2 from the core insertion side, they wind clockwise through phase slots A and B of phases U2 to U5 once each in the L1 to L2 layers. After switching layers and connecting the conductors, they continue to wind clockwise through phase slots A and B of phases U6 to U1 once each in the L1 to L2 layers, finally exiting from the L2 layer of phase slot B of phase U1. Following the same winding pattern, winding YF3 enters the L1 layer of phase slot A of phase U3 from the core insertion side, exiting from the L2 layer of phase slot B of phase U2. Winding YF4 enters the L1 layer of phase slot A of phase U4 from the core insertion side, exiting from the L2 layer of phase slot B of phase U3. The conductors of U-phase windings YF1 to YF4 now occupy all the phase slots of phases U1 to U8. Connect the negative terminals of YF1 to YF4 (i.e. - out) is connected to the electrical neutral terminal NC, the positive terminals of YF1 to YF4 (i.e. YFN + in) is connected to the U-phase electrical phase end, forming the U-phase parallel windings YF1 to YF4. In other embodiments, as described above Figure 14 、 16 The winding rule changes can also be applied to the winding of the 48-slot motor stator. Figure 25 Winding YF1~YF4 and Figure 24 The winding YF1 of each winding is the same, so the full pitch is still 6 slots. The common pitch of the cross-pole hairpin conductor on the insertion side is still 7 (6 + 1) slots. The span of the layer-changing connecting conductor T1 on the insertion side is still 5 slots.

[0106] Please refer to Figure 26 , which shows a schematic diagram of the in-out wiring of the two windings of the U-phase of the 48-slot motor stator according to an embodiment of the present invention using the same-layer connecting wires. Figure 23 Same-layer connecting wire) is used for Figure 25 The four windings of the U phase of the embodiment can constitute the two windings of the U phase of the embodiment. Specifically, the same layer connecting wire IJW1 is used to connect Figure 25 The inner wire ends of the U-phase windings YF1 and YF2 are connected using the same-layer connecting wire IJW2. Figure 25 The inner wire ends of the U-phase windings YF3 and YF4 can form the U-phase windings YIJ1 and YIJ2 of this example. - out) is connected to the electrical neutral end, the positive end of YIJ1 and YIJ2 (i.e. YIJN +in) is connected to the electrical phase end of the U phase, forming the parallel windings YIJ1 and YIJ2 of the U phase. The winding method of the parallel windings YIJ1 and YIJ2 of this embodiment can also be applied to the V phase and W phase, and will not be repeated here.

[0107] The stator with 72 or 48 slots is used as an example of the hairpin conductor of the present invention, but the specific number of slots is not limited. Each U-phase, V-phase, and W-phase has 2 or 3 phase slots, and more than 2 phase slots can meet the requirements of the above winding method.

[0108] The hairpin stator of the present invention utilizes the aforementioned winding method, allowing a single winding to wind around each slot an equal number of times in multiple phase slots (e.g., A, B or A, B, C) of adjacent slot layers (e.g., L1-2) within the corresponding U, V, and W phases. This ensures that all windings are evenly distributed across each slot, thus preventing the generation of circulating currents. Furthermore, at least one of the aforementioned winding methods allows the maximum number of windings connected in parallel per phase to equal the number of poles. At least one of the aforementioned embodiments can reduce the number of hairpin wires, requiring only a common-pitch hairpin wire and a transition wire.

[0109] Although the present invention has been disclosed in the form of embodiments as described above, they are not intended to limit the present invention. Any person skilled in the art may make various changes and modifications without departing from the concept and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A hairpin-shaped wire motor stator, comprising: An iron core having a ring shape and defining a rotor accommodation space at the center of the iron core, wherein the iron core includes an insertion side and an extension side for the hairpin conductor to be inserted through the insertion side and pass through the extension side; A plurality of slots are located on the core, the slots being located circumferentially around the rotor accommodation space and forming a plurality of radially adjacent slot layers. The core includes a plurality of pole regions, each of the pole regions includes a plurality of phases, each of the phases includes a plurality of phase slots, the phase slots are circumferentially adjacent and include at least a leftmost phase slot and a rightmost phase slot, and each phase slot includes the radially adjacent slots. The plurality of hairpin conductors are configured to be placed in the slots of the phase slots of the same phase of the pole regions, and the hairpin conductors are connected to form a plurality of windings. in, The hairpin conductors include a plurality of transpolar hairpin conductors, the transpolar hairpin conductors being wound around two adjacent slot layers, and all the transpolar hairpin conductors being wound around two adjacent slot layers in the same radial direction having the same span on the insertion side, which is equal to a quotient obtained by dividing the total number of the phase slots by the total number of the pole regions plus 1 or minus 1; At least one layer-changing connecting wire is connected to two of the windings wound around two slot layers that are adjacent in different radial directions. Each winding includes all of the cross-pole hairpin wires wound around two slot layers that are adjacent in the same radial direction, and the two ends of each winding are arranged at the leftmost phase slot of the phase slots of the same phase and the rightmost phase slot of the cross-pole region, wherein the two ends of the layer-changing connecting wire are arranged at the leftmost phase slot of the phase slots of the same phase and the rightmost phase slot of the cross-pole region.

2. The hairpin lead motor stator of claim 1 , wherein each of the cross-pole hairpin leads comprises a first leg and a second leg, the first leg and the second leg spanning two adjacent slot layers and respectively inserted into a first phase slot and a second phase slot of the same phase in the cross-pole region, wherein the second phase slot is adjacent to a third phase slot that is one pole pitch away from the first phase slot. 3 . The hairpin wire motor stator as claimed in claim 1 , wherein one end of one of the windings protrudes from the insertion side or the extension side for connecting to an electrical phase terminal or an electrical neutral terminal.

4. The hairpin wire motor stator according to claim 1, wherein: The span between the two ends of the layer-changing connecting wire is one pole pitch.

5. The hairpin wire motor stator according to claim 1 further comprises at least one same-layer connecting wire connected to two of the windings, wherein both ends of the same-layer connecting wire are arranged in the same slot layer and have a span equal to one pole pitch. 6 . The hairpin-shaped wire motor stator according to claim 5 , wherein both ends of the connecting wires in the same layer are arranged in the same slot layer radially closest to the rotor accommodating space or the same slot layer radially farthest from the rotor accommodating space. 7 . The hairpin wire motor stator according to claim 1 , wherein the leg ends of all the hairpin wires protruding from the extension side are connected to the leg ends of adjacent slot layers to form a span of a pole pitch.

8. A hairpin-shaped wire motor stator, comprising: An iron core having a ring shape and defining a rotor accommodation space at the center of the iron core, wherein the iron core includes an insertion side and an extension side for the hairpin conductor to be inserted through the insertion side and pass through the extension side; a plurality of slots located on the core, the slots being circumferentially disposed around the rotor accommodation space and forming a plurality of radially adjacent slot layers, the core comprising a plurality of pole regions, each of the pole regions comprising a plurality of phases, each of the phases comprising a plurality of phase slots, the phase slots being circumferentially adjacent, and each phase slot comprising the radially adjacent slots; and The plurality of hairpin conductors are configured to be placed in the slots of the phase slots of the same phase of the pole sections. The hairpin conductors are connected to form a plurality of windings. Each winding is wound through two adjacent slot layers on the insertion side and the extension side and has the following winding structure: On the extended side, a span of one pole pitch passes through the same phase of all the pole regions; and On the insertion side, a first phase slot and a second phase slot of the same phase passing through all the pole regions, wherein the second phase slot is adjacent to a third phase slot that is one pole pitch away from the first phase slot. in, The hairpin conductors include a plurality of transpolar hairpin conductors, and all of the transpolar hairpin conductors wound around two adjacent slot layers in the same radial direction have the same span on the insertion side; and At least one layer-changing connecting wire is connected to two of the windings wound around two slot layers that are adjacent in different radial directions. Each winding includes all of the cross-pole hairpin wires wound around two slot layers that are adjacent in the same radial direction, and the two ends of each winding are arranged at the leftmost phase slot of the phase slots of the same phase and the rightmost phase slot of the cross-pole region, wherein the two ends of the layer-changing connecting wire are arranged at the leftmost phase slot of the phase slots of the same phase and the rightmost phase slot of the cross-pole region.

9. The hairpin wire motor stator as claimed in claim 8, wherein one end of one of the windings is disposed in a slot layer radially closest to the rotor accommodating space or a slot layer radially farthest from the rotor accommodating space for connecting to an electrical phase end or an electrical neutral end.

10. The hairpin motor stator according to claim 8, wherein a span of the cross-pole hairpin wires on the insertion side is equal to a quotient obtained by dividing the total number of the phase slots by the total number of the pole regions plus 1 or minus 1.

11. The hairpin wire motor stator according to claim 8, further comprising at least one same-layer connecting wire connected to two of the windings, wherein both ends of the same-layer connecting wire are disposed in the same slot layer and have a span equal to one pole pitch.

12. The hairpin wire motor stator according to claim 8, wherein the hairpin wires extend from the insertion side: The YN number terminals are used to connect the electrical phase terminals; and The YN number of terminals are used to connect to the electrically neutral terminal, where YN is equal to the total number of poles.

13. A hairpin wire motor stator, comprising: A toroidal core includes a first side and an opposite second side in the axial direction, wherein: The first side is an insertion side of the core; a plurality of slots located on the core for arranging a plurality of hairpin conductors, the slots forming adjacent slots in a circumferential direction around the core and forming a plurality of radially adjacent slot layers, the core comprising a plurality of pole sections, each pole section comprising a group of the slots, each pole section comprising a plurality of phases, each phase comprising a plurality of phase slots, the phase slots being circumferentially adjacent and having at least a leftmost phase slot and a rightmost phase slot; and A plurality of stator windings, each of the stator windings being formed by connecting the hairpin conductors arranged across the pole regions, wherein all the connected hairpin conductors radially span two adjacent slot layers, and the span on the first side in the circumferential direction is: One pole pitch plus one adjacent slot; or One pole pitch minus one adjacent slot; or The combination of one pole pitch plus one adjacent slot and one pole pitch minus one adjacent slot, The hairpin conductors include a plurality of transpolar hairpin conductors, and all of the transpolar hairpin conductors wound around two adjacent slot layers in the same radial direction have the same span on the insertion side; and At least one layer-changing connecting wire is connected to two of the windings wound around two slot layers that are adjacent in different radial directions. Each winding includes all of the cross-pole hairpin wires wound around two slot layers that are adjacent in the same radial direction, and the two ends of each winding are arranged at the leftmost phase slot of the phase slots of the same phase and the rightmost phase slot of the cross-pole region, wherein the two ends of the layer-changing connecting wire are arranged at the leftmost phase slot of the phase slots of the same phase and the rightmost phase slot of the cross-pole region. 14 . The hairpin wire motor stator according to claim 13 , wherein one end of one of the hairpin wires is disposed in the radially outermost slot layer or the radially innermost slot layer for connecting to an electrical phase terminal or an electrical neutral terminal.

15. The hairpin wire motor stator of claim 13, further comprising at least one same-layer connecting wire connected to two of the stator windings, wherein both ends of the same-layer connecting wire are disposed in the same slot layer across the pole region, and the span between the two ends of the same-layer connecting wire is one pole pitch.

Images