Winding structure of motor stator

Abstract

A winding structure of a motor stator comprises an iron core, a plurality of slots and a plurality of hairpin-shaped leads. The plurality of slots are located on the iron core and allow the plurality of hairpin-shaped wires to be placed in from the insertion side and to penetrate out from the extension side. The grooves surround the rotor accommodating space in the circumferential direction. The first-phase winding is configured from a first-phase wire inlet slot position and comprises a plurality of first-phase return connecting wires. The second phase winding is configured from the wire inlet slot position of the second phase and comprises a plurality of second phase return connecting wires. The third-phase winding is configured from the wire inlet slot position of the third phase and comprises a plurality of third-phase return connecting wires. And the wire inlet slot position of the first phase, the wire inlet slot position of the second phase and the wire inlet slot position of the third phase are respectively positioned in three different polar regions.

Description

Technical Field

[0001] The invention relates to a motor stator, and in particular to a winding structure of a motor stator with reduced axial space configuration. Background Art

[0002] Existing hairpin wire motor stators often have multiple parallel winding circuit designs, and multiple hairpin wires are often required to complete the winding structure of the entire motor stator, which increases the complexity of motor stator manufacturing. In view of this, motor manufacturers are actively seeking appropriate wire winding methods to more effectively control the types of hairpin wires required for manufacturing motor stators and production complexity, and reduce axial space configuration. Summary of the invention

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

[0004] According to one embodiment of the present invention, a winding structure of a motor stator includes a toroidal iron core, a plurality of slots, and a plurality of hairpin-shaped conductors. The iron core defines a rotor accommodation space at the center. The iron core includes an insertion side and an extension side, for the hairpin-shaped conductor to be inserted from the insertion side and pass through from the extension side. A plurality of slots are located on the iron core, and the slots are located in the circumferential direction around the rotor accommodation space and form a plurality of slot layers adjacent in the radial direction. The iron core includes a plurality of pole regions, each of the pole regions includes a plurality of phases, and each of the phases includes a plurality of phase slots. The slots of the same corresponding phase slots in the pole regions are used for connecting any one of the hairpin-shaped conductors to form a plurality of windings in parallel. The windings include at least one first phase winding, at least one second phase winding, and at least one third phase winding. The first phase winding is used to be configured starting from the first phase input slot and includes a plurality of first phase return connection lines.

[0005] The second phase winding is configured starting from the second phase incoming line slot and includes a plurality of second phase return connection lines.

[0006] The third phase winding is configured starting from the third phase incoming line slot and includes a plurality of third phase return connection lines.

[0007] The first phase line entry slot, the second phase line entry slot and the third phase line entry slot are respectively located in three different polar regions. The first phase return connecting wires, the second phase return connecting wires and the third phase return connecting wires, the parts protruding from the insertion side of the core do not overlap each other in the axial direction.

[0008] In summary, the winding structure of the motor stator of the present invention adopts the above-mentioned winding method of offsetting the wire entry slots, so that the wire entry slots of different phase windings are respectively arranged in three different and continuous pole regions, so that the parts of the return connecting wires of different phase windings protruding from the insertion side of the iron core do not overlap each other in the radial direction, thereby simplifying the design of the return connecting wires and allowing the three-phase windings to share the return connecting wires. The shapes and types of the return connecting wires can also be reduced, effectively controlling the types of wires required for manufacturing the motor stator and the production complexity, and reducing the axial space configuration.

[0009] The above description will be described in detail below with reference to implementation examples, and a further explanation will be provided for the technical solution of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the following are the descriptions of the accompanying drawings:

[0011] Figure 1 A circuit diagram showing a motor stator according to an embodiment of the present invention;

[0012] Figure 2 A side view of a motor stator showing an embodiment of the present invention;

[0013] Figure 3 A top view showing a motor stator core according to an embodiment of the present invention;

[0014] Figure 4 A schematic diagram showing two windings of a U-phase of a 48-slot motor stator according to an embodiment of the present invention;

[0015] Figure 5 A schematic diagram showing two windings of a 48-slot motor stator V phase according to an embodiment of the present invention;

[0016] Figure 6 A schematic diagram showing two windings of a 48-slot motor stator W phase according to an embodiment of the present invention;

[0017] Figure 7 A schematic diagram showing a return connection line of a motor stator winding structure according to an embodiment of the present invention;

[0018] Figure 8 Show Figure 7 A top view of the return connection line;

[0019] Fig. 9 A schematic diagram showing a return connection line of a motor stator winding structure according to another embodiment of the present invention; and

[0020] Fig.10 Show Fig. 9 A top view of the return connection line.

[0021]

Explanation of symbols

[0022] 50: Circuit

[0023] 52: Electrically neutral terminal

[0024] U:Phase

[0025] V: Phase

[0026] W: Phase

[0027] Y1, Y2, YN: Winding

[0028] Y1-out~YN-out: Negative terminal

[0029] Y1 + in~YN + in: positive end

[0030] Y1_in, Y2_in: Incoming line

[0031] Y1_out, Y2_out: outgoing line

[0032] 100: Motor stator

[0033] 110: Iron core

[0034] 110a: Insertion side

[0035] 110b: Extension side

[0036] 120: Hairpin wire

[0037] 120a: bending portion

[0038] 120b: Feet

[0039] 120c: feet

[0040] 122: Wire

[0041] 124: Wire

[0042] 150: Rotor accommodation space

[0043] P1~P8: Polar Region

[0044] L1~L6: Layer

[0045] JU1~JU8: Layer-changing connection line

[0046] JV1~JV8: Layer-changing connection line

[0047] JW1~JW8: Layer-changing connection line

[0048] RWU1, RWU2: Return connection line

[0049] RWV1, RWV2: Return connection line

[0050] RWW1, RWW2: Return connection line

[0051] RW1~RW4: Return connection line

[0052] RD: Radial

[0053] AD: Axial

[0054] TP1, TP2: Top part DETAILED DESCRIPTION

[0055] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and the various embodiments described below, in which the same numbers 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 implementation mode and the claims, unless the article is specifically limited in the text, "one" and "the" may refer to a single or multiple. The terms "incoming line" and "outgoing line" described in the specification have the same meaning (and can also be swapped). From the perspective of mechanical configuration, there is no so-called incoming line / outgoing line. From the perspective of the circuit, the positive "+" contact can be understood as the incoming line, and the negative "-" (neutral) contact can be understood as the outgoing line.

[0056] Please refer to Figure 1 , which shows a circuit diagram of a motor stator according to an embodiment of the present invention. The circuit 50 includes windings of phases U, V, and W. Each (U, V, W) phase winding includes a plurality of windings Y1 to YN connected in parallel. The negative terminal of each winding YN (i.e., YN - out) is connected to the neutral end 52 (in other words, each winding YN has N terminals connected to the neutral end), and the positive terminal of each winding YN (ie, YN + in) are connected to corresponding electrical phase terminals (such as electrical phase terminals of U, V, and W phases). In other words, each winding YN has N terminals connected to the electrical phase terminals.

[0057] 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 of the present invention is intended to be implemented with a stator 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 core 110, and pass through the extension side 110b of the core 110 and are appropriately bent. When the hairpin conductor 120 is disposed on the core 110, its bent portion 120a is located on the insertion side 110a of the core 110, and its legs (120b, 120c) are located on the extension side 110b. When all hairpin conductors 120 belonging to the same winding are inserted into the corresponding (phase) slots, the corresponding legs (120b, 120c) of the extension side 110b can be electrically connected, so that all hairpin conductors 120 of the same winding are electrically connected to each other, for example, by welding to electrically connect a plurality of corresponding legs (120b, 120c). In some embodiments of the present invention, the negative terminal and the positive terminal of the winding electrically connected by the plurality of hairpin conductors 120 can be protruded from the insertion side 110a or the extension side protrusion 110b of the core 110, and connected to the electrical neutral terminal and the electrical phase terminal respectively.

[0058] Please refer to Figure 3 , which shows a top view of a 48-slot motor stator core according to an embodiment of the present invention. The top view of the core is a top view of the insertion side of the core. The core 110 is used to realize a motor stator having 8 poles (P1-P8), 48 (phase) slots (1-48), and 6 layers of wires. Each (phase) slot includes a plurality of slots adjacent in the radial direction (i.e., "boxes" in the figure), and each slot can accommodate a hairpin-shaped conductor. All slots are located in the circumferential direction around the rotor accommodating space 150, and form a plurality of annular slot layers (L1-L6) adjacent in the radial direction. The 8 poles (P1-P8) divide the core 110 equally in the circumferential direction, and each pole has U, V, and W phases. Each phase has Q (phase) slots, for example, the number of circumferentially adjacent (phase) slots in the figure is Q=2. Each (phase) slot includes a plurality of slots in the radial direction. The 48 slots in this embodiment are equal to: 8 (pole regions) x 3 (phases / pole region) x 2 (slots / phase), and the 48 (phase) slots and the slot positions included therein surround the rotor accommodation space 150 in the circumferential direction, and each (phase) slot is arranged along the inner circumference of the iron core 110 in a direction radially away from the rotor accommodation space 150. Each (phase) slot can accommodate 6 slots of hairpin-shaped conductors, which are L1 to L6 layers from the inside to the outside of the rotor accommodation space 150 in a radial direction. The hollow annular iron core 110, viewed from above, defines a rotor accommodation space 150 at its center for accommodating the rotor. The L1 layer is closest to the rotor accommodation space 150, and the L6 layer is farthest from the rotor accommodation space 150. In the embodiment of the present invention, the (phase) slots in the pole regions have the same or nearly the same cross-sectional dimensions as each other, and the spacing between the (phase) slots is also the same or nearly the same, but not limited thereto.

[0059] Please also refer to Figure 3 , Figure 4 , Figure 4 The following is a schematic diagram of two windings of the U phase of a 48-slot motor stator according to an embodiment of the present invention. The above-mentioned iron core 110 is used to implement a motor stator winding structure having 8 poles, 48 ​​(phase) slots, and 6 layers of wires, and the U, V, and W phases each have two parallel windings. First, taking the U phase as an example, the wire of the winding Y1 (e.g. Figure 2The conductor 122) enters the line (Y1_in) from the slot (1) of the 3rd slot L6 layer of the U phase from the core extension side, and then connects to the slot (2) of the 45th slot L5 layer of the U phase on the core extension side, and then connects to the slot (3) of the 39th slot L6 layer of the U phase on the core insertion side, and then connects to the slot (4) of the 33rd slot L5 layer of the U phase on the core extension side, and then connects to the slot (5) of the 27th slot L6 layer of the U phase on the core insertion side, and then connects to the slot (6) of the 21st slot L5 layer of the U phase on the core extension side, and then connects to the slot (7) of the 15th slot L6 layer of the U phase on the core insertion side, and then connects to the slot (8) of the 9th slot L5 layer of the U phase on the core extension side. At this point, the conductor of winding Y1 has been wound through the U-phase (phase) slots of the L5 and L6 layers, and then connected to the slot (9) of the 3rd slot L4 layer of the U-phase on the core insertion side by the layer-changing connecting line JU1, and then connected to the slot (10) of the 45th slot L3 layer of the U-phase on the core extension side, and then connected to the slot (11) of the 39th slot L4 layer of the U-phase on the core insertion side, and then connected to the slot (12) of the 33rd slot L3 layer of the U-phase on the core extension side, and then connected to the slot (13) of the 27th slot L4 layer of the U-phase on the core insertion side, and then connected to the slot (14) of the 21st slot L3 layer of the U-phase on the core extension side, and then connected to the slot (15) of the 15th slot L4 layer of the U-phase on the core insertion side, and then connected to the slot (16) of the 9th slot L3 layer of the U-phase on the core extension side. At this point, the conductor of winding Y1 has been wound through the U-phase (phase) slots of the L3 to L6 layers, and then connected to the slot (16) of the U-phase 9th slot L3 layer on the iron core insertion side by the layer-changing connecting line JU2, and then connected to the slot (18) of the U-phase 45th slot L1 layer on the iron core extension side, and then connected to the slot (19) of the U-phase 39th slot L2 layer on the iron core insertion side, and then connected to the slot (20) of the U-phase 33rd slot L1 layer on the iron core extension side, and then connected to the slot (21) of the U-phase 27th slot L2 layer on the iron core insertion side, and then connected to the slot (22) of the U-phase 21st slot L1 layer on the iron core extension side, and then connected to the slot (23) of the U-phase 15th slot L2 layer on the iron core insertion side, and then connected to the slot (24) of the U-phase 9th slot L1 layer on the iron core extension side.At this point, the conductor of winding Y1 has been wound through the U-phase (phase) slots of the L1 to L6 layers, and then connected to the slot (24) of the 9th slot L1 layer of the U-phase on the iron core insertion side by the return connecting line RWU1 in the opposite circumferential direction, and then connected to the slot (26) of the 22nd slot L2 layer of the U-phase on the iron core extension side, and then connected to the slot (27) of the 28th slot L1 layer of the U-phase on the iron core insertion side, and then connected to the slot (28) of the 34th slot L2 layer of the U-phase on the iron core extension side, and then connected to the slot (29) of the 40th slot L1 layer of the U-phase on the iron core insertion side, and then connected to the slot (30) of the 46th slot L2 layer of the U-phase on the iron core extension side, and then connected to the slot (31) of the 4th slot L1 layer of the U-phase on the iron core insertion side, and then connected to the slot (32) of the 10th slot L2 layer of the U-phase on the iron core extension side. The conductor of winding Y1 has passed through the U-phase (phase) slots of the L1-L2 layers at this point after the return connection line RWU1, and is then connected from the slot position (32) of the 10th slot L2 layer of the U-phase to the slot position (33) of the 16th slot L3 layer of the U-phase on the core insertion side by the layer-changing connection line JU3, and then connected to the slot position (34) of the 22nd slot L4 layer of the U-phase on the core extension side, and then connected to the slot position (35) of the 28th slot L3 layer of the U-phase on the core insertion side, and then connected to the slot position (36) of the 34th slot L4 layer of the U-phase on the core extension side, and then connected to the slot position (37) of the 40th slot L3 layer of the U-phase on the core insertion side, and then connected to the slot position (38) of the 46th slot L4 layer of the U-phase on the core extension side, and then connected to the slot position (39) of the 4th slot L3 layer of the U-phase on the core insertion side, and then connected to the slot position (40) of the 10th slot L4 layer of the U-phase on the core extension side. The conductor of winding Y1 has passed through the U-phase (phase) slots of the L1 to L4 layers after the return connection line RWU1 at this point, and then is connected to the slot (40) of the 10th slot L4 layer of the U-phase on the iron core insertion side by the layer change connection line JU4 to the slot (41) of the 16th slot L5 layer of the U-phase, and then to the slot (42) of the 22nd slot L6 layer of the U-phase on the iron core extension side, and then to the slot (43) of the 28th slot L5 layer of the U-phase on the iron core insertion side, and then to the slot (44) of the 28th slot L5 layer of the U-phase on the iron core extension side. The core extension side is connected to the slot (44) of the 34th slot L6 layer of the U phase, and then connected to the slot (45) of the 40th slot L5 layer of the U phase on the core insertion side, and then connected to the slot (46) of the 46th slot L6 layer of the U phase on the core extension side, and then connected to the slot (47) of the 4th slot L5 layer of the U phase on the core insertion side, and then connected to the slot (48) of the 10th slot L6 layer of the U phase on the core extension side, and a line (Y1_out) is output from this slot.

[0060] The conductor of the U-phase winding Y2 is also connected in a similar manner to the winding Y1. Figure 4The winding is wound in the order of slot (1) to slot (48), that is, the line (Y2_in) is input at slot (1) of the 4th slot L6 layer of the U phase and the line (Y2_out) is output at slot (48) of the 10th slot L6 layer of the U phase, and the layer-changing connecting wires JU5 to JU8 are used for layer-changing connection. One of the differences between the U phase winding Y2 and the U phase winding Y1 is the span of the return connecting wire. The span of the return connecting wire RWU1 of the U phase winding Y1 on the iron core insertion side is 7 slots, while the span of the return connecting wire RWU2 of the U phase winding Y2 on the iron core insertion side is 5 slots. The U phase winding is connected to the electrical phase end of the U phase at the slot of the input wire (Y1_in, Y2_in), and is connected to the electrical neutral end (NeutralEnd) at the slot of the output wire (Y1_out, Y2_out).

[0061] Based on the above-mentioned L1~L2 layers, L3~L4 layers, and L5~L6 layers, the winding principles are the same. In addition to the size specifications of the layer-changing connecting wires JU1~JU8 (for example, the span is 6 slots, i.e., one pole pitch), the hairpin wires used in the L1~L2 layers, L3~L4 layers, and L5~L6 layers have the same span on the insertion side (for example, 6 slots, i.e., one pole pitch), so a hairpin wire of a single size specification can be used for connection. Specifically, the pole pitch of the above-mentioned L1~L2 layers, L3~L4 layers, and L5~L6 layers is 48 slots / 8 poles, which is equal to 6 slots. The common span of the cross-pole hairpin wires on the insertion side is also 6 slots. The span of the return connecting wire RWU1 is the pole pitch plus 1 slot, which is equal to 7 slots. The span of the return connecting wire RWU2 is the pole pitch minus 1 slot, which is equal to 5 slots. The return connection wire RWU1 and the return connection wire RWU2 are both arranged in the slot layer (eg, L1 ) closest to the rotor accommodating space 150 in the radial direction.

[0062] Please also refer to Figure 3 , Figure 5 , Figure 5 Two winding schematic diagrams of the V phase of the 48-slot motor stator according to an embodiment of the present invention are shown. The V phase also has two parallel windings Y1 and Y2. The wire of the V phase winding Y1 enters the wire (Y1_in) from the slot position (1) of the 19th slot L6 layer of the V phase on the side of the core extension, and the wire of the V phase winding Y2 enters the wire (Y1_in) from the slot position (1) of the 20th slot L6 layer of the V phase on the side of the core extension. Both are located in the pole region P3 and are located in the slot layer farthest from the rotor accommodation space 150 (refer to Figure 3 ). The line entry slots (1) of the U-phase windings (Y1, Y2) are both located in the pole region P1 (the 3rd and 4th slots). Therefore, the line entry slots (1) of the V-phase windings (Y1, Y2) and the line entry slots (1) of the U-phase windings (Y1, Y2) are located in different pole regions. The V-phase windings Y1, Y2 are similar to the U-phase windings Y1, Y2 in terms of the Figure 5The V-phase winding Y1 is wound in the order of slot (1) to slot (48). The V-phase winding Y1 enters the wire (Y1_in) from the core extension side from the slot (1) of the 19th slot L6 layer, and uses the layer-changing connecting wires JV1 to JV4 for layer-changing connection during winding, and exits the wire (Y1_out) from the core extension side from the slot (48) of the 26th slot L6 layer. The V-phase winding Y2 enters the wire (Y2_in) from the core extension side from the slot (1) of the 20th slot L6 layer, and uses the layer-changing connecting wires JV5 to JV8 for layer-changing connection during winding, and exits the wire (Y2_out) from the core extension side from the slot (48) of the 25th slot L6 layer. The span of the return connection line RWV1 on the core insertion side is 7 slots (connected from the slot (24) of the 25th slot L1 layer of the V phase to the slot (25) of the 32nd slot L1 layer of the V phase on the core insertion side), and the span of the return connection line RWV2 on the core insertion side is 5 slots (connected from the slot (24) of the 26th slot L1 layer of the V phase to the slot (25) of the 31st slot L1 layer of the V phase on the core insertion side). The V-phase winding is connected to the electrical phase end of the V phase at the slot of the incoming line (Y1_in, Y2_in), and is connected to the electrical neutral end (Neutral End) at the slot of the outgoing line (Y1_out, Y2_out). The common span of the cross-pole hairpin conductors of the V-phase winding on the insertion side is also 6 slots. The span of the return connection line RWV1 is the pole pitch plus 1 slot, which is equal to 7 slots. The span of the return connection line RWV2 is the pole pitch minus 1 slot, which is equal to 5 slots. The return connection wire RWV1 and the return connection wire RWV2 are both disposed in the slot layer (eg, L1 ) closest to the rotor accommodating space 150 in the radial direction.

[0063] Please also refer to Figure 3 , Figure 6 , Figure 6 Two winding schematic diagrams of the W phase of the 48-slot motor stator according to an embodiment of the present invention are shown. The W phase also has two parallel windings Y1 and Y2. The conductor of the W phase winding Y1 enters the wire (Y1_in) from the slot position (1) of the 11th slot L6 layer of the W phase on the extension side of the iron core, and the conductor of the W phase winding Y2 enters the wire (Y2_in) from the slot position (1) of the 12th slot L6 layer of the W phase on the extension side of the iron core. Both are located in the pole region P2 and are located in the slot layer farthest from the rotor accommodating space 150 (refer to Figure 3). The line entry slots (1) of the W-phase winding (Y1, Y2) are all located in the pole zone P2 (the 11th and 12th slots). Therefore, the line entry slots of the W-phase winding (Y1, Y2), the line entry slots of the V-phase winding (Y1, Y2) and the line entry slots of the U-phase winding (Y1, Y2) are all located in three different pole zones. In detail, the line entry slots (1) of the two windings of the U-phase are both located in the pole zone P1, the line entry slots (1) of the two windings of the V-phase are both located in the pole zone P3, and the line entry slots (1) of the two windings of the W-phase are both located in the pole zone P2. It should be noted that the line entry slots (1) of the V-phase winding are offset compared to the existing line entry slots of the V-phase winding, so that the line entry slots (1) of the U, V and W phases are respectively located in three different pole zones (P1, P3, P2). In the embodiment of the present invention, the line entry slots of the W-phase windings (Y1, Y2), the line entry slots of the V-phase windings (Y1, Y2) and the line entry slots of the U-phase windings (Y1, Y2) are respectively located in three different and continuous polar regions (P1, P2, P3). The W-phase windings Y1, Y2 are arranged in a similar manner to the U-phase windings Y1, Y2 or the V-phase windings Y1, Y2. Figure 6 The W-phase winding Y1 is wound in the order of slot (1) to slot (48). The W-phase winding Y1 enters the wire (Y1_in) from the slot (1) of the 11th slot L6 layer on the iron core extension side, and uses the layer-changing connecting wires JW1 to JW4 for layer-changing connection during winding, and exits the wire (Y1_out) from the slot (48) of the 18th slot L6 layer on the iron core extension side. The W-phase winding Y2 enters the wire (Y2_in) from the slot (1) of the 12th slot L6 layer on the iron core extension side, and uses the layer-changing connecting wires JW5 to JW8 for layer-changing connection during winding, and exits the wire (Y2_out) from the slot (48) of the 17th slot L6 layer on the iron core extension side. The span of the return connection line RWW1 on the core insertion side is 7 slots (connected from the slot (24) of the 17th slot L1 layer of the W phase to the slot (25) of the 24th slot L1 layer of the W phase on the core insertion side), and the span of the return connection line RWW2 on the core insertion side is 5 slots (connected from the slot (24) of the 18th slot L1 layer of the W phase to the slot (25) of the 23rd slot L1 layer of the W phase on the core insertion side). The W phase winding is connected to the electrical phase end of the W phase at the slot of the incoming line (Y1_in, Y2_in), and is connected to the electrical neutral end (Neutral End) at the slot of the outgoing line (Y1_out, Y2_out). The common span of the cross-pole hairpin conductors of the W phase winding on the insertion side is also 6 slots. The span of the return connection line RWW1 is the pole pitch plus 1 slot, which is equal to 7 slots. The span of the return connection line RWW2 is the pole pitch minus 1 slot, which is equal to 5 slots. The return connection wire RWW1 and the return connection wire RWW2 are both arranged in the slot layer (eg, L1 ) closest to the rotor accommodating space 150 in the radial direction.

[0064] Please also refer to Figure 7 , Figure 8 , Figure 7 A schematic diagram showing the return connection line of the motor stator winding structure according to an embodiment of the present invention is shown. Figure 8 Show Figure 7 The top view of the return connection wire. Both ends of the return connection wire RW1 and the return connection wire RW2 are arranged in the slot layer L1 closest to the rotor accommodating space 150. In the embodiment of the present invention, the return connection wire RW1 and the return connection wire RW2 respectively have the top portions (TP1, TP2) aligned in the axial direction AD, and the top portions (TP1, TP2) of the return connection wire RW1 and the return connection wire RW2 protruding from the insertion side 110a in the radial direction RD are not located in the slot layer L1, but are arranged in a non-overlapping manner in the radial direction RD and aligned with the rotor accommodating space 150. On the other hand, the insertion slot positions of the return connection wire RW1 and the return connection wire RW2 in the slot layer L1 are staggered. This design makes the multiple return connection wires RW1 and the return connection wires RW2 of the same phase winding staggered in the axial direction AD and the radial direction RD, which can reduce the turns of the wires and reduce the axial space, and reduce the assembly process. The return connecting wires RW1 and RW2 are both applicable to the above-mentioned U, V, W phase windings Y1 and Y2, so the same set of return connecting wires RW1 and RW2 can correspond to the assembly of windings Y1 and Y2 at the same time, reducing the material preparation cost.

[0065] Please also refer to Fig. 9 , Fig.10 , Fig. 9 A schematic diagram showing the return connection line of the motor stator winding structure according to another embodiment of the present invention is shown. Fig.10 Show Fig. 9 The ends of the return connection wires RW3 and RW4 and the portions protruding from the insertion side 110a of the core are arranged in the slot layer L1 closest to the rotor accommodation space 150. Fig. 9 It can be seen that the return connection wire RW3 and the return connection wire RW4 have top portions, and their heights in the axial direction AD are roughly aligned. Specifically, the return connection wire RW3 and the return connection wire RW4 have similar profiles but are smaller than the return connection wire RW4, so the return connection wire RW3 can be placed inside the profile of the return connection wire RW4 along the axial direction AD, thereby reducing the wire turns and the axial space, and reducing the assembly process. Fig.10 It can be seen that the parts of the return connection wires RW3 and RW4 protruding from the insertion side 110a of the core are aligned in the axial direction AD and are both located in the slot layer L1. The return connection wires RW3 and RW4 are both applicable to the windings Y1 and Y2 of the U, V, and W phases, so the same set of return connection wires RW3 and RW4 can correspond to the assembly of the windings Y1 and Y2 at the same time, reducing the material preparation cost.

[0066] The return connecting wires of different phases are used to connect the windings in opposite directions in the same slot layer (e.g., L1). The portions of the return connecting wires protruding from the insertion side 110a of the core 110 may not overlap each other in the radial direction RD or the axial direction AD. For example, the return connecting wire of the U phase (e.g., Figure 4 RWU1, RWU2), V-phase return connection line (such as Figure 5 RWV1, RWV2) and W phase return connection line (as shown Figure 6 As shown in RWW1, RWW2), the portions protruding from the insertion side 110a of the core 110 do not overlap each other in the radial direction RD (refer to Figure 8 , Fig.10 Or, the U-phase return connection line (such as Figure 4 RWU1, RWU2), V-phase return connection line (such as Figure 5 RWV1, RWV2) and W phase return connection line (as shown Figure 6 As shown in RWW1, RWW2), the portions protruding from the insertion side 110a of the core 110 do not overlap each other in the axial direction AD (refer to Figure 7 , Fig. 9 In other embodiments of the present invention, the U-phase return connection line (such as Figure 4 RWU1, RWU2) shown in the figure, V phase return connection line (such as Figure 5 Any one of RWV1, RWV2) and the W phase return connection line (such as Figure 6 In any of the RWW1 and RWW2 shown, the portion protruding from the insertion side 110a of the core 110 does not overlap each other in the axial direction AD. In an embodiment of the present invention, all return connection wires are connection wires in the same slot layer, for example, the two ends of the return connection wire are arranged in the slot layer (L1) closest to the rotor accommodating space 150.

[0067] The above example uses 48 slots for the hairpin conductor stator of the present invention, but the specific number of slots of the stator is not limited. The above example uses 2 (phase) slots for each U phase, V phase, and W phase, but more than 2 (phase) slots can meet the requirements of the above winding method.

[0068] The winding structure of the motor stator of the present invention is configured in different polar regions through the wire entry slots of different phase windings through the above-mentioned winding method. For example, the wire entry slots of the winding of a specific phase are offset so that the parts of the return connecting wires of the different phase windings protruding from the insertion side of the iron core do not overlap each other in the radial direction. Therefore, the design of the return connecting wires can be simplified and the three-phase windings can share the return connecting wires. The shapes and types of the return connecting wires can also be reduced, which effectively controls the types of wires required for manufacturing the motor stator and the production complexity, and reduces the axial space configuration.

[0069] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A winding structure of a motor stator, comprising: A toroidal core defines a rotor accommodation space at the center, wherein the core includes an insertion side and an extension side for a plurality of hairpin-shaped conductors to be inserted from the insertion side and to pass through the extension side; A plurality of slots are located on the core, the plurality of slots are located in a circumferential direction around the rotor accommodation space and form a plurality of slot layers adjacent in a radial direction, the core comprises a plurality of pole regions, each of the plurality of pole regions comprises a plurality of phases, each of the plurality of phases comprises a plurality of phase slots, The plurality of slots of the corresponding plurality of phase slots in the plurality of pole regions are used for connecting any one of the plurality of hairpin conductors to form a plurality of windings in parallel, wherein the plurality of windings include: At least one first phase winding, configured to arrange the plurality of hairpin conductors starting from the first phase incoming line slot, and comprising a plurality of first phase return connection wires; At least one second phase winding, configured to arrange the plurality of hairpin conductors starting from the second phase incoming line slot, and comprising a plurality of second phase return connection wires; as well as At least one third phase winding, used to configure the plurality of hairpin conductors starting from the third phase incoming line slot, and comprising a plurality of third phase return connection lines, The first phase incoming line slot, the second phase incoming line slot and the third phase incoming line slot are respectively located in three different polar regions, Parts of the plurality of first-phase return connecting wires, the plurality of second-phase return connecting wires, and the plurality of third-phase return connecting wires protruding from the insertion side of the iron core do not overlap each other in the axial direction.

2. The winding structure of the motor stator according to claim 1, wherein the wire entry slot of the first phase, the wire entry slot of the second phase and the wire entry slot of the third phase are respectively located in three consecutive pole regions.

3. The winding structure of the motor stator according to claim 1, wherein the wire entry slot of the first phase, the wire entry slot of the second phase and the wire entry slot of the third phase are all arranged in the slot layer farthest from the rotor accommodating space.

4. The winding structure of the motor stator according to claim 1, wherein both ends of any one of the plurality of first-phase return connecting wires, the plurality of second-phase return connecting wires, and the plurality of third-phase return connecting wires are arranged at the slot layer closest to the rotor accommodating space.

5. A winding structure of a motor stator according to claim 1, wherein the spans of the multiple first-phase return connecting wires on the insertion side of the iron core are different from each other, the spans of the multiple second-phase return connecting wires on the insertion side of the iron core are different from each other, and the spans of the multiple third-phase return connecting wires on the insertion side of the iron core are different from each other.

6. The winding structure of the motor stator according to claim 5, wherein the span of any one of the multiple first-phase return connecting wires, the multiple second-phase return connecting wires, and the multiple third-phase return connecting wires on the insertion side of the iron core is one pole pitch plus 1 slot or one pole pitch minus 1 slot.

7. The winding structure of the motor stator according to claim 1, wherein each of the plurality of first-phase return connecting wires has a top portion aligned axially with each other, each of the plurality of second-phase return connecting wires has a top portion aligned axially with each other, and each of the plurality of third-phase return connecting wires has a top portion aligned axially with each other.

8. According to the winding structure of the motor stator of claim 1, each of the multiple first-phase return connecting wires has a top portion radially arranged and aligned with the rotor accommodating space, each of the multiple second-phase return connecting wires has a top portion radially arranged and aligned with the rotor accommodating space, and each of the multiple third-phase return connecting wires has a top portion radially arranged and aligned with the rotor accommodating space.

9. A winding structure of a motor stator according to claim 1, wherein the portion of each of the multiple first-phase return connecting wires protruding from the insertion side of the iron core is axially aligned with each other, the portion of each of the multiple second-phase return connecting wires protruding from the insertion side of the iron core is axially aligned with each other, and the portion of each of the multiple third-phase return connecting wires protruding from the insertion side of the iron core is axially aligned with each other.

10. According to the winding structure of the motor stator of claim 1, each of the multiple hairpin-shaped wires has a bending portion, a first leg and a second leg after assembly, the first leg and the second leg are respectively inserted into the corresponding phase slots from the insertion side of the iron core and pass through the extension side, and then are appropriately bent to be electrically connected to the first leg or the second leg corresponding to the adjacent hairpin-shaped wire, wherein the bending portion is located on the insertion side of the iron core.

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