Stator assembly featuring cross-pole phase arrangement and double short ends, and motor

Abstract

The present invention relates to the technical field of flat wire motors, and in particular to a stator assembly featuring cross-pole phase arrangement and double short ends, and a motor. The stator assembly comprises a stator core and stator windings. The stator core is provided with e stator slots, the number of poles of the stator windings is P, the number of slots per phase of each pole is Q, and b rectangular wires are arranged in each stator slot in the radial direction of the stator core, wherein e is an integer, P is an even number greater than or equal to 2, Q is an integer greater than or equal to 2, and b is an integer greater than or equal to 3. According to the present invention, the stator windings share the stator slots, so that the number of the stator slots that can be occupied by each phase winding is increased. End windings mainly use short-pitch wirings, with very few long-pitch and full-pitch wirings; and the ends of a stator have enough space for arranging the long-pitch and full-pitch wirings. The overall height of the end windings can be arranged according to the height of the short-pitch wirings, thereby achieving the effect of double short ends, and reducing the size of the ends on two sides.

Description

A stator assembly with double short ends arranged across pole phases and a motor

[0001] This application claims priority to Chinese Patent Application No. 202311660612.9, filed with the State Intellectual Property Office of the People's Republic of China on November 30, 2023, entitled "A Stator Assembly and Motor with Transpolar Phase Arrangement," and Chinese Patent Application No. 202420988659.1, filed with the State Intellectual Property Office of the People's Republic of China on May 8, 2024, entitled "A Stator Assembly and Motor with Double Short Ends." The entire contents of both prior patent applications are incorporated herein by reference. Technical Field

[0002] The present invention belongs to the technical field of flat wire motors, and in particular relates to a stator assembly and a motor with double short ends arranged across pole phases. Background Art

[0003] Domestic new energy vehicle drive motors are facing increasing power density requirements, increasingly compact motor layouts, and increasingly stringent NVH (Noise, Vibration, and Harshness) performance requirements. However, the high end dimensions of mainstream motors cannot meet these requirements. Therefore, motor solutions that combine high speed, compact size, and excellent NVH performance have become a key research focus within the industry.

[0004] Most existing flat-wire motor solutions use a wide variety of U-shaped wires for the motor windings, resulting in tall end windings. This results in a large overall motor size and significant production challenges. While some short-pitch motor solutions can reduce the end winding size, this only reduces the height at one end, leaving the other end still tall. Furthermore, NVH performance is limited.

[0005] Furthermore, traditional motor designs route windings for each phase only within the slots corresponding to the pole. For example, if there are four slots per pole and phase, each phase winding is routed only within the four consecutive, adjacent stator slots corresponding to each pole. For a single-phase winding, all four stator slots for the same pole are fully filled. This limits the number of viable motor designs.

[0006] Summary of the Invention

[0007] To address the above problems, the present invention provides a stator assembly with double short ends arranged across pole phases, the stator assembly comprising a stator core and a stator winding; the stator core is provided with e stator slots; the stator winding has a pole number P; the number of slots per pole per phase is Q; each stator slot is provided with b rectangular conductors radially along the stator core; wherein e is an integer, P is an even number greater than or equal to 2, Q is an integer greater than or equal to 2, and b is an integer greater than or equal to 3;

[0008] All stator slots are divided into a plurality of pole-phase small units along the circumferential direction of the stator core; each pole-phase small unit includes Q+K consecutive adjacent stator slots, wherein QK stator slots are single-phase stator slots and are continuously arranged at the center of each pole-phase small unit; K stator slots are shared stator slots on both sides of the single-phase stator slot; K is an integer, and 1≤K<Q;

[0009] In the same phase winding, the number of conductors occupied in each single-phase stator slot in each pole-phase unit is b; the number of conductors occupied in each of the K common stator slots on one side is a, and the number of conductors occupied in each of the K common stator slots on the other side is ba;

[0010] For the K stator slots shared by any two adjacent pole-phase small units, a conductors in each stator slot belong to one phase winding; ba conductors in each stator slot belong to another phase winding; where a is an integer and 1≤a≤b / 2.

[0011] Furthermore, the stator winding has one end portion connected in a manner that: the c-numbered conductor in each stator slot is connected to the c+1-numbered conductor in another stator slot; wherein 1<c<b, and c is an even number; and the remaining conductors in each stator slot are connected to the conductors in the same layer in another stator slot;

[0012] The stator winding is connected at the other end by connecting the d-number conductor in each stator slot to the d+1-number conductor in another stator slot; wherein 1≤d<b, and d is an odd number; and the remaining conductors in each stator slot are connected to the conductors in the same layer in another stator slot.

[0013] Furthermore, the span mode of one end portion of the stator winding is a combined span mode; and the span mode of the other end portion is a single span mode.

[0014] Furthermore, when the number b of wires in each stator slot is an even number, the connection method of one end portion of the stator winding includes: connecting wire No. 1 in each stator slot to wire No. 1 in another stator slot; connecting wire No. c in each stator slot to wire No. c+1 in another stator slot; and connecting wire No. b in each stator slot to wire No. b in another stator slot; wherein 1<c<b, and c is an even number; and a combined span method is adopted at this end portion;

[0015] The stator winding is connected at the other end by connecting the d-number conductor in each stator slot to the d+1-number conductor in another stator slot; wherein 1≤d<b, and d is an odd number; and a single span is used at the end.

[0016] Furthermore, when the number b of wires in each stator slot is an odd number, the connection method of one end portion of the stator winding includes: connecting wire No. 1 in each stator slot to wire No. 1 in another stator slot; connecting wire No. c in each stator slot to wire No. c+1 in another stator slot; wherein 1<c<b, and c is an even number; and adopting a combined span method at this end portion;

[0017] The stator winding is connected at the other end by connecting the conductor No. d in each stator slot to the conductor No. d+1 in another stator slot; and connecting the conductor No. b in each stator slot to the conductor No. b in another stator slot; wherein 1≤d<b, and d is an odd number; and a single span is used at the end on this side.

[0018] Furthermore, when the number b of wires in each stator slot is an odd number, the connection method of one end portion of the stator winding includes: connecting wire No. 1 in each stator slot to wire No. 1 in another stator slot; connecting wire No. c in each stator slot to wire No. c+1 in another stator slot; wherein 1<c<b, and c is an even number; and a single span method is used at this end portion;

[0019] The stator winding is connected at the other end by connecting the conductor No. d in each stator slot to the conductor No. d+1 in another stator slot; and connecting the conductor No. b in each stator slot to the conductor No. b in another stator slot; wherein 1≤d<b, and d is an odd number; and a combined span method is used at the end on this side.

[0020] Furthermore, the combined span mode may be a combination of a long span and a first short span; a combination of a full span and a first short span; or any combination of a long span, a full span and a first short span.

[0021] The single span method refers to using only the second short span.

[0022] Furthermore, the calculation formula of the whole distance is: J=e / P;

[0023] The range of the long distance is: J<M≤J+Q+K-1;

[0024] The range of the first short distance is: JQ-K+1≤N<J;

[0025] The calculation formula of the second short distance is: L=JK;

[0026] Wherein, J is the full pitch; e is the number of stator slots; P is the number of poles of the stator winding; M is the long pitch; Q is the number of slots per pole per phase; K is an integer with 1≤K<Q; N is the first short pitch; L is the second short pitch.

[0027] The present invention also provides a motor with double short ends arranged across pole phases, the motor comprising the stator assembly.

[0028] The beneficial effects of the present invention are:

[0029] 1. The stator windings provided by the present invention utilize shared stator slots, increasing the number of stator slots occupied by each phase winding. The end windings primarily utilize short-pitch windings, with very few long-pitch and full-pitch end windings. Furthermore, ample space is available at the stator ends for both long-pitch and full-pitch windings. The overall height of the end windings can be aligned with the height of the short-pitch end windings, achieving a double-low end effect. This also reduces the size of the end windings on both sides, further reducing the overall size of the motor.

[0030] 2. The stator assembly provided by the present invention utilizes a short-pitch winding arrangement, effectively reducing the end winding height and the space required for the motor winding ends. This reduces copper wire, reduces resistance, lowers costs, and improves motor efficiency. Furthermore, compared to existing full-pitch motor solutions, the double-low-end motor provided by the present invention can reduce 5th or 7th-order harmonics. This improves the motor current waveform, increases motor system efficiency, reduces motor noise, and enhances NVH performance.

[0031] 3. The wire outlet position of the stator assembly provided by the present invention can be flexibly switched between the hairpin end and the welding end, enriching the winding scheme of the short-spacing flat wire motor. The welding end span is consistent with the twist angle, and the manufacturing process is good.

[0032] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] FIG1 shows a schematic diagram of a rectangular conductor arrangement structure in a stator slot according to an embodiment of the present invention;

[0035] FIG2 shows a schematic structural diagram of a pole phase small unit when the number of conductors in a full slot is an even number according to an embodiment of the present invention;

[0036] FIG3 shows a schematic structural diagram of a stator assembly according to Embodiment 1 of the present invention;

[0037] FIG4 shows a schematic structural diagram of a stator assembly according to Embodiment 2 of the present invention;

[0038] FIG5 shows a schematic structural diagram of a stator assembly according to Embodiment 3 of the present invention;

[0039] FIG6 shows a schematic structural diagram of a stator assembly according to Embodiment 4 of the present invention;

[0040] FIG7 shows a schematic structural diagram of a stator assembly according to Embodiment 5 of the present invention. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0042] An embodiment of the present invention provides a motor with double short ends arranged across pole phases, the motor comprising a stator assembly. The stator assembly comprises a stator core and a stator winding; the stator core is generally cylindrical so as to accommodate the motor rotor assembly within the stator core. The stator core is provided with e stator slots, which are arranged sequentially along the circumference of the stator core in an annular array; the stator winding has a pole number P; the number of slots per pole per phase is Q; the stator winding is wound using rectangular wires, and b rectangular wires are arranged in each stator slot along the radial direction of the stator core; wherein e is an integer, P is an even number greater than or equal to 2, Q is an integer greater than or equal to 2, and b is an integer greater than or equal to 3.

[0043] All stator slots are divided into a number of pole-phase small units along the circumferential direction of the stator core; each pole-phase small unit includes Q+K consecutive adjacent stator slots, wherein QK stator slots are single-phase stator slots, which are continuously arranged at the center of each pole-phase small unit; there are K stator slots on both sides of the single-phase stator slot as shared stator slots; K is an integer, and 1≤K<Q.

[0044] Specifically, in the same phase winding, the number of wires occupied in each single-phase stator slot in each pole-phase small unit is b; the number of wires occupied per slot of the K common stator slots on one side is a, and the number of wires occupied per slot of the K common stator slots on the other side is ba.

[0045] For any two adjacent pole-phase units sharing K stator slots, a conductors in each stator slot belong to one phase winding, and b a conductors in each stator slot belong to the other phase winding. Here, a is an integer, and 1≤a≤b / 2.

[0046] For the convenience of description, in an embodiment of the present invention, the rectangular wires in the same stator slot are numbered along the direction from the outer wall of the stator core to the axial center of the stator core, as shown in Figure 1, and are respectively marked as wire No. 1, wire No. 2, ..., wire No. b-1 and wire No. b.

[0047] Along the circumference of the stator core, the stator slots are named Z1, Z2, Z3, ..., Ze-1, and Ze, respectively; where e is the number of stator slots on the stator core. For example, Z1(1) represents the conductor 1 in the Z1 stator slot, and Z2(3) represents the conductor 3 in the Z2 stator slot.

[0048] For example, as shown in FIG2 , all stator slots are divided into N pole-phase small units along the circumference of the stator core; each pole-phase small unit includes six consecutive adjacent stator slots; and any two adjacent pole-phase small units share two stator slots. That is, Q = 4, K = 2.

[0049] Specifically, the first pole phase small unit includes stator slot No. Z1, stator slot No. Z2, stator slot No. Z3, stator slot No. Z4, stator slot No. Z5 and stator slot No. Z6; the second pole phase small unit includes stator slot No. Z5, stator slot No. Z6, stator slot No. Z7, stator slot No. Z8, stator slot No. Z9 and stator slot No. Z10; the third pole phase small unit includes stator slot No. Z9, stator slot No. Z10, stator slot No. Z11, stator slot No. Z12, stator slot No. Z13 and stator slot No. Z14;…; the Nth pole phase small unit includes stator slot No. Ze-3, stator slot No. Ze-2, stator slot No. Ze-1, stator slot No. Ze, stator slot No. Z1 and stator slot No. Z2.

[0050] When the stator winding is a three-phase winding, the 1st pole-phase small unit, the 4th pole-phase small unit, ..., the N-2th pole-phase small unit are used to arrange the first phase winding of the stator winding; the 2nd pole-phase small unit, the 5th pole-phase small unit, ..., the N-1th pole-phase small unit are used to arrange the second phase winding of the stator winding; the 3rd pole-phase small unit, the 6th pole-phase small unit, ..., the Nth pole-phase small unit are used to arrange the third phase winding of the stator winding.

[0051] For example, as shown in Figure 2, each stator slot can have up to eight conductors arranged radially along the stator core. That is, when the slots are fully populated, eight conductors are arranged in each stator slot. The first-phase winding has eight conductors arranged in each slot of stator slots Z3 and Z4; the first-phase winding has four conductors arranged in each slot of stator slots Z5 and Z6, specifically conductors 2, 4, 6, and 8; the first-phase winding has four conductors arranged in each slot of stator slots Z1 and Z2, specifically conductors 1, 3, 5, and 7. Stator slots Z5 and Z6 are shared stator slots for the first and second pole-phase small units; conductors 1, 3, 5, and 7 in each slot of stator slots Z5 and Z6 are conductors for the second-phase winding. Stator slot No. Z1 and stator slot No. Z2 are shared stator slots for the 1st pole phase small unit and the Nth pole phase small unit; wire No. 2, wire No. 4, wire No. 6 and wire No. 8 in each slot of stator slot No. Z1 and stator slot No. Z2 are wires of the third phase winding.

[0052] For another example, each stator slot can have up to seven conductors arranged radially along the stator core. That is, when the slots are fully occupied, each stator slot has seven conductors. In this case, the first-phase winding has seven conductors arranged in each slot of stator slots Z3 and Z4; the first-phase winding has two conductors arranged in each slot of stator slots Z5 and Z6, specifically conductors 1 and 2; and the first-phase winding has five conductors arranged in each slot of stator slots Z1 and Z2, specifically conductors 3, 4, 5, 6, and 7. Stator slots Z5 and Z6 are shared stator slots for the first and second pole-phase subunits; conductors 3, 4, 5, 6, and 7 in each slot of stator slots Z5 and Z6 are conductors for the second-phase winding. Stator slot No. Z1 and stator slot No. Z2 are shared stator slots for the 2nd pole phase small unit and the Nth pole phase small unit; conductor No. 1 and conductor No. 2 in each of stator slot No. Z1 and stator slot No. Z2 are conductors of the third phase winding.

[0053] The stator windings provided by the present invention utilize shared stator slots, increasing the number of stator slots occupied by each phase winding. The end windings primarily utilize short-pitch windings, with minimal long-pitch and full-pitch end windings. Furthermore, ample space is available at the stator ends for both long-pitch and full-pitch windings. The overall height of the end windings can be aligned with the height of the short-pitch end windings, achieving a double-low end effect. This also reduces the size of the end windings on both sides, further reducing the overall size of the motor.

[0054] Furthermore, the connection method of one end of the stator winding includes: connecting the c-numbered wire in each stator slot with the c+1-numbered wire in another stator slot; wherein 1<c<b, and c is an even number; and connecting the remaining wires in each stator slot with the same-layer wires in another stator slot.

[0055] The stator winding is connected at the other end by connecting the d-number conductor in each stator slot to the d+1-number conductor in another stator slot; wherein 1≤d<b, and d is an odd number; and the remaining conductors in each stator slot are connected to the conductors in the same layer in another stator slot.

[0056] The span mode of one end portion of the stator winding is a combined span mode; the span mode of the other end portion is a single span mode.

[0057] Exemplarily, when the number of wires in each stator slot is an even number, that is, b is an even number greater than or equal to 4, the connection method of one end of the stator winding includes: wire No. 1 in each stator slot is connected to wire No. 1 in another stator slot; wire No. c in each stator slot is connected to wire No. c+1 in another stator slot; wire No. b in each stator slot is connected to wire No. b in another stator slot; wherein 1<c<b, and c is an even number; and a combined span method is adopted at this end.

[0058] The stator winding is connected at the other end by connecting the d-number conductor in each stator slot to the d+1-number conductor in another stator slot; wherein 1≤d<b, and d is an odd number; and a single span is used at the end.

[0059] For another example, when the number of conductors in each stator slot is an odd number, that is, when b is an odd number greater than or equal to 3, the connection method of one end portion of the stator winding includes: conductor No. 1 in each stator slot is connected to conductor No. 1 in another stator slot; conductor No. c in each stator slot is connected to conductor No. c+1 in another stator slot; wherein 1<c<b, and c is an even number; and a combined span method is adopted at this end portion.

[0060] The stator winding is connected at the other end by connecting the conductor No. d in each stator slot to the conductor No. d+1 in another stator slot; and connecting the conductor No. b in each stator slot to the conductor No. b in another stator slot; wherein 1≤d<b, and d is an odd number; and a single span is used at the end on this side.

[0061] For another example, when the number of wires in each stator slot is an odd number, that is, when b is an odd number greater than or equal to 3, the connection method of one end of the stator winding includes: wire No. 1 in each stator slot is connected to wire No. 1 in another stator slot; wire No. c in each stator slot is connected to wire No. c+1 in another stator slot; wherein 1<c<b, and c is an even number; and a single span method is adopted at this end.

[0062] The stator winding is connected at the other end by connecting the conductor No. d in each stator slot to the conductor No. d+1 in another stator slot; and connecting the conductor No. b in each stator slot to the conductor No. b in another stator slot; wherein 1≤d<b, and d is an odd number; and a combined span method is used at the end on this side.

[0063] Specifically, the combined span mode may adopt any combination of a long span and a first short span; a full span and a first short span; or a long span, a full span and a first short span.

[0064] The calculation formula of the full pitch is: J=e / P; wherein J is the full pitch, e is the number of stator slots, and P is the number of poles of the stator winding;

[0065] The range of the long distance is: J<M≤J+Q+K-1; wherein, M is the long distance, J is the whole distance, Q is the number of slots per pole and per phase, K is an integer, and 1≤K<Q.

[0066] The range of the first short distance is: JQ-K+1≤N<J; wherein N is the first short distance, J is the full distance, and Q is the number of slots per pole and per phase.

[0067] Specifically, the single span method refers to using only the second short distance; the calculation formula of the second short distance is: L=JK; where L is the second short distance, J is the whole distance, K is an integer, and 1≤K<Q, Q is the number of slots per pole and per phase.

[0068] It should be noted that, in a stator winding solution, the value of the long distance can be 1 or more; the value of the first short distance can be 1 or more, and the value of the second short distance is only one.

[0069] The stator assembly provided by the present invention utilizes a short-pitch winding arrangement, effectively reducing the end winding height and the space required for the motor winding ends. This reduces copper wire, reduces resistance, lowers costs, and improves motor efficiency. Furthermore, as shown in Table 1, the double-low-end motor provided by the present invention can reduce 5th and 7th-order harmonics compared to existing full-pitch motor solutions. This improves the motor current waveform, increases motor system efficiency, and reduces motor noise, resulting in better NVH performance.

[0070] Table 1 Motor harmonic comparison table

[0071] Furthermore, the stator winding lead wires and / or star point wire can be located at either the hairpin or welding end. When the stator assembly is wired at the hairpin, the lead wires and star point wires from the same branch of the original welding end are connected. Any hairpin wire at the hairpin is split into two I-pin wires, one of which can be used as a lead wire and the other as a star point wire. The stator assembly provided by the present invention can flexibly switch between the hairpin and welding ends, enriching the winding options for short-pitch flat wire motors. Furthermore, the welding end span is consistent with the twist angle, improving manufacturing processability.

[0072] Example 1

[0073] In this embodiment, the number b of rectangular conductors in each stator slot is an even number greater than or equal to 4; each pole-phase unit includes 3 consecutive stator slots, where the number of slots per pole and per phase is Q=2; and the number of shared stator slots on each side is K=1.

[0074] The stator winding adopts a combined span of a long distance M=7 and a first short distance N=5 at one end, and adopts a single span of a second short distance L=5 at the other end.

[0075] The stator winding is composed of a plurality of minimum winding units connected in series and / or in parallel.

[0076] For example, a winding path of a minimum winding unit is: Z1(b)→Z8(b)→Z3(b-1)→Z8(b-2)→Z3(b-3)→Z8(b-4)→…→Z3(5)→Z8(4)→Z3(3)→Z8(2)→Z3(1)→Z8(1)→Z13(2)→Z8(3)→Z13(4)→Z8(5)→Z13(6)→…→Z8(b-1). Wherein, b is the number of rectangular wires in each stator slot, b≥4, and b is an even number.

[0077] It should be noted that the winding path of the aforementioned minimum winding unit is merely an example of a winding path for the minimum winding unit, used to illustrate the winding path patterns of each minimum winding unit. The winding path patterns of each minimum winding unit in the stator winding are identical, each phase winding and each branch of the stator winding have the same number of components, each branch passes through the same number of stator slots and layers, each branch has the same back EMF phase and magnitude, and each branch has the same resistance and inductance at its beginning and end, thus achieving a balanced state of the stator winding and improving motor performance.

[0078] As shown in Figure 3, in this embodiment, for any phase winding, at the hairpin end, a long-distance winding with a length M = 7 is used only to connect the b-wires of the two stator slots, located near the inner circle of the stator core. The number of long-distance windings is P, where P is the number of poles. The remaining layers of the hairpin end are all connected using short-distance windings with a first short-distance N = 5. At the hairpin end, the innermost long-distance winding does not affect the overall end height of the other short-distance windings, and the hairpin end has ample space to arrange the innermost long-distance winding.

[0079] At the twisting end, only the short moment end winding with the second short distance L=5 is used.

[0080] Therefore, in this embodiment, the overall height of the windings on both sides can be arranged according to the height of the short-distance winding, achieving the effect of double short ends, while reducing the size of the ends on both sides, further reducing the overall size of the motor.

[0081] Example 2

[0082] In this embodiment, the number b of rectangular wires in each stator slot is an even number greater than or equal to 4; each pole-phase unit includes 4 consecutive stator slots, where the number of slots per pole and per phase is Q=3, and the number of shared stator slots on each side is K=1.

[0083] The stator winding adopts a combined span of full pitch J=9, long pitch M=11 and first short pitch N of 7 and 8 at one end; and adopts a single span of second short pitch L=8 at the other end.

[0084] The stator winding is composed of a plurality of minimum winding units connected in series and / or in parallel.

[0085] For example, a winding path of the minimum winding unit is: Z2(1)→Z10(1)→Z2(2)→Z10(3)→…→Z2(b-4)→Z10(b-3)→Z2(b-2)→Z10(b-1)→Z2(b)→Z13(b)→Z21(b-1)→Z13(b-2)→Z21(b-3)→Z13(b-4)→…→Z21(5)→Z13(4)→Z21(3)→Z13(2)→Z21(1)→Z30(1)→Z22(2)→Z30(3)→…→Z22(b-4)→Z30(b-3)→Z22(b-2)→Z30(b-1) →Z22(b)→Z29(b)→Z37(b-1)→Z29(b-2)→Z37(b-3)→Z29(b-4)→…→Z37(5)→Z29(4)→Z37(3)→Z29(2)→Z37(1)→Z29(1)→Z21(2)→Z29(3)→…→Z2 1(b-4)→Z29(b-3)→Z21(b-2)→Z29(b-1)→Z21(b)→Z30(b)→Z38(b-1)→Z30(b-2)→Z38(b-3)→Z30(b-4)→…→Z38(5)→Z30(4)→Z38(3)→Z30(2). Wherein, b is the number of rectangular conductors in each stator slot, b ≥ 4, and b is an even number.

[0086] It should be noted that the winding path of the aforementioned minimum winding unit is merely an example of a winding path for the minimum winding unit, used to illustrate the winding path patterns of each minimum winding unit. The winding path patterns of each minimum winding unit in the stator winding are identical, each phase winding and each branch of the stator winding have the same number of components, each branch passes through the same number of stator slots and layers, each branch has the same back EMF phase and magnitude, and each branch has the same resistance and inductance at its beginning and end, thus achieving a balanced state of the stator winding and improving motor performance.

[0087] As shown in Figure 4, in this embodiment, for any phase winding, at the hairpin end, a long-distance winding with a length M = 11 is used only to connect the b conductors of two stator slots, located near the inner circumference of the stator core; and the number of long-distance windings is only P, where P is the number of poles. A full-distance winding with a full-distance J = 9 is used only to connect the b conductors of two stator slots or the 1 conductors of two stator slots, located near the inner and outer circumferences of the stator core; and the number of full-distance windings is only 2P, where P is the number of poles. The remaining layers of the hairpin end are connected using short-distance windings with a first short distance N of 7 or 8. At the hairpin end, the long-distance windings and full-distance windings in the innermost and outermost layers do not affect the overall end height of the other short-distance windings, and the hairpin end has sufficient space to arrange the long-distance windings and full-distance windings in the innermost and outermost layers.

[0088] At the twisting end, only the short moment end winding with the second short distance L=8 is used.

[0089] Therefore, in this embodiment, the overall height of the windings on both sides can be arranged according to the height of the short-distance winding, achieving the effect of double short ends, while reducing the size of the ends on both sides, further reducing the overall size of the motor.

[0090] Example 3

[0091] In this embodiment, the number b of rectangular wires in each stator slot is an even number greater than or equal to 4; each pole-phase unit includes 6 stator slots, where the number of slots per pole and per phase is Q=4, and the number of shared stator slots on each side is K=2.

[0092] The stator winding adopts a combined span mode of full pitch J=12 and first short pitch N of 9, 10 and 11 at one end; and adopts a single span mode of second short pitch L=10 at the other end.

[0093] The stator winding is composed of a plurality of first minimum winding units and second minimum winding units connected in series and / or in parallel.

[0094] Exemplarily, a winding path of the first minimum winding unit is: Z2(1)→Z13(1)→Z3(2)→Z13(3)→Z3(4)→Z13(5)→……→Z3(b-2)→Z13(b-1)→Z3(b)→Z15(b)→Z25(b-1)→Z15(b-2)→Z25(b-3)→Z15(b-4)→……→Z15(6)→Z25(5)→Z15(4)→Z25(3)→Z15(2).

[0095] A winding path of the second smallest winding unit is: Z23(1)→Z14(1)→Z4(2)→Z14(3)→Z4(4)→Z14(5)→…→Z4(b-2)→Z14(b-1)→Z4(b)→Z16(b)→Z26(b-1)→Z16(b-2)→Z26(b-3)→Z16(b-4)→…→Z16(6)→Z26(5)→Z16(4)→Z26(3)→Z16(2). Where b is the number of rectangular wires in each stator slot, b≥4, and b is an even number.

[0096] It should be noted that the winding path of the aforementioned minimum winding unit is merely an example of the winding path of the minimum winding unit used in the stator winding, and is used to illustrate the winding path pattern of each minimum winding unit. The winding path pattern of each minimum winding unit in the stator winding is the same, the number of components in each branch of each phase winding of the stator winding is the same, the number of stator slots and layers passed through each branch are the same, the back EMF of each branch is the same in phase and magnitude, and the resistance and inductance at the beginning and end of each branch are the same, thus achieving a balanced state of the stator winding and improving motor performance.

[0097] As shown in Figure 5, in this embodiment, for any phase winding, at the hairpin end, a full-pitch winding with a pitch of J = 12 is used only to connect the b-wires of the two stator slots, located near the inner circle of the stator core. The number of full-pitch windings is P, where P is the number of poles. The remaining layers of the hairpin end are connected using short-pitch windings with a first short pitch N of 9, 10, or 11. At the hairpin end, the innermost layer of full-pitch windings does not affect the overall end height of the other short-pitch windings, and the hairpin end has ample space to accommodate the innermost layer of full-pitch windings.

[0098] At the turning end, only the short-distance end winding of the second short distance L=10 is used.

[0099] Therefore, in this embodiment, the overall height of the end windings on both sides can be arranged according to the height of the short-distance end windings, achieving the effect of double short ends, while reducing the size of the ends on both sides, further reducing the overall size of the motor.

[0100] Example 4

[0101] In this embodiment, the number b of rectangular wires in each stator slot is an odd number greater than or equal to 3; each pole-phase unit includes 3 stator slots, where the number of slots per pole and per phase is Q=2, and the number of shared stator slots on each side is K=1.

[0102] The stator winding adopts a combined span of a long distance M=7 and a first short distance N=5 at one end, and adopts a single span of a second short distance L=5 at the other end.

[0103] The stator winding is composed of a plurality of first minimum winding units or a plurality of second minimum winding units connected in series and / or in parallel.

[0104] Exemplarily, a winding path of the first minimum winding unit is: Z2(1)→Z7(2)→Z2(3)→Z7(4)→…→Z2(b-2)→Z7(b-1)→Z2(b)→Z9(b)→Z14(b-1)→Z9(b-2)→Z14(b-3)→…→Z9(5)→Z14(4)→Z9(3)→Z14(2)→Z9(1).

[0105] A winding path of the second smallest winding unit is Z7(b)→Z2(b-1)→Z7(b-2)→Z2(b-3)→…→Z7(5)→Z2(4)→Z7(3)→Z2(2)→Z7(1)→Z14(1)→Z9(2)→Z14(3)→Z9(4)→…→Z14(b-2)→Z9(b-1)→Z14(b). Where b is the number of rectangular wires in each stator slot, b≥3, and b is an odd number.

[0106] It should be noted that the winding path of the aforementioned minimum winding unit is merely an example of one winding path of two possible minimum winding units for the stator winding, and is used to illustrate the winding path patterns of various minimum winding units. In this embodiment, the stator winding adopts only one winding path pattern, that of the first minimum winding unit or the second minimum winding unit.

[0107] The winding path pattern of each minimum winding unit in the stator winding is the same, the number of components of each branch of each phase winding of the stator winding is the same, the number of stator slots and the number of layers passed by each branch are the same, the back electromotive force of each branch is the same in phase and magnitude, and the resistance and inductance at the beginning and end of each branch are the same, thereby achieving a balanced state of the stator winding and improving motor performance.

[0108] As shown in Figure 6, in this embodiment, for any phase winding, a long-distance winding with a length of M = 7 is used at the hairpin end to connect the b-type conductors of the two stator slots, located near the inner circle of the stator core. The number of long-distance windings is P, where P is the number of poles. The remaining layers of the hairpin end are connected using short-distance windings with a first short distance of N = 5. At the hairpin end, the innermost long-distance winding does not affect the overall end height of the other short-distance windings, and the hairpin end has sufficient space to arrange the innermost long-distance winding.

[0109] At the turning end, only the short-distance end winding of the second short distance L=5 is used.

[0110] Therefore, in this embodiment, the overall height of the end windings on both sides can be arranged according to the height of the short-distance end windings, achieving the effect of double short ends, while reducing the size of the ends on both sides, further reducing the overall size of the motor.

[0111] Example 5

[0112] In this embodiment, the number b of rectangular wires in each stator slot is an odd number greater than or equal to 3; each pole-phase unit includes 6 stator slots, where the number of slots per pole and per phase is Q=4, and the number of shared stator slots on each side is K=2.

[0113] The stator winding adopts a combined span mode with long distances M of 13 and 15 and a first short distance N=10 at one end; and adopts a single span mode with a second short distance L=10 at the other end.

[0114] The stator winding is composed of a plurality of minimum winding units connected in series and / or in parallel.

[0115] For example, a winding path of the minimum winding unit is Z1(1)→Z16(1)→Z6(2)→Z16(3)→Z6(4)→……→Z16(b-2)→Z6(b-1)→Z16(b)→Z26(b)→Z16(b-1)→Z26(b-2)→Z16(b-3)→……→Z26(5)→Z16(4)→Z26(3)→Z16(2)→Z26(1)→Z39(1)→Z29(2)→Z39(3)→Z29(4)→……→Z39(b-2)→Z29(b-1)→Z39(b) Z49(b)→Z39(b-1)→Z49(b-2)→Z39(b-3)→……→Z49(5)→Z39(4)→Z49(3)→Z39(2). Where b is the number of rectangular conductors in each stator slot, b≥3, and b is an odd number.

[0116] It should be noted that the winding path of the aforementioned minimum winding unit is merely an example of a winding path for the minimum winding unit, used to illustrate the winding path patterns of each minimum winding unit. The winding path patterns of each minimum winding unit in the stator winding are identical, each phase winding and each branch of the stator winding have the same number of components, each branch passes through the same number of stator slots and layers, each branch has the same back EMF phase and magnitude, and each branch has the same resistance and inductance at its beginning and end, thus achieving a balanced state of the stator winding and improving motor performance.

[0117] As shown in Figure 7, in this embodiment, for any phase winding, at the hairpin end, long-distance windings with a length M of 13 or 15 are used only to connect the No. 1 conductors of the two stator slots, located near the outer circumference of the stator core. The number of long-distance windings is limited to 2P, where P is the number of poles. The remaining layers of the hairpin end are connected using short-distance windings with a first short distance N of 10. At the hairpin end, the outermost long-distance winding does not affect the overall end height of the other short-distance windings, and the hairpin end has ample space for the innermost long-distance winding.

[0118] At the turning end, only the short-distance end winding of the second short distance L=10 is used.

[0119] Therefore, in this embodiment, the overall height of the windings on both sides can be arranged according to the height of the short-distance winding, achieving the effect of double short ends, while reducing the size of the ends on both sides, further reducing the overall size of the motor.

[0120] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly with double short ends arranged across poles, characterized in that: The stator assembly comprises a stator core and a stator winding; the stator core is provided with e stator slots; the number of poles of the stator winding is P; the number of slots per pole per phase is Q; each stator slot is provided with b rectangular wires along the radial direction of the stator core; wherein e is an integer, P is an even number greater than or equal to 2, Q is an integer greater than or equal to 2, and b is an integer greater than or equal to 3; All stator slots are divided into a number of pole-phase small units along the circumferential direction of the stator core; each pole-phase small unit includes Q+K consecutive adjacent stator slots, wherein QK stator slots are single-phase stator slots, which are continuously arranged at the center of each pole-phase small unit; K stator slots on both sides of the single-phase stator slot are shared stator slots; K is an integer, and 1≤K<Q; In the same phase winding, the number of wires occupied in each single-phase stator slot in each pole phase small unit is b; the number of wires occupied in each slot of the K common stator slots on one side is a, and the number of wires occupied in each slot of the K common stator slots on the other side is ba; For K stator slots shared by any two adjacent pole-phase small units, a wires in each stator slot belong to one phase winding; ba wires in each stator slot belong to another phase winding; where a is an integer, and 1≤a≤b / 2.

2. A stator assembly with double short ends arranged across poles according to claim 1, characterized in that: The end connection method of one side of the stator winding includes: connecting the c-numbered wire in each stator slot to the c+1-numbered wire in another stator slot; wherein 1<c<b, and c is an even number; and connecting the remaining wires in each stator slot to the wires in the same layer in another stator slot; The connection method of the stator winding at the other end includes: connecting the d-numbered wire in each stator slot with the d+1-numbered wire in another stator slot; wherein 1≤d<b, and d is an odd number; and connecting the remaining wires in each stator slot with the same-layer wires in another stator slot.

3. A stator assembly with double short ends arranged across poles according to claim 2, characterized in that: The span mode of one end of the stator winding is a combined span mode; the span mode of the other end is a single span mode.

4. The stator assembly with double short ends arranged across poles according to claim 1, characterized in that: When the number of wires b in each stator slot is an even number, the connection method of one end of the stator winding includes: connecting the No. 1 wire in each stator slot with the No. 1 wire in another stator slot; connecting the No. c wire in each stator slot with the No. c+1 wire in another stator slot; connecting the No. b wire in each stator slot with the No. b wire in another stator slot; wherein 1<c<b, and c is an even number; and adopting a combined span method at the end on this side; The connection method of the stator winding at the other end includes: connecting the d-numbered wire in each stator slot to the d+1-numbered wire in another stator slot; wherein 1≤d<b, and d is an odd number; and adopting a single span method at the end on this side.

5. The stator assembly with double short ends arranged across poles according to claim 1, characterized in that: When the number of wires b in each stator slot is an odd number, the connection method of one end of the stator winding includes: connecting the No. 1 wire in each stator slot to the No. 1 wire in another stator slot; connecting the No. c wire in each stator slot to the No. c+1 wire in another stator slot; wherein 1<c<b, and c is an even number; and adopting a combined span method at the end on this side; The connection method of the stator winding at the other side end includes: connecting the d-numbered wire in each stator slot with the d+1-numbered wire in another stator slot; connecting the b-numbered wire in each stator slot with the b-numbered wire in another stator slot; wherein 1≤d<b, and d is an odd number; and adopting a single span method at this side end.

6. The stator assembly with double short ends arranged across poles according to claim 1, characterized in that: When the number of wires b in each stator slot is an odd number, the connection method of one end of the stator winding includes: the No. 1 wire in each stator slot is connected to the No. 1 wire in another stator slot; the No. c wire in each stator slot is connected to the No. c+1 wire in another stator slot; wherein 1<c<b, and c is an even number; a single span method is adopted at the end on this side; The connection method of the stator winding at the other side end includes: connecting the d-numbered wire in each stator slot with the d+1-numbered wire in another stator slot; connecting the b-numbered wire in each stator slot with the b-numbered wire in another stator slot; wherein 1≤d<b, and d is an odd number; and adopting a combined span method at the end on this side.

7. A stator assembly with double short ends arranged across poles according to any one of claims 3 to 6, characterized in that: The combined span mode may be a combination of a long span and a first short span; a combination of a full span and a first short span; or any combination of a long span, a full span and a first short span; The single span mode refers to using only the second short span.

8. A stator assembly with double short ends arranged across poles according to claim 7, characterized in that: The calculation formula of the whole distance is: J = e / P; The range of the long distance is: J<M≤J+Q+K-1; The range of the first short distance is: JQ-K+1≤N<J; The calculation formula of the second short distance is: L=JK; Among them, J is the full pitch; e is the number of stator slots; P is the number of poles of the stator winding; M is the long pitch; Q is the number of slots per pole per phase; K is an integer, and 1≤K<Q; N is the first short pitch; L is the second short pitch.

9. A motor with double short ends arranged across the poles, characterized in that: The electric motor comprises the stator assembly according to any one of claims 1-8.

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