Stator and motor

Abstract

The present application discloses a stator and an electric motor. The stator includes: a stator core including a plurality of inner stator teeth and a stator yoke arranged in a ring shape, the plurality of inner stator teeth are circumferentially spaced apart on the inner side of the stator yoke and extend towards the central axis of the stator yoke, and stator slots are formed between adjacent inner stator teeth; a first-phase winding, a second-phase winding, and a third-phase winding are respectively wound around two adjacent inner stator teeth through two stator slots separated by one stator slot; wherein, the stator slots are radially divided into an inner layer space and an outer layer space along the stator yoke, and each of the first-phase winding, the second-phase winding, and the third-phase winding passes through the inner layer space of the two corresponding stator slots, or passes through the outer layer space of the two corresponding stator slots. By providing windings with a span of two slot pitches and defining that each winding passes through the inner layer space or the outer layer space of the two corresponding stator slots, the stator provided by the present application can improve the output torque and output power of the electric motor including the stator.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular, to a stator and a motor. Background Art

[0002] Low-power high-speed motors are increasingly widely used in the fields of automobiles, household appliances, medical devices, and robots, and the requirements for power density are also getting higher and higher. This requires that the motor not only needs to have a higher output power but also a smaller overall volume. Under the condition of the same rotational speed, the increase in power mainly depends on the increase in torque, and the winding structure with a larger winding coefficient is the key factor. On the other hand, the increase in power density is also related to the overall volume of the motor, and reducing the stator diameter or shortening the axial length are both key factors. In addition, compared with ordinary motors, high-speed motors have insufficient heat dissipation performance due to their high rotational speed, which further limits the power increase of high-speed motors. Summary of the Invention

[0003] The present application mainly provides a stator and a motor to solve the problem of low output torque and output power of the motor.

[0004] To solve the above technical problems, a technical solution adopted in the present application is: to provide a stator. The stator includes: a stator core including a plurality of inner stator teeth and a stator yoke arranged in a ring shape, the plurality of inner stator teeth are circumferentially spaced on the inner side of the stator yoke and extend towards the central axis of the stator yoke, and stator slots are formed between adjacent inner stator teeth; a first-phase winding, a second-phase winding, and a third-phase winding are respectively wound around two adjacent inner stator teeth through two stator slots separated by one stator slot; wherein, the stator slots are radially divided into an inner layer space and an outer layer space, and each of the first-phase winding, the second-phase winding, and the third-phase winding passes through the inner layer space of the corresponding two stator slots or passes through the outer layer space of the corresponding two stator slots.

[0005] In some embodiments, one of the inner layer space and the outer layer space of each stator slot is passed through by the first-phase winding, the second-phase winding, or the third-phase winding, and the other is in a vacant state not passed through by the first-phase winding, the second-phase winding, and the third-phase winding.

[0006] In some embodiments, the first-phase winding includes a first-phase inner-layer winding and a first-phase outer-layer winding, the second-phase winding includes a second-phase inner-layer winding and a second-phase outer-layer winding, and the third-phase winding includes a third-phase inner-layer winding and a third-phase outer-layer winding, wherein the first-phase inner-layer winding, the second-phase inner-layer winding, and the third-phase inner-layer winding respectively pass through the inner spaces of the two corresponding stator slots, and the first-phase outer-layer winding, the second-phase outer-layer winding, and the third-phase outer-layer winding respectively pass through the outer spaces of the two corresponding stator slots.

[0007] In some embodiments, the first-phase inner-layer winding, the second-phase inner-layer winding, and the third-phase inner-layer winding are sequentially staggered by two of the inner stator teeth along the circumferential direction of the stator yoke; the first-phase outer-layer winding, the second-phase outer-layer winding, and the third-phase outer-layer winding are sequentially staggered by two of the inner stator teeth along the circumferential direction of the stator yoke.

[0008] In some embodiments, the inner space is divided into a first sub-inner space and a second sub-inner space along the circumferential direction of the stator yoke, and the first-phase inner-layer winding, the second-phase inner-layer winding, and the third-phase inner-layer winding respectively pass through the first sub-inner space and the second sub-inner space of the two corresponding stator slots that are close to the two inner stator teeth to be wound;

[0009] The outer space is divided into a first sub-outer space and a second sub-outer space along the circumferential direction of the stator yoke, and the first-phase outer-layer winding, the second-phase outer-layer winding, and the third-phase outer-layer winding respectively pass through the first sub-outer space and the second sub-outer space of the two corresponding stator slots that are close to the two inner stator teeth to be wound.

[0010] In some embodiments, the stator yoke includes a plurality of sub-stator yokes spliced in sequence, at least two of the inner stator teeth are provided on each sub-stator yoke, the two inner stator teeth around which the first-phase outer-layer winding, the second-phase outer-layer winding, and the third-phase outer-layer winding are wound are located on the same sub-stator yoke, and the two inner stator teeth around which the first-phase inner-layer winding, the second-phase inner-layer winding, and the third-phase inner-layer winding are wound are located on two adjacent sub-stator yokes.

[0011] In some embodiments, a gap is reserved radially along the stator yoke between the first-phase inner-layer winding and the second-phase outer-layer winding and the third-phase outer-layer winding, a gap is reserved radially along the stator yoke between the second-phase inner-layer winding and the first-phase outer-layer winding and the third-phase outer-layer winding, and a gap is reserved radially along the stator yoke between the third-phase inner-layer winding and the first-phase outer-layer winding and the second-phase outer-layer winding.

[0012] In some embodiments, two of the first-phase winding, the second-phase winding, and the third-phase winding pass through the same inner space or outer space, and a gap is reserved between the two along the circumferential direction of the stator yoke.

[0013] In some embodiments, the portions of the first-phase outer winding, the second-phase outer winding, and the third-phase outer winding exposed from the outer spaces of the two stator slots through which they are respectively passed include two radial portions and one circumferential portion, wherein the radial portions extend towards the stator yoke along the radial direction of the stator yoke, and the circumferential portion extends along the circumferential direction of the stator yoke and connects the two radial portions.

[0014] In some embodiments, the stator core further includes a plurality of outer stator teeth, and the plurality of outer stator teeth are arranged at intervals on the outer side of the stator yoke.

[0015] In some embodiments, the first-phase winding, the second-phase winding, and the third-phase winding passing through the outer space run along the stator yoke and expose at least part of the outer space corresponding to the span thereof, and the spanned outer space is configured as a heat dissipation channel.

[0016] In some embodiments, the first-phase winding, the second-phase winding, and the third-phase winding passing through the outer space run from the inner side of the stator yoke to the outer side of the outer stator teeth away from the central axis of the stator yoke within a certain range and expose the outer space corresponding to the span thereof, and the spanned outer space is configured as a heat dissipation channel.

[0017] In some embodiments, the stator core further includes pole shoes, and the pole shoes are connected to the free ends of the inner stator teeth away from the stator yoke.

[0018] In some embodiments, the pole shoes and the inner stator teeth are of an integral structure, or the pole shoes and the inner stator teeth are detachably connected.

[0019] In some embodiments, a plug-in groove is provided at one end of the inner stator tooth away from the stator yoke, and a plug-in tooth is provided on the side of the pole shoe facing the inner stator tooth, and the plug-in tooth is in snap-fit connection with the plug-in groove.

[0020] In some embodiments, the number of the inner stator teeth and the stator slots is six respectively, and the number of the first-phase windings, the second-phase windings, and the third-phase windings is two respectively. The two first-phase windings, the two second-phase windings, and the two third-phase windings rotate 180 degrees with the central axis of the stator yoke as the rotation center, and the current directions are opposite.

[0021] To solve the above technical problems, another technical solution adopted in this application is: to provide an electric motor. The electric motor includes a rotor and a stator as described above, and the rotor is disposed inside the stator.

[0022] The beneficial effects of this application are as follows: Different from the prior art, this application discloses a stator and an electric motor. The stator provided in this application adopts a winding method with a span of 2 slot pitches. Compared with the winding method with a span of 1 slot pitch, the stator with a span of 2 slot pitches can significantly improve the winding coefficient, and thus improve the output torque and output power of the electric motor including the stator; and further limit that each of the first-phase winding, the second-phase winding, and the third-phase winding passes through the inner space of the corresponding two stator slots, or passes through the outer space of the corresponding two stator slots, so that the windings do not overlap with each other, thus reducing the axial length of the stator along the central axis of the stator yoke. Relatively speaking, the volume of the stator can be reduced, thereby improving the power density and further improving the output torque and output power of the electric motor including the stator. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0024] Figure 1 is a schematic structural diagram of the first embodiment of the stator provided by this application;

[0025] Figure 2 is Figure 1 a schematic structural diagram of the first embodiment of the stator core of the stator in

[0026] Figure 3 is Figure 1 a schematic structural diagram of the second embodiment of the stator core of the stator in

[0027] Figure 4 is Figure 1 a schematic structural diagram of the third embodiment of the stator core of the stator in

[0028] Figure 5 is Figure 1 a schematic structural diagram of the fourth embodiment of the stator core of the stator in

[0029] Figure 6 is Figure 5 a schematic structural diagram of the sub-stator yoke and the inner stator teeth of the stator core in

[0030] Figure 7 is Figure 3 orFigure 5 Schematic diagram of the pole shoe of the middle stator core;

[0031] Figure 8 Schematic diagram of the second embodiment of the stator provided by the present application;

[0032] Figure 9 Schematic diagram of the third embodiment of the stator provided by the present application;

[0033] Figure 10 Schematic diagram of the fourth embodiment of the stator provided by the present application;

[0034] Figure 11 Schematic diagram of the fifth embodiment of the stator provided by the present application;

[0035] Figure 12 Schematic diagram of the sixth embodiment of the stator provided by the present application;

[0036] Figure 13 Schematic diagram of the seventh embodiment of the stator provided by the present application;

[0037] Figure 14 Schematic diagram of the eighth embodiment of the stator provided by the present application;

[0038] Figure 15 Schematic diagram of the ninth embodiment of the stator provided by the present application;

[0039] Figure 16 Schematic diagram of an embodiment of the motor provided by the present application. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] The terms "first", "second", and "third" in the embodiments of the present application are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and explicitly defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] The present application provides a stator 100. Refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the stator provided by the present application.

[0044] The stator 100 generally includes a stator core 10, a first-phase winding 20, a second-phase winding 22, and a third-phase winding 24.

[0045] Next, the structure of the stator core 10 will be introduced first, and then the winding methods of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 on the stator core 10 will be described.

[0046] Refer to Figure 2 , the stator core 10 includes a plurality of inner stator teeth 12 and a stator yoke 14 arranged in a ring shape. The plurality of inner stator teeth 12 are circumferentially spaced on the inner side of the stator yoke 14 and extend towards the central axis of the stator yoke 14, thereby forming stator slots 13 between adjacent inner stator teeth 12.

[0047] For example, the stator core 10 includes six inner stator teeth 12, and the six inner stator teeth 12 are evenly distributed on the inner side of the stator yoke 14, and six stator slots 13 are formed between the six inner stator teeth 12.

[0048] In some embodiments, such as Figures 1 to 4As shown, the stator yoke 14 is an integral structure, and the whole stator yoke 14 can be in a circular ring shape or a regular polygon ring shape.

[0049] In some other embodiments, as Figure 5 shown, the stator yoke 14 includes a plurality of sub-stator yokes 140 spliced with each other. At least one inner stator tooth 12 is provided on each sub-stator yoke 140. The plurality of sub-stator yokes 140 are spliced in sequence and enclosed in a ring shape to form the stator core 10.

[0050] For example, the stator yoke 14 includes three sub-stator yokes 140, and two inner stator teeth 12 are provided on each sub-stator yoke 140. The three sub-stator yokes 140 are spliced and enclosed to form the stator core 10.

[0051] When the plurality of sub-stator yokes 140 are not combined into the stator core 10, each sub-stator yoke 140 is independent of each other and can be manufactured separately. Therefore, materials with smaller sizes can also be utilized to make the sub-stator yokes 140, improving the material utilization rate of manufacturing the stator core 10 and reducing the manufacturing cost of the stator core 10.

[0052] Specifically, as Figure 6 shown, one end of the sub-stator yoke 140 in the circumferential direction has a protrusion 141, and the other end of the sub-stator yoke 140 in the circumferential direction has a groove 143. The adjacent sub-stator yokes 140 are meshed and connected through the protrusion 141 and the groove 143.

[0053] For example, the protrusion 141 is semi-cylindrical, and the groove 143 is a semi-circular groove. The semi-cylindrical shape meshes with the semi-circular groove to connect two adjacent yoke parts 120. The protrusion 141 can also be triangular, and the groove 143 is correspondingly a triangular groove.

[0054] As long as the shapes of the protrusion 141 and the groove 143 can be meshed and connected with each other, the present application does not limit the shapes of the protrusion 141 and the groove 143.

[0055] In some embodiments, as Figure 2 and Figure 3 shown, the stator core 10 further includes pole shoes 15, and the pole shoes 15 are connected to the free ends of the inner stator teeth 12 away from the stator yoke 14.

[0056] One side of the pole shoe 15 facing the central axis of the stator yoke 140 is an arc surface, which is used to cooperate with the rotor. When the rotor is located in the space defined by the enclosure of a plurality of pole shoes 15, there is a gap between the arc surface and the rotor, so as to facilitate the rotation of the rotor relative to the stator 100.

[0057] There is a gap between adjacent pole shoes 15, and the circumferential arc length of the pole shoes 15 is greater than the circumferential width of the inner stator teeth 12, so that a relatively large and uniform magnetic field can be formed between the pole shoes 15 and the rotor, which is beneficial to improving the power density of the stator 100.

[0058] Optionally, as Figure 2 shown, the pole shoe 15 and the inner stator tooth 12 are of an integral structure, the pole shoe 15 and the inner stator tooth 12 are formed by punching at one time, or the pole shoe 15 is welded to the inner stator tooth 12, that is, the pole shoe 15 and the inner stator tooth 12 are not detachable.

[0059] Alternatively, as Figure 3 and Figure 5 shown, the pole shoe 15 and the inner stator tooth 12 are detachably connected.

[0060] With reference to Figure 6 and Figure 7 , a plugging groove 120 is provided at one end of the inner stator tooth 12 away from the stator yoke 14, and a plugging tooth 150 is provided on one side of the pole shoe 15 facing the inner stator tooth 12, and the plugging tooth 150 is snap-fitted with the plugging groove 120.

[0061] Specifically, the plugging tooth 150 includes a transition section 152 and a clamping section 153, and the transition section 152 is connected between the clamping section 153 and the pole shoe 15. Among them, the angle between the transition section 152 and the two adjacent side surfaces connected to each other on the pole shoe 15 is greater than or equal to ninety degrees, and the angle between the transition section 152 and the two adjacent side surfaces connected to each other on the clamping section 153 is greater than or equal to ninety degrees, so as to avoid forming an acute angle at the connection between the transition section 152 and the pole shoe 15 and the clamping section 153. Stress concentration areas are usually easy to form at acute angles, and the accuracy of cutting acute angles is not high for the punching process. Therefore, the manufacturing difficulty of the inner stator tooth 12, the pole shoe 15 and the plugging tooth 150 can be relatively reduced, and the yield rate of the inner stator tooth 12, the pole shoe 15 and the plugging tooth 150 can be improved.

[0062] For example, the transition section 152 is a rectangular body, and the clamping section 153 is a trapezoid-like body formed by cutting off two acute angles of a trapezoid. The contour shape of the plugging groove 120 is adapted to the contour shape of the plugging tooth 150, so that the angle between each adjacent side surface of the plugging groove 120 is greater than or equal to ninety degrees, avoiding the formation of a stress concentration area on the plugging groove 120 and reducing the manufacturing difficulty of the plugging groove 120.

[0063] In some embodiments, as Figure 4 shown, the inner stator tooth 12 is a straight tooth, that is, no pole shoe 15 is provided at the free end of the inner stator tooth 12 away from the stator yoke 14, so that the processing technology of the stator core 10 can be simplified and the cost can be reduced. At the same time, it is also beneficial to reduce the winding difficulty on the stator core 10.

[0064] In some embodiments, such as Figures 2 to 5 shown, the stator core 10 may further include a plurality of outer stator teeth 16. The plurality of outer stator teeth 16 are circumferentially spaced apart on the outer side of the stator yoke 14 and extend in a direction away from the central axis of the stator yoke 14. Thus, a heat dissipation channel is formed between adjacent outer stator teeth 16.

[0065] That is, the outer side surface of the stator yoke 14, the outer stator teeth 16, and the supporting surface of the outside for the outer stator teeth 16 jointly enclose to form a heat dissipation channel. Cold air passing through this heat dissipation channel can take away the heat on the stator 100, cool down the stator 100, so as to avoid performance degradation caused by overheating of the stator 100, and is beneficial to improving the power of the motor.

[0066] The positions of the outer stator teeth 16 and the inner stator teeth 12 are arranged in one-to-one correspondence and are at least partially aligned along the circumferential direction of the stator yoke 14. For example, the width of the outer stator teeth 16 along the circumferential direction of the stator yoke 14 is greater than the width of the inner stator teeth 12 along the circumferential direction of the stator yoke 14, or the width of the outer stator teeth 16 along the circumferential direction of the stator yoke 14 is equal to the width of the inner stator teeth 12 along the circumferential direction of the stator yoke 14, or the width of the outer stator teeth 16 along the circumferential direction of the stator yoke 14 is less than the width of the inner stator teeth 12 along the circumferential direction of the stator yoke 14.

[0067] Optionally, the number of the outer stator teeth 16 may be more or less than the number of the inner stator teeth 12. The outer stator teeth 16 are evenly distributed on the outer side of the stator yoke 14, and the positions of the outer stator teeth 16 do not need to correspond to the positions of the inner stator teeth 12 either.

[0068] Next, the winding methods of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 on the stator core 10 will be described.

[0069] The first implementation method

[0070] Generally speaking, as Figure 1 shown, the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 respectively pass through two stator slots 13 separated by one stator slot 13 and are wound around two adjacent inner stator teeth 12. The first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 are sequentially staggered by one inner stator tooth 12 along the circumferential direction of the stator yoke 14.

[0071] For example, the number of the inner stator teeth 12 and the stator slots 13 are six respectively, and the six inner stator teeth 12 and the six stator slots 13 are sequentially numbered. The six inner stator teeth 12 are respectively named tooth 1, tooth 2... tooth 6, and the six stator slots 13 are respectively named slot 1, slot 2... slot 6.

[0072] For example, the first-phase winding 20 passes through Slot 1 and Slot 3 separated by 2 slots, and is wound around Tooth 1 and Tooth 2; the second-phase winding 22 passes through Slot 2 and Slot 4 separated by 3 slots, and is wound around Tooth 2 and Tooth 3; the third-phase winding 24 passes through Slot 3 and Slot 5 separated by 4 slots, and is wound around Tooth 3 and Tooth 4; another first-phase winding 20 passes through Slot 4 and Slot 6 separated by 5 slots, and is wound around Tooth 4 and Tooth 5; another second-phase winding 22 passes through Slot 5 and Slot 1 separated by 6 slots, and is wound around Tooth 5 and Tooth 6; another third-phase winding 24 passes through Slot 6 and Slot 2 separated by 1 slot, and is wound around Tooth 6 and Tooth 1.

[0073] Windings of the same phase are connected in parallel or in series with each other to form a single-phase winding, and the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 are connected in parallel or in series to form a three-phase winding.

[0074] The embodiment of the present application adopts a winding method with a span of 2 slot pitches. Compared with the winding method with a span of 1 slot pitch, the winding factor can be greatly improved, thereby improving the output torque and output power of the motor including the stator 100; and it is defined that the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 are sequentially staggered by one inner stator tooth 12 along the circumferential direction of the stator yoke 14, so that each phase winding fills each stator slot 13 in sequence, which is beneficial to improving the power density and performance of the stator 100.

[0075] For example, the winding factor of a 6-slot 2-pole motor using the tooth-wound and 1-slot pitch winding method is 0.5, while the winding factor of a 6-slot 2-pole motor using the tooth-wound and 2-slot pitch winding method is increased to 0.866, greatly improving the winding factor. Under the same rotational speed conditions, the output torque and output power of the 2-slot pitch motor are both larger.

[0076] The stator slot 13 is also divided into a first-side space 132 and a second-side space 134 along the circumferential direction of the stator yoke 14, and two of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 are respectively arranged in the first-side space 132 and the second-side space 134 of the same stator slot 13.

[0077] As Figure 1 shown, the third-phase winding 24 is arranged in the first-side space 132 of 2 slots, the second-phase winding 22 is arranged in the second-side space 134 of 2 slots, and the first-phase winding 20 straddles 2 slots and passes through the second-side space 134 of 1 slot and the first-side space 132 of 3 slots, and is wound around Tooth 1 and Tooth 2 defining the 2 slots. The winding conditions of the remaining slots are similar and will not be elaborated one by one.

[0078] Furthermore, the cross-sectional areas of the first side space 132 and the second side space 134 perpendicular to the central axis of the stator yoke 14 are equal, and the first side space 132 and the second side space 134 are both filled with corresponding windings, so as to generate a uniform electric field everywhere in the stator core 10, which is beneficial to improving the power density and performance of the stator 100.

[0079] The current directions of any two of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 are opposite in the same stator slot 13.

[0080] As Figure 1 shown, along the direction perpendicular to the central axis of the stator yoke 14, the current direction of the third-phase winding 24 in the first side space 132 of the 2 slot is flowing in, and the current direction of the second-phase winding 22 in the second side space 134 of the 2 slot is flowing out.

[0081] In this embodiment, the number of inner stator teeth 12 and stator slots 13 are six respectively, and the number of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 are two respectively. The two first-phase windings 20, the two second-phase windings 22, and the two third-phase windings 24 are rotationally symmetric by 180 degrees with the central axis of the stator yoke 14 as the rotation center, and the current directions are opposite, thereby ensuring that the electrical angle of the in-phase windings with mirror symmetry is 0 degree, and ensuring that the distribution winding coefficient of this winding structure is 1.

[0082] As Figure 1 shown, the first-phase winding 20 passes through the 1 slot and the 3 slot, and its current flow direction is from the 1 slot to the 3 slot; the other first-phase winding 20 passes through the 4 slot and the 6 slot, and its current flow direction is from the 6 slot to the 4 slot.

[0083] The second implementation manner

[0084] Refer to Figure 8 , the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 respectively pass through two stator slots 13 separated by one stator slot 13 and are wound around two adjacent inner stator teeth 12.

[0085] Among them, the stator slot 13 is radially divided into an inner layer space 131 and an outer layer space 133, and the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 respectively wind from the outer layer space 133 of one stator slot 13 among the two stator slots 13 they pass through to the inner layer space 131 of the other stator slot 13.

[0086] As Figure 8As shown, the first phase winding 20 is wound from the outer space 133 of slot 1 to the inner space 131 of slot 3, and is wound around teeth 1 and 2 across 2 slots; the second phase winding 22 is wound from the outer space 133 of slot 2 to the inner space 131 of slot 4, and is wound around teeth 2 and 3 across 3 slots; the third phase winding 24 is wound from the outer space 133 of slot 3 to the inner space 131 of slot 5, and is wound around teeth 3 and 4 across 4 slots.

[0087] By limiting the first phase winding 20, the second phase winding 22 and the third phase winding 24 to be wound on two adjacent inner stator teeth 12 with a span of 2 slots, compared with a stator in which each phase winding has a span of 1 slot, the stator with a span of 2 slots provided in the present application can increase the winding coefficient. Under the same speed conditions, the torque and power output of the motor with a span of 2 slots are greater; and the stator slot 13 is further divided into an inner space 131 and an outer space 133 along the radial direction of the stator yoke 14, and each phase winding is limited to be wound from the outer space 133 of one stator slot 13 to the inner space 131 of another stator slot 13, so that the radial double-layer winding method can reduce the end overlapping area of each phase winding, thereby reducing the axial length of the stator 100 along the central axis of the stator yoke 14, which can relatively reduce the volume of the stator 100 and improve the power density.

[0088] The cross-sectional areas of the inner space 131 and the outer space 133 perpendicular to the central axis of the stator yoke 14 are equal, and the inner space 131 and the outer space 133 are both filled with windings, so that each winding can generate a uniform electric field at all locations in the stator core 10, which is beneficial to improving the power density and performance of the stator 100.

[0089] The first phase winding 20 , the second phase winding 22 and the third phase winding 24 are staggered one inner stator tooth 12 in sequence along the circumferential direction of the stator yoke 14 , so that each phase winding fills each stator slot 13 , which is beneficial to improving the power density and performance of the stator 100 .

[0090] The current directions of any two of the first phase winding 20 , the second phase winding 22 and the third phase winding 24 in the same stator slot 13 are opposite.

[0091] like Figure 8 As shown, along the direction perpendicular to the central axis of the stator yoke 14, the current direction of the third phase winding 24 in the inner space 131 of the 2 slots is inflow, and the current direction of the second phase winding 22 in the outer space 133 of the 2 slots is outflow.

[0092] The third implementation method

[0093] See also Figure 9 The first phase winding 20 , the second phase winding 22 and the third phase winding 24 are respectively passed through two stator slots 13 separated by one stator slot 13 and are wound on two adjacent inner stator teeth 12 .

[0094] Among them, the stator slot 13 is radially divided into an inner layer space 131 and an outer layer space 133 along the stator yoke 14. Each of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 passes through the inner layer space 131 of the corresponding two stator slots 13, or passes through the outer layer space 133 of the corresponding two stator slots.

[0095] As Figure 9 shown, the first-phase winding 20 (label 202) passes through the outer layer space 133 of slots 2 and 4 and winds around teeth 2 and 3; another first-phase winding 20 (label 201) passes through the inner layer space 131 of slots 5 and 1 and winds around teeth 5 and 6.

[0096] By defining that the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 wind around two adjacent inner stator teeth 12 with a span of 2 slot pitches, compared with a stator in which each phase winding has a span of 1 slot pitch, the stator with a span of 2 slot pitches provided by the present application can increase the winding coefficient. Under the same rotational speed condition, the torque and power output by the motor with a span of 2 slot pitches are greater; and it is defined that each of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 passes through the inner layer space 131 of the corresponding two stator slots 13, or passes through the outer layer space 133 of the corresponding two stator slots, so that the windings do not overlap with each other, thus the axial length of the stator 100 along the central axis of the stator yoke 14 can be reduced, and relatively the volume of the stator 100 can be reduced, thereby improving the power density.

[0097] One of the inner layer space 131 and the outer layer space 133 of each stator slot 13 is passed through by the first-phase winding 20, the second-phase winding 22, or the third-phase winding 24, and the other is in an empty state not passed through by the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24. In other words, one of the inner layer space 131 and the outer layer space 133 of each stator slot 13 is occupied by one or two of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24. The inner layer space 131 and the outer layer space 133 in the empty state are configured as heat dissipation channels to facilitate cooling of the stator 100.

[0098] As Figure 9 shown, the inner layer space 131 of slot 3 is jointly occupied by the second-phase winding 22 (label 221) and the third-phase winding 24 (label 241), the outer space 133 of slot 3 is in an empty state not occupied by any winding, and the first-phase winding 20 (label 202) straddles the outer space 133 of slot 3 and winds around teeth 2 and 3.

[0099] In other embodiments, the inner space 131 and the outer space 133 of each stator slot 13 can be occupied by the first-phase winding 20, the second-phase winding 22, or the third-phase winding 24.

[0100] Furthermore, the first-phase winding 20 includes a first-phase inner winding 201 and a first-phase outer winding 202, the second-phase winding 22 includes a second-phase inner winding 221 and a second-phase outer winding 222, and the third-phase winding 24 includes a third-phase inner winding 241 and a third-phase outer winding 242. The first-phase inner winding 201, the second-phase inner winding 221, and the third-phase inner winding 241 respectively pass through the inner spaces 131 of two corresponding stator slots 13, and the first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 224 respectively pass through the outer spaces 133 of two corresponding stator slots 13.

[0101] The first-phase inner winding 201, the second-phase inner winding 221, and the third-phase inner winding 241 are sequentially staggered by two inner stator teeth 12 along the circumferential direction of the stator yoke 14; the first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 242 are sequentially staggered by two inner stator teeth 12 along the circumferential direction of the stator yoke 14.

[0102] As Figure 9 shown, the first-phase outer winding 202 passes through the outer spaces 133 of slots 2 and 4, the second-phase outer winding 222 passes through the outer spaces 133 of slots 4 and 6, and the third-phase outer winding 224 passes through the outer spaces 133 of slots 6 and 2. The first-phase inner winding 201 passes through the inner spaces 131 of slots 5 and 1, the second-phase inner winding 221 passes through the inner spaces 131 of slots 1 and 3, and the third-phase inner winding 241 passes through the inner spaces 131 of slots 3 and 5.

[0103] The inner space 131 is further divided into a first sub-inner space 131a and a second sub-inner space 131b along the circumferential direction of the stator yoke 14. The first-phase inner winding 201, the second-phase inner winding 221, and the third-phase inner winding 241 respectively pass through the first sub-inner space 131a and the second sub-inner space 131b of two corresponding stator slots 13 that are close to the two inner stator teeth 12 to be wound.

[0104] The outer space 133 is further divided into a first sub-outer space 133a and a second sub-outer space 133b along the circumferential direction of the stator yoke 14. The first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 242 respectively pass through the first sub-outer space 133a and the second sub-outer space 133b of two corresponding stator slots 13 that are close to the two inner stator teeth 12 to be wound.

[0105] The cross-sectional areas of the inner space 131 and the outer space 133 perpendicular to the central axis of the stator yoke 14 are equal, and the cross-sectional areas of the first sub-inner space 131a and the second sub-inner space 131b perpendicular to the central axis of the stator yoke 14 are equal, and the cross-sectional areas of the first sub-outer space 133a and the second sub-outer space 133b perpendicular to the central axis of the stator yoke 14 are equal, and the first sub-inner space 131a, the second sub-inner space 131b, the first sub-outer space 133a and the second sub-outer space 133b passed by the windings are all covered with windings, so that each winding can generate a uniform electric field at various locations of the stator core 10, which is beneficial to improving the power density and performance of the stator 100.

[0106] Combined with reference Figure 9 and Figure 10 The exposed parts of the first phase outer winding 202, the second phase outer winding 222 and the third phase outer winding 242 from the two corresponding stator slots 13 include two radial portions 203 and a circumferential portion 204, wherein the radial portion 203 extends along the radial direction of the stator yoke 14 toward the stator yoke 14, the circumferential portion 204 extends along the circumferential direction of the stator yoke 14, and the circumferential portion 204 connects the two radial portions 203, and the outer space 133 of the stator slot 13 sandwiched between the two radial portions 203 is vacant and configured as a heat dissipation channel.

[0107] In other words, the outer space 133 of the stator slot 13 sandwiched between the two radial portions 203 of the first phase outer winding 202, the second phase outer winding 222 and the third phase outer winding 242 is vacant and configured as a heat dissipation channel 135. Cold air passes through the heat dissipation channel 135 to take away the heat on the stator 100, thereby cooling the stator 100, avoiding overheating of the stator 100 and reducing performance, which is beneficial to improving the output power of the motor including the stator 100.

[0108] In other embodiments, such as Figure 11 As shown, a gap is reserved between the first phase inner winding 201 and the second phase outer winding 222 and the third phase outer winding 242 along the radial direction of the stator yoke 14 , and the gap is configured as a heat dissipation channel 135 .

[0109] like Figure 9 As shown, the inner space 131 of the six slots is not penetrated by any winding, while the outer space 133 of the six slots is penetrated by the second phase outer winding 222 and the third phase outer winding 242, and the first phase inner winding 201 is arranged across the inner space 131 of the six slots, thereby limiting that a gap is reserved between the first phase inner winding 201 and the second phase outer winding 222 and the third phase outer winding 242 along the radial direction of the stator yoke 14, so that cold air can pass through the inner space 131 from the gap to take away the heat on the stator 100, thereby cooling the stator 100.

[0110] Accordingly, a gap is reserved radially along the stator yoke 14 between the second-phase inner winding 221 and the first-phase outer winding 202 and the third-phase outer winding 242, and this gap is configured as a heat dissipation channel 135; a gap is reserved radially along the stator yoke 14 between the third-phase inner winding 241 and the first-phase outer winding 202 and the second-phase outer winding 222, and this gap is configured as a heat dissipation channel 135; a gap is reserved radially along the stator yoke 14 between the first-phase outer winding 202 and the second-phase inner winding 221 and the third-phase inner winding 241, and this gap is configured as a heat dissipation channel 135; a gap is reserved radially along the stator yoke 14 between the second-phase outer winding 222 and the first-phase inner winding 201 and the third-phase inner winding 241, and this gap is configured as a heat dissipation channel 135; a gap is reserved radially along the stator yoke 14 between the third-phase outer winding 242 and the first-phase inner winding 201 and the second-phase inner winding 221, and this gap is configured as a heat dissipation channel 135.

[0111] Alternatively, two of the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 pass through the same inner space 131 or outer space 133, and a gap is provided circumferentially along the stator yoke 14 between the two, and this gap is configured as a heat dissipation channel 135.

[0112] Specifically, as Figure 12 shown, a gap is reserved circumferentially along the stator yoke 14 between the first-phase inner winding 201 and the second-phase inner winding 221 passing through the same inner space 131, a gap is reserved circumferentially along the stator yoke 14 between the second-phase inner winding 221 and the third-phase inner winding 241 passing through the same inner space 131, a gap is reserved circumferentially along the stator yoke 14 between the third-phase inner winding 241 and the first-phase inner winding 201 passing through the same inner space 131, a gap is reserved circumferentially along the stator yoke 14 between the first-phase outer winding 202 and the second-phase outer winding 222 passing through the same outer space 133, a gap is reserved circumferentially along the stator yoke 14 between the second-phase outer winding 222 and the third-phase outer winding 242 passing through the same outer space 133, a gap is reserved circumferentially along the stator yoke 14 between the third-phase outer winding 242 and the first-phase outer winding 202 passing through the same outer space 133, and this gap is configured as a heat dissipation channel 135.

[0113] In some other embodiments, the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 passing through the outer space 133 run along the stator yoke 14 and expose the corresponding outer space 133 they straddle, and the straddled outer space 133 is configured as a heat dissipation channel 135.

[0114] Specifically, as Figure 13As shown, the first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 242 run on the corresponding local stator yoke 14 to avoid the outer space 133 they span, thereby exposing at least part of the outer space 133 they correspondingly span. The spanned outer space 133 is in an empty state, and the spanned outer space 133 is configured as a heat dissipation channel 135.

[0115] In other embodiments, such as Figure 14 As shown, the stator core 10 further includes a plurality of outer stator teeth 16. The plurality of outer stator teeth 16 are circumferentially spaced on the outer side of the stator yoke 14 and extend in a direction away from the central axis of the stator yoke 14. Thus, a heat dissipation channel 135 is formed between adjacent outer stator teeth 16.

[0116] Further, the first-phase winding 20, the second-phase winding 22, and the third-phase winding 24 passing through the outer space 133 run within the range from the inner side of the stator yoke 14 to the outer side of the outer stator teeth 16 away from the central axis of the stator yoke 14, and expose the outer space 133 they correspondingly span. The spanned outer space 133 is in an empty state, and the spanned outer space 133 is configured as a heat dissipation channel 135.

[0117] Specifically, as Figure 15 shown, the first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 242 can run on the stator yoke 14, or run on the stator yoke 14 and the outer stator teeth 16 within the range defined from the inner side of the stator yoke 14 to the outer side of the outer stator teeth 16 away from the central axis of the stator yoke 14, to expose the outer space 133 they correspondingly span. The spanned outer space 133 is in an empty state, and the space between adjacent outer stator teeth 16 is not completely blocked by the wiring of each phase winding. Therefore, the outer space 133 in the empty state and the unblocked part between adjacent outer stator teeth 16 can be configured as a heat dissipation channel 135.

[0118] In some embodiments, referring to Figure 5 and Figure 9 , the stator yoke 14 includes a plurality of sub-stator yokes 140 spliced in sequence. At least two inner stator teeth 12 are provided on each sub-stator yoke 140. The two inner stator teeth 12 around which the first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 242 are wound are located on the same sub-stator yoke 140, and the two inner stator teeth 12 around which the first-phase inner winding 201, the second-phase inner winding 221, and the third-phase inner winding 241 are wound are located on two adjacent sub-stator yokes 140.

[0119] Thus, on a sub-stator yoke 140, the first-phase outer winding 202, the second-phase outer winding 222, or the third-phase outer winding 242 can be wound first, and then multiple sub-stator yokes 140 are spliced together to form the stator core 10. After the splicing is completed, the first-phase inner winding 201, the second-phase inner winding 221, and the third-phase inner winding 241 are wound. Therefore, the winding difficulty of the first-phase outer winding 202, the second-phase outer winding 222, and the third-phase outer winding 242 can be reduced, making the winding structure of each phase winding easy to assemble with the stator 10. At the same time, it is beneficial to carry out mechanized winding, improving the manufacturing efficiency of the stator 100.

[0120] Based on this, the present application further provides a motor 300. Referring to Figure 16 , the motor 300 includes a rotor 200 and the stator 100 as described above, and the rotor 200 is disposed inside the stator 100.

[0121] Different from the prior art, the present application discloses a stator and a motor. The stator provided by the present application adopts a winding method with a span of 2 slot pitches. Compared with the winding method with a span of 1 slot pitch, the stator with a span of 2 slot pitches can greatly improve the winding coefficient, thereby improving the output torque and output power of the motor including the stator. Further, it is defined that each of the first-phase winding, the second-phase winding, and the third-phase winding passes through the inner space of the two corresponding stator slots or the outer space of the two corresponding stator slots, so that the windings do not overlap each other. Therefore, the axial length of the stator along the central axis of the stator yoke can be reduced, and relatively, the volume of the stator can be reduced, thereby improving the power density and further improving the output torque and output power of the motor including the stator.

[0122] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A stator, characterized in that, include: A stator core, comprising a plurality of inner stator teeth and a stator yoke arranged in an annular shape, wherein the plurality of inner stator teeth are arranged at intervals along the circumferential direction of the stator yoke on the inner side of the stator yoke and extend toward the central axis of the stator yoke, thereby forming stator slots between adjacent inner stator teeth; The first phase winding, the second phase winding and the third phase winding are respectively wound on two adjacent inner stator teeth through two stator slots separated by one stator slot; The stator slot is divided into an inner space and an outer space along the radial direction of the stator yoke, and each of the first phase winding, the second phase winding and the third phase winding passes through the inner space of the two corresponding stator slots, or passes through the outer space of the two corresponding stator slots; One of the inner space and the outer space of each of the stator slots is penetrated by the first phase winding, the second phase winding or the third phase winding, and the other is in an empty state where the first phase winding, the second phase winding and the third phase winding are not penetrated; Wherein, the stator core further comprises a plurality of outer stator teeth, and the plurality of outer stator teeth are arranged at intervals on the outer side of the stator yoke; Among them, the first phase winding, the second phase winding and the third phase winding passing through the outer space are routed from the inner side of the stator yoke to the outer side of the outer stator tooth away from the central axis of the stator yoke, and expose at least a part of the outer space corresponding to them, and the outer space spanned is configured as a heat dissipation channel.

2. The stator according to claim 1, characterized in that, The first phase winding includes a first phase inner winding and a first phase outer winding, the second phase winding includes a second phase inner winding and a second phase outer winding, and the third phase winding includes a third phase inner winding and a third phase outer winding, wherein the first phase inner winding, the second phase inner winding and the third phase inner winding are respectively passed through the inner spaces of the two corresponding stator slots, and the first phase outer winding, the second phase outer winding and the third phase outer winding are respectively passed through the outer spaces of the two corresponding stator slots.

3. The stator according to claim 2, characterized in that The first phase inner winding, the second phase inner winding and the third phase inner winding are staggered in sequence by two of the inner stator teeth along the circumferential direction of the stator yoke; the first phase outer winding, the second phase outer winding and the third phase outer winding are staggered in sequence by two of the inner stator teeth along the circumferential direction of the stator yoke.

4. The stator according to claim 2, wherein, The inner space is divided into a first sub-inner space and a second sub-inner space along the circumferential direction of the stator yoke, and the first-phase inner winding, the second-phase inner winding and the third-phase inner winding are respectively arranged in the first sub-inner space and the second sub-inner space close to the two inner stator teeth wound in the two corresponding stator slots; The outer space is divided into a first sub-outer space and a second sub-outer space along the circumferential direction of the stator yoke. The first-phase outer winding, the second-phase outer winding and the third-phase outer winding are respectively arranged in the first sub-outer space and the second sub-outer space close to the two inner stator teeth wound in the two corresponding stator slots.

5. The stator according to claim 2, characterized in that, The stator yoke includes a plurality of sub-stator yokes spliced in sequence. At least two of the inner stator teeth are provided on each sub-stator yoke. The two inner stator teeth around which the first-phase outer winding, the second-phase outer winding, and the third-phase outer winding are wound are located on the same sub-stator yoke. The two inner stator teeth around which the first-phase inner winding, the second-phase inner winding, and the third-phase inner winding are wound are located on two adjacent sub-stator yokes.

6. The stator according to claim 2, characterized in that, A gap is reserved radially along the stator yoke between the first-phase inner winding and the second-phase outer winding and the third-phase outer winding. A gap is reserved radially along the stator yoke between the second-phase inner winding and the first-phase outer winding and the third-phase outer winding. A gap is reserved radially along the stator yoke between the third-phase inner winding and the first-phase outer winding and the second-phase outer winding.

7. The stator according to claim 1, characterized in that, Two of the first-phase winding, the second-phase winding, and the third-phase winding pass through the same inner space or outer space, and a gap is reserved circumferentially along the stator yoke between the two.

8. The stator according to claim 1, characterized in that, The portions of the first-phase winding, the second-phase winding, and the third-phase winding exposed from the outer spaces of the two stator slots through which they pass respectively include two radial portions and one circumferential portion. The radial portions extend towards the stator yoke radially along the stator yoke, and the circumferential portion extends circumferentially along the stator yoke and connects the two radial portions.

9. The stator according to claim 1, characterized in that, The stator core further includes pole shoes, and the pole shoes are connected to the free ends of the inner stator teeth away from the stator yoke.

10. The stator according to claim 9, characterized in that, The pole shoes and the inner stator teeth are of an integral structure, or the pole shoes and the inner stator teeth are detachably connected.

11. The stator according to claim 10, characterized in that, A plug-in groove is provided at one end of the inner stator tooth away from the stator yoke, and a plug-in tooth is provided on the side of the pole shoe facing the inner stator tooth. The plug-in tooth is engaged with the plug-in groove.

12. The stator according to claim 1, characterized in that, The number of the inner stator teeth and the stator slots is six respectively. The number of the first-phase winding, the second-phase winding, and the third-phase winding is two respectively. The two first-phase windings, the two second-phase windings, and the two third-phase windings rotate 180 degrees with the central axis of the stator yoke as the rotation center, and the current directions are opposite.

13. A motor, characterized in that, The motor includes a rotor and the stator according to any one of claims 1 to 12, and the rotor is arranged inside the stator.

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