Stator winding structure and motor with same

Abstract

A stator winding structure includes: a yoke having a yoke body designed to be annular and having a thickness, the yoke body having a plurality of inner and outer tooth grooves formed on the inner and outer sides of the yoke body in the radial direction by means of inner and outer teeth, respectively; a stator lamination accommodated within the yoke body; a plurality of winding coils, each winding coil wound on the yoke body, in which an active edge of each winding coil is received in the inner and outer tooth slots, and an end winding extends across a width of the yoke body so as to connect the active edge in the inner tooth slot and the active edge in the outer tooth slot. According to the stator winding structure, the length of the end winding of the winding coil in the axial direction can be shortened, the copper loss is reduced, and the structural size design of the stator winding is more compact. The utility model further provides a motor with the stator winding structure.

Description

Technical Field

[0001] The present application relates to the field of electric motors, in particular high-voltage and high-speed electric motors. Specifically, the present application relates to a stator winding structure for an electric motor. The present application also proposes an electric motor having the stator winding structure. Background Art

[0002] Currently, stators for high-speed compressor motors on the market generally have distributed windings.

[0003] Figure 1 、 Figure 2 Schematically illustrates such a distributed winding 1000, which is used, for example, for a three-phase motor. Figure 1 As can be seen in the figure, the distributed winding 1000 is generally constructed in a substantially cylindrical shape. The distributed winding 1000 includes a stator core 1300 and winding coils 1100 wound around stator slots 1310 in the stator core 1300. The roughly cylindrical distributed winding 1000 has a first end E1010 and a second end E1020 formed on either side of the stator core 1300 in the axial direction. At the first and second ends E1010 and E1020, the enameled wire of each phase winding coil 1100 needs to span a relatively long distance. This results in a relatively large amount of enameled wire at the two ends E1010 and E1020, resulting in high copper losses. The structure and winding method of the stator core 1300 of the distributed winding 1000 make it impossible to reduce the amount of enameled wire used.

[0004] These enameled wires with longer spans also result in the length of the distributed winding 1000 at the two ends E1010 and E1020 in the axial direction being unable to be shortened, thus occupying a larger space. This also makes the axial dimension of the motor using the distributed winding 1000 larger, which is not conducive to the compact design of the motor.

[0005] Furthermore, the stator windings also require heat dissipation. In existing motors, to dissipate heat from the distributed windings 1000, a separate water jacket or spiral cooling channels are typically provided within the motor housing, through which liquid cooling water flows. The cooling water then exchanges heat with the distributed windings 1000 using air as a medium, dissipating heat from the distributed windings 1000, particularly at their ends E1010 and E1020, through thermal radiation. The need to separately fabricate the water jacket or cooling channels results in higher manufacturing costs and material consumption for the motor components. Furthermore, since the water in the water jacket or cooling channels cools the distributed windings 1000, particularly at their ends E1010 and E1020, through thermal radiation, it has been found that this cooling efficiency is relatively low. This may not fully meet the heat dissipation requirements of motors operating at higher speeds, in particular.

[0006] Therefore, it is still desired in the art to propose a new winding design for a stator of an electric motor, which can reduce copper loss and / or reduce the volume of the winding, especially the end volume. Utility Model Content

[0007] The present application is completed in view of the above-mentioned technical problems, and its purpose is to propose a stator winding structure for the stator of an electric motor, which can reduce the length of the end winding in the stator winding, thereby reducing the amount of enameled wire consumed in the end winding part, and thus reducing the copper loss generated at the end winding on the one hand, and shortening the axial dimension of the stator winding structure on the other hand.

[0008] According to the stator winding structure of the present application, it includes: a yoke, the yoke body of the yoke is designed and constructed as a circular ring with a thickness, a plurality of internal tooth slots are formed on the radial inner side of the yoke body by means of a plurality of internal teeth, and a plurality of external tooth slots are formed on the radial outer side of the yoke body; a stator lamination, the stator lamination is accommodated in the yoke; a plurality of winding coils, each of the winding coils is wound on the yoke body, wherein the effective side of each winding coil is accommodated in the inner tooth slot and the outer tooth slot, and the end winding of each winding coil extends across the width of the yoke body to connect the effective side of the winding coil in the inner tooth slot and the effective side of the winding coil in the outer tooth slot.

[0009] In the context of the present application, unless otherwise specified, the longitudinal direction or axial direction refers to the direction along which the thickness of the annular yoke body extends, ie, the direction along which the cores in the stator laminations are stacked.

[0010] In the stator winding structure of the present application, the yoke provides structural support for the coil windings and stator laminations, as well as housing space and insulation performance for the stator laminations. By wrapping the winding coils around the annular yoke body of the yoke and maintaining the effective edges of the winding coils on slots disposed radially inward and outward of the yoke body, the end windings of the winding coils connecting the effective edges only need to span the width of the yoke body at the end surfaces of the yoke, i.e., at the surfaces of the yoke body orthogonal to the axial direction.

[0011] As a result, the stator winding structure of the present application shortens the axial length of the end windings in the winding coil, thereby reducing the amount of enameled wire used in the end windings and the resulting copper losses. Furthermore, the stator winding structure of the present application advantageously reduces the axial length of the entire stator winding structure, thereby reducing the overall length of the motor incorporating the stator winding structure of the present application, achieving a more compact motor design.

[0012] Furthermore, in the stator winding structure of the present application, air passages can be created in the inner slots, for example, between the winding coils housed therein, and in the outer slots, for example, between the outer slots and the outer housing housing the stator winding structure. This configuration enables the use of a gaseous refrigerant to cool the stator winding structure, improving cooling efficiency.

[0013] In a non-limiting embodiment of the present application, the external teeth in the stator winding structure are formed to extend radially outward from the outer peripheral surface of the yoke body away from the yoke body, and the external tooth slots are formed between adjacent external teeth.

[0014] Here, the external teeth divide and space adjacent external slots. When winding coils onto the yoke body to form the winding coils, the external teeth position the coils, retaining the corresponding winding coil portions within their corresponding external slots. The external teeth also further increase the magnetic conductivity of the stator winding structure.

[0015] Furthermore, during the process of installing the stator winding structure into the main structure of an applied motor, the external teeth can also form an interference fit with the outer housing of the motor. Optionally, the external teeth and the yoke body are manufactured integrally, for example, by molding or additive manufacturing, to improve the manufacturing efficiency of the stator winding structure.

[0016] In a non-limiting preferred embodiment of the present invention, the external teeth extend beyond the end surface of the yoke body in the axial direction of the stator winding structure, forming a spanning portion of the external teeth. When winding coil portions of the same phase are wound between adjacent tooth slots, the spanning portion of the external teeth can provide support for the enameled wire extending across the external teeth.

[0017] Preferably, the spanning portion is connected to the yoke body of the yoke via a support portion. More preferably, the support portion is integrally formed with the spanning portion and the yoke body. The support portion provides support for the spanning portion and further provides support for the enameled wire that spans the outer teeth via the spanning portion.

[0018] Further, in the stator winding structure of the present application, the plurality of internal teeth extend radially inward from the inner circumferential surface of the yoke body away from the yoke body, and the internal tooth slots are formed between adjacent internal teeth.

[0019] Similar to the external teeth, the internal teeth divide and space adjacent internal slots, thereby limiting the effective sides of the coils in the internal slots during the process of winding the coils on the yoke body to form winding coils.

[0020] Furthermore, by separating the inner and outer peripheral spaces of the annular yoke by the inner and outer tooth slots and arranging the winding coils accordingly, stator winding with the required number of phases can be achieved, and the arrangement of the inner and outer teeth also increases the magnetic conductive area.

[0021] Preferably, the internal teeth at the yoke body are composed of a vertical portion and a transverse portion to form a roughly "T" shape, wherein the vertical portion extends radially inward from the inner circumferential surface of the annular yoke body and has an end, and the transverse portion intersects with the vertical portion at the end and has a first internal tooth tip and a second internal tooth tip.

[0022] Here, the vertical portion of the internal tooth serves as a partition wall between adjacent internal tooth gaps.

[0023] Preferably, for each inner tooth of the stator winding structure of the present application, there is an outer tooth in the same radial direction and in the opposite extension direction, that is, the inner teeth and outer teeth on both sides of the yoke body appear in pairs, and each pair of inner and outer teeth is on the same straight line. Such an arrangement makes it possible for the inner tooth slots and outer tooth slots defined by two adjacent groups of inner and outer teeth to have almost no offset relative to each other in the circumferential direction. Furthermore, the end windings for connecting the effective sides of the winding coils held in such inner and outer tooth slots only need to span the width of the yoke body to connect the two effective sides. This further shortens the extension distance of the end windings, thereby minimizing the length of the end windings and the copper loss generated by the end windings.

[0024] The winding structure of the present application may further include an insulating member disposed between adjacent, out-of-phase winding coil sections within the winding coil. The provision of the insulating member provides electrical insulation between adjacent, out-of-phase winding coil sections, thereby improving the electrical safety and reliability of the stator winding structure.

[0025] Optionally, the above-mentioned insulating member is, for example, insulating paper or an insulating frame portion. The insulating paper can be wrapped around the winding coil portions of different phases to achieve electrical isolation and insulation between the winding coils of different phases. The insulating frame is usually made of plastic. When the annular yoke is made of such insulating material to form an insulating frame, such an insulating portion can be further provided on the insulating frame. For example, the insulating member is designed to be a separating rib extending radially outward from the outer peripheral surface of the yoke body and formed integrally with the yoke body, which is used to separate the winding coil portions of different phases in the same tooth slot.

[0026] The arrangement of these two types of insulating members is relatively simple, thereby simplifying the manufacturing process of the stator winding structure of the present application. Furthermore, when the insulating member is removable, for example, when the insulating member is provided as insulating paper, the insulating member can be installed as needed after the winding coil is completed, making the manufacture and use of the annular yoke more flexible.

[0027] The present application also proposes a motor, which includes a stator, a rotor and a motor housing, wherein the stator has a stator winding structure as described in any of the above schemes, and wherein the motor does not have a cooling water jacket, and the motor housing does not have a cooling water channel for guiding cooling water to flow therethrough.

[0028] By using the stator winding structure described in any of the above solutions in the motor, the motor of the present application can reduce its longitudinal dimension accordingly due to the reduced longitudinal dimension of the stator, thereby making the design of the motor more compact.

[0029] Furthermore, due to the reduced copper losses in the stator winding structure, the motor achieves higher efficiency. Furthermore, because the stator winding structure provides channels for gas flow, stator cooling can be achieved using, for example, a gaseous refrigerant. This eliminates the need for a separate water jacket or separate cooling channels in the motor housing. This simplifies the manufacturing process for the motor's components, reduces component costs, and ultimately helps control the overall cost of the motor.

[0030] In one embodiment of the present application, the stator yoke is interference-fitted with the motor housing. Since a water jacket is no longer required, the stator can be installed directly by interference-fitting the yoke with the motor housing. This simplifies the motor assembly process.

[0031] Optionally, the motor of the present application uses a gas-liquid mixed refrigerant to cool the stator. Because the stator winding structure used creates channels for air flow, the use of such a mixed refrigerant can fully utilize these channels to achieve heat exchange through contact between the refrigerant and the stator winding structure, thereby cooling the stator and improving the cooling efficiency of the motor. In particular, the use of such a gas-liquid mixed refrigerant can provide additional cooling effect through the conversion of a small amount of liquid mixture contained therein to a gas mixture.

[0032] Preferably, the motor according to the present application is a high-speed compressor motor. By using the above-mentioned stator winding structure, the stator can be effectively cooled, and the motor can have a higher energy density, which can especially meet the performance and cooling requirements of high-speed compressor motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] With reference to the above objects, the technical features of the present invention are clearly described in the following claims, and its advantages are apparent from the following detailed description with reference to the accompanying drawings, which show preferred embodiments of the present invention by way of example without limiting the scope of the concept of the present invention.

[0034] Figure 1A perspective view of a distributed winding structure in the prior art is shown;

[0035] Figure 2 Shown Figure 1 A schematic diagram of a transverse cross-section of a distributed winding structure shown;

[0036] Figure 3 shows a three-dimensional view of a stator winding structure according to the present utility model;

[0037] Figure 4 Shown Figure 3 A schematic diagram of a transverse cross section of the stator winding structure shown along line BB;

[0038] Figure 5 Shown from Figure 4 A perspective view of the stator winding structure viewed in transverse section is shown;

[0039] Figure 6 Shown in a three-dimensional diagram Figure 3 The stator winding structure shown, wherein no winding coils are wound; and

[0040] Figure 7 Shown in plan view Figure 3 The stator winding structure shown does not have winding coils wound around it.

[0041] List of reference numerals:

[0042] 10 Toroidal winding;

[0043] 100 yoke;

[0044] 101 Yoke body;

[0045] 102 internal teeth;

[0046] 1021 longitudinal section;

[0047] 1022 transverse section;

[0048] 1023 first inner tooth tip;

[0049] 1024 second inner tooth tip;

[0050] 103 external teeth;

[0051] 103-1 first external tooth;

[0052] 103-2 second outer tooth;

[0053] 1031 reinforcement;

[0054] 1032 Crossover Department;

[0055] 104 internal tooth groove;

[0056] 104-1 first internal tooth groove;

[0057] 104-2 Second internal tooth groove;

[0058] 104-3 third inner tooth groove;

[0059] 105 external tooth groove;

[0060] 105-1 first external tooth groove;

[0061] 105-2 Second external tooth groove;

[0062] 105-3 third outer tooth groove;

[0063] 106 separator ribs;

[0064] 200 winding coils;

[0065] 210 first winding coil portion;

[0066] 220 second winding coil portion;

[0067] 230 third winding coil section;

[0068] 240 fourth winding coil section;

[0069] 250 fifth winding coil section;

[0070] D is the width of the yoke body;

[0071] E201 first end (of the toroidal winding);

[0072] E202 second end portion (of the toroidal winding);

[0073] 300 stator laminations;

[0074] 1000 (Prior Art) Distributed Winding;

[0075] E1010 Ends (of distributed windings);

[0076] E1020 Ends (of distributed windings);

[0077] 1100 Coil winding;

[0078] 1300 stator core;

[0079] 1310 stator slots. DETAILED DESCRIPTION

[0080] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms, and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims. For ease of explanation and precise definition in the appended claims, the terms "upper," "lower," "inner," and "outer" are used to describe the features of the exemplary embodiments shown in the drawings with reference to their positions.

[0081] Toroidal winding can be used as the stator winding for electric motors. It is particularly suitable for high-speed compressors and compact motors. Toroidal winding is formed by winding coils around an annular yoke, between the slots formed by the yoke's inner and outer teeth. The coils are mechanically supported by an insulating frame, and, if necessary, electrical insulation is provided between coils of different phases using additional insulation. In toroidal winding, the active sides (straight portions) of the coils are accommodated in the inner and outer slots of the yoke, while the end windings, connecting the active sides located in the slots on both sides, extend across the width of the annular yoke.

[0082] First, combine Figures 3 to 5 The toroidal winding 10 is generally explained. Figure 3 As shown, the annular winding 10 includes a yoke 100 and a plurality of winding coils 200 wound on the yoke 100. The stator laminations 300 of the stator are accommodated inside the yoke 100. The annular winding 10 has an axial direction, that is, Figure 5 The axis A in FIG. extends in the direction along which the stator laminations 300 are also stacked.

[0083] In the illustrated embodiment, the annular winding 10 is configured as a three-phase winding. The yoke 100 of the annular winding 10 is designed to be substantially annular and has a thickness for supporting the winding coil 200 and providing mechanical strength for the stator laminations 300 (also referred to as the "core") housed therein. In the illustrated embodiment, the yoke body 101 of the annular yoke 100 is made of plastic to form an insulating skeleton. The plastic material forming the yoke body 101 has a thickness to form a hollow interior space for accommodating the stator laminations 300 therein, particularly as Figure 4 、 Figure 5 Visible in.

[0084] Yoke 100 has internal teeth 102 and external teeth 103 integrally formed with yoke body 101. Internal teeth 102 extend radially inward from the inner circumference of yoke body 101, i.e., toward the center of the circular shape, but do not intersect with each other. External teeth 103 extend radially outward from the outer circumference of yoke body 101, i.e., away from the center of the circular shape.

[0085] Internal slots 104 are formed between adjacent internal teeth 102. External slots 105 are formed between adjacent external teeth 103. In the illustrated embodiment, a total of twelve internal slots 104 and twelve external slots 105 are formed in the yoke 100. The respective phase coils of the winding coil 200 of the annular winding 10 are accommodated in corresponding internal and external slots according to the requirements of the generated magnetic field.

[0086] like Figure 4 、 6 As can be seen in Figures 7 and 8, the internal teeth 102 are designed and constructed in a generally T-shape when viewed in a cross-section transverse to the annular winding 10. This generally T-shaped internal tooth 102 comprises a longitudinal portion 1021 extending radially inward from the inner circumferential surface of the yoke body 101, and a transverse portion 1022 extending orthogonally thereto at the end of the longitudinal portion 1021. The ends of the transverse portion 1022 form a first internal tooth tip 1023 and a second internal tooth tip 1024, respectively. The longitudinal portion 1021 thus forms a spacer between adjacent internal tooth slots 104, while the two internal tooth tips 1023 and 1024 of the transverse portion 1022 increase the magnetic conduction area.

[0087] External teeth 103 such as Figure 3 、 4 As can be seen in FIG, the stator laminations 300 protrude radially outward from the outer peripheral surface of the yoke body 101 and are configured to be hollow, and the stator laminations 300 may protrude from the ends of the outer teeth 103. Figure 6 、 7 As can be seen in the figure, the external teeth 103 extend beyond the end surface of the yoke body 101 on one side in the axial direction of the annular winding 10, forming a spanning portion 1032. The spanning portion 1032 does not have an opening through which the stator laminations 300 protrude, and a reinforcing rib 1031 is provided on one side of the spanning portion 1032. The reinforcing rib 1031 is fixedly connected between the spanning portion 1032 and the end surface of the yoke body 101 to support the spanning portion 1032.

[0088] Furthermore, the external teeth 103 disposed on the outer circumferential surface of the yoke body 101 form spacers that facilitate confining each phase winding coil within its corresponding outer tooth slot 105. To achieve better spacing, the external teeth 103 can have a relatively high height, namely, the distance between their tops and the outer circumferential surface of the yoke body 101. The height of the external teeth 103 is preferably set to be sufficient to limit the position of each winding coil 200 wound in the outer tooth slot 105, preventing the coil in the first outer tooth slot 105-1 from wandering into the adjacent second outer tooth slot 105-2, as further explained below. The provision of the external teeth 103 also increases the magnetic conductive area.

[0089] It should be noted that the lengths of the inner teeth 102 and outer teeth 103 in the perspective view are schematic and not necessarily drawn to scale. In actual design, the absolute lengths and relative lengths of the inner teeth 102 and outer teeth 103 are designed based on the winding requirements. For example, the outer teeth 103 may be longer than shown.

[0090] In other embodiments not shown, according to the specific design requirements of the motor performance, in the yoke 100 of the annular winding 10, more or fewer inner tooth slots 104 and outer tooth slots 105 can be set by adjusting the distribution of the inner teeth 102 and the outer teeth 103 to meet the design requirements of the motor performance, such as achieving a higher speed and greater torque of the motor, etc., as long as the corresponding requirements of uniform distribution of the winding phase are met.

[0091] Furthermore, in the embodiment shown, a separation rib 106 is provided on the outer peripheral surface of the yoke body 101. Figure 6 . Separating ribs 106 are provided as needed in the outer slots 105 of the yoke 100, specifically in the outer slots 105 that accommodate winding coils of different phases, to electrically insulate the two winding coils of different phases that have a potential difference. Separating ribs 106 can be integrally formed with the yoke body 101 and thus also be made of a material such as plastic.

[0092] Next, refer to Figures 3 to 5 , explaining the winding method of the winding coil 200.

[0093] exist Figure 3 and Figure 5 In the example, winding coils of the same color have the same phase. Figure 5For example, the first to fourth winding coil sections 210, 220, 230, 240, and 250 are windings of the first phase, while the fifth winding coil section 250 is a winding of the second phase, which is a winding of a different phase than the first to fourth winding coil sections 210 to 240. Therefore, there is no potential difference between the first to fourth winding coil sections 210 to 240, while there is a potential difference between the fifth winding coil section 250 and the fourth winding coil section 240 of a different phase. Therefore, no electrical insulating member is required between the second winding coil section 220 and the third winding coil section 230 wound in the first outer tooth slot 105-1, while an electrical insulating member is required between the effective sides of the second winding coil section 220 and the third winding coil section 230 in the first inner tooth slot 104-1. Figure 4 、 Figure 5 A gap is formed as shown. A potential difference exists between the fourth winding coil portion 240 and the fifth winding coil portion 250 wound in the second outer slot 105-2, so an insulating member is required to achieve electrical insulation between them. In the illustrated embodiment, this is achieved using a separating rib 106 formed in the second outer slot 105-2.

[0094] When winding the toroidal winding 10 on the yoke 100, taking the winding coil of the first phase as an example, the winding is started from the first winding coil portion 210, and is wound from the first outer tooth slot 105-1 across the end surface of the yoke body 101 to the first inner tooth slot 104-1. In other words, when winding the enameled wire to form the first winding coil portion 210, at the two ends E201 and the opposite end E102 of the toroidal winding 10, the enameled wire only needs to span the width D of the yoke body 101 (see FIG. 2 ). Figure 7 ). This significantly shortens the end winding length of the toroidal winding 10 at the ends E201 and E202.

[0095] After completing the winding of the first winding coil portion 210, the last turn of the enameled wire returns to the first outer tooth slot 105-1. The enameled wire is then extended circumferentially toward the span 1032 of the first outer tooth 103-1. The enameled wire then circumferentially crosses the first outer tooth 103-1 over the span 1032 and reaches the second outer tooth slot 105-2 circumferentially adjacent to the first outer tooth slot 105-1. In the second outer tooth slot 105-2, the enameled wire is again wound across the width D of the yoke body 101 toward the second inner tooth slot 104-2, thereby forming the second winding coil portion 220 in the same phase as the first winding coil portion 210.

[0096] After the winding of the second winding coil section 220 is completed, the third winding coil section 230 of the same phase is similarly wound in the second outer tooth slot 105-2. When the winding of the third winding coil section 230 is about to be completed, similar to the first winding coil section 210, the last turn of the enameled wire returns to the second outer tooth slot 105-2.

[0097] Next, the enameled wire is extended along the circumferential direction of the ring toward the spanning portion 1032 of the second outer tooth 103-2 on one side of the second outer tooth slot 105-2, and crosses the second outer tooth 103-2 over the spanning portion 1032 of the second outer tooth 103-2 along the circumferential direction to reach the third outer tooth slot 105-3 adjacent to the second outer tooth slot 105-2 in the circumferential direction, and the enameled wire is again wound across the width D of the yoke body 101 toward the third inner tooth slot 104-3 to form a fourth winding coil portion 240 of the same phase.

[0098] After the winding of the fourth winding coil portion 240 is completed, the winding of the four winding coil portions of this phase is completed, and the ends of the enameled wires are led out in a manner known to those skilled in the art and will not be described again here.

[0099] Next, winding of the fifth winding coil portion 250, which is out of phase with the first to fourth winding coil portions 210 to 240, begins in the third outer tooth slot 105-3. Since the fourth winding coil portion 240 and the fifth winding coil portion 250 are out of phase with each other and thus have a potential difference, the winding of the fifth winding coil portion 250 must begin on the other side of the separating rib 106, which serves as an electrical insulator.

[0100] The winding method of the fifth winding coil portion 250 is the same as that described above for the first winding coil portion 210 , and will not be repeated here.

[0101] The above winding method is repeated to complete the preparation of all winding coils 200 in the annular winding 10 .

[0102] As explained above, since each winding coil only needs to span the width D of the yoke body 101 at the end, the length of the end winding is significantly shortened, thereby reducing the length of the enameled wire used in the end winding, thereby reducing copper losses and improving the efficiency of the motor using the toroidal winding 10 as the stator structure. Furthermore, the shortened end winding length of the toroidal winding 10 also reduces the overall longitudinal or lengthwise dimension of the toroidal winding 10, making the structure more compact. This helps reduce the axial dimension of the motor using the toroidal winding 10, which is particularly beneficial for compact motor designs.

[0103] Calculations have verified that the toroidal winding 10 has the same winding coefficient as the existing distributed winding 1000 mentioned at the beginning of this article. Specifically, the winding coefficient of the toroidal winding 10 can also reach 0.96, so that the motor using the toroidal winding 10 and the motor using the distributed winding 1000 have the same motor performance.

[0104] In the illustrated embodiment, a set of radially adjacent inner teeth 102 and outer teeth 103 of the yoke 100 extend substantially on the same straight line.

[0105] In the yoke 100 , the provision of the inner tooth slots 104 and the outer tooth slots 105 also increases the contact area with the refrigerant for cooling the annular winding 10 , thereby achieving better cooling of the annular winding 10 .

[0106] Specifically, the external teeth 103 provided on the outer circumferential surface of the yoke body 101 can be used to create an interference fit during assembly with the motor housing (not shown). This motor eliminates the need for a cooling water jacket or separate cooling channels in the motor housing. Instead, the annular winding 10 is cooled using a gas-liquid mixed refrigerant. The liquid portion of the refrigerant rapidly vaporizes after being released into the motor housing, allowing the gaseous refrigerant to flow axially from the inside and outside of the annular yoke body 101 through the annular winding 10, thereby cooling the annular winding 10.

[0107] It has been found that such cooling is more effective for the annular winding 10. In particular, due to the arrangement of the inner slots 104 and the outer slots 105 in the annular yoke 100, the gaseous refrigerant can flow directly through the gaps between adjacent winding coils 200 in the inner slots 104, thereby cooling the effective edges of the winding coils 200 in the inner slots 104. Similarly, the gaseous refrigerant can flow directly through the gaps between the outer slots 105 and the inner circumference of the motor housing, directly contacting the winding coils 200 in the outer slots 105 without the need for air as an intermediate medium for indirect heat exchange with the stator winding. Furthermore, the outer teeth 103 can also come into direct contact with the gaseous refrigerant, which improves cooling efficiency and enables the motor using the annular winding 10 to have a higher power density.

[0108] The above configuration improves the cooling efficiency of the winding coils 200 in the annular winding 10. Specifically, this design of the annular winding 10 provides a larger contact area between the stator laminations and the gas-liquid refrigerant mixture, thereby enhancing the cooling effect. This makes the annular winding 10 particularly suitable for high-speed compressor motors with high cooling requirements.

[0109] Furthermore, since the motor using the toroidal winding 10 can be cooled using the aforementioned gas-liquid mixed refrigerant, there is no need to provide a dedicated cooling water jacket or machine dedicated water cooling channels in the motor housing. This reduces the manufacturing cost of the motor components and simplifies the manufacturing process, helping to lower the overall manufacturing cost of the motor.

[0110] During manufacturing of the yoke 100, the yoke 100 may be constructed as a first yoke portion and a second yoke portion, depending on the size of the yoke 100. The first yoke portion and the second yoke portion may be connected to each other by form fit. The first yoke portion and the second yoke portion may be two equally divided portions along the axial direction.

[0111] Experiments have shown that the winding coils 200 of the annular winding 10 can be realized by an automatic winding machine, and its realization process ensures the full slot rate of each inner tooth slot 104, preferably a full slot rate of at least 60%, and the winding coils 200 in each inner tooth slot 104 and outer tooth slot 105 are arranged neatly, so that the magnetic field generated by the annular winding 10 after power is turned on is uniform.

[0112] In the exemplary embodiment shown, the toroidal winding 10 is designed for a three-phase motor, so Figure 3 and Figure 5 The embodiment shown in FIG. 1 uses three different colors to represent winding coils of different phases. In other embodiments not shown, the annular winding 10 can be designed and constructed as needed for motors having other numbers of phases. The winding coils of different phases wound on the annular yoke 100 will be arranged accordingly. Similar to the embodiment shown, separating ribs 106 extending outward in the radial direction can be provided on the outer circumferential surface of the annular yoke body 101 and in the outer tooth slots 105 to provide additional electrical insulation between the winding coils of different phases.

[0113] Alternatively, in other embodiments not shown, the outer slots 105 in which the winding coils of different phases are wound may be wrapped with insulating paper, or other removable means may be used to achieve electrical insulation between the winding coils of different phases in the same outer slot. The use of removable insulating paper makes the yoke body 101 more flexible during use, eliminating the need for integrally formed separating ribs 106 during manufacture.

[0114] Additionally, in an embodiment not shown, each coil winding portion may be wrapped with insulating paper on the outside, especially at the outer edge of the copper wire, to enhance the electrical insulation performance of the winding coil 200 in the bottom annular winding 10 .

[0115] The toroidal winding 10 is suitable for high-speed motors with high cooling requirements. The high-speed motor with the toroidal winding 10 can be a low-voltage high-speed motor or a high-voltage high-speed motor. The toroidal winding 10 is particularly suitable for high-voltage high-speed motors with an operating voltage in the range of 400V-950V.

Claims

1. A stator winding structure, characterized in that: include: A yoke (100) is provided, wherein a yoke body (101) of the yoke (100) is designed and constructed as a circular ring having a thickness, a plurality of inner tooth grooves (104) are formed on the radial inner side of the yoke body (101) by means of a plurality of inner teeth (102), and a plurality of outer tooth grooves (105) are formed on the radial outer side of the yoke body (101) by means of a plurality of outer teeth (103). a stator lamination (300), the stator lamination (300) being accommodated in the yoke (100), A plurality of winding coils (200), each of the winding coils (200) being wound on the yoke body (101), wherein an effective side of each of the winding coils (200) is accommodated in the inner tooth slot (104) and the outer tooth slot (105), and an end winding of each of the winding coils (200) extends across a width (D) of the yoke body (101) to connect the effective side of the winding coil (200) in the inner tooth slot (104) and the effective side of the winding coil (200) in the outer tooth slot (105).

2. The stator winding structure according to claim 1, characterized in that: The external teeth (103) extend radially outward from the outer peripheral surface of the yoke body (101) away from the yoke body (101), and external tooth grooves (105) are formed between adjacent external teeth (103).

3. The stator winding structure according to claim 2, characterized in that: The external teeth (103) extend in the axial direction beyond the end surface of the yoke body (101) to form a spanning portion (1032) of the external teeth (103).

4. The stator winding structure according to claim 2, wherein: The inner teeth (102) extend radially inward from the inner peripheral surface of the yoke body (101) away from the yoke body (101), and the inner tooth grooves (104) are formed between adjacent inner teeth (102).

5. The stator winding structure according to claim 4, characterized in that: The inner teeth (102) are composed of a longitudinal portion (1021) and a transverse portion (1022), wherein the longitudinal portion (1021) extends radially inward from the inner peripheral surface of the yoke body (101) and has an end, and the transverse portion (1022) intersects with the longitudinal portion (1021) at the end and has a first inner tooth tip (1023) and a second inner tooth tip (1024).

6. The stator winding structure according to any one of claims 1 to 5, characterized in that It also includes an insulating member, which is arranged between adjacent winding coil parts in the winding coil (200) that are out of phase with each other.

7. The stator winding structure according to claim 6, characterized in that: The insulating member is designed to be a separating rib (106) extending radially outward from the outer peripheral surface of the yoke body (101) and formed integrally with the yoke body (101).

8. The stator winding structure according to claim 6, wherein: The insulating member is insulating paper wrapped around the outside of the winding coil portion.

9. A motor, characterized in that: The invention comprises a stator and a motor housing, wherein the stator has a stator winding structure according to any one of claims 1 to 8, and wherein the motor does not have a cooling water jacket, and the motor housing is not provided with a cooling water channel for guiding cooling water to flow therethrough.

10. The motor according to claim 9, wherein The motor uses a gas-liquid mixed refrigerant to cool the stator.

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