Motor stator and motor

Abstract

The invention provides a motor stator and a motor. The motor stator comprises an iron core and a winding which are assembled together. The iron core is provided with a fluid cavity, a plurality of drainage channels and a plurality of winding grooves. The fluid cavity continuously extends in the circumferential direction of the iron core and is used for receiving cooling fluid from the outside, and each winding groove communicates with the fluid cavity through at least one drainage channel, so that the cooling fluid in the fluid cavity can be guided into the corresponding winding groove through the drainage channel. According to the motor stator, under the condition that cooling fluid is injected into the fluid cavity, the cooling fluid can enter the multiple winding grooves through the multiple drainage channels, an additional structure does not need to be arranged to guide the cooling fluid, and therefore the size of the motor stator cannot be increased, and the cooling fluid can be guided into the winding grooves through a relatively simple structure. In this way, the cooling fluid can achieve direct contact cooling of the whole winding and the iron core, and then the cooling effect on the motor stator can be improved.

Description

Technical Field

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

[0002] The motor is used to output torque and power. The cooling of the motor is very important for the motor to output the specified torque and power. The cooling capacity of the motor cooling system is an important factor affecting the continuous output power of the motor.

[0003] A cooling system of a motor in the prior art is designed to form a flow path for a cooling fluid (such as cooling oil) to flow between the iron core and the housing assembly of the motor stator or inside the iron core, and then cool the iron core of the motor stator through the flow path. In addition, the cooling fluid can also flow to the winding end extending from the iron core to cool the winding end. However, this cooling system cannot cool the slot portion of the winding located in the winding slot of the iron core, which will cause the slot portion of the winding to become the most heat-concentrated part of the entire stator, thereby causing adverse effects on the performance of the motor. Another cooling system of a motor in the prior art is designed to form a flow path for a cooling fluid to flow in the winding slot of the motor stator, so that the cooling fluid flows through the flow path to cool the slot portion of the winding located in the winding slot. However, this cooling system requires an additional structure to guide the cooling fluid into the flow path, and the flow path itself will cause the size of the motor stator (especially the radial size) to be too large. Summary of the invention

[0004] This application is made in view of the state of the prior art. One object of the application is to provide a motor stator, which can realize a cooling structure for direct contact cooling of the entire winding and the iron core with a relatively simple structure without increasing the size of the motor stator, thereby improving the performance of the motor including the motor stator. Another object of the application is to provide a motor including the above motor stator.

[0005] In order to achieve the above objectives, the present application may adopt the following technical solutions.

[0006] The present application provides a motor stator as follows, comprising:

[0007] an iron core, wherein a fluid cavity and a plurality of drainage channels are formed, wherein the fluid cavity continuously extends along the circumference of the iron core and is used to receive a cooling fluid from the outside, wherein the plurality of drainage channels are distributed at intervals in the circumferential direction and are all connected to the fluid cavity, wherein the iron core further defines a plurality of winding grooves, wherein the plurality of winding grooves are distributed at intervals in the circumferential direction, and each of the winding grooves is connected to at least one of the drainage channels, so that the cooling fluid in the fluid cavity can be guided to the corresponding winding groove via the drainage channels; and

[0008] A winding is wound around the core, and includes an in-slot portion located in the plurality of winding slots and a protruding portion protruding from the plurality of winding slots.

[0009] In an optional scheme, the iron core has a plurality of winding teeth distributed at intervals in the circumferential direction, the winding grooves are defined between adjacent winding teeth, and the side wall surfaces of the winding teeth for defining the winding grooves are formed with a plurality of cooling flow paths, each of the cooling flow paths is open to the interior of the winding grooves, and each of the cooling flow paths extends along the axial direction of the iron core, and the cooling fluid guided to the winding grooves can flow along the cooling flow paths to both axial sides of the iron core.

[0010] In another optional solution, the plurality of winding grooves are open toward the radial inside, and the cross-sectional area of ​​the cooling flow path located on the radial inside is smaller than the cross-sectional area of ​​the cooling flow path located on the radial outside.

[0011] In another optional scheme, the iron core includes a first split part, a second split part, and a support ring made of insulating material located axially therebetween, the support ring abutting against the first split part and the second split part, so that the fluid cavity and the multiple drainage channels are defined between the support ring and the first split part and the second split part.

[0012] In another optional scheme, the support ring includes a ring main body and a plurality of first axial support parts protruding from the ring main body toward both axial sides, and the plurality of first axial support parts respectively abut against the first split part and the second split part, so that the plurality of drainage channels are defined by the ring main body and the first axial support parts and the first split part and the second split part.

[0013] In another optional solution, the support ring further includes a plurality of support legs and a plurality of second axial support portions.

[0014] The plurality of support legs extend radially inward from the ring body, the plurality of support legs are distributed at intervals in the circumferential direction, and each of the support legs is inserted between the winding grooves adjacent to each other in the circumferential direction.

[0015] The plurality of second axial support portions protrude from the corresponding support legs toward both axial sides, and the plurality of second axial support portions respectively abut against the first split portion and the second split portion.

[0016] In another optional solution, a support slot is defined between the support legs adjacent to each other in the circumferential direction, and the in-slot portion of the winding is inserted through the support slot.

[0017] In another optional solution, the fluid cavity and the plurality of drainage channels are located in the middle of the iron core in the axial direction.

[0018] The present application also provides a motor as follows, comprising the motor stator described in any one of the above technical solutions.

[0019] In an optional solution, a housing assembly is further included, the motor stator is mounted on the housing assembly, the housing assembly is formed with an input passage for inputting cooling fluid, and the input passage is connected to the fluid cavity.

[0020] By adopting the above technical solution, the present application provides a novel motor stator and a motor including the motor stator. The motor stator according to the present application includes an iron core and a winding assembled together. The iron core has a fluid cavity, a plurality of drainage channels and a plurality of winding slots. The fluid cavity extends continuously along the circumference of the iron core and is used to receive a cooling fluid from the outside, and each winding slot is connected to the fluid cavity via at least one drainage channel, so that the cooling fluid in the fluid cavity can be guided to the corresponding winding slot via the drainage channel.

[0021] In this way, when the cooling fluid is injected into the fluid cavity, the cooling fluid can enter the multiple winding slots through the multiple drainage channels, so that the slot parts of the winding located in the winding slots and the iron core can be directly cooled. Furthermore, after the cooling fluid flows along the winding slots to the axial sides of the iron core, the protruding parts of the winding extending from the winding slots can be directly cooled. Since the fluid cavity and the drainage channel are formed in the stator iron core, it is not necessary to set up an additional structure to guide the cooling fluid, so the size of the motor stator will not be increased and the cooling fluid can be guided into the winding slots with a relatively simple structure. As a result, the cooling fluid can achieve direct contact cooling of both the winding as a whole and the iron core, thereby improving the cooling effect on the motor stator, which is beneficial to the improvement of the performance of the motor including the motor stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A is a three-dimensional schematic diagram showing a motor stator according to an embodiment of the present application.

[0023] Figure 1B It shows Figure 1A An enlarged schematic diagram of the local structure of the motor stator.

[0024] Figure 2A It shows Figure 1A A three-dimensional schematic diagram of the support ring of the motor stator.

[0025] Figure 2B It shows Figure 2A Another three-dimensional schematic diagram of the support ring in FIG.

[0026] Figure 2C It shows Figure 2A An enlarged schematic diagram of the local structure of the support ring.

[0027] Figure 3A is a partial cross-sectional schematic diagram showing a motor according to an embodiment of the present application, which includes Figure 1A The motor stator in FIG. 1 is shown with the cross-hatching omitted.

[0028] Figure 3B It shows that along Figure 3A A cross-sectional view of the motor stator taken along the center line S1 - S1 , with the section lines omitted.

[0029] Figure 3C It shows that along Figure 3A A cross-sectional view of the motor stator taken along the center line S2 - S2 , with the section lines omitted.

[0030] Figure 3D It shows that along Figure 3A A cross-sectional view of the motor stator taken along the center line S3 - S3 , with the section lines omitted.

[0031] Description of Reference Numerals

[0032] 1 motor stator;

[0033] 11 iron core; 11r fluid cavity; 11c drainage channel; 11g winding groove; 11p cooling flow path; 111 first split part; 1111 first main body; 1112 first winding tooth; 112 second split part; 1121 second main body; 1122 second winding tooth; 113 support ring; 1131 ring main body; 1132 first axial support part; 1133 support leg; 1134 second axial support part;

[0034] 12 winding; 121 slot inner portion; 122 protruding portion;

[0035] 2 Motor rotor;

[0036] 3 housing assembly; 3c input passage;

[0037] A is axial; R is radial; C is circumferential. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0039] In this application, unless otherwise specified, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the motor, respectively. Furthermore, "axial side" refers to Figure 3A The left side of the axis refers to Figure 3A On the right side in the figure, “radially outer side” refers to the side radially far away from the central axis of the motor, and “radially inner side” refers to the side radially close to the central axis of the motor.

[0040] A motor stator and a motor including the motor stator according to an embodiment of the present application will be described below in conjunction with the accompanying drawings, and in particular, a cooling structure for cooling the motor stator will be described.

[0041] (Motor stator according to one embodiment of the present application)

[0042] In this embodiment, if Figure 1A , Figure 1B , FIG. 3A to FIG. 3D As shown, a motor stator 1 according to an embodiment of the present application includes an iron core 11 and a winding 12 assembled together.

[0043] In this embodiment, if Figure 1A and Figure 3A As shown, the core 11 includes a first split part 111, a second split part 112 and a support ring 113 fixed relative to each other. The support ring 113 is located between the first split part 111 and the second split part 112 in the axial direction A. The first split part 111 and the second split part 112 clamp the support ring 113, so that the support ring 113 abuts against the first split part 111 and the second split part 112, thereby defining a fluid cavity 11r and a plurality of drainage channels 11c between the support ring 113 and the first split part 111 and the second split part 112.

[0044] In this embodiment, the first split portion 111 may be formed by stacking a plurality of silicon steel sheets in the axial direction A. Figure 1A and Figure 3A As shown, the first split portion 111 includes a first main body portion 1111 and a plurality of first winding teeth 1112. The first main body portion 1111 has a cylindrical structure. The plurality of first winding teeth 1112 protrude radially inward from the first main body portion 1111, and the plurality of first winding teeth 1112 are evenly distributed and spaced apart in the circumferential direction C. A winding groove 11g is defined between every two first winding teeth 1112 adjacent to each other in the circumferential direction C, and each winding groove 11g passes through the first split portion 111 along the axial direction A and each winding groove 11g has a radial opening open toward the radial inside. The second split portion 112 can be composed of a plurality of silicon steel sheets stacked together in the axial direction A. As shown Figure 1A , FIG. 3A to FIG. 3DAs shown, the second split portion 112 includes a second main body portion 1121 and a plurality of second winding teeth 1122. The second main body portion 1121 has a cylindrical structure. The plurality of second winding teeth 1122 protrude radially inward from the second main body portion 1121, and the plurality of second winding teeth 1122 are evenly distributed at intervals in the circumferential direction C. A winding groove 11g is defined between every two second winding teeth 1122 adjacent in the circumferential direction C, each winding groove 11g passes through the second split portion 112 along the axial direction A and each winding groove 11g has a radial opening open toward the radial inward side.

[0045] Furthermore, the dimensions of the second main body 1121 of the second split part 112 (including radial dimensions such as inner diameter, outer diameter, axial length, and axial dimensions) can be the same as the dimensions of the first main body 1111 of the first split part 111, and the dimensions of the second winding teeth 1122 can be the same as the dimensions of the first winding teeth 1112. The winding grooves 11g of the first split part 111 and the second split part 112 are aligned with each other, so that the winding grooves 11g of the two together constitute the winding grooves of the core 11. In addition, as FIG. 3B to FIG. 3D As shown, the side wall surface of the second winding tooth 1122 for defining the winding groove 11g is formed with a plurality of cooling channels 11p. Each cooling channel 11p is open to the inside of the winding groove 11g, and each cooling channel 11p extends linearly along the axial direction A over the entire axial length of the second split part 112. The pressure drop of the cooling fluid in the plurality of cooling channels 11p parallel to each other is small, which is conducive to the cooling fluid maintaining pressure in the plurality of cooling channels 11p. Thus, the cooling fluid guided into the winding groove 11g can flow along the cooling channels 11p to both axial sides of the core 11. Furthermore, the cross-sectional shape of each cooling channel 11p is semicircular, and its cross-sectional area is the same over the entire axial length of the cooling channel 11p. The cross-sectional area of ​​the cooling channel 11p located radially inward is smaller than the cross-sectional area of ​​the cooling channel 11p located radially outward, that is, among the plurality of cooling channels 11p, the cross-sectional area of ​​the cooling channel 11p closer to the radial inward is smaller. This has little influence on the magnetic flux density of the second winding tooth 1122. In addition, similarly to the second winding tooth 1122, the first winding tooth 1112 also has a plurality of cooling channels 11p having the same number, shape, and layout.

[0046] In this embodiment, the support ring 113 may be made of insulating material. Figures 1A to 3D As shown, the support ring 113 includes a ring body portion 1131 , a plurality of first axial support portions 1132 , a plurality of support legs 1133 , and a plurality of second axial support portions 1134 that are formed as one piece.

[0047] Specifically, FIG. 2A to FIG. 2CAs shown, the ring body 1131 is formed into a ring shape extending continuously along the circumferential direction C over the entire circumference. Figure 1A , Figure 1B and Figure 3A As shown, the outer diameter of the ring body 1131 of the support ring 113 is smaller than the outer diameters of the first body 1111 of the first split part 111 and the second body 1121 of the second split part 112, so that a fluid cavity 11r is defined between the ring body 1131, the first body 1111 and the second body 1121. In other words, the fluid cavity 11r extends continuously along the circumferential direction C over the entire circumference, and the fluid cavity 11r is located radially outside the ring body 1131, on the other axial side of the first body 1111 and on one axial side of the second body 1121. In an optional solution, the fluid cavity 11r does not have to extend continuously over the entire circumference, and can extend along the circumferential direction C with other circumferential lengths.

[0048] Furthermore, if FIG. 2A to FIG. 2C As shown, a plurality of first axial support portions 1132 protrude from the axial side surface of the ring body portion 1131 toward both axial sides, and the plurality of first axial support portions 1132 respectively abut against the first body portion 1111 and the second body portion 1121, so that a plurality of drainage channels 11c are defined between the ring body portion 1131 and the first axial support portion 1132 and the first body portion 1111, and a plurality of drainage channels 11c are also defined between the ring body portion 1131 and the first axial support portion 1132 and the second body portion 1121 (that is, a plurality of drainage channels 11c are defined between the ring body portion 1131 and the first axial support portion 1132 and the first split portion 111 and the second split portion 112), and these drainage channels 11c are distributed at intervals in the circumferential direction C and are all connected to the fluid cavity 11r. In addition, as shown in FIG. Figure 3D As shown, the plurality of first axial support portions 1132 and the plurality of second winding teeth 1122 (the plurality of first winding teeth 1112) are staggered in the circumferential direction C, so that the first axial support portions 1132 overlap with the corresponding winding slots 11g in the circumferential direction C, so that one winding slot 11g is connected with the plurality of drainage channels 11c adjacent in the circumferential direction C. The fluid cavity 11r and the plurality of drainage channels 11c are located in the middle of the core 11 in the axial direction A, so that the cooling fluid in the fluid cavity 11r can be guided by the drainage channel 11c into the split portions 111 and 112 on both sides, so that the two split portions 111 and 112 are evenly cooled, thereby improving the cooling effect of the entire motor stator 1.

[0049] Furthermore, if FIG. 2A to FIG. 2CAs shown, a plurality of support legs 1133 extend radially inward from the ring body 1131, and the plurality of support legs 1133 are evenly distributed at intervals in the circumferential direction C and correspond to the plurality of second winding teeth 1122 (the plurality of first winding teeth 1112) in the circumferential direction C. Figure 3C As shown, each support leg 1133 is inserted between adjacent winding slots 11g in the circumferential direction C, thereby defining a support slot between adjacent support legs 1133 in the circumferential direction C, and the slot in-slot portion 121 of the winding 12 is inserted through the support slot. Furthermore, the ring body portion 1131 can be pressed against the slot in-slot portion 121 of the winding 12 from the radial outside to radially limit the support ring 113 through the winding 12.

[0050] Furthermore, if FIG. 2A to FIG. 2C As shown, multiple second axial support portions 1134 protrude from the axial side surfaces of the corresponding support legs 1133 toward both axial sides, and each second axial support portion 1134 respectively abuts against a pair of first winding teeth 1112 and second winding teeth 1122, thereby supporting and limiting the support legs 1133 in the axial direction A.

[0051] In this embodiment, if Figure 1A and Figure 3A As shown, the winding 12 can be a hairpin winding or a wave winding. The winding 12 includes a slot portion 121 and a protruding portion 122. Specifically, the winding 12 is wound and installed on the winding teeth 1112, 1122, a part of the winding 12 is inserted into the winding slot 11g to form the slot portion 121, and the axial ends of the winding 12 protrude from the iron core 11 to form the protruding portion 122.

[0052] A motor according to an embodiment of the present application is described below.

[0053] (A motor according to an embodiment of the present application)

[0054] like Figure 3A As shown, a motor according to an embodiment of the present application includes a motor stator 1 , a motor rotor 2 and a housing assembly 3 which are assembled together.

[0055] In this embodiment, if Figure 3A As shown, the motor stator 1 is mounted on the housing assembly 3 and has the specific structure described above. The motor rotor 2 is located radially inside the motor stator 1 and can rotate relative to the motor stator 1, and the motor rotor 2 is spaced apart from the motor stator 1 to have an air gap of a predetermined size. The housing assembly 3 is formed with an input passage 3c that is connected to the fluid cavity 11r formed by the motor stator 1. The input passage 3c can also be connected to a fluid storage device and a fluid pumping device, so that the cooling fluid pumped and input through the input passage 3c can fill the fluid cavity 11r.

[0056] By adopting the above structure, after the fluid cavity 11r is pumped and filled with cooling fluid, the cooling fluid in the fluid cavity 11r enters the winding groove 11g of the first split part 111 and the second split part 112 through multiple drainage paths. The cooling fluid entering the winding groove 11g of the first split part 111 flows toward one axial side along multiple cooling flow paths 11p, cools the core 11 and the slot part 121 of the winding 12 during the flow, and then cools the protruding part 122 of the winding 12 located on one axial side after flowing out of the core 11. The cooling fluid entering the winding groove 11g of the second split part 112 flows toward the other axial side along multiple cooling flow paths 11p, cools the core 11 and the slot part 121 of the winding 12 during the flow, and then cools the protruding part 122 of the winding 12 located on the other axial side after flowing out of the core 11. In this way, the cooling fluid can effectively reduce the temperature of the iron core 11 and the entire winding 12, thereby reducing the adverse effects caused by excessive stator temperature during the operation of the motor, thereby increasing the continuous output power of the motor and improving the performance of the motor.

[0057] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application. The following is a supplementary description of the technical solution of the present application.

[0058] i. In the present application, the core 11 is not limited to the specific structure described in the above embodiments. The core 11 can be designed as an integral unit, as long as the core 11 is formed with a fluid cavity 11r extending along the entire circumference C and a drainage channel 11c for guiding the cooling fluid in the fluid cavity 11r to the winding groove 11g. The number, structure and shape of the drainage channel 11c are also not limited to the above specific embodiments.

[0059] ii. It can be understood that, in the application, the support ring 113 has a certain sealing function, and the support ring 113 can be tightly against the first split part 111 and the second split part 112, so as to smoothly guide the cooling fluid into the winding groove 11g.

[0060] iii. It can be understood that the motor of the present application can be used in a vehicle power system. The vehicle power system can be an electric bridge drive system, which can also include a transmission mechanism such as a transmission, and the motor is connected to the input shaft of the transmission to achieve bidirectional torque transmission. The electric bridge drive system can be used as a drive system for a pure electric vehicle, or it can be used in conjunction with an engine to form a hybrid power system for a hybrid vehicle.

Claims

1. A motor stator, characterized in that: include: An iron core (11), which is formed with a fluid cavity (11r) and a plurality of drainage channels (11c), wherein the fluid cavity (11r) extends continuously along the circumference (C) of the iron core (11) and is used to receive cooling fluid from the outside, and the plurality of drainage channels (11c) are distributed at intervals in the circumference (C) and are all connected to the fluid cavity (11r), and the iron core (11) further defines a plurality of winding grooves (11g), wherein the plurality of winding grooves (11g) are distributed at intervals in the circumference (C), and each of the winding grooves (11g) is connected to at least one of the drainage channels (11c), so that the cooling fluid in the fluid cavity (11r) can be guided to the corresponding winding groove (11g) via the drainage channels (11c); and A winding (12) is wound around the iron core (11), and includes an in-slot portion (121) located in the plurality of winding slots (11g) and a protruding portion (122) protruding from the plurality of winding slots (11g).

2. The motor stator according to claim 1, characterized in that: The iron core (11) has a plurality of winding teeth (1112, 1122) distributed at intervals in the circumferential direction (C), the winding groove (11g) is defined between adjacent winding teeth (1112, 1122), and a plurality of cooling channels (11p) are formed on the side wall surfaces of the winding teeth (1112, 1122) for defining the winding groove (11g), each of the cooling channels (11p) is open toward the interior of the winding groove (11g), and each of the cooling channels (11p) extends along the axial direction (A) of the iron core (11), and the cooling fluid guided to the winding groove (11g) can flow along the cooling channels (11p) to both axial sides of the iron core (11).

3. The motor stator according to claim 2, characterized in that: The plurality of winding grooves (11g) are open toward the radial inside, and the cross-sectional area of ​​the cooling flow path (11p) located on the radial inside is smaller than the cross-sectional area of ​​the cooling flow path (11p) located on the radial outside.

4. The motor stator according to any one of claims 1 to 3, characterized in that: The iron core (11) comprises a first split part (111), a second split part (112) fixed to each other, and a support ring (113) made of insulating material located therebetween in the axial direction (A); the support ring (113) abuts against the first split part (111) and the second split part (112), so that the fluid chamber (11r) and the plurality of drainage channels (11c) are defined between the support ring (113) and the first split part (111) and the second split part (112).

5. The motor stator according to claim 4, characterized in that: The support ring (113) comprises a ring body portion (1131) and a plurality of first axial support portions (1132) protruding from the ring body portion (1131) toward both axial sides, and the plurality of first axial support portions (1132) respectively abut against the first split portion (111) and the second split portion (112), so that the plurality of drainage channels (11c) are defined and formed between the ring body portion (1131) and the first axial support portions (1132) and the first split portion (111) and the second split portion (112).

6. The motor stator according to claim 5, characterized in that: The support ring (113) further comprises a plurality of support legs (1133) and a plurality of second axial support portions (1134). The plurality of support legs (1133) extend radially inward from the ring body (1131), the plurality of support legs (1133) are distributed at intervals in the circumferential direction (C), and each of the support legs (1133) is inserted between the adjacent winding grooves (11g) in the circumferential direction (C). The plurality of second axial support portions (1134) protrude from the corresponding support legs (1133) toward both axial sides, and the plurality of second axial support portions (1134) respectively abut against the first split portion (111) and the second split portion (112).

7. The motor stator according to claim 6, characterized in that: A support slot is defined between the support legs (1133) adjacent to each other in the circumferential direction (C), and the in-slot portion (121) of the winding (12) is inserted through the support slot.

8. The motor stator according to claim 4, characterized in that: The fluid chamber (11r) and the plurality of drainage channels (11c) are located in the middle of the iron core (11) in the axial direction (A).

9. A motor, characterized in that: The invention comprises a motor stator (1) according to any one of claims 1 to 8.

10. The motor according to claim 9, characterized in that The motor further comprises a housing assembly (3), the motor stator (1) being mounted on the housing assembly (3), the housing assembly (3) being provided with an input passage (3c) for inputting cooling fluid, the input passage (3c) being in communication with the fluid chamber (11r).

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