Stator core, stator and motor

Abstract

The utility model relates to a stator core, a stator and a motor. The stator iron core comprises an iron core body, the iron core body comprises a ring-column-shaped yoke part, an inner tooth part and an outer tooth part, the inner circumferential wall of the yoke part is connected with the inner tooth part, and the outer circumferential wall of the yoke part is connected with the outer tooth part in the radial direction of the yoke part; and at least one medium flow channel is formed in the yoke part and is used for introducing a heat exchange medium, so that the heat exchange medium exchanges heat with the iron core body. Due to the fact that the inner tooth portion is arranged inside the yoke portion, the outer tooth portion is arranged outside the yoke portion, and the medium flow channel is arranged on the yoke portion, in the process that a heat exchange medium flows through the medium flow channel, the heat exchange medium absorbs heat generated by stator windings arranged on the inner tooth portion and the outer tooth portion at the same time through the iron core body. The effect of simultaneously cooling the stator windings respectively arranged on the inner tooth part and the outer tooth part is achieved.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a stator core, a stator, and a motor. Background Art

[0002] With the country's strong promotion of industrial upgrading, the motor field will continue to develop towards high speed and miniaturization. As a result, the motor power density, loss density, etc. are all increasing continuously, and the heat generation of the motor winding will further increase.

[0003] Excessive temperature of the winding will cause the motor to operate at a high temperature, which will lead to a decline in the performance and shortening of the lifespan of each component inside the motor (such as the aging of insulation parts). At the same time, this will also increase the failure rate of the motor and the safety risk. Utility Model Content

[0004] Based on this, in view of the problems caused by the winding heat generation resulting in the motor operating at a high temperature, it is necessary to provide a stator core.

[0005] A stator core includes a core body. The core body includes an annular yoke portion, an inner tooth portion, and an outer tooth portion. Along the radial direction of the yoke portion, the inner peripheral wall of the yoke portion is connected to the inner tooth portion, and the outer peripheral wall of the yoke portion is connected to the outer tooth portion. At least one medium flow channel is formed in the yoke portion. The medium flow channel is used to introduce a heat exchange medium so that the heat exchange medium exchanges heat with the core body.

[0006] In one embodiment, along the flow direction of the medium flow channel, a first port and a second port are formed at both ends of the medium flow channel. Along the axial direction of the yoke portion, the yoke portion has a first end face and a second end face facing in opposite directions; wherein: the first port is located on the first end face, and the second port is located on the second end face. Alternatively, both the first port and the second port are located on the first end face. Alternatively, both the first port and the second port are located on the second end face.

[0007] In one embodiment, the number of the medium flow channels is configured to be multiple, and the multiple medium flow channels are arranged in sequence along the circumferential direction of the yoke portion, and two adjacent medium flow channels are spaced apart. The stator core further includes: a connecting pipe fitting, and the connecting pipe fitting is used to connect two adjacent medium flow channels.

[0008] In one embodiment, the iron core body includes a plurality of iron core laminations which are stacked in sequence to form the iron core body. Each iron core lamination includes a sub-yoke portion, a sub-inner tooth portion and a sub-outer tooth portion. Along the radial direction of the iron core lamination, the inner edge of the sub-yoke portion is connected to the sub-inner tooth portion, and the outer edge of the sub-yoke portion is connected to the sub-outer tooth portion. The plurality of iron core laminations are stacked in sequence such that a plurality of sub-yoke portions are stacked to form the yoke portion, a plurality of sub-inner tooth portions form the inner tooth portion, and a plurality of sub-outer tooth portions form the outer tooth portion. An assembly hole is formed in the sub-yoke portion. Along the axial direction of the iron core body, the assembly holes of two adjacent iron core laminations communicate with each other, and a plurality of sequentially communicating assembly holes form an assembly channel of the iron core body. The stator iron core further includes a fixing rod which is assembled in the assembly channel and is used for fixing the plurality of sequentially stacked iron core laminations. A dielectric through hole is formed in the sub-yoke portion. In the iron core body, the dielectric through holes of two adjacent iron core laminations communicate with each other, and a plurality of sequentially communicating dielectric through holes form a dielectric flow channel.

[0009] In one embodiment, the number of the assembly holes and the number of the dielectric through holes are both configured to be multiple, and the multiple assembly holes and the multiple dielectric through holes are sequentially arranged along the circumferential direction of the sub-yoke portion.

[0010] In one embodiment, the iron core lamination includes a plurality of arc-shaped lamination monomers, and the plurality of sequentially connected lamination monomers form the iron core lamination.

[0011] In one embodiment, along the arc length direction of the lamination monomer, a first assembly portion is formed at one end of the lamination monomer, and a second assembly portion is formed at the other end of the lamination monomer. In two adjacent lamination monomers, the first assembly portion of one lamination monomer is in mating connection with the second assembly portion of the other lamination monomer.

[0012] In one embodiment, the first assembly portion is one of a clamping protrusion and a clamping notch, and the second assembly portion is the other of the clamping protrusion and the clamping notch, and the clamping protrusion is in clamping fit with the clamping notch.

[0013] For the above-mentioned stator iron core, since the inner tooth portion is arranged inside the yoke portion, the outer tooth portion is arranged outside the yoke portion, and the dielectric flow channel is arranged in the yoke portion, during the process of the heat exchange medium flowing through the dielectric flow channel, the heat exchange medium absorbs the heat generated by the stator windings respectively arranged on the inner tooth portion and the outer tooth portion through the iron core body, achieving the effect of simultaneously cooling the stator windings respectively arranged on the inner tooth portion and the outer tooth portion.

[0014] The present application further provides a stator which includes a stator iron core, a first stator winding and a second stator winding, wherein the stator iron core is the stator iron core in some of the above embodiments, the first stator winding is assembled on the inner tooth portion, and the second stator winding is assembled on the outer tooth portion.

[0015] The present application further provides a motor, which includes a stator, a first rotor, and a second rotor. The stator is the stator in some of the above embodiments, the stator is sleeved outside the first rotor, and the second rotor is sleeved outside the stator. Description of the Drawings

[0016] Figure 1 It is a perspective view of the stator in some examples according to the present application.

[0017] Figure 2 It is Figure 1 the enlarged view at position A in

[0018] Figure 3 It is a schematic structural view of the iron core laminations in some examples according to the present application.

[0019] Figure 4 It is a schematic structural view of a single lamination in some examples according to the present application.

[0020] Reference Numerals in the Drawings:

[0021] 1. Stator core

[0022] 10. Iron core body; 10b. Inner tooth part; 10c. Outer tooth part

[0023] 11. Iron core lamination; 11a. Sub yoke part; 11b. Sub inner tooth part; 11c. Sub outer tooth part; 11d. Assembly channel

[0024] 111. Dielectric through hole; 112. Assembly hole; 113. Inner tooth; 114. Outer tooth

[0025] 12. Single lamination; 12a. First single lamination; 12b. Second single lamination; 12c. Third single lamination; 12d. Fourth single lamination

[0026] 121. First assembly part; 122. Second assembly part; 123. Clamping protrusion; 124. Clamping notch

[0027] 131. First end plate; 132. Second end plate; 134. Connecting pipe fitting

[0028] 100. Stator; 110. First stator winding; 120. Second stator winding Detailed Embodiments

[0029] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0031] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0032] In the present application, unless otherwise clearly specified and limited, if terms such as "mounted", "connected", "coupled", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] In this application, unless otherwise clearly specified and defined, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0035] In the related art, with the country's strong promotion of industrial upgrading, the motor field will continue to develop towards high speed and miniaturization. In order to meet the requirements of new energy vehicles or special application scenarios for the output torque and axial dimensions of motors, a dual-rotor motor is proposed, and the stator of this motor has two sets of stator windings.

[0036] During the operation of the motor, since the stator of this motor has two sets of stator windings, the heat generated by the motor is also relatively large, resulting in the motor operating at a high temperature. This will cause the performance of each component inside the motor to decline and the lifespan to be shortened (such as the aging of insulating parts). At the same time, it will also increase the failure rate of the motor and the safety risk.

[0037] In order to effectively reduce the impact of the heat generated by the winding operation on the motor, this application proposes a stator core 1.

[0038] Refer to Figure 1 As shown, Figure 1 The perspective view of the stator 100 with the stator core 1 in some embodiments of this application is shown. The stator core 1 provided by some embodiments of this application includes a core body 10, and the core body 10 includes an annular yoke portion, an inner tooth portion 10b and an outer tooth portion 10c. Refer to Figure 1As shown, in an embodiment of the present application, the shape of the cross-section of the yoke perpendicular to its axial direction is taken as an example of a circular ring, but the present application is not limited thereto. The shape of the cross-section of the yoke perpendicular to its axial direction can also be a rectangular ring structure, or can also be a ring structure with other numbers of polygonal shapes (for example: triangle, hexagon, octagon, etc.).

[0039] Along the radial direction of the yoke, the inner peripheral wall of the yoke is connected to the inner tooth portion 10b, and the outer peripheral wall of the yoke is connected to the outer tooth portion 10c. It can also be understood that the inner tooth portion 10b is arranged inside the yoke, and the outer tooth portion 10c is arranged outside the yoke. The inner tooth portion 10b can be used to assemble the first stator winding 110 of the stator 100, and the outer tooth portion 10c can be used to assemble the second stator winding 120 of the stator 100, so that the stator 100 of the stator core 1 adopting some embodiments of the present application can be applied to a dual-rotor motor.

[0040] At least one medium flow channel is formed inside the yoke. It can also be understood that one medium flow channel is formed inside the yoke, or multiple medium flow channels are formed inside the yoke. The medium flow channel can be used to communicate with the medium inlet and the medium outlet of the temperature control device of the motor. The heat exchange medium flows into the medium flow channel from the temperature control device through the medium outlet to achieve the effect of introducing the heat exchange medium into the medium flow channel.

[0041] During the process of the heat exchange medium flowing along the medium flow channel, the heat exchange medium exchanges heat with the iron core body 10, and the heat exchange medium returns to the temperature control device through the medium inlet after flowing through the medium flow channel. The temperature control device is also used to adjust the temperature of the heat exchange medium to ensure the heat exchange efficiency between the heat exchange medium flowing into the medium flow channel and the iron core body 10.

[0042] Exemplarily, during the operation of the motor, the temperature of the stator winding rises. The temperature control device adjusts the heat exchange medium to a preset temperature (the temperature of the heat exchange medium can absorb the heat of the stator winding. It can also be understood that the heat exchange medium is a coolant), and the temperature control device supplies the heat exchange medium to the stator core 1 so that the heat exchange medium flows into the medium flow channel. Since the inner tooth portion 10b is arranged inside the yoke, the outer tooth portion 10c is arranged outside the yoke, and the medium flow channel is arranged in the yoke, during the process of the heat exchange medium flowing through the medium flow channel, the heat exchange medium absorbs the heat generated by the stator windings respectively arranged on the inner tooth portion 10b and the outer tooth portion 10c through the iron core body 10 at the same time, achieving the effect of simultaneously cooling the stator windings respectively arranged on the inner tooth portion 10b and the outer tooth portion 10c.

[0043] Since the temperatures of the stator windings respectively arranged on the inner tooth portion 10b and the outer tooth portion 10c can be controlled within a certain range, this also enables the motor to operate in a suitable temperature state, thereby being able to ensure that the motor maintains a high-performance operating state, and also having the advantages of prolonging the service life of the motor and improving the safety of the motor.

[0044] It should also be noted that in some of the above embodiments, the heat exchange medium is used as the coolant for illustration, but the present application is not limited thereto, and the heat exchange medium can also be used to heat the motor. Exemplarily, the motor is arranged in a severe cold environment (such as -50 °C). Due to the low environmental temperature, the internal temperature of the motor will also be in a low temperature state. In order to ensure that the motor can operate in a high-performance state under such environmental temperature conditions, the temperature control device adjusts the heat exchange medium to a preset temperature (the temperature of the heat exchange medium can meet the requirement of raising the operating temperature of the motor), and the temperature control device supplies the heat exchange medium to the stator core 1 so that the heat exchange medium flows into the medium flow channel. During the process that the high-temperature heat exchange medium flows through the medium flow channel, the heat possessed by the heat exchange medium is released through the core body 10, thereby being able to raise the internal temperature of the motor. In this way, the motor can still maintain a high-performance operating state in a low-temperature environment.

[0045] Refer to Figure 1 As shown, in some embodiments, along the axial direction of the yoke, the yoke has a first end face and a second end face facing opposite directions. In addition, along the flow direction of the medium flow channel, first and second ports are formed at both ends of the medium flow channel, where: the first port can be located on the first end face, the second port can be located on the second end face, or, both the first port and the second port are located on the first end face, or, both the first port and the second port are located on the second end face.

[0046] Exemplarily, taking the case where one medium flow channel is formed in the yoke as an example for illustration, where the first port is used to communicate with the medium outlet of the temperature control device, and the second port is used to communicate with the medium inlet of the temperature control device.

[0047] When the first port is located on the first end face and the second port is located on the second end face, the heat exchange medium flows from the side of the first end face along the axial direction of the yoke towards the side of the second end face. In the axial direction of the yoke, the heat exchange medium flows through the entire yoke, ensuring the time for the heat exchange medium to flow through the core body 10 and enabling the heat exchange medium to fully exchange heat with the core body 10. It should be additionally noted that the above example only makes restrictions on the first port and the second port being respectively located on the first end face and the second end face, so that during the process that the heat exchange medium flows along the medium flow channel, the heat exchange medium completely flows through the entire yoke in the axial direction of the yoke. Along the axial direction of the yoke, the shape of the medium flow channel can be linear (i.e., the central axis of the medium flow channel is parallel to the axial direction of the yoke), or, the shape of the medium flow channel is arc-shaped or spiral-shaped, etc.

[0048] When both the first port and the second port are located on the first end face, during the process of the heat exchange medium flowing along the medium flow channel, the heat exchange medium first flows from one side of the first end face axially along the yoke towards the second end face, and then the flow direction of the heat exchange medium turns back so that the heat exchange medium flows from the second end face towards the first end face. Similarly, when both the first port and the second port are located on the second end face, during the process of the heat exchange medium flowing along the medium flow channel, the heat exchange medium first flows from one side of the second end face axially along the yoke towards the first end face, and then the flow direction of the heat exchange medium turns back so that the heat exchange medium flows from the first end face towards the second end face. By arranging both the first port and the second port on the first end face or the second end face, this is beneficial to the internal structure layout of the motor. For example, axially of the stator core 1, the pipelines for connecting between the medium inlet of the temperature control device and the medium flow channel, and the pipelines for connecting between the medium outlet of the temperature control device and the medium flow channel are all located on one side of the stator core 1, thus avoiding occupying the space on the other side of the stator core 1, being beneficial to the spatial layout of the motor, and further being able to help reduce the overall volume of the motor.

[0049] Referring to Figure 1 and Figure 2 As shown, in some embodiments, the number of the medium flow channels is configured to be multiple, and the multiple medium flow channels are arranged in sequence along the circumferential direction of the yoke, and two adjacent medium flow channels are spaced apart. The stator core 1 further includes a communicating pipe fitting 134, and the communicating pipe fitting 134 is used for communicating two adjacent medium flow channels.

[0050] Exemplarily, in an embodiment of the present application, taking the shape of the medium flow channel being linear, and the first port of each medium flow channel being located on the first end face, and the second port of each medium flow channel being located on the second end face as an example for illustration.

[0051] Referring to Figure 2As shown, along the circumferential direction of the yoke, the connecting pipe fitting 134 is assembled on one side close to the first end face and / or the second end face. The first interface and the second interface of the connecting pipe fitting 134 located on the side close to the first end face are respectively used to connect the first ports of two adjacent medium flow channels, and the first interface and the second interface of the connecting pipe fitting 134 located on the side close to the second end face are respectively used to connect the second ports of two adjacent medium flow channels. The connecting pipe fitting 134 is connected between two adjacent medium flow channels, so that two medium flow channels and a connecting pipe fitting 134 cooperate to form a "U"-shaped flow path. Two medium flow channels are selected from multiple medium flow channels. The first port of one of the two medium flow channels is communicated with the medium outlet of the temperature control device, and the first port of the other medium flow channel of the two medium flow channels is communicated with the medium inlet of the temperature control device. And the second ports of these two medium flow channels are respectively communicated with the second ports of their adjacent medium flow channels, so that multiple medium flow channels and multiple connecting pipe fittings 134 form a one-way flowing flow path. It should be added that, however, the one-way flowing flow path here means that the heat exchange medium flows in a single direction along this flow path.

[0052] Refer to Figure 1 and Figure 2 As shown, for example, the number of medium flow channels is configured to be three, and the number of connecting pipe fittings 134 is configured to be two. The three medium flow channels are the first medium flow channel, the second medium flow channel and the third medium flow channel, and the two connecting pipe fittings are the first connecting pipe fitting and the second connecting pipe fitting. Among them, the first medium flow channel and the third medium flow channel are selected to be communicated with the temperature control device.

[0053] More specifically, the first port of the first medium flow channel is communicated with the medium outlet of the temperature control device. The first connecting pipe fitting is connected between the second port of the first medium flow channel and the second port of the second medium flow channel, and the second connecting pipe fitting is connected between the first port of the second medium flow channel and the first port of the third medium flow channel. The second port of the third medium flow channel is communicated with the medium inlet of the temperature control device. After the heat exchange medium is discharged from the temperature control device through the medium outlet, the heat exchange medium flows from the first port of the first medium flow channel to the second port of the first medium flow channel, and then the heat exchange medium flows into the second port of the second medium flow channel through the first connecting pipe fitting, and then the heat exchange medium flows from the second port of the second medium flow channel to the first port of the second medium flow channel, and then the heat exchange medium flows into the first port of the third medium flow channel through the second connecting pipe fitting, and then the heat exchange medium flows from the first port of the third medium flow channel to the second port of the third medium flow channel, and finally the heat exchange medium flows into the medium inlet of the temperature control device from the second port of the third medium flow channel, so that the heat exchange medium circulates between the temperature control device and the stator core 1.

[0054] Refer to Figure 1 and Figure 3As shown, in some embodiments, the iron core body 10 includes a plurality of iron core laminations 11, and the plurality of iron core laminations 11 are stacked in sequence to form the iron core body 10. In other embodiments, the iron core body 10 can also be made by a casting process, or alternatively, the iron core body 10 is made by 3D printing.

[0055] Refer to Figure 3 As shown, the iron core lamination 11 includes a sub-yoke portion 11a, a sub-inner tooth portion 11b, and a sub-outer tooth portion 11c. Along the radial direction of the iron core lamination 11, the inner edge of the sub-yoke portion 11a is connected to the sub-inner tooth portion 11b, and the outer edge of the sub-yoke portion 11a is connected to the sub-outer tooth portion 11c. Refer to Figure 3 and Figure 1 As shown, the plurality of iron core laminations 11 are stacked in sequence. Along the axial direction of the iron core body 10, the orthographic projections of the sub-yoke portions 11a of two adjacent iron core laminations 11 completely coincide, so that the plurality of sub-yoke portions 11a are stacked to form the yoke portion. The orthographic projections of the sub-inner tooth portions 11b of two adjacent iron core laminations 11 completely coincide, so that the plurality of sub-inner tooth portions 11b are stacked to form the inner tooth portion 10b. The orthographic projections of the sub-outer tooth portions 11c of two adjacent iron core laminations 11 completely coincide, so that the plurality of sub-outer tooth portions 11c are stacked to form the outer tooth portion 10c.

[0056] Refer to Figure 3 As shown, in some embodiments, the sub-yoke portion 11a is formed with an assembly hole 112. When the plurality of iron core laminations 11 are stacked to form the iron core body 10, along the axial direction of the iron core body 10, the central axes of the assembly holes 112 of two adjacent iron core laminations 11 are coaxially arranged, and the assembly holes 112 of two adjacent iron core laminations 11 are communicated. The plurality of sequentially communicated assembly holes 112 form an assembly channel 11d of the iron core body 10, so that the central axis of the assembly channel 11d is parallel to the central axis of the iron core body 10. The stator iron core 1 further includes a fixing rod, and the fixing rod is assembled in the assembly channel 11d. The fixing rod is used to fix the plurality of sequentially stacked iron core laminations 11, thereby restricting the relative positions of any two of the plurality of iron core laminations 11 to stack the plurality of iron core laminations 11 to form the iron core body 10. In some embodiments, the fixing rod can be a rivet or a screw connection member (for example: a screw and a nut).

[0057] Refer to Figure 2 As shown, the stator iron core 1 can also include a first end plate 131 and a second end plate 132. Along the axial direction of the iron core body 10, the first end plate 131 is fixedly assembled on one side of the iron core body 10, and the second end plate 132 is fixedly assembled on the other side of the iron core body 10. Both the first end plate 131 and the second end plate 132 are annular structures, and both the first end plate 131 and the second end plate 132 are adapted to be assembled with the housing of the motor, so that the iron core body 10 is assembled with the housing of the motor.

[0058] In some embodiments, both the first end plate 131 and the second end plate 132 are formed with assembly corresponding holes and communication corresponding holes. When the first end plate 131 and the second end plate 132 are fixedly assembled on both sides of the iron core body 10, along the axial direction of the iron core body 10, the assembly corresponding holes communicate with the assembly channels 11d correspondingly, and the communication corresponding holes communicate with the medium flow channels correspondingly. Thus, the first end plate 131 and the second end plate 132 can be respectively fixedly assembled on both sides of the iron core body 10 through fixing rods, and the communication pipe fittings 134 can be assembled on the first end plate 131 and the second end plate 132 so that the communication pipe fittings 134 are used to communicate two adjacent medium flow channels.

[0059] Referring to Figure 3 As shown, in some embodiments, the sub-yoke portion 11a is formed with a medium through hole 111. When a plurality of iron core laminations 11 are stacked to form the iron core body 10, in the iron core body 10, the medium through holes 111 of two adjacent iron core laminations 11 communicate with each other, and a plurality of sequentially communicating medium through holes 111 form a medium flow channel.

[0060] Referring to Figure 1 and Figure 3 As shown, in some embodiments, when a plurality of iron core laminations 11 are stacked to form the iron core body 10, the positive projections of the medium through holes 111 of two adjacent iron core laminations 11 in the axial direction of the iron core body 10 completely coincide, so that the central axis of the medium flow channel formed by a plurality of sequentially communicating medium through holes 111 is parallel to the central axis of the iron core body 10. It can also be understood that, along the axial direction of the iron core body 10, the shape of the medium flow channel is linear.

[0061] In other embodiments, when a plurality of iron core laminations 11 are stacked to form the iron core body 10, the positive projections of the medium through holes 111 of two adjacent iron core laminations 11 in the axial direction of the iron core body 10 partially coincide, so that the medium flow channel formed by a plurality of sequentially communicating medium through holes 111 is arc-shaped or spiral-shaped.

[0062] Referring to Figure 1 and Figure 3 As shown, in some embodiments, the number of assembly holes 112 and the number of medium through holes 111 are both configured to be multiple. The multiple assembly holes 112 and the multiple medium through holes 111 are sequentially arranged along the circumferential direction of the sub-yoke portion 11a. When a plurality of iron core laminations 11 are stacked to form the iron core body 10, the iron core body 10 is formed with a plurality of assembly channels 11d and a plurality of medium flow channels, and the plurality of assembly channels 11d and the plurality of medium flow channels are sequentially arranged along the circumferential direction of the iron core body 10. A plurality of assembly channels 11d are formed, so that a plurality of iron core laminations 11 are fixed to form the iron core body 10 through a plurality of fixing rods, and a plurality of medium flow channels are also formed in the iron core body 10, increasing the flow rate of the heat exchange medium flowing through the iron core body 10 per unit time (for example, the unit time is one second).

[0063] In some embodiments, along the radial direction of the sub-yoke portion 11a, the distance between the center of the assembly hole 112 and the center of the sub-yoke portion 11a is R1, and the distance between the center of the dielectric through-hole 111 and the center of the sub-yoke portion 11a is R2, satisfying the relation R1 = R2, so that the assembly holes 112 and the dielectric through-holes 111 are uniformly arranged along the same circumferential line of the sub-yoke portion 11a, avoiding stress concentration in the sub-yoke portion 11a.

[0064] In some embodiments, along the circumferential direction of the sub-yoke portion 11a, at least one dielectric through-hole 111 is formed between two adjacent assembly holes 112. It can also be understood that, along the circumferential direction of the sub-yoke portion 11a, one dielectric through-hole 111 is formed between every two assembly holes 112, or multiple dielectric through-holes 111 are formed between every two assembly holes 112. In some embodiments of the present application, along the circumferential direction of the sub-yoke portion 11a, at least multiple dielectric through-holes 111 are formed between two adjacent assembly holes 112. This can not only ensure the number of fixing rods to ensure the structural stability of the iron core body 10, but also ensure the number of dielectric flow channels to ensure the flow rate of the heat exchange medium flowing through the iron core body 10 per unit time.

[0065] Refer to Figure 3 and Figure 4 As shown, in some embodiments, the iron core laminate 11 includes a plurality of arc-shaped laminate monomers 12, and the plurality of sequentially connected laminate monomers 12 constitute the iron core laminate 11. The iron core laminate 11 is formed by sequentially connecting a plurality of laminate monomers 12, which can reduce the manufacturing cost of the iron core laminate 11.

[0066] Exemplarily, refer to Figure 3 and Figure 4 As shown, in some embodiments of the present application, taking the iron core laminate 11 manufactured by a blanking process as an example for illustration. In some embodiments of the present application, an operator punches a plurality of laminate monomers 12 in a raw sheet of a certain size, and then sequentially connects the plurality of laminate monomers 12 to form the iron core laminate 11. Compared with directly punching an integrally formed iron core laminate 11 in a raw sheet of a certain size, the loss rate of the raw sheet is lower in this way. It should be noted that the iron core laminate 11 can also be integrally formed, which can be beneficial to improving the structural strength of the iron core laminate 11 and can also omit the step of assembling a plurality of laminate monomers 12 to form the iron core laminate 11.

[0067] Refer to Figure 4As shown, in some embodiments, along the arc length direction of the lamination unit 12, a first assembly portion 121 is formed at one end of the lamination unit 12, and a second assembly portion 122 is formed at the other end of the lamination unit 12. In two adjacent lamination units 12, the first assembly portion 121 of one lamination unit 12 is matingly connected with the second assembly portion 122 of the other lamination unit 12, so that a plurality of lamination units 12 are sequentially connected and combined to form a core lamination 11.

[0068] Referring to Figure 4 and Figure 3 As shown, exemplarily, the core lamination 11 is sequentially composed of four identical lamination units 12, and the four lamination units 12 include a first lamination unit 12a, a second lamination unit 12b, a third lamination unit 12c, and a fourth lamination unit 12d. During the process of assembling the four lamination units 12 to form the core lamination 11, the first assembly portion 121 of the first lamination unit 12 is assembled and mated with the second assembly portion 122 of the second lamination unit 12, the first assembly portion 121 of the second lamination unit 12 is assembled and mated with the second assembly portion 122 of the third lamination unit 12, the first assembly portion 121 of the third lamination unit 12 is assembled and mated with the second assembly portion 122 of the fourth lamination unit 12d, and the first assembly portion 121 of the fourth lamination unit 12d is assembled and mated with the second assembly portion 122 of the first lamination unit 12, so that the first lamination unit 12a, the second lamination unit 12b, the third lamination unit 12c, and the fourth lamination unit 12d are sequentially connected to form the core lamination 11.

[0069] Referring to Figure 4 As shown, the first assembly portion 121 is one of a clamping protrusion 123 and a clamping notch 124, the second assembly portion 122 is the other of the clamping protrusion 123 and the clamping notch 124, and the clamping protrusion 123 is in clamping fit with the clamping notch 124. It can also be understood that in one lamination unit 12, when the first assembly portion 121 is the clamping protrusion 123, the second assembly portion 122 is the clamping notch 124, or when the first assembly portion 121 is the clamping notch 124, the second assembly portion 122 is the clamping notch 124. The two lamination units 12 are connected through the clamping fit between the clamping protrusion 123 and the clamping notch 124, thereby achieving the effect of assembling a plurality of lamination units 12 to form a core lamination 11.

[0070] In some other embodiments, along the arc length direction of the lamination unit 12, a first welding edge is formed at one end of the lamination unit 12, and a second welding edge is formed at the other end of the lamination unit 12. In two adjacent lamination units 12, the first welding edge of one lamination unit 12 is welded to the second welding edge of the other lamination unit 12, so that a plurality of lamination units 12 are sequentially connected and combined to form a core lamination 11.

[0071] Refer to Figure 1 and Figure 2 As shown, in some embodiments, the inner tooth portion 10b has a plurality of inner teeth 113 arranged in sequence along the circumferential direction of the inner tooth portion 10b. A first assembly space is formed between two adjacent inner teeth 113 for accommodating the stator winding. The outer tooth portion 10c has a plurality of outer teeth 114 arranged in sequence along the circumferential direction of the outer tooth portion 10c. A second assembly space is formed between two adjacent outer teeth 114 for accommodating the stator winding.

[0072] Exemplarily, refer to Figure 1 the stator 100 shown. The stator 100 includes a stator core 1, a first stator winding 110, and a second stator winding 120. The first stator winding 110 is assembled on the inner tooth portion 10b, and the second stator winding 120 is assembled on the outer tooth portion 10c. Taking the metal wires of both the first stator winding 110 and the second stator winding 120 as flat copper wires as an example, both the first assembly space and the second assembly space are wire grooves, so that the flat copper wires can pass through the first assembly space and the second assembly space, thereby achieving the effect of assembling the first stator winding 110 on the inner tooth portion 10b and the second stator winding 120 on the outer tooth portion 10c.

[0073] In some embodiments, along the radial direction of the core body 10, the first assembly space and the second assembly space are correspondingly arranged along the same radial line, thereby achieving the effect of reducing the magnetic path. At the same time, the thickness dimension of the yoke portion can also be further reduced (which can also be understood as the dimension in the radial direction), so as to reduce the weight of the core body 10, realize the light weight of the motor, and at the same time reduce the magnetic path of the yoke portion, with high efficiency and reduced electromagnetic loss.

[0074] In other embodiments, taking the metal wires of both the first stator winding 110 and the second stator winding 120 as round copper wires as an example, the round copper wires of the first stator winding 110 are wound around the inner teeth 113, and the round copper wires of the second stator winding 120 are wound around the outer teeth 114, thereby achieving the effect of assembling the first stator winding 110 on the inner tooth portion 10b and the second stator winding 120 on the outer tooth portion 10c.

[0075] Refer to Figure 1 shown. The stator 100 provided in some embodiments of the present application, the stator 100 includes a stator core 1, a first stator winding 110, and a second stator winding 120, wherein the stator core 1 is the stator core 1 in the above-mentioned some embodiments, the first stator winding 110 is assembled on the inner tooth portion 10b, and the second stator winding 120 is assembled on the outer tooth portion 10c.

[0076] For the stator 100 with the stator core 1 of the present application, during the working process of the stator 100 in an electric machine, since the inner tooth part 10b is arranged inside the yoke part, the outer tooth part 10c is arranged outside the yoke part, and the medium flow channel is arranged in the yoke part, during the process of the heat exchange medium flowing through the medium flow channel, the heat exchange medium simultaneously absorbs the heat generated by the first stator winding 110 arranged on the inner tooth part 10b and the heat generated by the second stator winding 120 arranged on the outer tooth part 10c through the iron core body 10, achieving the effect of simultaneously cooling the first stator winding 110 and the second stator winding 120.

[0077] Referring to Figure 1 As shown, the electric machine provided by some embodiments of the present application includes a stator 100, a first rotor, and a second rotor. The stator 100 is the stator 100 in the above-mentioned some embodiments. Along the radial direction of the stator 100, the stator 100 is sleeved outside the first rotor, and the second rotor is sleeved outside the stator 100, which can effectively reduce the axial dimension of the electric machine, thereby meeting the requirement of miniaturization of the electric machine.

[0078] In some embodiments, the first stator winding 110 and the second stator winding 120 in the stator 100 are connected so that the first stator winding 110 and the second stator winding 120 are electrically connected simultaneously. In this way, the electric machine can use one controller to control the current flowing through the first stator winding 110 and the second stator winding 120 simultaneously, thereby achieving the effect of simultaneously controlling the first rotor and the second rotor to work simultaneously, so that the torque density of the electric machine is high and the output torque is effectively improved.

[0079] In another embodiment, the first stator winding 110 and the second stator winding 120 in the stator 100 are independent of each other. It can also be understood that the first stator winding 110 and the second stator winding 120 are in an unconnected state. In this way, the electric machine can use two controllers to control the current flowing through the first stator winding 110 and the current flowing through the second stator winding 120 respectively, thereby achieving the effect of the first rotor and the second rotor working separately. For example, parameters such as the rotational speed and rotation direction of the first rotor and the second rotor can be different.

[0080] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered to be within the scope described in this specification.

[0081] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A stator core (1), characterized in that: include: An iron core body (10), the iron core body (10) comprising a cylindrical yoke portion, an inner tooth portion (10b) and an outer tooth portion (10c), wherein along the radial direction of the yoke portion, an inner peripheral wall of the yoke portion is connected to the inner tooth portion (10b), and an outer peripheral wall of the yoke portion is connected to the outer tooth portion (10c); At least one medium flow channel is formed in the yoke, and the medium flow channel is used to allow a heat exchange medium to flow in, so that the heat exchange medium and the iron core body (10) can exchange heat.

2. The stator core (1) according to claim 1, characterized in that: Along the flow direction of the medium flow channel, a first port and a second port are formed at both ends of the medium flow channel; along the axial direction of the yoke, the yoke has a first end face and a second end face facing oppositely; wherein: The first port is located at the first end surface, and the second port is located at the second end surface, or the first port and the second port are both located at the first end surface, or the first port and the second port are both located at the second end surface.

3. The stator core (1) according to claim 1, characterized in that: The number of the medium flow channels is configured to be multiple, the multiple medium flow channels are arranged in sequence along the circumference of the yoke, and two adjacent medium flow channels are arranged at intervals; It also includes: a connecting pipe (134), wherein the connecting pipe (134) is used to connect two adjacent medium flow channels.

4. The stator core (1) according to any one of claims 1 to 3, characterized in that: The iron core body (10) comprises a plurality of iron core laminations (11), wherein the plurality of iron core laminations (11) are stacked in sequence to form the iron core body (10); The core laminations (11) comprise a sub-yoke portion (11a), a sub-inner tooth portion (11b) and a sub-outer tooth portion (11c); along the radial direction of the core laminations (11), the inner edge of the sub-yoke portion (11a) is connected to the sub-inner tooth portion (11b), and the outer edge of the sub-yoke portion (11a) is connected to the sub-outer tooth portion (11c); a plurality of the core laminations (11) are stacked in sequence, so that a plurality of the sub-yoke portions (11a) are stacked to form the yoke portion, a plurality of the sub-inner tooth portions (11b) form the inner tooth portion (10b), and a plurality of the sub-outer tooth portions (11c) form the outer tooth portion (10c); The sub-yoke portion (11a) is formed with an assembly hole (112); along the axial direction of the core body (10), the assembly holes (112) of two adjacent core laminations (11) are connected, and a plurality of assembly holes (112) connected in sequence constitute an assembly channel (11d) of the core body (10); It also includes: a fixing rod, the fixing rod being assembled in the assembly channel (11d), the fixing rod being used to fix a plurality of sequentially stacked core laminations (11); The sub-yoke portion (11a) is formed with a medium through hole (111); in the core body (10), the medium through holes (111) of two adjacent core laminations (11) are connected, and a plurality of sequentially connected medium through holes (111) constitute the medium flow channel.

5. The stator core (1) according to claim 4, characterized in that: The number of the assembly holes (112) and the number of the medium through holes (111) are both configured as a plurality, and the plurality of assembly holes (112) and the plurality of medium through holes (111) are arranged in sequence along the circumferential direction of the sub-yoke portion (11a).

6. The stator core (1) according to claim 4, characterized in that: The core lamination (11) comprises a plurality of arc-shaped lamination monomers (12), and a plurality of the lamination monomers (12) connected in sequence constitute the core lamination (11).

7. The stator core (1) according to claim 6, characterized in that: Along the arc length direction of the laminated monomer (12), a first assembly portion (121) is formed at one end of the laminated monomer (12), and a second assembly portion (122) is formed at the other end of the laminated monomer (12); In the two connected laminated monomers (12), the first assembly portion (121) of one laminated monomer (12) is cooperatively connected with the second assembly portion (122) of the other laminated monomer (12).

8. The stator core (1) according to claim 7, characterized in that: The first assembly portion (121) is one of the clamping protrusion (123) and the clamping notch (124), the second assembly portion (122) is the other of the clamping protrusion (123) and the clamping notch (124), and the clamping protrusion (123) is clamped and matched with the clamping notch (124).

9. A stator (100), characterized in that: include: A stator core (1), wherein the stator core (1) is a stator core (1) according to any one of claims 1 to 8; A first stator winding (110) and a second stator winding (120), wherein the first stator winding (110) is mounted on the inner tooth portion (10b), and the second stator winding (120) is mounted on the outer tooth portion (10c).

10. A motor, characterized in that: include: A stator (100), the stator (100) being the stator (100) according to claim 9; A first rotor and a second rotor, the stator (100) being sleeved on the outside of the first rotor, and the second rotor being sleeved on the outside of the stator (100).

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