Motor

Abstract

The utility model discloses a motor, comprising a hollow shaft, the inside of which is used for liquid feeding; the plurality of groups of silicon steel sheets are arranged around the hollow shaft, each group of silicon steel sheets is provided with a plurality of magnetic steel grooves, magnetic steel is arranged in the magnetic steel grooves, gaps are formed between the inner walls of the magnetic steel grooves and the magnetic steel, and the corresponding gaps of the plurality of groups of silicon steel sheets are in one-to-one correspondence and are communicated in the axial direction so as to form a plurality of cooling channels extending in the axial direction; the first end cover is provided with a plurality of first liquid inlet parts, and the first liquid inlet parts communicate with the hollow shaft; the second end cover and the first end cover are located on the two axial sides of the multiple sets of silicon steel sheets, the second end cover is provided with a plurality of first liquid outlet parts, and the multiple first liquid outlet parts communicate with the cooling channel in the axial direction; a cooling medium can sequentially flow through the first liquid inlet part, the cooling channel and the first liquid outlet part and flows out of the second end cover through the first liquid outlet part. The motor provided by the utility model can effectively cool the rotor, thereby effectively reducing the heat loss and improving the working efficiency of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motor cooling, in particular to a motor. Background Art

[0002] The motor is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. It is an indispensable power device in actual industrial manufacturing. The stator and rotor are the more important components of the motor. The stator is the fixed part of the motor, on which there are multiple permanent magnets with DC excitation, so that a magnetic field can be generated; the rotor is the rotating part of the motor, on which there is an armature winding. Under the action of the armature winding, the current can generate a magnetic field that interacts with the stator magnetic field, thereby generating an electromagnetic force to drive the motor to operate.

[0003] With the development of electric drive technology, the speed of motors is getting higher and higher. However, in the current motor cooling scheme, only the stator of the motor is cooled (such as oil cooling, water cooling, etc.), but the rotor is not cooled. Therefore, a high amount of heat is generated inside the rotor, and this heat cannot be dissipated quickly. When the rotor temperature rises to a certain level, it is likely to cause the permanent magnet to demagnetize, causing permanent damage to the motor. Utility Model Content

[0004] The utility model aims to solve the technical problem that the existing motor cooling solution only cools the stator but not the rotor. The utility model provides a motor that can effectively cool the rotor, has a simple cooling structure, can effectively reduce heat loss, and improve the working efficiency of the motor.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses a motor, comprising:

[0006] Hollow shaft, the interior of which is used for circulating cooling medium;

[0007] A plurality of groups of silicon steel sheets are arranged around the hollow shaft, each group of the silicon steel sheets is provided with a plurality of magnetic steel grooves, magnetic steel is arranged in the magnetic steel grooves, a gap is formed between the inner wall of the magnetic steel groove and the magnetic steel, and along the axial direction, the corresponding gaps of the plurality of groups of silicon steel sheets correspond to each other and are connected to form a plurality of cooling channels extending along the axial direction;

[0008] A first end cover, provided with a plurality of first liquid inlet portions, wherein the plurality of first liquid inlet portions are in communication with the hollow shaft;

[0009] A second end cover, wherein the second end cover and the first end cover are located on both sides of the plurality of groups of silicon steel sheets in the axial direction, and the second end cover is provided with a plurality of first liquid outlets, and along the axial direction, the plurality of first liquid outlets are in communication with the cooling channel;

[0010] The cooling medium can flow through the first liquid inlet, the cooling channel, and the first liquid outlet in sequence, and flow out of the second end cover from the first liquid outlet.

[0011] By adopting the above technical scheme, the rotor (multiple groups of silicon steel sheets) in the motor of the embodiment of the present application is provided with multiple magnetic steel slots, and the inner wall of each magnetic steel slot can form a gap with the magnetic steel therein, so that the gaps of the multiple groups of silicon steel sheets can be connected axially to form multiple cooling channels; based on this, multiple first liquid inlets are arranged on the end face of the first end cover facing the silicon steel sheets, and multiple first liquid outlets are arranged on the end face of the second end cover facing the first end cover, and the first liquid inlets, magnetic steel slots (that is, multiple cooling channels), and first liquid outlets correspond to each other.

[0012] When the motor is running (for example, the rotor rotates clockwise, or counterclockwise), the cooling medium in the hollow shaft can flow into the first liquid inlet portion of the first end cover. During this process, the cooling medium in the first liquid inlet portion flows to the above-mentioned cooling channel, that is, the cooling medium in the first liquid inlet portion flows to the gap between the silicon steel sheets corresponding thereto, and then flows into the first liquid outlet portion of the second end cover through the cooling channel, and finally flows out of the second end cover through the first liquid outlet portion.

[0013] That is, the cooling medium can enter the rotor along the first liquid inlet of the first end cover, flow through the rotor (for example, flow through the rotor axially), and then enter the first liquid outlet of the second end cover, and be thrown out of the second end cover through the first liquid outlet of the first liquid outlet (described later, exemplarily, the first liquid outlet is an oil throwing hole). In this process, the motor of the embodiment of the present application achieves effective cooling of the rotor (multiple groups of silicon steel sheets), avoids the demagnetization of the permanent magnet of the rotor caused by the high rotor temperature in the existing solution, effectively reduces the heat loss of the motor, and improves the working efficiency of the motor.

[0014] That is to say, the embodiment of the present application designs multiple cooling paths between the first end cover, the multiple groups of silicon steel sheets, and the second end cover, so that the cooling medium can flow through the cooling path, thereby dissipating heat from the multiple groups of silicon steel sheets. At the same time, after the cooling medium flows out of the cooling path (i.e., after flowing out of the second end cover), it will continue to flow to the stator winding under the action of the centrifugal force of the motor, further cooling the stator. The motor of the embodiment of the present application also realizes the cooling of the rotor (i.e., the multiple groups of silicon steel sheets) and the stator at the same time with a relatively simple and compact cooling structure.

[0015] According to another specific embodiment of the utility model, the first end cover is further provided with a plurality of second liquid outlets, and along the axial direction, the plurality of second liquid outlets are communicated with the cooling channel; the second end cover is further provided with a plurality of second liquid inlets, and the plurality of second liquid inlets are communicated with the hollow shaft;

[0016] The cooling medium can flow through the second liquid inlet, the cooling channel, and the second liquid outlet in sequence, and flow out of the first end cover from the second liquid outlet.

[0017] By adopting the above technical solution, the motor of the embodiment of the present application can also be provided with a second cooling path. A plurality of second liquid outlets are provided on the end surface of the first end cover facing the silicon steel sheet, and a plurality of second liquid inlets are provided on the end surface of the second end cover facing the first end cover, and the second liquid inlets, the plurality of cooling channels, and the second liquid outlets correspond to each other.

[0018] When the motor is running (for example, rotating clockwise, or for example, the rotor rotates counterclockwise), the cooling medium in the hollow shaft can flow into the second liquid inlet portion of the second end cover. During this process, the cooling medium in the second liquid inlet portion flows to the corresponding cooling channel, and then flows into the second liquid outlet portion of the second end cover from the cooling channel, and finally flows out of the first end cover from the second liquid outlet portion.

[0019] The motor of the embodiment of the present application includes a corresponding cooling path regardless of whether it rotates counterclockwise or clockwise, and the fluidity of the cooling medium in the cooling path is not affected by the rotation direction of the motor. The motor of the embodiment of the present application achieves effective cooling of multiple groups of silicon steel sheets, reduces the heat loss of the motor, and effectively improves the working efficiency of the motor.

[0020] At the same time, after the cooling medium flows out of the cooling path (ie, flows out of the first end cover), it will continue to flow toward the stator winding under the action of the centrifugal force of the motor to further cool the stator.

[0021] According to another specific embodiment of the utility model, along the circumference of the first end cover, the first liquid inlet portion and the second liquid outlet portion are spaced apart and staggered; along the circumference of the second end cover, the second liquid inlet portion and the first liquid outlet portion are spaced apart and staggered.

[0022] By adopting the above technical scheme, a plurality of first liquid inlets and second liquid outlets are arranged at intervals and alternately on the first end cover, and a plurality of second liquid inlets and first liquid outlets are arranged at intervals and alternately on the second end cover. The plurality of first liquid inlets of the first end cover correspond to the plurality of first liquid outlets of the second end cover, and the plurality of second liquid outlets of the first end cover correspond to the plurality of second liquid inlets of the second end cover. Thus, the motor of the embodiment of the present application includes a plurality of cooling paths, which can increase the heat exchange area of ​​the rotor (a plurality of silicon steel sheets) and improve the cooling efficiency.

[0023] According to another specific embodiment of the present utility model, the first liquid inlet portion is provided on a side of the first end cover facing the silicon steel sheet, and the first liquid inlet portion includes a first slot, wherein:

[0024] The first slot includes a first slot, a second slot and a third slot that are connected;

[0025] The third groove extends along the extension direction of the first straight line, the first groove and the second groove are connected at an angle, one end of the third groove is connected to the hollow shaft, and the other end of the third groove is connected to the intersection of the first groove and the second groove, and along the axial direction, at least a portion of the first groove and the second groove are connected to the corresponding cooling channel.

[0026] According to another specific embodiment of the present utility model, the first straight line of each of the third grooves intersects at the center of the first end cover, and the first straight lines of adjacent third grooves are perpendicular to each other.

[0027] According to another specific embodiment of the present invention, the first slot is Y-shaped.

[0028] According to another specific embodiment of the utility model, the first liquid outlet is provided on a side of the second end cover facing the first end cover, and the first liquid outlet includes a second slot, wherein:

[0029] The second slot includes a fourth slot and a fifth slot that are connected to each other. A first liquid outlet is provided at one end of each of the fourth slot and the fifth slot. The first liquid outlet is provided at the edge of the second end cover so that the cooling medium can flow into the second slot through the first slot and the cooling channel in sequence and then flow out of the second end cover through the first liquid outlet.

[0030] According to another specific embodiment of the present invention, the width of any one or more of the first slot, the second slot, the fourth slot, and the fifth slot matches the width of the corresponding magnetic steel slot to cover the gap.

[0031] According to another specific embodiment of the present invention, a width narrowing portion is provided at a corresponding position of any one or more of the first slot, the second slot, the fourth slot, and the fifth slot and the corresponding magnetic steel to abut against the magnetic steel.

[0032] According to another specific embodiment of the present invention, the second groove is V-shaped. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The three-dimensional diagram of the motor of the utility model is shown Figure 1 .

[0034] Figure 2 An exploded view of a motor according to an embodiment of the utility model is shown; wherein, six groups of silicon steel sheets are shown in the figure, and the first end cover and the second end cover are omitted.

[0035] Figure 3A front view of a silicon steel sheet according to an embodiment of the utility model is shown.

[0036] Figure 4a The three-dimensional diagram of the motor of the utility model is shown Figure 2 ; Among them, the figure shows the first liquid inlet and the second liquid outlet of the first end cover, and six groups of silicon steel sheets are omitted.

[0037] Figure 4b The three-dimensional diagram of the motor of the utility model is shown Figure 3 ; Among them, the figure shows the first liquid outlet and the second liquid inlet of the second end cover, and six groups of silicon steel sheets are omitted.

[0038] Figure 5 A stereoscopic diagram 4 of the motor according to an embodiment of the utility model is shown; wherein the diagram shows two cooling paths, each cooling path includes four cooling channels, and six groups of silicon steel sheets are omitted.

[0039] Figure 6a A front view of a first end cover of an embodiment of the utility model is shown; wherein the figure shows a first liquid inlet portion and a second liquid outlet portion of the first end cover.

[0040] Figure 6b A front view of the second end cover of an embodiment of the utility model is shown; wherein the figure shows a first liquid outlet and a second liquid inlet of the second end cover.

[0041] Figure 7 The three-dimensional diagram of the motor of the utility model is shown Figure 5 ; Among them, the shaded part in the figure shows four cooling channels, and five groups of silicon steel sheets are omitted. DETAILED DESCRIPTION

[0042] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0043] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0044] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0045] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0046] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0047] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] See also Figure 1 An embodiment of the present application provides a motor 1, including a hollow shaft 10, a rotor, a first end cover 20 and a second end cover 30.

[0049] The rotor of the embodiment of the present application includes six groups of silicon steel sheets 40, each group of silicon steel sheets 40 is formed by stacking a plurality of thin sheets (i.e., thinner silicon steel sheets). The embodiment of the present application does not limit the number of thin sheets in each group of silicon steel sheets 40, and the number is selected according to the actual application of the motor. Figure 1 Six groups of silicon steel sheets 40 are shown by way of example, but the embodiment of the present application does not limit the number of groups of silicon steel sheets 40. For example, the motor 1 of the embodiment of the present application may also include three, four, seven, or other groups of silicon steel sheets 40.

[0050] Continue reading Figure 1 The first end cover 20 and the second end cover 30 are respectively arranged in the axial direction of the six groups of silicon steel sheets 40 (such as Figure 1That is, the first end cover 20 and the second end cover 30 are respectively connected to two groups of silicon steel sheets 40 located on both sides of the axial direction among the six groups of silicon steel sheets 40.

[0051] like Figure 1 As shown, for example, the first end cover 20 is arranged on the right side in the axial direction (i.e. Figure 1 The second end cover 30 is arranged on the right side of a group of silicon steel sheets 40 on the side indicated by the Z2 direction in the figure, and the second end cover 30 is arranged on the left side in the axial direction in the figure (i.e. Figure 1 The left side of another group of silicon steel sheets 40 (the side indicated by the Z1 direction in FIG. 1 ). However, this is only Figure 1 In a possible embodiment shown, the first end cover 20 can also be arranged on the left side of a group of silicon steel sheets 40 axially located on the left side of the figure, while the second end cover 30 is arranged on the right side of a group of silicon steel sheets 40 axially located on the right side of the figure.

[0052] That is to say, the embodiment of the present application does not limit the arrangement positions of the first end cover 20 and the second end cover 30. In other words, the first end cover 20 can be the front end cover of the motor 1, and the second end cover 30 can be the rear end cover of the motor 1, or the first end cover 20 can be the rear end cover of the motor 1, and correspondingly, the second end cover 30 can be the front end cover of the motor 1.

[0053] See also Figure 1 and Figure 4a The hollow shaft 10 of the embodiment of the present application includes a first end 1011 and a second end 1012 , and the first end 1011 and the second end 1012 are arranged opposite to each other along the axial direction.

[0054] The six groups of silicon steel sheets 40 are located between the first end 1011 and the second end 1012 and are arranged around the hollow shaft 10. The first end cover 20 and the second end cover 30 are respectively arranged at both ends of the hollow shaft 10. Figure 1 As shown, the first end 1011 and the second end cover 30 are located on the same side (i.e. Figure 1 The second end 1012 and the first end cover 20 are located on the same side (ie, Figure 1 In other words, the first end 1011 may be located on the same side as the first end cap 20, and the second end 1012 may be located on the same side as the second end cap 30.

[0055] Exemplarily, the cooling medium may be cooling oil or insulating coolant. The embodiments of the present application do not limit the cooling medium. As long as the fluid can achieve the cooling function and is insulating, it falls within the protection scope of the embodiments of the present application.

[0056] Continue reading Figure 1 and Figure 4a, illustratively, the first end 1011 of the hollow shaft 10 is provided with a through hole 10111, and the through hole 10111 is used to introduce a cooling medium into the hollow shaft 10. That is to say, after a small amount of cooling medium flows into the hollow shaft 10 from the first end 1011, the cooling medium will be laid on most of the inner wall of the hollow shaft 10 due to the dynamic balance of the motor during operation. Therefore, the cooling medium on the inner wall of the hollow shaft 10 can simultaneously supply liquid to the first end cover 20 (i.e., the first liquid inlet portion to be described later) and the second end cover 30 (i.e., the second liquid inlet portion, the second liquid inlet portion has the same arrangement and structure as the first liquid inlet portion to be described in detail later). At this time, the second end 1012 is closed.

[0057] For example, a through hole for introducing a cooling medium may be provided at the second end 1012 of the hollow shaft 10, while the first end 1011 may be a closed structure. The present application embodiment does not limit this, and it may be selected according to the actual application of the motor.

[0058] See also Figure 2 and Figure 3 , Figure 2 The exploded view of six groups of silicon steel sheets 40 is shown as an example. Figure 3 A front view of one group of silicon steel sheets 40 is shown as an example, and the structures of the other five groups of silicon steel sheets 40 are the same.

[0059] It can be seen that each group of silicon steel sheets 40 includes eight groups of first magnetic steel slot groups 400 and eight groups of second magnetic steel slot groups 410. Each group of first magnetic steel slot groups 400 (such as Figure 3 The first magnetic steel slot 401 and the second magnetic steel slot 411 are axially oriented (as shown in the dashed line portion T). Figure 2 The Z direction shown in FIG. 1 ) penetrates the silicon steel sheet 40 .

[0060] The embodiment of the present application does not limit the number of the first magnetic steel slot groups 400 and the second magnetic steel slot groups 410. Six, eight, or ten first magnetic steel slot groups 400 and second magnetic steel slot groups 410 may be provided, respectively.

[0061] In a possible implementation, the embodiment of the present application takes the implementation of a cooling scheme based on the first magnetic steel slot group 400 (as described later) as an example. Therefore, this document only describes the structure of the first magnetic steel slot 401 in detail, and does not elaborate on the second magnetic steel slot group 410. However, it should be noted that the cooling scheme of the embodiment of the present application can also be applied to the second magnetic steel slot group 410, and the structure and cooling scheme principle of the second magnetic steel slot group 410 can refer to the first magnetic steel slot group 400.

[0062] See also Figure 3The two first magnetic steel slots 401 in each first magnetic steel slot group 400 are arranged along a first straight line (such as Figure 3 For example, the extension direction of the first straight line may be parallel to the radial direction of the silicon steel sheet (eg, Figure 3 Y direction shown in FIG.

[0063] Continue reading Figure 3 , the first magnetic steel slot 401 and the second magnetic steel slot 411 are both provided with magnetic steel 402, for ease of understanding, Figure 3 Only a portion of the magnetic steel 402 is shown as an example.

[0064] See also Figure 3 Combined with Figure 2 A gap 4000 is formed between the inner wall of the first magnetic steel slot 401 and the corresponding magnetic steel 402, and the gap 4000 is axially (such as Figure 2 The Z direction shown in FIG. 4A ) penetrates the corresponding silicon steel sheet 40. The gap 4000 is used for the cooling medium to flow in.

[0065] Therefore, see Figure 2 Combined with Figure 1 and Figure 5 After the motor 1 is assembled, the corresponding gaps 4000 of the six groups of silicon steel sheets 40 correspond to each other and are connected to form a Figure 5 The multiple cooling channels shown in FIG. Figure 5 The cooling channels 50 shown are in a solid form, and each cooling channel 50 extends in the axial direction. That is, in the axial direction, every six one-to-one corresponding gaps 4000 can form a cooling channel 50.

[0066] See also Figures 2 to 5 , each group of first magnetic steel slot groups 400 of the embodiment of the present application includes four gaps 4000 (each first magnetic steel slot 401 includes two gaps 4000), therefore, each group of silicon steel sheets 40 includes thirty-two gaps 4000, and since the gaps 4000 corresponding to the six groups of silicon steel sheets 40 correspond to each other and are connected along the axial direction, the motor 1 of the embodiment of the present application includes thirty-two cooling channels 50. However, the embodiment of the present application does not limit the number of cooling channels 50.

[0067] Based on this, see Figure 4a and Figure 4b , Figure 4a and Figure 4b The first end cover 20 and the second end cover 30 are exemplarily shown as being arranged opposite to each other in the axial direction, wherein: Figure 4a and Figure 4b Six groups of silicon steel sheets are omitted. Figure 4a is the viewing angle of the first end cover 20, Figure 4b This is the viewing angle of the second end cover 30.

[0068] See also Figure 4a and Figure 6a , Figure 6a The front view of the first end cover 20 is shown as an example. It can be seen that the first end cover 20 is provided with four first liquid inlet portions 201, and each first liquid inlet portion 201 is communicated with the hollow shaft 10 on which the hollow shaft 10 is provided.

[0069] The embodiment of the present application does not limit the number of the first liquid inlet parts 201, and can be set to three, four, five, etc. As long as they can achieve liquid inlet and correspond to the first liquid outlet part 302, they all fall within the protection scope of the embodiment of the present application.

[0070] See also Figure 4b and Figure 6b Combined with Figure 5 , Figure 6b The front view of the second end cover 30 is shown as an example. It can be seen that the second end cover 30 is provided with four first liquid outlets 302, which are arranged along the axial direction (such as Figure 5 In the Z direction shown in FIG, each first liquid outlet portion 302 is connected to the above-mentioned cooling channel 50.

[0071] The embodiment of the present application does not limit the number of the first liquid outlets 302 , and can be set to three, four, five, etc., for example. As long as the liquid can be discharged and correspond to the cooling channel 50 and the first liquid inlet 201 , they are within the protection scope of the embodiment of the present application.

[0072] See also Figure 7 , Figure 7 An implementation of the cooling solution of the motor 1 of the embodiment of the present application is exemplarily shown. For the sake of convenience, only one group of silicon steel sheets 40 and part of the cooling channels 50 are shown. According to the above description, each first magnetic steel slot 401 includes two gaps 4000, and each group of first magnetic steel slots includes four gaps 4000. Therefore, each first liquid outlet 302 can correspond to four cooling channels 50 along the axial direction. Figure 7 FIG. 4 shows an exemplary embodiment of four cooling channels 50 in a group of first channel steel slots, such as Figure 7 The shaded area is shown in Figure 2. Figures 4a to 7 The cooling medium in the hollow shaft 10 can flow from the first liquid inlet 201 into the corresponding cooling channel 50 , then flow from the cooling channel 50 into the corresponding first liquid outlet 302 , and finally flow out of the second end cover 30 from the first liquid outlet 302 .

[0073] It should be noted that in the embodiment of the present application, the first liquid inlet portion 201 of the first end cover 20 needs to correspond to the first liquid outlet portion 302 of the second end cover 30, or the second liquid outlet portion 202 of the first end cover 20 needs to correspond to the second liquid inlet portion 301 of the second end cover 30.

[0074] By adopting the above technical scheme, the six groups of silicon steel sheets 40 in the motor 1 of the embodiment of the present application are provided with a plurality of magnetic steel grooves 401 (for example, the above-mentioned first magnetic steel grooves 401), and the inner wall of each first magnetic steel groove 401 can form a gap 4000 with the magnetic steel 402 therein, so that the gaps 4000 of the six groups of silicon steel sheets 40 can be connected along the axial direction to form a plurality of cooling channels 50; based on this, a plurality of first liquid inlet portions 201 are arranged on the end surface of the first end cover 20 facing the silicon steel sheet, and a plurality of first liquid outlet portions 302 are arranged on the end surface of the second end cover 30 facing the first end cover 20, and the first liquid inlet portion 201, the first magnetic steel groove 401 (that is, the plurality of cooling channels 50), and the first liquid outlet portion 302 correspond to each other.

[0075] When the motor 1 is running (for example, rotating counterclockwise), the cooling medium in the hollow shaft 10 of the hollow shaft 10 can flow into the first liquid inlet 201 of the first end cover 20. In this process, the cooling medium in the first liquid inlet 201 flows to the gap 4000 of the silicon steel sheet 40 corresponding thereto, that is, the cooling medium in the first liquid inlet 201 flows to the above-mentioned cooling channel 50, and then flows into the first liquid outlet 302 of the second end cover 30 through the cooling channel 50, and finally flows out of the second end cover 30 through the first liquid outlet 302. In this process, the motor 1 of the embodiment of the present application realizes effective cooling of the rotor (six groups of silicon steel sheets 40), avoids the demagnetization of the rotor magnetic steel 402 caused by the high rotor temperature in the existing solution, effectively reduces the heat loss of the motor 1, and improves the working efficiency of the motor 1.

[0076] That is to say, the embodiment of the present application designs a cooling path between the first end cover 20, the six groups of silicon steel sheets 40 and the second end cover 30, so that the cooling medium can flow through the cooling path, thereby dissipating the heat of the six groups of silicon steel sheets 40. At the same time, after the cooling medium flows out of the cooling path (i.e., after flowing out of the second end cover 30), under the action of the centrifugal force of the motor 1, it will continue to flow to the stator winding (not shown in the figure), further cooling the stator. The motor 1 of the embodiment of the present application also realizes the cooling of the rotor (i.e., the six groups of silicon steel sheets 40) and the stator at the same time with a relatively simple and compact cooling structure.

[0077] See also Figure 4a and Figure 6a Combined with Figure 5 In a possible implementation manner, the first end cover 20 is further provided with four second liquid outlets 202. It can be seen that along the axial direction (such as Figure 5 Each second liquid outlet 202 is connected to the cooling channel 50.

[0078] The embodiment of the present application does not limit the number of the second liquid outlet 202, and can be set to three, four, five, etc. As long as the liquid can be discharged and corresponds to the cooling channel 50 and the first liquid inlet 201, it belongs to the protection scope of the embodiment of the present application.

[0079] See also Figure 4b and Figure 6b The second end cover 30 is further provided with four second liquid inlet portions 301 , and each second liquid inlet portion 301 is communicated with the above-mentioned hollow shaft 10 .

[0080] The embodiment of the present application does not limit the number of the second liquid inlet parts 301, and can be set to three, four, five, etc. As long as they can achieve liquid inlet and correspond to the second liquid outlet part 202, they belong to the protection scope of the embodiment of the present application.

[0081] See also Figure 7 Combined with Figure 4a , Figure 4b and Figure 5 The cooling medium on the inner wall of the hollow shaft 10 can flow from the second liquid inlet 202 into the corresponding cooling channel 50 , then flow from the cooling channel 50 into the corresponding second liquid outlet 202 , and finally flow out of the first end cover 20 from the second liquid outlet 202 .

[0082] It should be noted that the present application includes but is not limited to three embodiments. In the first embodiment, the first end cover 20 is only provided with the first liquid inlet 201, and the second end cover 30 is only provided with the corresponding first liquid outlet 302. In the second embodiment, the first end cover 20 is only provided with the second liquid outlet 202, and the second end cover 30 is only provided with the corresponding second liquid inlet 301. The first embodiment and the second embodiment can be selected according to the actual application of the motor 1.

[0083] In the third embodiment, the first end cover 20 is provided with a first liquid inlet 201 and a second liquid outlet 202 at the same time, and the first liquid inlet 201 and the second liquid outlet 202 are spaced and staggered along the circumference of the first end cover; the second end cover is provided with a second liquid inlet 301 and a first liquid outlet 302 at the same time, and the second liquid inlet 301 and the first liquid outlet 302 are spaced and staggered along the circumference of the second end cover, and at the same time, the first liquid inlet 201 corresponds to the first liquid outlet 302, and the second liquid inlet 301 corresponds to the second liquid outlet 202. This article takes the third embodiment as an example for description.

[0084] First, the first liquid inlet portion 201 in the first end cover 20 is described in detail below.

[0085] See also Figure 6a Combined with Figure 4aIn a possible implementation, the first liquid inlet 201 is a Y-shaped groove (first groove), and the second liquid outlet 202 is a V-shaped groove. However, the embodiment of the present application does not limit the shapes of the first liquid inlet 201 and the second liquid outlet 202.

[0086] It should be noted that, see Figure 6a Combined with Figure 2 and 3 The first slot of the first liquid inlet portion 201 should cover the gap 4000 of the corresponding silicon steel sheet 40, so that the cooling medium can flow into the gap 4000 of the silicon steel sheet 40 through the first end cover 20, thereby cooling the rotor.

[0087] It should be further explained that, according to the foregoing description, in the cooling scheme of the embodiment of the present application, the first liquid inlet portion 201 of the first end cover 20 corresponds to the first liquid outlet portion of the second end cover, and the second liquid inlet portion of the second end cover corresponds to the second liquid outlet portion 202 of the first end cover. Therefore, the structure of the second liquid outlet portion 202 of the first end cover 20 is the same as the first liquid outlet portion of the second end cover, and the second liquid outlet portion 202 can refer to the description of the first liquid outlet portion of the second end cover later.

[0088] Continue reading Figure 6a Combined with Figure 4a , along the circumference of the first end cover 20 (such as Figure 6a The first liquid inlet portion 201 and the second liquid outlet portion 202 are spaced apart and staggered.

[0089] See also Figure 6a Combined with Figure 1 and Figure 4a In a possible implementation manner, the first slot of the first liquid inlet portion 201 is disposed on a side of the first end cover 20 facing the silicon steel sheet 40 (i.e. Figure 1 and Figure 4a The first slot includes a first portion 2011 and a second portion 2012 that are connected. For example, the first portion 2011 is in a straight line shape. For example, the second portion 2012 is in a V shape.

[0090] It can be seen that the second portion 2012 includes a first groove 20121 and a second groove 20122. The first groove 20121 and the second groove 20122 are connected at an angle, and the first groove 20121 and the second groove 20122 intersect at 90 degrees. Figure 6a As shown, the angle between the first slot and the second slot is the sum of angle β and angle γ, β+γ=90°. However, this is only one possible implementation. The embodiment of the present application does not limit the angle between the first slot 20121 and the second slot 20122, and can be selected according to the actual application of the motor (such as electromagnetic solution).

[0091] In one possible embodiment, the width of the first groove 20121 and the second groove 20122 matches the width of the first magnetic steel groove 401 , for example, covering the first magnetic steel groove 401 so as to cover the gap 4000 , so that the cooling medium flows in the first groove 20121 and the second groove 20122 and can flow through the gap 4000 .

[0092] The definition of matching the width of the magnetic steel slot in this article is: the width of the slot is greater than or equal to the width of the corresponding magnetic steel slot, that is, in both cases, the slot can better cover the air gap of the corresponding magnetic steel slot. However, it should be noted that the width of the slot can also be smaller than the width of the corresponding magnetic steel slot. It should be understood that although the width of the slot is smaller than the width of the corresponding magnetic steel slot, it will affect the effect of the cooling medium in the slot covering the corresponding air gap, but in this case, a small amount of cooling medium can still flow into the air gap of the corresponding magnetic steel slot, which will not affect the basic function of the motor in the embodiment of the present application. Therefore, the embodiment of the present application does not limit this.

[0093] Based on this, illustratively, only the width of the first slot 20121 may be required to match the width of the first magnetic steel slot 401, or only the width of the second slot 20122 may be required to match the width of the first magnetic steel slot 401, or the fourth slot 3021 and / or the fifth slot 3022 described later may also have a similar setting.

[0094] In a possible implementation manner, the first slot 20121 and the second slot 20122 are at positions corresponding to the magnetic steel 402 (for example, Figure 6a In the example shown, a width narrowing portion 2014 is provided in the middle of the first slot 20121 and the second slot 20122, and the width narrowing portion 2014 abuts against the magnetic steel 402 to prevent the magnetic steel 402 from completely or partially escaping from the first magnetic steel slot 401 and entering the first slot 20121 and the second slot 20122. By way of example, the width narrowing portion 2014 may also be provided only at the corresponding position of the first slot 20121 and the magnetic steel 402, or, may be provided only at the corresponding position of the second slot 20122 and the magnetic steel 402. By way of example, the fourth slot 3021 and the fifth slot 3022 described later may also have a similar arrangement. By way of example, Figure 6a As shown, the first groove 20121 is along the third straight line (such as Figure 6a The second groove 20122 extends along the fourth straight line (shown by the dashed line A). Figure 6a The third straight line A and the fourth straight line B are perpendicular to each other. Accordingly, the third straight line A and the fourth straight line B may not be perpendicular to each other, which is not limited in the embodiment of the present application and is selected according to the actual application of the motor (such as the electromagnetic solution).

[0095] Continue reading Figure 6a Combined with Figure 1 and Figure 4a , exemplarily, the first part 2011 includes a third groove 20111, and the third groove 20111 extends along the extension direction of the first straight line M. According to the foregoing, exemplarily, the first straight line M is the symmetry line of the two first magnetic steel grooves 401. The width of the third groove 20111 matches the diameter of the oil-slinging hole provided on the hollow shaft 10, for example, it is substantially equal to or slightly larger than the diameter of the oil-slinging hole, so that the cooling medium flows from the oil-slinging hole into the third groove 20111.

[0096] For example, Figure 6a As shown, the extension line of the third groove 20111 of each first groove (ie, the first straight line M) intersects at the center O of the first end cover 20. Exemplarily, the extension lines of adjacent third grooves 20111 have an angle φ1 between them, and the angle φ1=90°.

[0097] Exemplarily, the angle β between the first straight line M and the extension line A of the first slot 20121 is 45°. Exemplarily, the angle γ between the first straight line M and the extension line B of the second slot 20122 is 45°. Correspondingly, the angle between the first straight line M and the extension line A of the first slot 20121, and the angle between the first straight line and the extension line B of the second slot 20122 may also be, for example, 31°, 40°, or 42.3°. The embodiments of the present application do not limit this, and the selection is made according to the actual application of the motor (e.g., electromagnetic scheme).

[0098] See also Figure 4a and Figure 6a Combined with Figure 1 The third groove 20111 is close to the end of the hollow shaft 10 (i.e. Figure 4a and Figure 6a In other words, the end of the third groove 20111 close to the hollow shaft 10 is provided with a first liquid inlet 2013, and an oil outlet hole (not shown in the figure) is provided at a position of the hollow shaft 10 corresponding to the first liquid inlet 2013, and the first liquid inlet 2013 is connected with the oil outlet hole, so that the cooling medium in the hollow shaft 10 (for example, the cooling medium on the inner wall of the hollow shaft 10) can flow into the third groove 20111 through the first liquid inlet 2013 when the motor 1 is running.

[0099] The other end of the third groove 20111 away from the hollow shaft 10 (i.e. Figure 4a and Figure 6a The end indicated by direction b) is connected to the intersection of the first groove 20121 and the second groove 20122.

[0100] The first liquid outlet portion 302 in the second end cover 30 will be described in detail below.

[0101] See also Figure 6b Combined with Figure 4b In a possible implementation, the first liquid outlet portion 302 is a V-shaped groove (second groove), and the second liquid inlet portion 301 is a Y-shaped groove. Similarly, the embodiment of the present application does not limit the shapes of the first liquid outlet portion 302 and the second liquid inlet portion 301.

[0102] As long as it can be ensured that the first liquid outlet 302 covers the gap 4000 of the silicon steel sheet 40, so that the cooling medium flowing into the gap 4000 from the first liquid inlet of the first end cover can flow into the first liquid outlet 302 and flow out of the second end cover 30 from the first liquid outlet 302, it falls within the protection scope of the embodiments of the present application.

[0103] It should be noted that, according to the foregoing description, in the cooling scheme of the embodiment of the present application, the structure of the second liquid inlet portion 301 of the second end cover 30 is the same as the first liquid inlet portion of the first end cover. The second liquid inlet portion 301 can refer to the foregoing description of the first liquid inlet portion of the first end cover, and the second liquid inlet portion 301 will not be described in detail in this article.

[0104] See also Figure 6b Combined with Figure 6a , the first liquid outlet 302 (eg Figure 6b The V-shaped groove in the first end cap 20 is connected to the first liquid inlet portion 201 (for example Figure 6a The second liquid inlet portion 301 (eg Figure 6b The Y-shaped slot in the first end cap 20 is connected to the second liquid outlet portion 202 (eg Figure 6a The V-shaped groove in the figure corresponds to the V-shaped groove in the figure.

[0105] Continue reading Figure 6b Combined with Figure 4b , along the circumference of the second end cover 30 (such as Figure 6b In the W2 direction shown in FIG, the second liquid inlet portion 301 and the first liquid outlet portion 302 are spaced and staggered.

[0106] See also Figure 6b Combined with Figure 1 and Figure 4b In a possible implementation, the second slot of the first liquid outlet portion 302 is disposed on a side of the second end cover 30 facing the first end cover 20 (i.e. Figure 1 and Figure 4b The side end face indicated by the Z2 direction).

[0107] In a possible implementation manner, the second slot includes a fourth slot 3021 and a fifth slot 3022, the fourth slot 3021 and the fifth slot 3022 are connected at an angle, and the fourth slot 3021 and the fifth slot 3022 are along a second straight line (such as Figure 6a The second straight line N) shown in FIG. 1 is arranged symmetrically.

[0108] For example, Figure 6b As shown, the fourth groove 3021 is along the fifth straight line (as shown Figure 6b The fifth groove 3022 extends along the sixth straight line (shown by the dashed line H). Figure 6a The fifth straight line H and the sixth straight line K are perpendicular to each other. However, this is only one possible implementation. The embodiment of the present application does not limit the angle between the fourth slot 3021 and the fifth slot 3022, and can be selected according to the actual application of the motor (such as the electromagnetic solution).

[0109] For example, Figure 6b As shown, the symmetry lines (i.e., the second straight line N) of the fourth slot 3021 and the fifth slot 3022 intersect at the center P of the second end cover 30. Exemplarily, there is an angle φ2 between the symmetry lines between the adjacent fourth slots 3021 and the fifth slots 3022, and the angle φ2=90°. Accordingly, the embodiment of the present application does not limit this angle, and it can be selected according to the actual application of the motor (e.g., electromagnetic scheme).

[0110] Exemplarily, the angle δ between the second straight line N and the extension line of the fourth slot 3021 (i.e., the fifth straight line H) is 45°. Exemplarily, the angle θ between the second straight line N and the extension line of the fifth slot 3022 (i.e., the sixth straight line K) is 45°. Accordingly, the embodiment of the present application does not limit this angle, and it can be selected according to the actual application of the motor (e.g., electromagnetic scheme).

[0111] See also Figure 6b Combined with Figure 1 and Figure 4b , one end of the first liquid outlet 302 (the second slot) (i.e., the end of the second slot as a whole away from the hollow shaft 10, such as Figure 6b (indicated by direction b) includes a first liquid outlet 3023. Figure 1 and Figure 4b It can be shown more clearly that the first liquid outlet 3023 is opened at the edge of the second end cover 30 .

[0112] Continue reading Figure 6b Combined with Figure 1 and Figure 4bIn a possible implementation, the fourth groove 3021 and the fifth groove 3022 each include a first liquid outlet 3023. That is, one end of the fourth groove 3021 directly penetrates the edge of the second end cover 30, and one end of the fifth groove 3022 also directly penetrates the edge of the second end cover 30. This allows the cooling medium that flows from the first liquid inlet (first slot) into the cooling channel and then into the first liquid outlet 302 (second slot) to flow out of the second end cover 30 through the first liquid outlet 3023 of the fourth groove 3021 and the first liquid outlet 3023 of the fifth groove 3022, respectively.

[0113] The cooling scheme of the motor 1 in the embodiment of the present application is to design a special cooling path between the two end covers (the first end cover 20 and the second end cover 30) and the rotor (six groups of silicon steel sheets). After the cooling medium flows through the cooling path, it can perform heat exchange on the rotor, take away the heat generated inside the rotor, and thus reduce the internal temperature of the rotor; at the same time, after the cooling medium flows out of the end cover from the cooling path, it continues to be thrown to the end of the stator (not shown in the figure, such as the stator winding) under the action of centrifugal force, and continues to cool the stator winding.

[0114] The embodiment of the present application includes two cooling paths, and the first cooling path is described first.

[0115] See also Figure 5 , Figure 6a , Figure 6b and Figure 7 Combined with Figure 1 In a possible implementation manner, when the motor 1 rotates forward (ie, the rotor rotates clockwise), the hollow shaft 10 (eg, Figure 1 The cooling medium in the Z2 direction can flow into the third groove 20111 (the first end cover 20) through the first liquid inlet 2013.

[0116] The cooling medium first flows along Figure 6a The arrow direction of the path L1 shown in FIG. 2 flows toward the intersection of the first groove 20121 and the second groove 20122; at this time, the cooling medium will flow into the first gap 4001 (such as Figure 6a As shown), the first gap 4001 corresponds to the first cooling channel 501 (as shown Figure 7 As shown), the cooling medium in the first cooling channel 501 is along Figure 5 The path L1′ shown in FIG. 1 flows into the fourth groove 3021 (the second end cover 30), and flows along the fourth groove 3021. Figure 5 Path L4 is shown.

[0117] At the same time, under the action of centrifugal force, the cooling medium will Figure 6aThe cooling medium flows toward the first groove 20121 in the direction of the arrow shown in the path L2, and then flows into the second gap 4002 (as shown in FIG. Figure 6a As shown), the second gap 4002 corresponds to the second cooling channel 502 (as shown Figure 7 As shown), the cooling medium in the second cooling channel 502 is along Figure 5 The path L2′ shown in FIG. 1 flows into the fourth groove 3021 (the second end cover 30), and also flows along the fourth groove 3021. Figure 5 Path L4 is shown.

[0118] Finally, the cooling medium flowing into the fourth groove 3021 flows out of the second end cover 30 (such as Figure 5 As shown by the three arrows extending out of the motor 1). Exemplarily, the cooling medium flowing out of the first liquid outlet 3023 of the fourth slot 3021 will flow to the stator winding under the action of centrifugal force to further cool the stator winding.

[0119] The second cooling path is described below.

[0120] See also Figure 5 , Figure 6a , Figure 6b and Figure 7 Combined with Figure 1 In another possible implementation, when the motor 1 is reversed (ie, the rotor rotates counterclockwise), the hollow shaft 10 (eg, Figure 1 The cooling medium in the Z2 direction can flow into the third groove 20111 (the first end cover 20) through the first liquid inlet 2013.

[0121] The cooling medium first flows along Figure 6a The arrow direction of the path L1 shown in FIG. 2 flows toward the intersection of the first groove 20121 and the second groove 20122; at this time, the cooling medium will flow into the third gap 4003 (such as Figure 6a As shown), the third gap 4003 corresponds to the third cooling channel 503 (as shown Figure 7 As shown), the cooling medium in the third cooling channel 503 is along Figure 5 The path L1" shown in FIG. 1 flows into the fifth groove 3022 (the second end cover 30) and flows along the path L2 in the fifth groove 3022. Figure 5 Path L5 is shown.

[0122] At the same time, under the action of centrifugal force, the cooling medium will Figure 6a The cooling medium flows toward the second groove 20122 in the direction of the arrow shown in the path L3, and then flows into the fourth gap 4004 (as shown in FIG. Figure 6a As shown), the fourth gap 4004 corresponds to the fourth cooling channel 504 (as shown Figure 7 As shown), the cooling medium in the fourth cooling channel 504 is along Figure 5 The path L3' shown flows into the fourth groove 3021 (the second end cover 30) and also flows along the fifth groove 3022. Figure 5 Path L5 is shown.

[0123] Finally, the cooling medium flowing into the fifth groove 3022 flows out of the second end cover 30 (such as Figure 5 As shown by the three arrows extending out of the motor 1). Exemplarily, the cooling medium flowing out of the first liquid outlet 3023 of the fifth slot 3022 will also flow to the stator winding under the action of centrifugal force to further cool the stator winding.

[0124] Based on this, the motor 1 of the embodiment of the present application includes a corresponding cooling path regardless of whether it rotates counterclockwise or clockwise, and the fluidity of the cooling medium in the cooling path will not be affected by the rotation direction of the motor 1. The motor of the embodiment of the present application achieves effective cooling of the six groups of silicon steel sheets 40, reduces the heat loss of the motor 1, and effectively improves the working efficiency of the motor 1.

[0125] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A motor, characterized in that: include: Hollow shaft, the interior of which is used for circulating cooling medium; A plurality of groups of silicon steel sheets are arranged around the hollow shaft, each group of the silicon steel sheets is provided with a plurality of magnetic steel grooves, magnetic steel is arranged in the magnetic steel grooves, a gap is formed between the inner wall of the magnetic steel groove and the magnetic steel, and along the axial direction, the corresponding gaps of the plurality of groups of silicon steel sheets correspond to each other and are connected to form a plurality of cooling channels extending along the axial direction; A first end cover, provided with a plurality of first liquid inlet portions, wherein the plurality of first liquid inlet portions are in communication with the hollow shaft; A second end cover, wherein the second end cover and the first end cover are located on both sides of the plurality of groups of silicon steel sheets in the axial direction, and the second end cover is provided with a plurality of first liquid outlets, and along the axial direction, the plurality of first liquid outlets are in communication with the cooling channel; The cooling medium can flow through the first liquid inlet, the cooling channel, and the first liquid outlet in sequence, and flow out of the second end cover from the first liquid outlet.

2. The motor according to claim 1, characterized in that The first end cover is further provided with a plurality of second liquid outlets, and along the axial direction, the plurality of second liquid outlets are communicated with the cooling channel; the second end cover is further provided with a plurality of second liquid inlets, and the plurality of second liquid inlets are communicated with the hollow shaft; The cooling medium can flow through the second liquid inlet, the cooling channel, and the second liquid outlet in sequence, and flow out of the first end cover from the second liquid outlet.

3. The motor according to claim 2, characterized in that Along the circumference of the first end cover, the first liquid inlet portion and the second liquid outlet portion are spaced apart and staggered; along the circumference of the second end cover, the second liquid inlet portion and the first liquid outlet portion are spaced apart and staggered.

4. The motor according to any one of claims 1 to 3, characterized in that: The first liquid inlet portion is disposed on a side of the first end cover facing the silicon steel sheet, and the first liquid inlet portion includes a first slot, wherein: The first slot includes a first slot, a second slot and a third slot that are connected; The third groove extends along the extension direction of the first straight line, the first groove and the second groove are connected at an angle, one end of the third groove is connected to the hollow shaft, and the other end of the third groove is connected to the intersection of the first groove and the second groove, and along the axial direction, at least a portion of the first groove and the second groove are connected to the corresponding cooling channel.

5. The motor according to claim 4, characterized in that The first straight line of each of the third grooves intersects at the center of the first end cover, and the first straight lines of adjacent third grooves are perpendicular to each other.

6. The motor according to claim 4, characterized in that The first slot is Y-shaped.

7. The motor according to claim 4, characterized in that The first liquid outlet is disposed on a side of the second end cover facing the first end cover, and the first liquid outlet includes a second slot, wherein: The second slot includes a fourth slot and a fifth slot that are connected to each other. A first liquid outlet is provided at one end of each of the fourth slot and the fifth slot. The first liquid outlet is provided at the edge of the second end cover so that the cooling medium can flow into the second slot through the first slot and the cooling channel in sequence and then flow out of the second end cover through the first liquid outlet.

8. The motor according to claim 7, characterized in that The width of any one or more of the first slot, the second slot, the fourth slot, and the fifth slot matches the width of the corresponding magnetic steel slot to cover the gap.

9. The motor according to claim 7, characterized in that A width-narrowing portion is provided at a position corresponding to the corresponding magnetic steel in any one or more of the first slot, the second slot, the fourth slot, and the fifth slot to abut against the magnetic steel.

10. The motor according to claim 7, characterized in that The second groove is V-shaped.

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