Driving motor and vehicle
By setting at least three arc segments on the inner wall of the magnetic isolation hole of the drive motor, the problem of the rotor punching magnetic isolation bridge being easily broken during high-speed operation is solved, and the service life of the motor and the reduction of production costs are improved.
Patent Information
- Application Number
- CN202421234586.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In existing drive motors, the magnetic isolation bridge of the rotor punching plate is prone to break during the high-speed operation of the motor, resulting in a decrease in the service life of the motor.
By setting at least three arc segments on the inner wall of the magnetic isolation hole, the inner wall is smoother and the stress concentration is reduced, so that the stress on the rotor is more uniform and the maximum stress is reduced.
Effectively reduce or avoid breakage of rotor punch, improve the service life of the motor, and reduce production costs.
Smart Images
Figure CN222531394U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drive motors, in particular to a drive motor and a vehicle. Background Art
[0002] With the continuous development of social economy, cars, as the most commonly used means of transportation for people, are becoming more and more common in people's lives. Among them, new energy vehicles use motors as their power source, have the lowest cost, no exhaust emissions, and are environmentally friendly. As people's environmental awareness continues to increase, new energy vehicles are becoming more and more popular.
[0003] New energy vehicles usually include a drive motor, which is connected to the axle. The drive motor can drive the axle to rotate so that the vehicle can move. The drive motor includes a stator and a rotor, and the rotor includes a rotor core and a permanent magnet. For example, a mounting hole is opened on the rotor core, and the permanent magnet is located in the mounting hole, wherein a magnetic isolation bridge can be formed between two adjacent mounting holes. The rotor core is formed by a plurality of rotor punchings stacked together. During the high-speed operation of the motor, the rotor punchings are easily broken at the position of the magnetic isolation bridge, which reduces the service life of the motor. Utility Model Content
[0004] In view of this, the utility model provides a drive motor and a vehicle to solve the problem that in the existing drive motor, the magnetic isolation bridge of the rotor punching is easily broken during the high-speed operation of the motor, thereby reducing the service life of the motor.
[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:
[0006] In a first aspect, the present application provides a driving motor, including a rotor core, wherein the rotor core is provided with a plurality of centrally symmetrical mounting hole groups, wherein permanent magnets are arranged in the mounting hole groups;
[0007] Each of the mounting hole groups comprises a first mounting hole and a second mounting hole, and a magnetic isolation bridge is formed between the first mounting hole and the second mounting hole;
[0008] The first mounting hole has a first magnetic isolation hole at one end close to the magnetic isolation bridge, and the second mounting hole has a second magnetic isolation hole at one end close to the magnetic isolation bridge;
[0009] The inner walls of the first magnetic isolation hole and the second magnetic isolation hole each include at least three arc segments, and two adjacent arc segments are tangentially connected.
[0010] In the embodiment of the present application, by making the inner wall of the magnetic isolation hole include at least three arc segments, the stress concentration on the magnetic isolation bridge can be effectively reduced or avoided, so that the force on the rotor is more uniform and the maximum stress can be effectively reduced. In this way, the rotor punching in the rotor can be effectively reduced or avoided from breaking, and the service life of the motor can be effectively improved.
[0011] In a possible implementation, the number of the arc segments is seven, and the seven arc segments are a first arc segment, a second arc segment, a third arc segment, a fourth arc segment, a fifth arc segment, a sixth arc segment and a seventh arc segment that are connected in sequence.
[0012] In a possible implementation, the radii of the first arc segment and the seventh arc segment are 0.5 mm to 5 mm.
[0013] In a possible implementation manner, the radii of the second arc segment, the third arc segment, and the sixth arc segment are 1 mm to 8 mm.
[0014] In a possible implementation, the radii of the fourth arc segment and the fifth arc segment are 5 mm to 20 mm.
[0015] In a possible implementation, the mounting hole group further includes a third mounting hole and a fourth mounting hole;
[0016] The first mounting hole and the second mounting hole are arranged in a V shape, and the third mounting hole and the fourth mounting hole are arranged in a V shape.
[0017] In a possible implementation, a first limiting portion is provided in the first mounting hole, and a second limiting portion is provided in the second mounting hole;
[0018] The first limiting portion and the second limiting portion are used to limit the permanent magnets in the first mounting hole and the second mounting hole, respectively.
[0019] In a possible implementation, the rotor core includes a plurality of rotor punchings that are stacked, and the plurality of rotor punchings are insulated from each other.
[0020] In a possible implementation, an insulating rubber layer is further included, and the rotor punching sheets are insulated and connected through the insulating rubber layer.
[0021] A second aspect of the present application provides a vehicle, comprising any of the drive motors described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 A schematic diagram of the structure of a rotor core provided in an embodiment of the present application;
[0024] Figure 2 A front view of a rotor core provided in an embodiment of the present application;
[0025] Figure 3 for Figure 2 Enlarged view of area A;
[0026] Figure 4 It is a schematic diagram of the structure in which the permanent magnet is arranged in the mounting hole;
[0027] Figure 5 This is an enlarged view of a magnetic isolation bridge provided in an embodiment of the present application.
[0028] Description of reference numerals:
[0029] 100-rotor;
[0030] 110- rotor core; 111- mounting hole group; 1111- first mounting hole;
[0031] 11111-first magnetic isolation hole; 11112-arc segment; 11113-first limiting portion;
[0032] 1112-second mounting hole; 11121-second magnetic isolation hole; 11122-second limiting portion;
[0033] 1113-third mounting hole; 1114-fourth mounting hole;
[0034] 112-magnetic isolation bridge;
[0035] 120-Permanent magnet. DETAILED DESCRIPTION
[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.
[0037] The embodiment of the present application provides a drive motor and a vehicle including the drive motor, wherein the vehicle may be a car, a bus, or a truck. For example, the vehicle may be any one of an electric vehicle / electric vehicle (EV), a pure electric vehicle / battery electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), and a new energy vehicle (NEV).
[0038] As described in the above background technology, the drive motor includes a stator and a rotor, and the rotor includes a rotor core and a permanent magnet. For example, a mounting hole is provided on the rotor core, and the permanent magnet is located in the mounting hole, wherein a magnetic isolation bridge can be formed between two adjacent mounting holes. The rotor core is formed by laminating a plurality of rotor punchings. During high-speed operation of the motor, the rotor punchings are easily broken at the magnetic isolation bridge, which reduces the service life of the motor.
[0039] In the related art, in order to solve the problem of rotor punching fracture, materials with higher yield strength are usually selected to make rotor punchings, which will increase the material cost of the rotor and further increase the overall production cost of the motor.
[0040] In order to solve the above problems, an embodiment of the present application provides a driving motor. By making the inner wall of the magnetic isolation hole include at least three arc segments, the stress concentration in the magnetic isolation bridge can be effectively reduced or avoided, the force on the rotor can be more uniform, and the maximum stress can be effectively reduced. In this way, the breakage of the rotor punching sheets in the rotor can be effectively reduced or avoided, and the service life of the motor can be effectively improved.
[0041] The drive motor provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings.
[0042] Figure 1 A schematic diagram of the structure of a rotor core provided in an embodiment of the present application is shown in FIG. Figure 2 This is a front view of a rotor core provided in an embodiment of the present application. Figure 3 for Figure 2 A magnified view of area A. Figure 4 It is a schematic diagram of the structure of the permanent magnet arranged in the mounting hole.
[0043] The embodiment of the present application provides a driving motor, which may include a stator and a rotor 100, wherein the rotor 100 may include a rotor core 110 and a permanent magnet 120. For example, see Figure 1 and Figure 2 As shown, the rotor core 110 may be provided with a plurality of centrally symmetrical mounting hole groups 111, Figure 3 and Figure 4 As shown, each mounting hole group 111 may include a first mounting hole 1111 and a second mounting hole 1112, and the permanent magnet 120 may be respectively disposed in the first mounting hole 1111 and the second mounting hole 1112. For example, the permanent magnet 120 located in the first mounting hole 1111 may be the first permanent magnet 120, and the permanent magnet 120 located in the second mounting hole 1112 may be the second permanent magnet 120.
[0044] The rotor core 110 may include a plurality of rotor 100 punchings arranged in layers, and the plurality of rotor 100 punchings may be arranged in an insulated manner. For example, the rotor core 110 may further include an insulating rubber layer, and the rotor 100 punchings may be insulated and connected via the insulating rubber layer.
[0045] A magnetic isolation bridge 112 may be formed between the first mounting hole 1111 and the second mounting hole 1112, wherein the first mounting hole 1111 may have a first magnetic isolation hole 11111 at one end close to the magnetic isolation bridge 112, and the second mounting hole 1112 may have a second magnetic isolation hole 11121 at one end close to the magnetic isolation bridge 112. The magnetic isolation holes do not have magnetic conductive materials, which can play a role in magnetic isolation, so as to reduce magnetic leakage between the first permanent magnet 120 and the second permanent magnet 120.
[0046] The inner walls of the first magnetic isolation hole 11111 and the second magnetic isolation hole 11121 may each include at least three arc segments 11112 (for example, Figure 5 the first arc segment 11112a, the second arc segment 11112b, the third arc segment 11112c, the fourth arc segment 11112d, the fifth arc segment 11112e, the sixth arc segment 11112f and the seventh arc segment 11112g), Figure 4 The first magnetic isolation hole is taken as an example for explanation, and two adjacent arc segments 11112 are tangentially connected. That is, the line between the centers of the two tangential arcs passes through the intersection of the two arc segments 11112. In this way, the smoothness of the inner walls of the first magnetic isolation hole 11111 and the second magnetic isolation hole 11121 can be improved, and the sharp corners on the inner walls of the first magnetic isolation hole 11111 and the second magnetic isolation hole 11121 can be reduced or avoided. It can prevent stress concentration on the inner wall of the magnetic isolation hole, help to improve the structural strength of the magnetic isolation bridge 112, make the stress on the rotor 100 when rotating more uniform, reduce the maximum stress, and effectively reduce or avoid the breakage of the magnetic isolation bridge 112.
[0047] The embodiment of the present application makes the inner wall of the magnetic isolation hole include at least three arc segments 11112, which can effectively reduce or avoid stress concentration in the magnetic isolation bridge 112, make the force on the rotor 100 more uniform, and effectively reduce the maximum stress. This can effectively reduce or avoid the breakage of the rotor punchings in the rotor and effectively increase the service life of the motor.
[0048] Moreover, compared with the rotor solution using high yield strength materials in the related art, the rotor structure in the embodiment of the present application can effectively improve the structural strength of the rotor 100 under the same material, and can effectively reduce the breakage of the rotor 100 at high speeds, so that the rotor core 110 can be made of ordinary materials. Under the premise of meeting the high-speed operation conditions of the rotor core 110, the production cost of the drive motor is effectively reduced.
[0049] Figure 5 This is an enlarged view of a magnetic isolation bridge provided in an embodiment of the present application.
[0050] For example, see Figure 5 As shown, in the embodiment of the present application, the number of arc segments 11112 in the inner wall of each magnetic isolation hole can be seven, and the seven arc segments 11112 can be respectively the first arc segment 11112a, the second arc segment 11112b, the third arc segment 11112c, the fourth arc segment 11112d, the fifth arc segment 11112e, the sixth arc segment 11112f and the seventh arc segment 11112g which are connected in sequence. A large number of arc segments 11112 can improve the smoothness of the inner wall of the magnetic isolation hole, reduce the sharp corner structure of the inner wall of the magnetic isolation hole, and effectively reduce the stress concentration on the magnetic isolation bridge 112, thereby effectively improving the structural strength of the magnetic isolation bridge 112.
[0051] Among them, continue to see Figure 5 As shown, the radius of the first arc segment 11112a can be R1, the radius of the seventh arc segment 11112g can be R7, the values of R1 and R7 can be 0.5mm to 5mm, the first arc segment 11112a and the seventh arc segment 11112g are located at the inner wall of the magnetic isolation hole close to the two ends, and the bending radius of this part is relatively small, so that the curves at the two ends of the magnetic isolation hole are close to the middle part. Moreover, under the premise of meeting the bending requirements, the bending radius can also improve the smoothness of the inner wall of the magnetic isolation hole, thereby effectively improving the structural strength of the magnetic isolation bridge 112.
[0052] Continue to see Figure 5As shown, the radius of the second arc segment 11112b may be R2, the radius of the third arc segment 11112c may be R3, and the radius of the sixth arc segment 11112f may be R6, and the values of R2, R3, and R6 may be 1 mm to 8 mm. The second arc segment 11112b may be located between the first arc segment 11112a and the third arc segment 11112c, and the sixth arc segment 11112f may be tangently connected to the seventh arc segment 11112g.
[0053] The second arc segment 11112b, the third arc segment 11112c and the sixth arc segment 11112f gradually approach the middle curve segment of the magnetic isolation hole, and their curve radii can be relatively larger than the curve radii of the first arc segment 11112a and the seventh arc segment 11112g. By making the arc radii of the second arc segment 11112b, the third arc segment 11112c and the sixth arc segment 11112f meet the above values, the smoothness of the inner wall of the magnetic isolation hole can be effectively improved, the sharp corners of the inner wall of the magnetic isolation hole can be reduced, and the structural strength of the magnetic isolation bridge 112 can be effectively improved.
[0054] Continue to see Figure 5 As shown, the radius of the fourth arc segment 11112d may be R4, the radius of the fifth arc segment 11112e may be R5, and the values of R4 and R5 may be 5 mm to 20 mm. The fourth arc segment 11112d may be tangentially connected to the third arc segment 11112c, and the fifth arc segment 11112e may be tangentially connected to the sixth arc segment 11112f.
[0055] The fourth arc segment 11112d and the fifth arc segment 11112e are located in the middle of the magnetic isolation hole curve, and their curve radius is relatively large and gentle. By setting the radius of the fourth arc segment 11112d and the fifth arc segment 11112e to the above values, the smoothness of the middle curve of the magnetic isolation hole can be effectively improved, and the overall structural strength of the magnetic isolation bridge 112 can be effectively improved.
[0056] Continue to see Figure 5 As shown, a first limiting portion 11113 may be provided in the first mounting hole 1111, and a second limiting portion 11122 may be provided in the second mounting hole 1112. The first limiting portion 11113 and the second limiting portion 11122 may be used to limit the permanent magnet 120 in the first mounting hole 1111 and the second mounting hole 1112, respectively.
[0057] For example, the first limiting portion 11113 can limit the first permanent magnet 120 in the first mounting hole 1111, and the second limiting portion 11122 can limit the second permanent magnet 120 in the second mounting hole 1112. This can effectively prevent the permanent magnet 120 from moving or deviating in the mounting hole, help improve the reliability and firmness of the permanent magnet 120 in the mounting hole, and enhance the overall structural stability of the rotor core 110.
[0058] See also Figure 4 As shown, in the embodiment of the present application, the mounting hole group 111 on the rotor core 110 may further include a third mounting hole 1113 and a fourth mounting hole 1114, and permanent magnets 120 may also be disposed in the third mounting hole 1113 and the fourth mounting hole 1114. The first mounting hole 1111 and the second mounting hole 1112 may be disposed in a V-shape, the third mounting hole 1113 and the fourth mounting hole 1114 may be disposed in a V-shape, and the third mounting hole 1113 and the fourth mounting hole 1114 may be located in the V-shaped opening formed by the first mounting hole 1111 and the second mounting hole 1112.
[0059] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more groups.
[0060] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.
[0061] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.
[0062] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0063] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.
[0064] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A driving motor, characterized in that: It comprises a rotor core, wherein the rotor core is provided with a plurality of centrally symmetrical mounting hole groups, and permanent magnets are arranged in the mounting hole groups; Each of the mounting hole groups comprises a first mounting hole and a second mounting hole, and a magnetic isolation bridge is formed between the first mounting hole and the second mounting hole; The first mounting hole has a first magnetic isolation hole at one end close to the magnetic isolation bridge, and the second mounting hole has a second magnetic isolation hole at one end close to the magnetic isolation bridge; The inner walls of the first magnetic isolation hole and the second magnetic isolation hole each include at least three arc segments, and two adjacent arc segments are tangentially connected.
2. The drive motor according to claim 1, characterized in that: The number of the circular arc segments is seven, and the seven circular arc segments are respectively a first circular arc segment, a second circular arc segment, a third circular arc segment, a fourth circular arc segment, a fifth circular arc segment, a sixth circular arc segment and a seventh circular arc segment which are connected in sequence.
3. The drive motor according to claim 2, characterized in that: The radii of the first arc segment and the seventh arc segment are 0.5 mm to 5 mm.
4. The drive motor according to claim 2 or 3, characterized in that: The radii of the second arc segment, the third arc segment and the sixth arc segment are 1 mm to 8 mm.
5. The drive motor according to claim 2 or 3, characterized in that: The radii of the fourth arc segment and the fifth arc segment are 5 mm to 20 mm.
6. The drive motor according to any one of claims 1 to 3, characterized in that: The mounting hole group further includes a third mounting hole and a fourth mounting hole; The first mounting hole and the second mounting hole are arranged in a V shape, and the third mounting hole and the fourth mounting hole are arranged in a V shape.
7. The drive motor according to any one of claims 1 to 3, characterized in that: The first mounting hole has a first limiting portion therein, and the second mounting hole has a second limiting portion therein; The first limiting portion and the second limiting portion are used to limit the permanent magnets in the first mounting hole and the second mounting hole, respectively.
8. The drive motor according to any one of claims 1 to 3, characterized in that: The rotor core comprises a plurality of rotor punchings arranged in layers, and the plurality of rotor punchings are insulated from each other.
9. The driving motor according to claim 8, characterized in that: It also includes an insulating rubber layer, and the rotor punching sheets are insulated and connected through the insulating rubber layer.
10. A vehicle, characterized in that: It comprises the drive motor described in any one of claims 1 to 9.