Motor rotor, motor and vehicle
By designing the arc-shaped transition structure of the guide groove, the stress concentration problem of the motor rotor is solved, fatigue failure is avoided, and the motor performance is improved.
Patent Information
- Application Number
- CN202422610648.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-28
AI Technical Summary
The motor rotor has structural defects that lead to stress concentration, causing fatigue failure of the rotor at both ends of the guide bar slots, affecting the motor performance.
The depth of the guide groove is designed to be consistent with the length direction of the rotor body. The width of the first end and the second end gradually increases, and the end angle transition is arc-shaped. The guide grooves are evenly spaced along the circumference of the rotor body to avoid stress concentration.
The arc-shaped transition design reduces the stress of the rotor body at both ends of the guide bar slot, avoids fatigue failure, and improves the performance of the motor.
Smart Images
Figure CN223334480U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of vehicle components, and in particular to a motor rotor, a motor, and a vehicle. Background Art
[0002] Electric vehicles are vehicles that use an onboard power source, an electric motor to drive the wheels, and comply with all road traffic and safety regulations. Their prospects are widely optimistic due to their lower environmental impact compared to traditional vehicles.
[0003] The electric drive system is the core of electric vehicles. It includes a motor, a controller, a reducer and a transmission mechanism. The electric drive system converts electrical energy into mechanical energy to drive the vehicle forward.
[0004] However, there are certain defects in the structure of the rotor in the motor, which affects the performance of the motor and thus affects the performance of the electric drive system. Utility Model Content
[0005] The present application provides a motor rotor, a motor, and a vehicle to solve the problem that the rotor structure in the motor has certain defects, which affects the performance of the motor and thus affects the performance of the electric drive system.
[0006] The present application provides a motor rotor, comprising a rotor body and rotating shafts arranged at both ends of the rotor body;
[0007] The rotor body has a plurality of guide bar grooves in the circumferential direction, and the groove depth direction of the guide bar grooves is consistent with the length direction of the rotor body;
[0008] The guide bar groove has a first end close to the center of the rotor body and a second end away from the center of the rotor body. The width of the guide bar groove gradually increases from the first end to the second end, and the end angles of the first end and the second end are both arc-shaped transitions.
[0009] The guide bar grooves are evenly spaced along the circumference of the rotor body.
[0010] In a possible implementation, in the motor rotor provided in the present application, the interval between two adjacent guide bar slots is L1, and L1 is between 2.5 mm and 2.6 mm.
[0011] In a possible implementation, the motor rotor provided in the present application has a length from the first end to the second end of L2, and L2 is between 14.9 mm and 15.1 mm.
[0012] In a possible implementation, the motor rotor provided in the present application has a distance L3 between the second end and the peripheral wall of the rotor body, and L3 is between 0.4 mm and 0.5 mm.
[0013] In a possible implementation, the motor rotor provided in the present application has a first end at a distance from the center of the rotor body of L4, and L4 is between 43 mm and 43.5 mm.
[0014] In a possible implementation, the motor rotor provided in the present application has a width at the first end of 1.6 mm to 1.65 mm, and a width at the second end of 3 mm to 3.1 mm.
[0015] In a possible implementation, in the motor rotor provided in the present application, the angle between the extended lines of two sides of the guide bar slot along the length direction is angle a, and angle a is 5.5°.
[0016] In a possible implementation, in the motor rotor provided by the present application, the angle between the center lines of two adjacent guide bar slots along their length direction is angle b, and angle b is between (360 / 65)° and (360 / 54)°.
[0017] The present application also provides a motor, comprising a motor housing, a stator disposed in the motor housing, and a motor rotor according to any one of the above technical solutions disposed in the stator.
[0018] The present application also provides a vehicle, comprising a vehicle body and the motor according to the above technical solution installed on the vehicle body.
[0019] The present application provides a motor rotor, a motor, and a vehicle, wherein the motor rotor includes a rotor body and a rotating shaft. The rotor body has a plurality of guide bar grooves circumferentially, wherein the depth of the guide bar grooves is consistent with the length of the rotor body. The guide bar grooves have a first end proximal to the center of the rotor body and a second end distal to the center of the rotor body. The width of the guide bar grooves gradually increases from the first end to the second end, and the first and second ends have arc-shaped transitions at their end corners. The guide bar grooves are evenly spaced along the circumference of the rotor body. By providing arc-shaped transitions at the end corners between the first and second ends, the stress on the rotor body at the first and second ends is reduced, thereby avoiding fatigue failure of the rotor body at both ends of the guide bar grooves and ensuring the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0021] Figure 1 A schematic side view of the motor rotor according to an embodiment of the present application;
[0022] Figure 2 A schematic diagram of the partial structure of a motor rotor provided in an embodiment of the present application;
[0023] Figure 3A schematic diagram of a portion of the structure of the motor provided in an embodiment of the present application.
[0024] Description of reference numerals:
[0025] 100- rotor body;
[0026] 200-guide groove;
[0027] 210-first end;
[0028] 220-Second end.
[0029] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION
[0030] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0031] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the implementation of the application described herein, for example, can be implemented in an order other than those illustrated or described herein. In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being more preferred or 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 concrete way.
[0032] As mentioned in the background article, electric vehicles are vehicles that use an onboard power source to drive their wheels, complying with all road traffic and safety regulations. Their environmental impact is relatively low compared to traditional vehicles, and their prospects are widely optimistic.
[0033] The electric drive system is the core of electric vehicles. It includes a motor, a controller, a reducer and a transmission mechanism. The electric drive system converts electrical energy into mechanical energy to drive the vehicle forward.
[0034] However, there are certain defects in the structure of the rotor in the motor, which affects the performance of the motor and thus affects the performance of the electric drive system.
[0035] The rotor has guide bar grooves, and stress concentration generated at the edges of both ends of the guide bar grooves may cause fatigue failure of the rotor at both ends of the guide bar grooves.
[0036] To address the technical issues raised above, the present application provides a motor rotor, motor, and vehicle, wherein the motor rotor includes a rotor body and a rotating shaft. The rotor body has a plurality of guide bar grooves circumferentially, and the groove depth of the guide bar grooves is consistent with the length direction of the rotor body. The guide bar grooves have a first end near the center of the rotor body and a second end away from the center of the rotor body. The width of the guide bar grooves gradually increases from the first end to the second end, and the first and second ends have arc-shaped transitions at the end angles. The guide bar grooves are evenly spaced along the circumference of the rotor body. By making arc-shaped transitions at the end angles between the first and second ends, the stress of the rotor body at the first and second ends is reduced, thereby avoiding the problem of fatigue failure of the rotor body at both ends of the guide bar grooves and ensuring the performance of the motor.
[0037] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.
[0038] Combine Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present application discloses a motor rotor, including a rotor body 100 and rotating shafts arranged at both ends of the rotor body 100.
[0039] The rotor body 100 has a plurality of guide bar grooves 200 in the circumferential direction. The depth of the guide bar grooves 200 is consistent with the length direction of the rotor body 100 .
[0040] The guide bar groove 200 has a first end 210 close to the center of the rotor body 100 and a second end 220 away from the center of the rotor body 100. The width of the guide bar groove 200 gradually increases from the first end 210 to the second end 220, and the end corners of the first end 210 and the second end 220 are both arc-shaped transitions.
[0041] The guide grooves 200 are evenly spaced around the circumference.
[0042] Exemplarily, the interval between adjacent guide grooves 200 is L1, and L1 is between 2.5 mm and 2.6 mm.
[0043] It should be noted here that in the prior art, if the interval between two adjacent guide bar slots 200 is too large, the area occupied by the guide bar slots 200 will be reduced, the guide bar resistance will increase, and the heating of the motor guide bar will be a serious problem; if the interval between two adjacent guide bar slots 200 is too small, the area occupied by the guide bar slots 200 will be increased, the guide bar resistance will decrease, but the motor teeth will be saturated and the motor torque will decrease.
[0044] In order to solve the above problems, by limiting the intervals between adjacent guide bar slots 200, it is possible to avoid not only the problem that the intervals between two adjacent guide bar slots 200 are too large, resulting in a reduction in the area occupied by the guide bar slots 200, an increase in the guide bar resistance, and serious heating of the motor guide bars, but also the problem that the intervals between two adjacent guide bar slots 200 are too small, resulting in an increase in the area occupied by the guide bar slots 200, a decrease in the guide bar resistance, saturation of the motor teeth, and a decrease in the motor torque, thereby further ensuring the performance of the motor.
[0045] Exemplarily, the motor to which the motor rotor of the present application is applicable is a 6-pole asynchronous motor.
[0046] Exemplarily, the guide groove 200 is arranged in an isosceles trapezoidal shape from the first end 210 to the second end 220 .
[0047] For example, L1 is 2.55 mm, and the machining error is between +0.01 mm and -0.03 mm.
[0048] By adopting the above technical solution, by performing an arc-shaped transition at the end angles of the first end 210 and the second end 220, the stress of the rotor body 100 at the first end 210 and the second end 220 is reduced, thereby avoiding the problem of fatigue failure of the rotor body 100 at both ends of the guide bar slot 200; by limiting the intervals between adjacent guide bar slots 200, not only can the problem of the interval between two adjacent guide bar slots 200 being too large, resulting in a reduction in the area occupied by the guide bar slots 200, an increase in the guide bar resistance, and serious heating of the motor guide bar, but also the problem of the interval between two adjacent guide bar slots 200 being too small, resulting in an increase in the area occupied by the guide bar slots 200, a reduction in the guide bar resistance, saturation of the motor teeth, and a decrease in the motor torque can be avoided, thereby ensuring the performance of the motor.
[0049] In some embodiments, the length from the first end 210 to the second end 220 is L2, and L2 is between 14.9 mm and 15.1 mm.
[0050] For example, L2 is 15 mm, and the machining error is between +0.02 mm and -0.02 mm.
[0051] By adopting the above technical solution, if the length of the guide bar slot 200 from the first end 210 to the second end 220 is too long, the motor magnetic circuit distribution will be lengthened, the motor leakage magnetic flux will increase, and the motor torque will decrease; if the length of the guide bar slot 200 from the first end 210 to the second end 220 is too short, the motor magnetic circuit will be shortened and the leakage magnetic flux will be reduced, but the motor conductive bar area will be reduced, the conductive bar resistance will increase, and the conductive bar heating will be serious; therefore, the length of the guide bar slot 200 from the first end 210 to the second end 220 is limited, while taking into account its magnetic properties and conductive bar resistance.
[0052] In some embodiments, the distance between the second end 220 and the peripheral wall of the rotor body 100 is L3, and L3 is between 0.4 mm and 0.5 mm.
[0053] Exemplarily, L3 is 0.45 mm, and the machining error is between +0.02 mm and -0.02 mm.
[0054] By adopting the above technical solution, by limiting the distance between the second end 220 and the peripheral wall of the rotor body 100, not only the problem of the second end 220 being too far away from the peripheral wall of the rotor body 100, resulting in serious magnetic leakage of the motor and reduced motor torque, but also the problem of the second end 220 being too far away from the peripheral wall of the rotor body 100, affecting the mechanical strength of the rotor body 100, is avoided.
[0055] In some embodiments, the first end 210 is spaced apart from the center of the rotor body 100 by a distance L4, where L4 is between 43 mm and 43.5 mm.
[0056] For example, L4 is 43.25 mm, and the machining error is between +0.03 mm and -0.02 mm.
[0057] By adopting the above technical solution and setting L4, it is possible to ensure that the first end 210 is larger than the minimum processing size, thereby facilitating the processing of the guide groove 200.
[0058] In some embodiments, the width of the first end 210 is between 1.6 mm and 1.65 mm, and the width of the second end 220 is between 3 mm and 3.1 mm.
[0059] Exemplarily, the width of the first end 210 is 1.631 mm, and the width of the second end 220 is 3.802 mm.
[0060] By adopting the above technical solution, the magnetic flux density of the motor rotor can be adjusted so that the magnetic flux density of the motor rotor is close to the saturation state. It can be understood that too high magnetic flux density of the motor rotor will lead to a decrease in magnetic permeability, while magnetic flux density close to the saturation state can improve the performance of the motor.
[0061] In some embodiments, the angle a between the extended lines of the two sides of the guide groove 200 along the length direction is 5.5°.
[0062] By adopting the above technical solution, it is possible to ensure that two adjacent guide bar slots 200 are arranged in parallel, so that the magnetic flux density is uniform and the magnetic field strength is consistent.
[0063] In some embodiments, the angle between the center lines of two adjacent guide grooves 200 along their length directions is angle b, and angle b is between (360 / 65)° and (360 / 54)°.
[0064] Exemplarily, the angle b is 5.54°.
[0065] By adopting the above technical solution, an angle is formed between the center lines of two adjacent guide grooves 200 along their length directions, which can not only reduce torque fluctuations, but also reduce the harmonic content of the motor, helping to improve its noise, vibration and harshness (NVH) performance.
[0066] Combine Figure 3 , an embodiment of the present application further discloses a motor, comprising a motor housing, a stator disposed in the motor housing, and a motor rotor according to any one of the above embodiments disposed in the stator.
[0067] The structure and principle of the motor rotor have been clearly explained in the above embodiments and will not be elaborated here one by one.
[0068] An embodiment of the present application further discloses a vehicle, comprising a vehicle body and the motor according to the above embodiment mounted on the vehicle body.
[0069] The structure and principle of the motor have been clearly explained in the above embodiments and will not be elaborated here. Of course, the vehicle body also includes a controller, a reducer, and a transmission mechanism, etc. These are existing technologies in the relevant field and are not limited by the embodiments of this application.
[0070] The implementation principle of the embodiments of the present application is as follows: The embodiments of the present application provide a motor rotor, a motor, and a vehicle, wherein the motor rotor includes a rotor body 100 and a rotating shaft disposed at both ends of the rotor body 100. The rotor body 100 has multiple guide bar slots 200 circumferentially, with the depth of the guide bar slots 200 aligning with the length of the rotor body 100. The guide bar slots 200 have a first end 210 near the center of the rotor body 100 and a second end 220 facing away from the center of the rotor body 100. The width of the guide bar slots 200 gradually increases from the first end 210 to the second end 220, and the corners between the first end 210 and the second end 220 each have an arc-shaped transition. The guide bar slots 200 are evenly spaced around the circumference. By creating an arc-shaped transition at the corners between the first end 210 and the second end 220, the stress on the rotor body 100 at the first end 210 and the second end 220 is reduced, thereby avoiding fatigue failure of the rotor body 100 at both ends of the guide bar slots 200 and ensuring the performance of the motor.
[0071] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.
[0072] It should be noted that phrases such as "one embodiment," "an embodiment," "exemplary embodiments," and "some embodiments" in this specification may indicate embodiments that may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.
[0073] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.
[0074] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).
[0075] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.
[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A motor rotor, characterized in that: It comprises a rotor body (100) and rotating shafts arranged at both ends of the rotor body (100); The rotor body (100) has a plurality of guide bar grooves (200) in the circumferential direction, and the groove depth direction of the guide bar grooves (200) is consistent with the length direction of the rotor body (100); The guide bar groove (200) has a first end (210) close to the center of the rotor body (100) and a second end (220) away from the center of the rotor body (100); The width of the guide groove (200) gradually increases from the first end (210) to the second end (220), and the end corners of the first end (210) and the second end (220) are both arc-shaped transitions; The guide bar grooves (200) are evenly spaced and distributed along the circumference of the rotor body (100).
2. The motor rotor according to claim 1, characterized in that: The interval between two adjacent guide grooves (200) is L1, and L1 is between 2.5 mm and 2.6 mm.
3. The motor rotor according to claim 1, characterized in that: The length from the first end (210) to the second end (220) is L2, and L2 is between 14.9 mm and 15.1 mm.
4. The motor rotor according to claim 1, characterized in that: The distance between the second end (220) and the peripheral wall of the rotor body (100) is L3, and L3 is between 0.4 mm and 0.5 mm.
5. The motor rotor according to claim 1, characterized in that: The distance between the first end (210) and the center of the rotor body (100) is L4, and L4 is between 43 mm and 43.5 mm.
6. The motor rotor according to claim 1, characterized in that: The width of the first end (210) is between 1.6 mm and 1.65 mm, and the width of the second end (220) is between 3 mm and 3.1 mm.
7. The motor rotor according to any one of claims 1 to 6, characterized in that: The included angle between the extended lines of the two sides of the guide groove (200) along the length direction is angle a, and the included angle a is 5.5°.
8. The motor rotor according to any one of claims 1 to 6, characterized in that: The included angle between the center lines of two adjacent guide grooves (200) along their length directions is an included angle b, and the included angle b is between (360 / 65)° and (360 / 54)°.
9. A motor, characterized in that: The motor comprises a motor housing, a stator arranged in the motor housing, and a motor rotor according to any one of claims 1 to 8 arranged in the stator.
10. A vehicle, characterized in that: The vehicle comprises a vehicle body and the motor according to claim 9 mounted on the vehicle body.