Motor rotor structure and driving motor

Abstract

The utility model relates to a motor rotor structure and a driving motor, and relates to the technical field of driving devices. A motor rotor structure comprises a rotor body and a plurality of first magnets, the rotor body is provided with a plurality of first fixing grooves in the radial direction, the first fixing grooves are evenly arranged at intervals in the circumferential direction of the rotor body, the first magnets are clamped in the fixing grooves in a one-to-one correspondence mode, and a first magnetic isolation bridge is arranged between every two adjacent first fixing grooves. The first magnetic isolation bridge is located at one end of the first fixing groove close to the central axis of the rotor body. According to the motor rotor structure, the first magnets are radially arranged along the rotor body section, the utilization rate of the first magnets is improved, the magnet consumption is reduced, and the cost is reduced. Meanwhile, one end, close to the center of the rotor body, of each first fixing groove is provided with a first magnetic isolation bridge, the space is fully utilized to optimize the structure of the rotor body, the utilization rate of the permanent magnets is ensured, and the performance and efficiency of the motor are further improved.

Description

Technical Field

[0001] The present application relates to the technical field of drive devices, and in particular to a motor rotor structure and a drive motor. Background Art

[0002] Permanent magnet motors use permanent magnets for excitation, simplifying their structure and reducing processing and assembly costs. They are commonly used as drive devices in devices such as three-wheeled electric vehicles and new energy vehicles. Permanent magnet motors primarily consist of a stator, rotor, and end caps. The rotor, which secures the permanent magnets, is a key component of a permanent magnet motor.

[0003] Existing three-wheeled electric vehicle inner rotor motors typically use a V-shaped internal rectangular magnet arrangement. This arrangement results in low reluctance torque and low magnetic flux, resulting in high magnet usage and high costs. Therefore, improvements are needed to the existing rotor structure and magnet arrangement. Utility Model Content

[0004] The purpose of this application is to provide a motor rotor structure and a drive motor to solve the above technical problems.

[0005] An embodiment of the present utility model provides a motor rotor structure, which includes a rotor body and a plurality of first magnets. The rotor body is provided with a plurality of first fixing grooves along the radial direction, and the first fixing grooves are evenly spaced along the circumference of the rotor body. The first magnets are clamped in the fixing grooves one by one, and a first magnetic isolation bridge is provided between two adjacent first fixing grooves. The first magnetic isolation bridge is located at one end of the first fixing groove close to the central axis of the rotor body.

[0006] Furthermore, a spacing groove is provided at one end of the first fixing groove close to the radial inner side of the rotor body, and the first magnetic isolation bridge is located between two adjacent spacing grooves.

[0007] Furthermore, there are two spacing grooves, and the two spacing grooves are symmetrically arranged on both sides of the first fixing groove.

[0008] Furthermore, the extending direction of the spacing groove is inclined relative to the radial direction of the first fixing groove. Assuming that the included angle between the spacing groove and the first fixing groove is α, then 35°<α<45°.

[0009] Furthermore, the first fixed slot includes a plurality of slot bodies arranged in sequence along the radial direction of the rotor body, two adjacent slot bodies are spaced apart from each other, and a first magnet is provided in each slot body.

[0010] Furthermore, a plurality of second fixing grooves are provided on the peripheral wall of the rotor body at intervals. The second fixing grooves are respectively provided between two adjacent first fixing grooves. Second magnets are provided in the second fixing grooves.

[0011] Furthermore, a second magnetic isolation bridge is provided at one end of the first fixing slot close to the second fixing slot.

[0012] Furthermore, the first magnet and the second magnet include one or more of rectangular magnetic steel and arc-shaped magnetic steel.

[0013] Furthermore, a limiting protrusion is provided at one end of the first fixing slot close to the first magnetic isolation bridge, and the limiting protrusion is abutted against the first magnet for limiting position.

[0014] On the other hand, an embodiment of the present invention further provides a drive motor, which includes a housing, a stator and any one of the above-mentioned motor rotor structures, wherein the stator and the motor rotor structure are both arranged inside the housing.

[0015] The motor rotor structure provided by the utility model has first fixed slots evenly spaced radially along the rotor body, and first magnets disposed within the first fixed slots. The radial arrangement of the first magnets along the rotor body improves the utilization of the first magnets, reduces magnet usage, and lowers costs. Furthermore, a first magnetic isolation bridge is provided at one end of the first fixed slot near the center of the rotor body, fully utilizing the space to optimize the rotor body structure, ensure the utilization of the permanent magnets, and further improve the performance and efficiency of the motor.

[0016] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 One of the front views of the rotor body provided in an embodiment of the present application;

[0019] Figure 2 A three-dimensional diagram of a rotor body provided in an embodiment of the present application;

[0020] Figure 3 The second front view of the rotor body provided in the embodiment of the present application;

[0021] Figure 4 The third front view of the rotor body provided in the embodiment of the present application;

[0022] Figure 5 This is a fourth front view of the rotor body provided in an embodiment of the present application;

[0023] Figure 6Provided in the embodiments of this application Figure 5 Magnified view of area A in center.

[0024] Icon: 100 - rotor body; 200 - first magnet; 101 - first fixing slot; 102 - first magnetic isolation bridge; 103 - spacing slot; 104 - second fixing slot; 300 - second magnet; 105 - second magnetic isolation bridge; 106 - limiting protrusion. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0027] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] Please refer to Figure 1 and Figure 2 As shown, this embodiment provides a motor rotor structure, which includes a rotor body 100 and a plurality of first magnets 200. The rotor body 100 is provided with a plurality of first fixed grooves 101 along the radial direction, and the first fixed grooves 101 are evenly spaced along the circumference of the rotor body 100. The first magnets 200 are respectively clamped in the fixed grooves, and a first magnetic isolation bridge 102 is provided between two adjacent first fixed grooves 101. The first magnetic isolation bridge 102 is located at one end of the first fixed groove 101 close to the central axis of the rotor body 100.

[0029] In this embodiment, the rotor body 100 can be manufactured using an integral molding process or by lamination. The rotor body 100 is an overall cylindrical structure and radially defines a plurality of first fixing slots 101. Each first fixing slot 101 is provided with a first magnet 200. Multiple first magnets 200 are evenly spaced circumferentially on the rotor body 100, forming a spoke-like structure. The spoke-like arrangement of the first magnets 200 allows the ends of the first magnets 200 to face the coils on the stator. This increases the magnetic flux at the interface between the first magnets 200 and the stator, boosting the torque of the rotor body 100. Even with a reduced size, the rotor can still function properly. Compared to existing rectangular "V"-shaped magnet arrangements, the spoke-like arrangement employed in this embodiment significantly improves the motor's reluctance torque, thereby reducing magnet usage and improving magnet utilization, thereby reducing motor cost. At the same time, in order to prevent the leakage magnetic coefficient of the permanent magnet from being too large, which would lead to an excessively low utilization rate of the permanent magnet, a first magnetic isolation bridge 102 is provided between two adjacent first fixed slots 101. The first magnetic isolation bridge 102 is located at one end of the first fixed slot 101 close to the central axis of the rotor body 100. It can be understood that the first magnets 200 are distributed in a spoke-like manner, and the closer to the central axis of the rotor body 100, the smaller the distance between the first magnets 200. In order to improve the utilization rate of the permanent magnets, a magnetic isolation bridge is provided between the first magnets 200 to increase the utilization rate of the magnets and ensure the use effect of the first magnets 200.

[0030] In some possible embodiments, a spacing groove 103 is provided at one end of the first fixing groove 101 close to the radial inner side of the rotor body 100 , and the first magnetic isolation bridge 102 is located between two adjacent spacing grooves 103 .

[0031] Please refer to Figure 1 As shown, a spacing slot 103 is provided at one end of the first fixing slot 101 near the center of the rotor body 100. The spacing slots 103 are provided on both sides of the first fixing slot 101. Because the first fixing slots 101 are arranged in a spoke-like pattern, the distance between adjacent first fixing slots 101 decreases as they approach the center of the rotor body 100. In this case, spacing slots 103 are provided on both sides of the first fixing slot 101, forming a narrow magnetic isolation bridge structure between the two first fixing slots 101. This structure saturates the magnetic flux in this area, thereby limiting magnetic leakage. The spacing slots 103 cooperate with the spoke-like arrangement of the first fixing slots 101 to fully optimize space. By utilizing the characteristic that the distance between adjacent first fixing slots 101 decreases as they approach the center of the rotor body 100, the first magnetic isolation bridge 102 is formed. This ensures the utilization rate of the first magnet 200 while not significantly affecting the support strength of the rotor body 100, thereby ensuring the performance and service life of the rotor body 100.

[0032] In some possible implementations, there are two spacing grooves 103 , and the two spacing grooves 103 are symmetrically disposed on both sides of the first fixing groove 101 .

[0033] Please refer to Figure 1 As shown, there are two spacing grooves 103 , and the two spacing grooves 103 are symmetrically distributed on both sides of the first fixing groove 101 , so that a first magnetic isolation bridge 102 structure can be formed between any first fixing groove 101 and the first fixing grooves 101 on both sides.

[0034] In some possible embodiments, the extending direction of the spacing groove 103 is inclined relative to the radial direction of the first fixing groove 101 . Assuming that the included angle between the spacing groove 103 and the first fixing groove 101 is α, then 35°<α<45°.

[0035] Please refer to Figure 1 As shown, inclined spacing slots 103 are provided on either side of the first fixing slot 101, near the center of the rotor body 100. These spacing slots 103 form a dovetail-shaped magnetic isolation bridge structure, ensuring magnetic isolation while preventing the spacing slots 103 from affecting the support strength of the rotor body 100. The spacing slots 103 are interconnected with the first fixing slot 101, forming an angle between them. The angle between the spacing slots 103 and the first fixing slot 101 ranges from 35° to 45°. It is understood that if the angle between the spacing slots 103 and the first fixing slots 101 is too small, a narrow magnetic isolation bridge cannot be formed between the two first fixing slots 101, thereby failing to achieve magnetic isolation and improve magnet utilization. Conversely, if the angle between the spacing slots 103 and the first fixing slots 101 is too large, the connecting material between adjacent first fixing slots 101 is reduced, affecting the support strength and service life of the entire rotor body 100. Therefore, the angle between the spacing slot 103 and the first fixing slot 101 is preferably set to 40°, which can form a magnetic isolation bridge structure to ensure the utilization rate of the magnets while avoiding affecting the supporting strength of the rotor body 100.

[0036] In some possible embodiments, the first fixed slot 101 includes a plurality of slot sections sequentially arranged along the radial direction of the rotor body 100 , two adjacent slot sections are spaced apart from each other, and a first magnet 200 is disposed in each slot section.

[0037] Please refer to Figure 3 As shown, the first fixing slot 101 is formed by multiple slots arranged in sequence, and a first magnet 200 is set in each slot. The first magnet 200 is formed by combining multiple magnets. The multiple first magnets 200 can be produced and installed separately, reducing the difficulty of production and installation. It should be noted that Figure 3 The figure only shows a structure of two sections of the fixing groove. In some possible embodiments, the first fixing groove 101 can also be set to a multi-section structure such as three sections or four sections.

[0038] In some possible embodiments, a plurality of second fixing slots 104 are spaced apart on the peripheral wall of the rotor body 100 . The second fixing slots 104 are respectively opened between two adjacent first fixing slots 101 . The second magnets 300 are disposed in the second fixing slots 104 .

[0039] Please refer to Figure 4 As shown, the rotor body 100 is provided with a second fixing slot 104 on its circumferential wall. The second fixing slot 104 is located between two adjacent first fixing slots 101, thereby increasing the magnetic flux at the point where the rotor body 100 and the stator meet, thereby improving rotor efficiency. It is understood that the first fixing slots 101 and the first magnets 200 are arranged in a spoke-like structure. The further away from the center of the rotor body 100, the greater the distance between the first fixing slots 101. In this case, the distance between two adjacent first magnets 200 may be too large due to the influence of the rotor radius and the width of the first magnets 200, affecting the performance of the rotor. In this case, a second magnet 300 can be added between two adjacent first magnets 200 to increase the magnetic flux at the point where the rotor meets the stator, thereby ensuring rotor efficiency. It should be noted that the second magnet 300 can be secured to the second fixing slot 104 by gluing or snapping, and the specific connection method is not limited.

[0040] Please refer to Figure 5 and Figure 6 As shown, in some possible embodiments, a second magnetic isolation bridge 105 is provided at one end of the first fixed groove 101 close to the second fixed groove 104, and a narrow magnetic isolation bridge structure is formed by reducing the material between the first fixed groove 101 and the second fixed groove 104, thereby further improving the utilization rate of the first magnet 200 and the second magnet 300.

[0041] In some possible embodiments, a limiting protrusion 106 is provided at one end of the first fixing slot 101 close to the first magnetic isolation bridge 102 , and the limiting protrusion 106 abuts against the first magnet 200 for limiting position.

[0042] Please refer to Figure 1 As shown, a limiting protrusion 106 is provided at one end of the first fixing groove 101 near the center of the rotor body 100, and the width of the limiting protrusion 106 is smaller than the width of the first fixing groove 101. The limiting protrusion 106 abuts against one end of the first magnet 200, while the other end of the first magnet 200 abuts against the inner wall of the fixing groove, thereby fixing the first magnet 200. No other device is required to assist in fixing during installation, and assembly and disassembly are convenient. The first magnet 200 is installed in the first fixing groove 101 through the limiting protrusion 106. The limiting protrusion 106 reduces the contact area with the first magnet 200. The limiting protrusion 106 also acts as a magnetic isolation bridge to ensure the utilization rate of the first magnet 200.

[0043] In some possible embodiments, the first magnet 200 and the second magnet 300 include one or more of rectangular magnetic steel and arc-shaped magnetic steel.

[0044] The first and second magnets 200, 300 can be configured in a square or tile-shaped arc shape, depending on actual production needs. To ensure stability during installation, retaining grooves can be provided on the first and second magnets 200, 300, which cooperate with the positioning protrusions on the rotor body 100 to provide position limits, ensuring the stability and performance of the first and second magnets 200, 300. Both the first and second magnets 200, 300 are made of permanent magnet steel, a common type of permanent magnet on the market, offering excellent corrosion resistance and a long service life.

[0045] The utility model also provides a driving motor, which comprises a housing, a stator and any one of the above motor rotor structures, wherein the stator and the motor rotor structure are both arranged inside the housing.

[0046] The drive motor provided in this embodiment adopts the motor rotor structure provided in the above embodiment, which has low cost and high utilization rate of the permanent magnets of the rotor, thereby improving the efficiency and use effect of the drive motor.

[0047] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0048] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A motor rotor structure, characterized in that: The invention comprises a rotor body (100) and a plurality of first magnets (200), wherein the rotor body (100) is provided with a plurality of first fixing grooves (101) in a radial direction, and the first fixing grooves (101) are evenly spaced along the circumference of the rotor body (100), the first magnets (200) are respectively arranged in the fixing grooves, and a first magnetic isolation bridge (102) is provided between two adjacent first fixing grooves (101), and the first magnetic isolation bridge (102) is located at one end of the first fixing groove (101) close to the central axis of the rotor body (100).

2. The motor rotor structure according to claim 1, characterized in that: A spacing groove (103) is provided at one end of the first fixing groove (101) close to the radial inner side of the rotor body (100), and the first magnetic isolation bridge (102) is located between two adjacent spacing grooves (103).

3. The motor rotor structure according to claim 2, characterized in that: The number of the spacing grooves (103) is two, and the two spacing grooves (103) are symmetrically arranged on both sides of the first fixing groove (101).

4. The motor rotor structure according to claim 3, characterized in that: The extending direction of the spacing groove (103) is inclined relative to the radial direction of the first fixing groove (101). Assuming that the included angle between the spacing groove (103) and the first fixing groove (101) is α, then 35°<α<45°.

5. The motor rotor structure according to claim 1, characterized in that: The first fixed slot (101) comprises a plurality of slot bodies sequentially arranged along the radial direction of the rotor body (100), two adjacent slot bodies are spaced apart from each other, and the first magnet (200) is disposed in each slot body.

6. The motor rotor structure according to any one of claims 1 to 5, characterized in that: A plurality of second fixing grooves (104) are provided on the peripheral wall of the rotor body (100) at intervals. The second fixing grooves (104) are respectively provided between two adjacent first fixing grooves (101). Second magnets (300) are provided in the second fixing grooves (104).

7. The motor rotor structure according to claim 6, characterized in that: A second magnetic isolation bridge (105) is provided at one end of the first fixing slot (101) close to the second fixing slot (104).

8. The motor rotor structure according to claim 6, characterized in that: The first magnet (200) and the second magnet (300) include one or more of rectangular magnetic steel and arc-shaped magnetic steel.

9. The motor rotor structure according to claim 1, characterized in that: A limiting protrusion (106) is provided at one end of the first fixing slot (101) close to the first magnetic isolation bridge (102), and the limiting protrusion (106) abuts against the first magnet (200) for limiting position.

10. A driving motor, characterized in that: It comprises a housing, a stator and the motor rotor structure according to any one of claims 1 to 9, wherein the stator and the motor rotor structure are both arranged inside the housing.

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