Rotor structure of high-speed permanent magnet synchronous motor

Abstract

The invention relates to the technical field of high-speed permanent magnet synchronous motors, and discloses a high-speed permanent magnet synchronous motor rotor structure, which comprises a rotor body, a plurality of groups of main mounting grooves are uniformly formed in the rotor body along the circumferential direction, and first permanent magnets are mounted in the plurality of groups of main mounting grooves; the plurality of groups of main mounting grooves comprise first mounting grooves and second mounting grooves, the first mounting grooves and the second mounting grooves are arranged in a central symmetry manner relative to the axis of the rotor body, and the rotor body is provided with first magnetic isolation bridges used for isolating the first mounting grooves from the second mounting grooves; the first magnetic isolation bridge is of a first V-shaped structure, an opening of the first V-shaped structure faces the peripheral side of the rotor body, and the technical problems that an existing magnetic isolation effect is poor, the magnetic leakage rate is high, the high-speed stability is insufficient, and the dynamic performance is limited are solved.

Description

Technical Field

[0001] This invention relates to the field of high-speed permanent magnet synchronous motor technology, and discloses a rotor structure for a high-speed permanent magnet synchronous motor. Background Technology

[0002] With the development of industrial equipment towards higher speeds, smaller sizes, and higher efficiency, high-speed permanent magnet synchronous motors are widely used in new energy, aerospace, and high-end manufacturing fields due to their advantages such as high power density, high operating efficiency, and good torque characteristics. The rotor, as the core component of a high-speed permanent magnet synchronous motor, directly determines the motor's magnetic properties, high-speed stability, and service life through its structural design.

[0003] The rotors of existing high-speed permanent magnet synchronous motors have the following technical challenges: I. Traditional rotors often use rectangular magnetic isolation structures or single magnetic isolation bridge designs, which cannot adapt to the magnetic field distribution of permanent magnets. This results in incomplete magnetic circuit blocking, serious magnetic leakage, and reduced effective magnetic flux of the motor, which in turn affects the motor's power density and operating efficiency. Second, when rotating at high speed, the rotor is subjected to huge centrifugal force, and the permanent magnet is prone to detach from the mounting slot or loosen. In addition, some rotors are not equipped with effective protective structures, making it difficult to withstand the mechanical load under high-speed conditions, and there is a risk of structural failure. Third, the rotor body is mostly a solid structure or has an unreasonable weight reduction design, resulting in a large overall weight and high rotational inertia. This leads to slow dynamic response speeds such as motor start-up and speed adjustment, which cannot meet the requirements of high-precision control scenarios. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing magnetic shielding, high magnetic leakage rate, insufficient high-speed stability, and limited dynamic performance, and to provide a rotor structure for a high-speed permanent magnet synchronous motor.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows: A rotor structure for a high-speed permanent magnet synchronous motor includes a rotor body, wherein the rotor body is uniformly provided with multiple sets of main mounting slots along the circumference, and a first permanent magnet is installed in each of the multiple sets of main mounting slots. The multiple sets of main mounting slots include a first mounting slot and a second mounting slot. The first mounting slot and the second mounting slot are symmetrically arranged with respect to the axis of the rotor body. The rotor body is provided with a first magnetic isolation bridge for isolating the first mounting slot and the second mounting slot. The first magnetic bridge has a first V-shaped structure, and the opening of the first V-shaped structure faces the outer periphery of the rotor body.

[0006] As a preferred embodiment, the rotor body is provided with multiple sets of auxiliary mounting slots along the circumferential direction, and a second permanent magnet is installed in each of the multiple sets of auxiliary mounting slots, and the multiple sets of auxiliary mounting slots are located radially outside the main mounting slot. The multiple sets of auxiliary mounting slots include a third mounting slot and a fourth mounting slot. The third mounting slot and the fourth mounting slot are symmetrically arranged with respect to the axis of the rotor body. The rotor body is provided with a second magnetic isolation bridge for isolating the third mounting slot and the fourth mounting slot. The second magnetic bridge has a second V-shaped structure, and the opening of the second V-shaped structure faces the outer periphery of the rotor body.

[0007] In a preferred embodiment, the opening angle of the first V-shaped structure is smaller than the opening angle of the second V-shaped structure.

[0008] In a preferred embodiment, the main mounting slots and the first permanent magnet, the auxiliary mounting slots and the second permanent magnet are all fixedly connected by adhesive.

[0009] As a preferred embodiment, a protective sleeve is fixedly connected to the outer peripheral surface of the rotor body, and the protective sleeve is made of high-strength carbon fiber or titanium alloy.

[0010] As a preferred embodiment, the opening angle of the first V-shaped structure is 60°-90°, the opening angle of the second V-shaped structure is 90°-120°, and the length of the first magnetic isolation bridge is 0.6-0.8 times the length of the second magnetic isolation bridge.

[0011] As a preferred embodiment, the rotor body has a shaft hole at its center, a keyway on the inner wall of the shaft hole, and a plurality of weight-reducing holes spaced apart along the outer circumferential surface of the shaft hole.

[0012] In a preferred embodiment, the number of the weight-reducing holes is equal to the number of the main mounting slots, and each weight-reducing hole is located between two adjacent sets of main mounting slots.

[0013] Compared with the prior art, the beneficial effects of this invention are: I. The use of a double-layer magnetic bridge with V-shaped openings facing outwards (first and second magnetic bridges) can precisely block the leakage magnetic path of the main and auxiliary permanent magnets. Combined with the design of the main and auxiliary double-layer permanent magnets, the effective magnetic flux of the motor is improved and the power density is significantly increased. Furthermore, the matching design of the angle and length of the first and second magnetic bridges further optimizes the magnetic circuit distribution and avoids the magnetic saturation problem caused by excessive local magnetic density.

[0014] Second, the dual protective structure, which uses adhesive to fix the permanent magnet and the high-strength sheath, effectively prevents the permanent magnet from loosening or detaching; the rotor body is made of high-strength material, and with the structural reinforcement design of the magnetic bridge, the overall fatigue life is improved.

[0015] Third, the weight-reducing hole design between adjacent main mounting slots reduces the rotor's moment of inertia without affecting magnetic properties and structural strength, shortening motor start-up time and improving speed regulation response, making it suitable for high-precision dynamic control scenarios; at the same time, the lightweight design reduces energy loss during motor operation, improving overall efficiency.

[0016] IV. The standardized design of the shaft hole and keyway can be adapted to motor shafts of different specifications; the symmetrical distribution of the main and auxiliary mounting slots facilitates the batch assembly of permanent magnets, reduces the complexity of the production process, and is suitable for large-scale production. Attached Figure Description

[0017] Figure 1 This is an internal schematic diagram of the rotor structure of the high-speed permanent magnet synchronous motor of the present invention; Figure 2 for Figure 1 A magnified view of part A; Figure 3 This is one of the simulation effect comparison diagrams of the present invention; Figure 4 This is the second simulation effect comparison chart of the present invention. Attached image description: 1. Rotor body; 2. Main mounting slot; 21. First mounting slot; 22. Second mounting slot; 3. The first permanent magnet; 4. First magnetic isolation bridge; 5. Auxiliary mounting slot; 51. Third mounting slot; 52. Fourth mounting slot; 6. Second permanent magnet; 7. Second magnetic bridge; 8. Sheath; 9. Shaft hole; 10. Weight reduction hole. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] refer to Figure 1 , 2 The present invention provides a rotor structure for a high-speed permanent magnet synchronous motor. The rotor structure takes the rotor body 1 as the core carrier. The rotor body 1 is made of high-strength magnetically conductive material (such as non-oriented silicon steel sheet laminate or solid alloy steel) to ensure a balance between magnetic permeability and mechanical strength.

[0021] 1. Mounting of main permanent magnet and magnetic shielding structure The rotor body 1, with its main permanent magnet mounting and magnetic shielding structure, has multiple sets of main mounting slots 2 evenly spaced circumferentially. Each set of main mounting slots 2 is secured with an adhesive, preferably a high-temperature resistant epoxy adhesive, for fixing the first permanent magnet 3. The main mounting slots 2 are divided into symmetrically arranged first mounting slots 21 and second mounting slots 22, which are centrally symmetrical about the axis of the rotor body 1 to ensure rotor dynamic balance. Between the first mounting slots 21 and second mounting slots 22, the rotor body 1 integrally forms a first magnetic shielding bridge 4. This first magnetic shielding bridge 4 has a first V-shaped structure, with the V-shaped opening facing the outer periphery of the rotor body 1. This structure can form a narrow bridge-like blockage along the magnetic field path, significantly reducing the leakage magnetic field rate.

[0022] 2. Auxiliary permanent magnet installation and magnetic shielding structure To further enhance the magnetic performance of the motor, the rotor body 1 has multiple sets of auxiliary mounting slots 5 circumferentially formed on the radially outer side of the main mounting slot 2. Each set of auxiliary mounting slots 5 also has a second permanent magnet 6 fixed within it using adhesive. The multiple sets of auxiliary mounting slots 5 are divided into a third mounting slot 51 and a fourth mounting slot 52, both symmetrical about the axis of the rotor body 1. The third mounting slot 51 and the fourth mounting slot 52 correspond radially to the first mounting slot 21 and the second mounting slot 22, respectively. Between the third mounting slot 51 and the fourth mounting slot 52, the rotor body 1 has a second magnetic isolation bridge 7, which is a second V-shaped structure with its opening facing the outer periphery of the rotor body 1. The opening angle of the first V-shaped structure is smaller than that of the second V-shaped structure, adapting to the different magnetic field distribution requirements of the main and auxiliary permanent magnets and further optimizing the magnetic circuit.

[0023] 3. Key dimensional parameters are limited. To ensure a balance between magnetic shielding performance and structural strength, the present invention limits the dimensions of the core structure: the opening angle of the first V-shaped structure is in the range of 60°-90°, and the opening angle of the second V-shaped structure is in the range of 90°-120°; the length of the first magnetic shielding bridge 4 is 0.6-0.8 times the length of the second magnetic shielding bridge 7, to avoid insufficient structural strength due to the magnetic shielding bridge being too short, or increased magnetic leakage due to the magnetic bridge being too long.

[0024] 4. High-speed protection and lightweight design Protective sleeve 8: A protective sleeve 8 is fixedly connected to the outer circumferential surface of the rotor body 1. The protective sleeve 8 is made of high-strength carbon fiber or titanium alloy. Carbon fiber material has both lightweight and high tensile strength, while titanium alloy material has excellent high temperature resistance and fatigue resistance. It can effectively counteract high-speed centrifugal force and prevent the permanent magnet from separating from the rotor body 1. Weight reduction and assembly structure: A shaft hole 9 is provided at the center of the rotor body 1 for mating with the motor shaft; a keyway is provided on the inner wall of the shaft hole 9 to ensure circumferential fixation of the rotor and the shaft and prevent relative rotation. At the same time, a number of weight reduction holes 10 are spaced apart along the outer circumferential surface of the shaft hole 9. The number of weight reduction holes 10 is equal to the number of main mounting slots 2, and each weight reduction hole 10 is located between two adjacent sets of main mounting slots 2. This design can reduce the rotor weight and reduce the moment of inertia without avoiding critical areas of the magnetic circuit and without affecting the magnetic shielding performance.

[0025] like Figure 3 , 4 As shown, Figure 3 This is a simulation diagram of the stress of the parallel magnetic bridge without the main mounting slot 2 and the auxiliary mounting slot 5. Figure 4 This is a stress simulation diagram of the parallel magnetic isolation bridge with main mounting slot 2 and auxiliary mounting slot 5 in this invention. By comparison, the invention adopts a double-layer magnetic isolation bridge (first magnetic isolation bridge 4 and second magnetic isolation bridge 7) with V-shaped opening facing outward, which can accurately block the leakage magnetic path of the main permanent magnet and the auxiliary permanent magnet. Combined with the design of main and auxiliary double-layer permanent magnets, the effective magnetic flux of the motor is improved and the power density is significantly increased. Moreover, the angle and length matching design of the first and second magnetic isolation bridges 7 further optimizes the magnetic circuit distribution and avoids the magnetic saturation problem caused by excessive local magnetic density.

[0026] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high speed permanent magnet synchronous motor rotor structure, characterized by, Including rotor body (1), the rotor body (1) is uniformly provided with multiple groups of main installation slot (2) along the circumference, multiple groups of the main installation slot (2) are all installed with first permanent magnet (3); Multiple groups of the main installation slot (2) include first installation slot (21) and second installation slot (22), the first installation slot (21) and second installation slot (22) are symmetrically arranged relative to the axis center of the rotor body (1), and the rotor body (1) is provided with first magnetic bridge (4) for isolating first installation slot (21) and second installation slot (22); The shape of the first magnetic bridge (4) is first V-shaped structure, and the opening of the first V-shaped structure faces the outer circumferential side of the rotor body (1).

2. The high-speed permanent magnet synchronous motor rotor structure according to claim 1, characterized in that, Multiple groups of the auxiliary installation slot (5) are all installed with second permanent magnet (6), and multiple groups of the auxiliary installation slot (5) are located on the radial outer side of the main installation slot (2); Multiple groups of the auxiliary installation slot (5) include third installation slot (51) and fourth installation slot (52), the third installation slot (51) and fourth installation slot (52) are symmetrically arranged relative to the axis center of the rotor body (1), and the rotor body (1) is provided with second magnetic bridge (7) for isolating third installation slot (51) and fourth installation slot (52); The shape of the second magnetic bridge (7) is second V-shaped structure, and the opening of the second V-shaped structure faces the outer circumferential side of the rotor body (1).

3. The high-speed permanent magnet synchronous motor rotor structure according to claim 2, characterized by, The opening angle of the first V-shaped structure is less than the opening angle of the second V-shaped structure.

4. The high-speed permanent magnet synchronous motor rotor structure according to claim 3, characterized by, Multiple groups of the main installation slot (2) and first permanent magnet (3), auxiliary installation slot (5) and second permanent magnet (6) are all fixedly connected through adhesive.

5. The high-speed permanent magnet synchronous motor rotor structure according to claim 4, characterized by, The outer circumferential surface of the rotor body (1) is fixedly connected with sheath (8), and the sheath (8) is made of high-strength carbon fiber or titanium alloy material.

6. The high-speed permanent magnet synchronous motor rotor structure according to claim 5, characterized by, The opening angle of the first V-shaped structure is 60°-90°, the opening angle of the second V-shaped structure is 90°-120°, and the length of the first magnetic bridge (4) is 0.6-0.8 times the length of the second magnetic bridge (7).

7. The high-speed permanent magnet synchronous motor rotor structure according to claim 6, characterized by, The shaft hole (9) is provided with a key groove on the inner wall, and the rotor body (1) is provided with a plurality of lightening holes (10) on the outer circumferential surface of the shaft hole (9) in intervals.

8. The high-speed permanent magnet synchronous motor rotor structure according to claim 7, characterized by, The number of the plurality of lightening holes (10) is equal to the number of the main installation slot (2), and each lightening hole (10) is located between the adjacent two groups of main installation slot (2).

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