A layered rotor structure and manufacturing method for a high-speed permanent magnet motor

Abstract

A layered rotor structure and manufacturing method for a high-speed permanent magnet motor, comprising a rotor core, a permanent magnet, and a protective sleeve sequentially arranged from the inside to the outside along the radial direction. The permanent magnet is sleeved outside the rotor core, and a block-shaped ferrite material filler for reducing the deformation stress of the permanent magnet is arranged at the gap formed between adjacent protruding blocks of the permanent magnet; the protective sleeve includes an inner carbon fiber layer, a mixed layer, a copper shielding layer, and an outer carbon fiber layer sequentially arranged from the inside to the outside along the radial direction; the mixed layer includes a carbon fiber pre-wound tape, which is formed by flatly bonding a flexible magnetic powder adhesive film on the surface of the carbon fiber tape, and the flexible magnetic powder adhesive film is formed by spraying and curing a film preform uniformly mixed with bonded permanent magnet magnetic powder and a gum material. It effectively reduces the rotor eddy current loss and air friction loss, alleviates the risk of permanent magnet damage caused by excessive local stress inside the rotor, and enables the high-speed permanent magnet motor to develop towards higher speeds and greater powers.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-speed permanent magnet motors, and in particular relates to a high-speed permanent magnet motor layered surface-mounted rotor structure and a manufacturing method thereof. Background Art

[0002] High-speed permanent magnet motors have the advantages of small size and high power density. They are widely used in high-speed drive systems such as machine tool spindle motors, high-speed turbine machinery, and micro gas turbine power generation equipment.

[0003] At present, the rotor of high-speed permanent magnet motor mainly adopts the structure of block permanent magnet surface-mounted with external sheath. Since the permanent magnet is subjected to great centrifugal tensile stress when the rotor rotates at high speed, and the sintered permanent magnet with high magnetic properties has low tensile strength, it must be protected by an external sheath. However, the non-metallic sheath of the permanent magnet sheath will affect the heat dissipation of the permanent magnet, and the eddy current loss of the metal sheath will also cause the temperature rise of the permanent magnet to be too high. In addition, the air gap magnetic field formed by the existing surface-mounted permanent magnet is distributed in a flat-top wave, which contains more high-order harmonics, and will also cause the eddy current loss inside the motor to increase; the local stress at the edge of the block permanent magnet is higher than that at other positions, which is easy to cause permanent magnet damage.

[0004] In summary, the existing high-speed permanent magnet motor rotor structure with a surface-mounted permanent magnet and a sheath structure has problems such as high temperature rise, large loss, local stress concentration, and high harmonic content in the air gap magnetic field waveform, which limits the improvement space of its maximum power and maximum speed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a layered rotor structure and manufacturing method for a high-speed permanent magnet motor, which effectively reduces rotor eddy current loss and air friction loss, alleviates the risk of permanent magnet damage caused by excessive local stress inside the rotor, improves the air gap magnetic field waveform generated by the permanent magnet, and breaks through the technical difficulties of the high-speed permanent magnet motor to develop to higher speed and greater power. At the same time, it also effectively improves the rotor operation reliability of the layered rotor structure for high-speed permanent magnet motors.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A layered rotor structure for a high-speed permanent magnet motor, comprising a rotor core, a permanent magnet, and a protective sleeve arranged successively from the inside to the outside in the radial direction. The permanent magnet is sleeved outside the rotor core. A block-shaped ferrite material filler for reducing the deformation stress of the permanent magnet is arranged at the gap formed between adjacent protruding blocks of the permanent magnet, and the permanent magnet and the block-shaped ferrite material filler form an annular body. The protective sleeve is composed of an inner carbon fiber layer, a mixed layer, a copper shielding layer, and an outer carbon fiber layer arranged successively from the inside to the outside in the radial direction. The inner carbon fiber layer is arranged outside the annular body, the mixed layer is arranged outside the inner carbon fiber layer, the copper shielding layer is arranged outside the mixed layer, and the outer carbon fiber layer is arranged outside the copper shielding layer.

[0008] The mixed layer is a multi-layer structure, which is an equal-thickness layer, a variable-thickness layer, or a mixed structure of equal-thickness and variable-thickness formed by circumferentially winding carbon fiber pre-wound tapes. The carbon fiber pre-wound tape includes a carbon fiber tape, and a flexible magnetic powder adhesive film is flatly bonded to the upper surface of the carbon fiber tape to form the carbon fiber pre-wound tape. The flexible magnetic powder adhesive film is formed by mixing bonded permanent magnet magnetic powder and a gum material in a volume ratio of 2:1.

[0009] The single-layer thickness of the flexible magnetic powder adhesive film ≤ 0.3 mm.

[0010] The minimum single-layer thickness of the carbon fiber pre-wound tape ≥ 0.3 mm.

[0011] The mixed layer is an equal-thickness layer, a variable-thickness layer, or a mixed structure of an equal-thickness layer and a variable-thickness layer. The equal-thickness layer is formed by winding equal-thickness carbon fiber pre-wound tapes, and the equal-thickness carbon fiber pre-wound tapes are formed by bonding flexible magnetic powder adhesive films from the inside to the outside in the radial direction. The variable-thickness layer is formed by winding carbon fiber pre-wound tapes with gradually variable thickness, and the carbon fiber pre-wound tapes with variable thickness gradually become thinner by bonding flexible magnetic powder adhesive films from the inside to the outside in the radial direction. The mixed structure of equal-thickness and variable-thickness is formed by winding a variable-thickness carbon fiber pre-wound layer into a variable-thickness layer, and an equal-thickness carbon fiber pre-wound tape is wound outside the variable-thickness layer.

[0012] The permanent magnet includes an annular base body, and outwardly protruding blocks are integrally formed on the outer circumferential surface of the annular base body along the circumference. Multiple grooves with triangular, semi-circular, trapezoidal, or rectangular cross-sections are machined along the radial direction on the contact surface between the blocks and the block-shaped ferrite material filler, so that the block-shaped ferrite material filler is tightly connected to the permanent magnet, improving the connection strength at the connection.

[0013] The inner carbon fiber layer applies a compressive stress ≥ 200 Mpa to the outer surfaces of the permanent magnet and the block-shaped ferrite material filler in the radial direction inward.

[0014] The volume density of the block-shaped ferrite material filler is distributed in a cosine distribution along the circumferential direction.

[0015] The inner carbon fiber layer is a multi-layer structure with the number of layers ≤ 4 and the thickness of a single layer ≤ 0.15 mm.

[0016] The thickness of a single layer of the outer carbon fiber layer ≤ 2 mm and the surface roughness ≤ 0.1 mm.

[0017] A manufacturing method of a layered rotor structure for a high-speed permanent magnet motor includes the following steps:

[0018] Step 1: A film preform made by uniformly mixing bonded permanent magnet powder and a gum material in a volume ratio of 2:1 is sprayed through a nozzle and cured to form a flexible magnetic powder film with a thickness ≤ 0.3 mm. Then, the flexible magnetic powder film is flatly bonded to the surface of a carbon fiber tape to form a carbon fiber pre-wound tape.

[0019] Step 2: A permanent magnet is sleeved on the outer circumferential surface of a rotor core, and a block-shaped ferrite material filler is filled in the gaps formed between the raised blocks of the permanent magnet. The inner carbon fiber layer is wound around the outside of the ring formed by the permanent magnet and the block-shaped ferrite material filler by applying a tensile stress. The carbon fiber pre-wound tape made in Step 1 is wound around the outside of the inner carbon fiber layer by applying a tensile stress to form a mixed layer. A copper shielding layer is sleeved on the outside of the mixed layer. The outer carbon fiber layer is wound around the outside of the copper shielding layer by applying a tensile stress, and the installation of the layered rotor structure for the high-speed permanent magnet motor is completed.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The film preform made by uniformly mixing bonded permanent magnet powder and a gum material is sprayed and cured to form a flexible magnetic powder film, and then the flexible magnetic powder film is flatly bonded to the surface of a carbon fiber tape to form a carbon fiber pre-wound tape. The carbon fiber pre-wound tape is wound around the outside of the inner carbon fiber layer to form a mixed layer. By manufacturing the mixed layer according to the above method, it is not only simple to operate, but also has high reliability, stable structure, wide applicability. At the same time, by making flexible magnetic powder films with different structures, it is easy to adjust the structures of the carbon fiber pre-wound tape and the mixed layer.

[0022] 2. A circumferentially homogeneous distribution pattern of permanent magnets is achieved by adding permanent magnet powder between carbon fiber layers. While winding the carbon fiber layers to protect the internal massive permanent magnets, it enhances the air-gap magnetic field. By adjusting the circumferential sinusoidal distribution of the permanent magnet content density, a sinusoidal distribution of the air-gap magnetic field is realized. The outer copper shielding layer further reduces the penetration depth of high-frequency magnetic fields, thereby effectively reducing the eddy current loss generated by high-frequency magnetic fields. Adding permanent magnet powder between carbon fiber layers avoids excessive local stress in the massive permanent magnets and effectively reduces the risk of permanent magnet breakage while generating a magnetic field. After surface processing of the carbon fiber layer on the outer layer of the rotor, the air friction loss can be effectively reduced. Therefore, the proposed layered rotor structure in the present invention breaks through the technical problems in the development of high-speed permanent magnet motors towards higher speeds and greater powers, thereby effectively improving the reliability of high-speed rotor operation.

[0023] 3. When the rotor rotates at high speed, under the action of a large centrifugal tensile stress, the integral permanent magnet has the effects of high tensile strength and uniform circumferential contact stress. And multiple grooves with triangular, semi-circular, trapezoidal or rectangular cross-sections are machined along the radial direction on the contact surface between the permanent magnet and the massive ferrite material filler, making the connection between the massive ferrite material filler and the permanent magnet closer and improving the connection strength at the connection.

[0024] 4. The magnetic powder in the equal-thickness layer magnetic powder adhesive film is evenly distributed, and the magnetic field distribution formed after magnetization is also uniform, which is suitable for high-speed permanent magnet motors with square-wave magnetic fields; the equal-thickness layer is formed by winding prepreg tapes. When winding, a large pre-tension can be applied to make the pre-pressure of the magnetic powder adhesive film layer greater and the fastening stronger, which is suitable for ultra-high-speed permanent magnet motors. Since the magnetic powder in the variable-thickness layer is located at a smaller circumferential radius, the centrifugal tensile stress it receives is smaller, and the single-layer carbon fiber can carry a greater thickness of magnetic powder. By winding the variable-thickness layer according to the rule that the magnetic powder thickness is large in the inner layer and small in the outer layer, an effect of higher magnetic powder density per unit volume can be achieved, effectively utilizing the magnetic powder material, improving the motor air-gap magnetic field and enhancing the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an axial structure schematic diagram of a layered rotor structure for a high-speed permanent magnet motor;

[0026] Figure 2 is a schematic diagram of spraying a flexible magnetic powder adhesive film;

[0027] Figure 3 is a cross-sectional view of a carbon fiber pre-winding tape;

[0028] Figure 4 is a schematic diagram of the structure of the equal-thickness layer;

[0029] Figure 5 is a schematic diagram of the structure of the variable-thickness layer;

[0030] Figure 6 Schematic diagram of a mixed structure of an equal-thickness layer and a variable-thickness layer;

[0031] 1. Rotor core, 2. Permanent magnet, 3. Bulk ferrite material filler, 4. Inner carbon fiber layer, 5. Hybrid layer, 6. Copper shielding layer, 7. Outer carbon fiber layer, 51. Film preform, 52. Carbon fiber tape, 53. Sprayer, 54. Flexible magnetic powder film, 55. Equal-thickness layer, 56. Variable-thickness layer. Specific embodiments

[0032] To facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings of the specification and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0033] Embodiment 1

[0034] As Figures 1 to 4As shown in the figure, a layered rotor structure for a high-speed permanent magnet motor includes a rotor core 1, a permanent magnet 2, and a protective sleeve arranged in sequence from the inside to the outside along the radial direction. The permanent magnet 2 is a rare earth permanent magnet. The permanent magnet 2 includes an annular matrix. Block-shaped protrusions are integrally formed on the outer circumferential surface of the annular matrix along the circumferential direction. Grooves with a triangular cross-section are machined along the radial direction on the contact surface between the block-shaped protrusions and the block-shaped ferrite material filling body 3. The permanent magnet 2 is sleeved on the outer surface of the rotor core 1 and fixed by bonding. The permanent magnet 2 generally has a large remanence and generates a large air-gap magnetic density. Since the average radius of its position is small, the stress caused by the centrifugal force is very small, which can effectively reduce the risk of the permanent magnet 2 being damaged by force. A block-shaped ferrite material filling body 3 is arranged at the gap formed between adjacent permanent magnets 2. The volume density of the block-shaped ferrite material filling body 3 is distributed in a cosine pattern along the circumferential direction; the permanent magnet 2 is prone to deformation after being affected by temperature. Since the mechanical properties of the block-shaped ferrite material filling body 3 are the same as those of the permanent magnet 2, a ring body with the same mechanical properties is formed together with the permanent magnet 2, and the deformation stress and mechanical stress are uniform, avoiding the risk of excessive local stress of the permanent magnet 2 during high-speed rotation of the rotor; at the same time, the remanence intensity of the block-shaped ferrite material filling body 3 is lower than that of the permanent magnet 2, and a variable magnetic density magnetic field is formed in the circumferential direction in combination with the permanent magnet 2. The waveform of its variable magnetic density magnetic field has a higher sinusoidality than the waveform of the magnetic field generated by using only the permanent magnet 2; the high-speed surface-mounted permanent magnet motor with this structure is integrally magnetized, and a magnetic field distributed in a nearly sinusoidal pattern along the circumferential direction will be formed on its outer surface; the protective sleeve includes an inner carbon fiber layer 4, a mixed layer 5, a copper shielding layer 6, and an outer carbon fiber layer 7 arranged in sequence from the inside to the outside along the radial direction; the inner carbon fiber layer 4 is a multi-layer structure with 4 layers, and the single-layer thickness is 0.15 mm. The inner carbon fiber layer 4 is wound around the outside of the permanent magnet 2 by applying a tensile stress, and a large pre-pressure is applied during the winding process to ensure that after the winding is completed, a compressive stress of 350 MPa is applied to the outer surfaces of the permanent magnet 2 and the block-shaped ferrite material filling body 3 along the radial direction inward. This can not only make the permanent magnet 2 and the filling body 3 wrapped therein into one body, but also ensure that when the rotor rotates at high speed, neither the block-shaped ferrite material filling body 3 nor the magnet block 2 bears tensile stress, avoiding the damage of the permanent magnet 2 caused by excessive tensile stress; the mixed layer 5 is wound around the outside of the inner carbon fiber layer 4 by applying a tensile stress, and the copper shielding layer 6 is sleeved on the outside of the mixed layer 5 by an interference fit. The copper shielding layer 6 can effectively shield the high-frequency time-varying magnetic field harmonics introduced when the stator winding is powered by an inverter and the high-frequency space magnetic field harmonics caused by the motor structure. Therefore, it can effectively reduce the eddy current loss caused by the high-frequency magnetic field inside the rotor and also reduce the rotor temperature rise, thereby further improving the maximum power of the motor. The outer carbon fiber layer 7 is wound around the outside of the copper shielding layer 6 by applying a tensile stress. The single-layer thickness of the outer carbon fiber layer 7 is 2 mm, and the surface roughness is 0.1 mm. The surface roughness of the rotor outer surface is lower than 0.1 mm, effectively reducing the air friction loss generated during high-speed rotation, thereby effectively reducing the loss and temperature rise on the rotor, and further improving the efficiency of the motor.

[0035] The hybrid layer 5 is a multi-layer structure, which is formed by circumferentially winding the carbon fiber pre-wound tape in a cycle; the carbon fiber pre-wound tape includes a carbon fiber tape 52, and the film preform 51 formed by uniformly mixing the bonded permanent magnet powder and the gum material is sprayed and cured through a nozzle 53 to form a flexible magnetic powder film 54 with a thickness of 0.3 mm. Then, the flexible magnetic powder film 54 is flatly bonded to the surface of the carbon fiber tape 52 to form the carbon fiber pre-wound tape. The minimum single-layer thickness of the carbon fiber pre-wound tape is 0.3 mm. The carbon fiber pre-wound tape is wound outside the inner carbon fiber layer 4 to form the hybrid layer 5. By adjusting the spraying amount of the film preform 51, the thickness of the flexible magnetic powder film 54 is adjusted, and then the thickness of the carbon fiber pre-wound tape is adjusted.

[0036] Due to the mixing of the bonded permanent magnet powder and the gum material, an insulating layer is formed between the magnetic powder particles, which can increase the conductivity between the magnetic powder particles, thereby reducing the eddy current loss generated by the magnetic powder and reducing the total loss and temperature rise of the rotor. In addition, each layer of the flexible magnetic powder film 54 is fastened by a layer of carbon fiber tape 52 on the outside, which can enhance the strength of the rotor after winding and help improve the upper limit of the maximum rotational speed of the motor.

[0037] The hybrid layer 5 is an equal-thickness layer 55, that is, the multi-layer equal-thickness structure of the hybrid layer 5. After the film preform 51 is sprayed and cured, a uniform and equal-thickness flexible magnetic powder film 54 is formed, that is, the flexible magnetic powder film 54 is uniformly distributed in the circumferential direction. The flexible magnetic powder film 54 is bonded to the surface of the carbon fiber tape 52 to form an equal-thickness carbon fiber pre-wound tape; when the rotor rotates at a high speed, the stress inside the hybrid layer 5 of this structure is uniformly distributed, thus avoiding the problem of excessive local stress.

[0038] A manufacturing method of a layered rotor structure for a high-speed permanent magnet motor includes the following steps:

[0039] Step 1, the film preform 51 formed by uniformly mixing the bonded permanent magnet powder and the gum material in a volume ratio of 2:1 is sprayed and cured through a nozzle 53 to form a flexible magnetic powder film 54 with a thickness of 0.3 mm. Then, the flexible magnetic powder film 54 is flatly bonded to the surface of the carbon fiber tape 52 to form the carbon fiber pre-wound tape;

[0040] Step 2: Sheath the permanent magnet 2 on the outer circumferential surface of the rotor core 1, and fill the gaps formed between the protruding blocks of the permanent magnet 2 with the block ferrite material filling body 3; wind the inner carbon fiber layer 4 around the outside of the annular body jointly formed by the permanent magnet 2 and the block ferrite material filling body 3 by applying a tensile stress; wind the carbon fiber pre-wound tape made in Step 1 around the outside of the inner carbon fiber layer 4 by applying a tensile stress to form a hybrid layer 5; sheath the copper shielding layer 6 on the outside of the hybrid layer 5; wind the outer carbon fiber layer 7 around the outside of the copper shielding layer 6 by applying a tensile stress, and the hierarchical rotor structure for the high-speed permanent magnet motor is installed and completed.

[0041] Embodiment 2

[0042] The difference between this embodiment and Embodiment 1 is that, as Figure 5 shown, the hybrid layer 5 is a variable-thickness layer 56, that is, the hybrid layer 5 is a multi-layer variable-thickness structure, that is, a structure with a thick inner layer and a thin outer layer. By adjusting the spraying amount of the adhesive film preform 51, the thickness of the flexible magnetic powder adhesive film 54 is further adjusted, so that the carbon fiber pre-wound tape forms a variable-thickness structure.

[0043] Since the inner layer has a small radius, the local stress generated by the centrifugal force on the carbon fiber pre-wound tape of the same volume is small. Therefore, when making the carbon fiber pre-wound tape bonded to the inner layer, by reducing the spraying amount of the adhesive film preform 51 and further reducing the thickness of the flexible magnetic powder adhesive film 54, the magnetic powder volume near the air gap is made more, and thus the air gap magnetic density generated after magnetization can be made larger, effectively utilizing the magnetic material.

[0044] Embodiment 3

[0045] The difference between this embodiment and Embodiment 1 is that, as Figure 6 shown, the hybrid layer 5 is a hybrid structure of an equal-thickness layer 55 and a variable-thickness layer 56, including an inner layer and an outer layer distributed along the direction, that is, the inner layer of the hybrid layer 5 is the variable-thickness layer 56, and the outer layer of the hybrid layer 5 is the equal-thickness layer 55.

[0046] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, the improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A hierarchical rotor structure for a high-speed permanent magnet motor, characterized in that, It includes a rotor core, a permanent magnet, and a protective sleeve arranged radially from the inside out in sequence. The permanent magnet is sleeved outside the rotor core. A block-shaped ferrite material filler for reducing the deformation stress of the permanent magnet is arranged at the gap formed between adjacent protruding blocks of the permanent magnet. The permanent magnet and the block-shaped ferrite material filler form an annular body. The protective sleeve is composed of an inner carbon fiber layer, a mixed layer, a copper shielding layer, and an outer carbon fiber layer arranged radially from the inside out in sequence. The inner carbon fiber layer is arranged outside the annular body, the mixed layer is arranged outside the inner carbon fiber layer, the copper shielding layer is arranged outside the mixed layer, and the outer carbon fiber layer is arranged outside the copper shielding layer. The mixed layer is a multi-layer structure, which is an equal-thickness layer, a variable-thickness layer, or a mixed structure of equal-thickness and variable-thickness formed by winding carbon fiber pre-wound tapes circumferentially. The carbon fiber pre-wound tape includes a carbon fiber tape. A flexible magnetic powder adhesive film is flatly bonded to the upper surface of the carbon fiber tape to form a carbon fiber pre-wound tape. The flexible magnetic powder adhesive film is formed by mixing bonded permanent magnet magnetic powder and a gum material according to a volume ratio of 2:

1.

2. The hierarchical rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The single-layer thickness of the flexible magnetic powder adhesive film ≤ 0.3mm.

3. A layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The single-layer thickness of the carbon fiber pre-wound tape ≥ 0.3mm.

4. A layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The mixed layer is an equal-thickness layer, a variable-thickness layer, or a mixed structure of an equal-thickness layer and a variable-thickness layer. The equal-thickness layer is formed by winding carbon fiber pre-wound tapes of equal thickness. The carbon fiber pre-wound tapes of equal thickness are formed by bonding flexible magnetic powder adhesive films radially from the inside out. The variable-thickness layer is formed by winding carbon fiber pre-wound tapes with gradually changing thickness. The carbon fiber pre-wound tapes with gradually changing thickness gradually become thinner by bonding flexible magnetic powder adhesive films radially from the inside out. The mixed structure of equal-thickness and variable-thickness is formed by winding a variable-thickness carbon fiber pre-wound layer into a variable-thickness layer, and winding carbon fiber pre-wound tapes of equal thickness outside the variable-thickness layer.

5. A layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The permanent magnet includes an annular base body. Outwardly protruding blocks are integrally formed on the outer circumferential surface of the annular base body along the circumference. And multiple grooves with triangular, semi-circular, trapezoidal, or rectangular cross-sections are machined along the radial direction on the contact surface between the blocks and the block-shaped ferrite material filler, so that the block-shaped ferrite material filler is tightly connected to the permanent magnet, improving the connection strength at the connection.

6. The hierarchical rotor structure for a high-speed permanent magnet motor according to claim 1, wherein: The inner carbon fiber layer applies a compressive stress ≥ 200Mpa to the outer surface of the permanent magnet and the block-shaped ferrite material filler radially inward.

7. A layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The volume density of the block-shaped ferrite material filler is distributed in a cosine manner along the circumferential direction.

8. A layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The inner carbon fiber layer is a multi-layer structure, with the number of layers ≤ 4 layers and the single-layer thickness ≤ 0.15mm.

9. A layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that: The single-layer thickness of the outer carbon fiber layer ≤ 2mm, and the surface roughness ≤ 0.1mm.

10. The installation method of a layered rotor structure for a high-speed permanent magnet motor according to claim 1, characterized in that, It includes the following steps: Step 1, a film preform made by uniformly mixing bonded permanent magnet magnetic powder and a gum material according to a volume ratio of 2:1 is sprayed through a nozzle and cured to make a flexible magnetic powder adhesive film with a thickness ≤ 0.3mm. Then the flexible magnetic powder adhesive film is flatly bonded to the surface of the carbon fiber tape to form a carbon fiber pre-wound tape. Step 2, sleeved the permanent magnet on the outer circumferential surface of the rotor core, and filled the gap formed between the raised blocks of the permanent magnet with a block-shaped ferrite material filler; wound the inner carbon fiber layer around the outside of the ring formed jointly by the permanent magnet and the block-shaped ferrite material filler by applying a tensile stress; wound the carbon fiber pre-wound tape made in Step 1 around the outside of the inner carbon fiber layer by applying a tensile stress to form a hybrid layer; sleeved the copper shielding layer on the outside of the hybrid layer; wound the outer carbon fiber layer around the outside of the copper shielding layer by applying a tensile stress, and the layered rotor structure for the high-speed permanent magnet motor was installed and completed.

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