CN113285540B - Novel high-speed motor multilayer variable magnetic load composite rotor structure and manufacturing method - Google Patents

Novel high-speed motor multilayer variable magnetic load composite rotor structure and manufacturing method Download PDF

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CN113285540B
CN113285540B CN202110810543.XA CN202110810543A CN113285540B CN 113285540 B CN113285540 B CN 113285540B CN 202110810543 A CN202110810543 A CN 202110810543A CN 113285540 B CN113285540 B CN 113285540B
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permanent magnet
magnetic material
carbon fiber
composite
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CN113285540A (en
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张岳
王惠军
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Shandong University
Beihang University
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Beihang University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
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    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32—LAYERED PRODUCTS
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    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

The invention discloses a novel high-speed motor multilayer variable magnetic load composite rotor structure and a manufacturing method thereof, wherein magnetic powder adhesive films are used for filling interpoles of sintered permanent magnets, and after the integral molding of the sintered permanent magnets is finished, the sintered permanent magnets can be equivalently formed into a ring, so that the deformation stress of the permanent magnets can be reduced, the air gap magnetic density of a high-speed motor is improved, the damage to a carbon fiber protective sleeve caused by stress concentration due to interpole gaps of the sintered permanent magnets is avoided, the reliability of the high-speed motor rotor is improved, and the problem of stress concentration of the high-speed motor rotor is solved, so that the key technical problem of the development of the high-speed motor to high power and high rotating speed is solved. The annular bonded permanent magnet can also be an annular bonded permanent magnet, the magnetic performance of the annular bonded permanent magnet is slightly inferior to that of a sintered permanent magnet, but the stress performance of the annular bonded permanent magnet is superior to that of the sintered permanent magnet due to the fact that the annular bonded permanent magnet is an integral piece, and the problem of stress concentration of a high-speed motor rotor can also be solved.

Description

Novel high-speed motor multilayer variable magnetic load composite rotor structure and manufacturing method
Technical Field
The invention relates to the technical field of motor rotor preparation, in particular to a novel high-speed motor multilayer variable magnetic load composite rotor structure and a manufacturing method thereof.
Background
The high-speed permanent magnet motor has wide application prospects in the fields of aerospace, flywheel energy storage and the like, however, the rotor temperature rise and the local stress of the traditional surface-mounted high-speed permanent magnet motor become key technologies for the development of the high-speed motor towards high power and high rotating speed.
The Chinese application 201280029583.X provides a magnetic-load composite material rotor and a method for preparing a magnetic-load prepreg tape, which provides a basis for the research of a high-speed permanent magnet motor composite rotor, but does not consider the variation trend of radial centrifugal force of a motor under the condition of high rotating speed, and has the problems of inner-layer carbon fiber waste and over-low unit volume magnetic powder adhesive film. The chinese application 202010969975.0 proposes a method for manufacturing a composite rotor by winding a composite magnetic material in a circumferential direction in a perpendicular manner, which provides a basis for winding the composite magnetic material for a high-speed permanent magnet motor, but does not consider the influence of the centrifugal force of the high-speed rotor on the composite magnetic material and the winding method of the composite magnetic material with a thickness variation of magnetic powder films. Chinese application 202010970896.1 proposes a layered rotor structure for a high-speed permanent magnet motor and a manufacturing method thereof, in which the problem of stress concentration due to the inter-electrode gap of the sintered permanent magnets still exists because of the existence of the sintered permanent magnets.
Disclosure of Invention
In view of this, the invention provides a novel high-speed motor multilayer variable magnetic load composite rotor structure and a manufacturing method thereof, which are used for solving the problem of stress concentration of a high-speed motor rotor.
The invention provides a novel high-speed motor multilayer variable magnetic load composite rotor structure, which comprises: the device comprises a rotating shaft, an annular permanent magnet wrapped on the side surface of the rotating shaft, a plurality of layers of composite magnetic material layers wound on the outer surface of the annular permanent magnet in a layered mode, and a carbon fiber protective sleeve in interference fit with the plurality of layers of composite magnetic material layers; wherein the content of the first and second substances,
the annular permanent magnet comprises a plurality of tile-shaped sintered permanent magnets adhered to the side surface of the rotating shaft and magnetic powder adhesive films filled between the sintered permanent magnets; alternatively, the first and second electrodes may be,
the annular permanent magnet is an annular bonded permanent magnet which is in interference fit with the rotating shaft.
In a possible implementation mode, the novel high-speed motor provided by the invention has a multi-layer variable magnetic load composite rotorIn the substructure, the outer surface of the annular permanent magnet is wound withNA layer composite magnetic material layer; each layer of composite magnetic material layer comprises a carbon fiber layer and a magnetic powder adhesive film paved on the carbon fiber layer, wherein in each layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the magnetic powder adhesive film is arranged inside, and the carbon fiber layer is arranged outside;
in the first layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 3.8-4: 1; a second winding wound on the outer surface of the annular permanent magnetNIn the layer composite magnetic material layer, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 0.8-1: 1;
second to fourth layers wound around the outer surface of the annular permanent magnetNIn 1 layer of composite magnetic material layer, the thickness of the magnetic powder adhesive film is according to the formula
Figure 490397DEST_PATH_IMAGE001
Gradually decrease in the direction of the flow, wherein,d ex is shown in the second to the third layersN1 the reduced thickness of the magnetic powder glue film in each of the layers relative to the magnetic powder glue film in the previous layer,k s the thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the first layer is shown,k e is shown asNThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the layer,d c is the thickness of the carbon fiber layer in each composite magnetic material layer.
In a possible implementation manner, in the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, the structure further includes:
the single-layer carbon fiber layer is arranged between the annular permanent magnet and the multiple layers of composite magnetic material layers and is used for increasing the friction force when the composite magnetic material layers are wound and reducing the radial tensile stress of the annular permanent magnet;
the single-layer carbon fiber layer between the multilayer composite magnetic material layer and the carbon fiber protective sleeve is used for preventing the composite magnetic material layer from falling off due to interference assembly.
In a possible implementation manner, in the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, the structure further includes: and the epoxy resin coatings are positioned on the surfaces of the two axial ends of the composite magnetic material layer and are used for preventing the magnetic powder adhesive film from being oxidized and being lost under the action of centrifugal force under the condition of high rotating speed.
The invention also provides a manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure, which comprises the following steps:
s1: mixing the magnetic powder with an epoxy resin binder, a coupling agent, a curing agent and a plasticizer, and stirring at a first preset temperature to obtain a magnetic powder adhesive film;
s2: cleaning the side surface of the rotating shaft;
s3: sticking four tile-shaped sintered permanent magnets on the side surface of the rotating shaft, filling magnetic powder glue films between the sintered permanent magnets, putting the sintered permanent magnets into a curing furnace, and performing rotary heating curing at a second preset temperature for a first preset time; or, the rotating shaft and the annular bonded permanent magnet are assembled in an interference fit manner;
s4: step-shaped alloy baffles are respectively arranged at two ends of the rotating shaft provided with the annular permanent magnet; the alloy baffle comprises a small step inside and a large step outside, the outer diameter of the small step is the same as that of the annular permanent magnet, and the outer diameter of the large step is larger than or equal to that of the finally formed rotor;
s5: the servo motor is used for driving the rotating shaft to rotate, the magnetic powder adhesive film is paved on the carbon fiber layer by the nozzle and then wound on the outer surface of the annular permanent magnet, the composite magnetic material layer is placed into a curing furnace after being wound, and the curing furnace is rotated, heated and cured at a third preset temperature for a second preset time; wherein, the circumferential linear speed of the rotation of the servo motor is constant;
s6: after the solidification is finished, the carbon fiber protective sleeve and the composite magnetic material layer are in interference fit;
s7: after the assembly is completed, the alloy baffle is disassembled after the rotation heating solidification is carried out at the fourth preset temperature for the third preset time, and finally, the mechanical processing is carried out to obtain the composite rotor structure.
In a possible implementation manner, in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, in step S1, the first preset temperature is 50 ℃ to 60 ℃.
In a possible implementation manner, in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the present invention, after the step S3 is executed and before the step S4 is executed, the method further includes:
winding a single-layer carbon fiber layer on the outer surface of the annular permanent magnet;
in step S5, after the winding of the composite magnetic material layer is completed and before the composite magnetic material layer is placed in the curing oven, the method further includes:
and winding a single-layer carbon fiber layer on the surface of the composite magnetic material layer.
In a possible implementation manner, in the method for manufacturing the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, in the step S5, the servo motor is used to drive the rotating shaft to rotate, and the nozzle is used to coat the magnetic powder adhesive film on the carbon fiber layer and then wind the carbon fiber layer around the outer surface of the annular permanent magnet, the method specifically includes:
detecting the number of winding turns through a Hall element arranged on the bottom surface of the rotating shaft, and controlling the amount of the magnetic powder adhesive film sprayed out from the nozzle by using a linear control system according to the number of winding turns; in each layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the magnetic powder adhesive film is arranged inside, and the carbon fiber layer is arranged outside; in the first layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 3.8-4: 1; a second winding wound on the outer surface of the annular permanent magnetNIn the layer composite magnetic material layer, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 0.8-1: 1; second to fourth layers wound around the outer surface of the annular permanent magnetNIn 1 layer of composite magnetic material layer, the thickness of the magnetic powder adhesive film is according to the formula
Figure 220456DEST_PATH_IMAGE002
Is gradually loweredWherein, in the step (A),d ex is shown in the second to the third layersN1 the reduced thickness of the magnetic powder glue film in each of the layers relative to the magnetic powder glue film in the previous layer,k s the thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the first layer is shown,k e is shown asNThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the layer,d c the thickness of the carbon fiber layer in each composite magnetic material layer;
in step S5, after the winding of the composite magnetic material layer is completed and before the composite magnetic material layer is placed in the curing oven, the method further includes:
and (5) disassembling the Hall element.
In a possible implementation manner, in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, in the step S3, the second preset temperature is 120-130 ℃, and the first preset time is 1-2 h;
in the step S5, the third preset temperature is 120-130 ℃, and the second preset time is 1-2 h;
in the step S7, the fourth preset temperature is 120-130 ℃, and the third preset time is 1-2 hours.
In a possible implementation manner, in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, after the step S7 is executed, after the assembly is completed, and after the solidification is performed at a fourth preset temperature for a third preset time, the alloy baffle is detached, and finally, the mechanical processing is performed, so as to obtain the composite rotor structure, the method further includes the following steps:
s8: and coating epoxy resin coatings on the surfaces of the two axial ends of the composite magnetic material layer.
According to the novel high-speed motor multilayer variable magnetic load composite rotor structure and the manufacturing method thereof, the magnetic powder adhesive film is used for filling the interpoles of the sintered permanent magnet, and after the integral molding of the sintered permanent magnet is completed, the sintered permanent magnet can be equivalently formed into a ring, so that the deformation stress of the permanent magnet can be reduced, the air gap magnetic density of the high-speed motor can be improved, the damage to a carbon fiber protective sleeve caused by stress concentration due to interpole gaps of the sintered permanent magnet can be avoided, the reliability of the high-speed motor rotor can be improved, the problem of stress concentration of the high-speed motor rotor can be solved, and the key technical problem of the development of the high-speed motor to high power and high rotating speed can be solved. The annular bonded permanent magnet can also be an annular bonded permanent magnet, the magnetic performance of the annular bonded permanent magnet is slightly inferior to that of a sintered permanent magnet, but the stress performance of the annular bonded permanent magnet is superior to that of the sintered permanent magnet due to the fact that the annular bonded permanent magnet is an integral piece, and the problem of stress concentration of a high-speed motor rotor can also be solved.
Drawings
FIG. 1 is a schematic view of a novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention;
FIG. 2 is a partial schematic view of FIG. 1;
FIG. 3 is a flow chart of a method for manufacturing a novel high-speed motor multilayer variable magnetic load composite rotor structure according to the present invention;
FIG. 4 is a schematic view showing the installation of a stepped alloy baffle plate in example 1 of the present invention;
fig. 5 is a schematic diagram of winding of the composite magnetic material in embodiment 1 of the present invention.
Description of reference numerals: a rotating shaft 1; an annular permanent magnet 2; a multilayer composite magnetic material layer 3; a carbon fiber protective sheath 4; a single-layer composite magnetic material layer 5; a carbon fiber layer 6; a magnetic powder adhesive film 7; an alloy baffle plate 8; a nozzle 9; a hall element 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only illustrative and are not intended to limit the present invention.
The invention provides a novel high-speed motor multilayer variable magnetic load composite rotor structure, as shown in figure 1, comprising: the magnetic rotor comprises a rotating shaft 1, an annular permanent magnet 2 wrapped on the side surface of the rotating shaft 1, a plurality of layers of composite magnetic material layers 3 wound on the outer surface of the annular permanent magnet 2 in a layered mode, and a carbon fiber protective sleeve 4 assembled with the plurality of layers of composite magnetic material layers 3 in an interference mode; wherein the content of the first and second substances,
the annular permanent magnet 2 comprises a plurality of tile-shaped sintered permanent magnets (for example, four tile-shaped sintered permanent magnets) adhered to the side surface of the rotating shaft 1 and magnetic powder glue films filled among the sintered permanent magnets; alternatively, the first and second electrodes may be,
the annular permanent magnet 2 is an annular bonded permanent magnet which is in interference fit with the rotating shaft 1.
In specific implementation, in the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, as shown in fig. 2, fig. 2 is a partial schematic view of fig. 1, and the outer surface level of the annular permanent magnet 2 is wound with a windingNA layer of composite magnetic material is laminated,Nis an integer greater than 1; as shown in fig. 2, each layer of composite magnetic material layer 5 comprises a carbon fiber layer 6 and a magnetic powder adhesive film 7 paved on the carbon fiber layer 6, in each layer of composite magnetic material layer 5 wound on the outer surface of the annular permanent magnet 2, the magnetic powder adhesive film 7 is inside, and the carbon fiber layer 6 is outside; in the first layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, namely the layer of composite magnetic material layer tightly attached to the annular permanent magnet, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 3.8-4: 1; wound on the outer surface of the ring-shaped permanent magnetNIn the layer composite magnetic material layer, namely the last layer of wound composite magnetic material layer, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 0.8-1: 1; second to third layers wound on the outer surface of the annular permanent magnetNIn the-1 layer of composite magnetic material layer, the thickness of the magnetic powder adhesive film is according to the formula
Figure 30280DEST_PATH_IMAGE003
Gradually decrease in the direction of the flow, wherein,d ex is shown in the second to the third layersN1 the reduced thickness of the magnetic powder glue film in each of the layers relative to the magnetic powder glue film in the previous layer, i.e. the magnetic powder glue film in the second layer of composite magnetic material layer is reduced in thickness compared to the magnetic powder glue film in the first layer of composite magnetic material layerd ex The thickness of the magnetic powder glue film in the third layer of composite magnetic material layer is reduced compared with that of the magnetic powder glue film in the second layer of composite magnetic material layerd ex …, firstN-1 magnetic powder adhesive film ratio in composite magnetic material layerN-reduction of thickness of magnetic powder glue film in 2 layers of composite magnetic materiald ex ；k s Representing the first layer of the compositeThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the magnetic material layer,k e is shown asNThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the layer composite magnetic material layer,d c is the thickness of the carbon fiber layer in each composite magnetic material layer.
According to the novel high-speed motor multilayer variable magnetic load composite rotor structure, the radial outward direction is realized according to the radial change of the centrifugal force of the motor rotor, the centrifugal force is increased, the thickness ratio of the magnetic powder adhesive film to the carbon fiber is changed, and the thickness ratio of the magnetic powder adhesive film to the carbon fiber is reduced along the radial outward direction, so that the content of the carbon fiber in unit volume is increased, the strength of a composite magnetic material layer is improved, the centrifugal force resistance is improved, and the strength problem of the motor rotor can be solved; in addition, for the existing rotor with the constant thickness ratio of the magnetic powder adhesive film to the carbon fibers, the carbon fibers need to be wound additionally in order to achieve the same strength as the rotor, so that compared with the existing rotor with the constant thickness ratio of the magnetic powder adhesive film to the carbon fibers, the rotor provided by the invention can effectively improve the content of the magnetic powder in unit volume, improve the residual magnetism of the composite magnetic material, and further effectively improve the electromagnetic performance of the motor rotor.
In specific implementation, in the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, the structure may further include: the single-layer carbon fiber layer is arranged between the annular permanent magnet and the multiple layers of composite magnetic material layers, and not only can the friction force when the composite magnetic material layers are wound be increased, but also the radial tensile stress of the annular permanent magnet can be reduced; and, may further include: the single-layer carbon fiber layer between the multilayer composite magnetic material layer and the carbon fiber protective sleeve can prevent the composite magnetic material layer from falling off due to interference assembly.
In specific implementation, in the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, the magnetic powder adhesive films on the surfaces of the two axial ends of the composite magnetic material layer are in direct contact with air, and are easily oxidized, and the magnetic powder adhesive films are easily lost under the action of centrifugal force under the condition of high rotating speed, so that the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention can further comprise: the epoxy resin coatings are positioned on the surfaces of the two axial ends of the composite magnetic material layer, and not only can the magnetic powder adhesive film be prevented from being oxidized, but also the loss of the magnetic powder adhesive film under the action of centrifugal force under the condition of high rotating speed can be avoided.
Based on the same inventive concept, the invention also provides a manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure, as shown in fig. 3, the manufacturing method comprises the following steps:
s1: mixing the magnetic powder with an epoxy resin binder, a coupling agent, a curing agent and a plasticizer, and stirring at a first preset temperature to obtain a magnetic powder adhesive film;
s2: cleaning the side surface of the rotating shaft;
s3: sticking four tile-shaped sintered permanent magnets on the side surface of the rotating shaft, filling magnetic powder glue films between the sintered permanent magnets, putting the sintered permanent magnets into a curing furnace, and performing rotary heating curing at a second preset temperature for a first preset time; or, the rotating shaft and the annular bonded permanent magnet are assembled in an interference fit manner;
s4: step-shaped alloy baffles are respectively arranged at two ends of the rotating shaft provided with the annular permanent magnet; the alloy baffle comprises a small step inside and a large step outside, the outer diameter of the small step is the same as that of the annular permanent magnet, and the outer diameter of the large step is larger than or equal to that of the finally formed rotor;
the reason why the alloy baffle is designed to be stepped is that after the composite magnetic material is wound, the surfaces of the two axial ends of the composite magnetic material layer need to be machined, so that allowance needs to be reserved at the two axial ends of the composite magnetic material layer; therefore, in the subsequent winding process of the composite magnetic material layer, the large steps of the alloy baffle can effectively prevent the magnetic powder adhesive film from axially moving and losing, improve the uniformity of the composite magnetic material in the circumferential direction and ensure the symmetry of a magnetic field in the circumferential direction; the small steps of the alloy baffle can reserve allowance for the two axial ends of the composite magnetic material layer, so that the composite magnetic material can be conveniently and mechanically processed in the later period, and the uniform magnetic distribution of the end surface of the rotor is ensured;
s5: the servo motor is used for driving the rotating shaft to rotate, the magnetic powder adhesive film is paved on the carbon fiber layer by the nozzle and then wound on the outer surface of the annular permanent magnet, the composite magnetic material layer is placed into a curing furnace after being wound, and the curing furnace is rotated, heated and cured at a third preset temperature for a second preset time; wherein, the circumferential linear speed of the rotation of the servo motor is constant;
s6: after the solidification is finished, the carbon fiber protective sleeve and the composite magnetic material layer are in interference fit;
s7: after the assembly is completed, the alloy baffle is disassembled after the rotation heating solidification is carried out at the fourth preset temperature for the third preset time, and finally, the mechanical processing is carried out to obtain the composite rotor structure.
The manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention adopts a segmented curing process mode, and can ensure the stability of the forming size of the composite rotor and the uniformity of circumferential magnetic powder.
In specific implementation, when the step S1 in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention is executed, the first preset temperature can be controlled within a range of 50 ℃ to 60 ℃.
In concrete implementation, after step S3 in the method for manufacturing a multilayer variable magnetic load composite rotor structure of a novel high-speed motor provided by the present invention is executed, before step S4 in the method for manufacturing a multilayer variable magnetic load composite rotor structure of a novel high-speed motor provided by the present invention is executed, the following operations may also be executed: the single-layer carbon fiber layer is wound on the outer surface of the annular permanent magnet, so that the friction force generated when the composite magnetic material layer is wound can be increased, and the radial tensile stress of the annular permanent magnet can be reduced; in addition, when step S5 of the method for manufacturing a multilayer variable magnetic load composite rotor structure of a novel high-speed motor according to the present invention is executed, the following operations may be further performed after the winding of the composite magnetic material layer is completed and before the composite magnetic material layer is placed in the curing oven: the single-layer carbon fiber layer is wound on the surface of the composite magnetic material layer, and the single-layer carbon fiber layer can prevent the composite magnetic material layer from falling off due to interference assembly.
In specific implementation, in the method for manufacturing the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention, in the step S5, the servo motor is used to drive the rotating shaft to rotate, and the nozzle is used to coat the magnetic powder adhesive film on the carbon fiber layer and then wind the carbon fiber layer on the outer surface of the annular permanent magnet, the method can be specifically realized in the following manner:
detecting the number of winding turns through a Hall element arranged on the bottom surface of the rotating shaft, and controlling the amount of the magnetic powder adhesive film sprayed out from the nozzle by using a linear control system according to the number of winding turns; wherein, in each layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the magnetic powder adhesive film is arranged inside, and the carbon fiber layer is arranged outside; in the first layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 3.8-4: 1; wound on the outer surface of the ring-shaped permanent magnetNIn the layer composite magnetic material layer, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 0.8-1: 1; second to third layers wound on the outer surface of the annular permanent magnetNIn the-1 layer of composite magnetic material layer, the thickness of the magnetic powder adhesive film is according to the formula
Figure 289223DEST_PATH_IMAGE001
Gradually decrease in the direction of the flow, wherein,d ex is shown in the second to the third layersN1 the reduced thickness of the magnetic powder glue film in each of the layers relative to the magnetic powder glue film in the previous layer,k s the thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the first layer is shown,k e is shown asNThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the layer,d c the thickness of the carbon fiber layer in each composite magnetic material layer; therefore, the Hall element is utilized, the linear control system is adopted, the preparation of the composite magnetic material layer with the thickness ratio of the carbon fiber to the magnetic powder adhesive film can be effectively finished, the thickness of the composite magnetic material wound for one circle is ensured to be consistent, and the thickness of each layer of the composite magnetic material wound is gradually reduced from inside to outside along the radial direction.
In specific implementation, as the number of winding layers of the composite magnetic material layer increases, the circumferential perimeter of the rotation of the servo motor becomes larger, and in order to ensure the uniformity of the composite magnetic material layer, the circumferential linear speed of the rotation of the servo motor needs to be ensured to be constant. Preferably, when the step S5 of the method for manufacturing a multi-layer variable magnetic load composite rotor structure of a novel high-speed motor provided by the invention is executed, the circumferential linear velocity of the rotation of the servo motor can be controlled within a range of 0.1m/S to 1 m/S.
In specific implementation, when step S5 in the method for manufacturing the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention is executed, after the winding of the composite magnetic material layer is finished, before the composite magnetic material layer is placed into a curing furnace, the hall element needs to be disassembled, so as to avoid damage to the hall element due to subsequent rotational heating and curing.
In specific implementation, when the step S3 in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention is executed, the second preset temperature can be controlled within a range of 120 ℃ to 130 ℃, and the first preset duration is controlled within a range of 1h to 2 h; when the step S5 in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure is executed, the third preset temperature can be controlled within the range of 120-130 ℃, and the second preset time is controlled within the range of 1-2 h; when the step S7 in the manufacturing method of the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the invention is executed, the fourth preset temperature can be controlled within a range of 120 ℃ to 130 ℃, and the third preset duration can be controlled within a range of 1h to 2 h.
In specific implementation, after step S7 in the method for manufacturing the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the present invention is performed, the magnetic powder glue films on the surfaces of the two axial ends of the composite magnetic material layer are in direct contact with air, and are not only easily oxidized, but also easily lost under the action of centrifugal force at a high rotation speed, and based on this, after step S7 in the method for manufacturing the novel high-speed motor multilayer variable magnetic load composite rotor structure provided by the present invention is performed, the following operations may also be performed:
s8: the surfaces of the two axial ends of the composite magnetic material layer are coated with the epoxy resin coatings, and the epoxy resin coatings can prevent the magnetic powder adhesive film from being oxidized and can also avoid the loss of the magnetic powder adhesive film under the action of centrifugal force under the condition of high rotating speed.
The following is a detailed description of a specific implementation of the method for manufacturing the multilayer variable magnetic load composite rotor structure of the novel high-speed motor according to the present invention by using a specific embodiment.
Example 1:
the first step is as follows: and preparing the magnetic powder adhesive film.
Mixing the magnetic powder with a series of additives including an epoxy resin binder, a coupling agent, a curing agent and a plasticizer, and stirring at the temperature of 55 ℃ to obtain the magnetic powder adhesive film.
The second step is that: cleaning the side surface of the rotating shaft.
The third step: four tile-shaped sintered permanent magnets are adhered to the side surface of the rotating shaft, magnetic powder adhesive films are filled between the sintered permanent magnets, and then the sintered permanent magnets are placed into a curing furnace to be subjected to rotary heating curing for 1 hour at the temperature of 120 ℃.
After the sintered permanent magnet and the magnetic powder adhesive film are solidified and combined, the sintered permanent magnet in the embodiment 1 of the invention can be similar to an annular assembly part, so that the deformation stress of the permanent magnet can be reduced, the air gap flux density of a high-speed motor can be improved, the damage to a carbon fiber protective sleeve caused by stress concentration due to interpolar gaps of the sintered permanent magnet can be avoided by integrating the sintered permanent magnet, the reliability of a high-speed motor rotor is improved, and the problem of stress concentration of the high-speed motor rotor is solved.
Of course, the annular permanent magnet can also be an annular bonded permanent magnet, the magnetic performance of the annular bonded permanent magnet is slightly inferior to that of a sintered permanent magnet, but the stress performance of the annular bonded permanent magnet is superior to that of the sintered permanent magnet due to the fact that the annular bonded permanent magnet is an integral piece, and the problem of stress concentration of a high-speed motor rotor can also be solved.
The fourth step: after the solidification is finished, a single-layer carbon fiber layer is wound on the outer surface of the annular permanent magnet, and the single-layer carbon fiber layer can not only increase the friction force when the composite magnetic material layer is wound, but also reduce the radial tensile stress of the annular permanent magnet.
The fifth step: step-shaped alloy baffles 8 are respectively arranged at two ends of the rotating shaft 1 provided with the annular permanent magnets 2, as shown in FIG. 4; wherein, the alloy baffle 8 comprises a small step inside and a large step outside, the outer diameter of the small step is the same as that of the annular permanent magnet 2, and the outer diameter of the large step is larger than or equal to that of the finally formed rotor, namely, the subsequent carbon fiber protective sleeve 4 and the rotorNOuter diameter of the layer composite magnetic material layer 3 after interference fit. Specifically, the axial length of the stepped alloy baffle may be 6mm, the axial length of the large step may be 2mm, and the axial length of the small step may be 4 mm.
In the subsequent winding process of the composite magnetic material layer, the large steps of the alloy baffle can effectively prevent the magnetic powder adhesive film from moving and losing along the axial direction, improve the uniformity of the composite magnetic material in the circumferential direction and ensure the symmetry of a magnetic field in the circumferential direction; the small steps of the alloy baffle can reserve allowance for the two axial ends of the composite magnetic material layer, so that the composite magnetic material can be conveniently mechanically processed in the later period, and the uniform magnetic distribution of the end face of the rotor is ensured.
And a sixth step: the rotating shaft is driven to rotate by a servo motor, as shown in fig. 5, a nozzle 9 is used for laying a magnetic powder adhesive film 7 on a carbon fiber layer 6 and then winding the carbon fiber layer on the side surface of the rotating shaft 1, meanwhile, the number of winding turns is detected by a Hall element 10 arranged on the bottom surface of the rotating shaft 1, and according to the number of winding turns, the amount of the magnetic powder adhesive film 7 sprayed out by the nozzle 9 is controlled by a linear control system; the thickness of the magnetic powder adhesive film in the first layer is 0.4mm, the thickness of the magnetic powder adhesive film in the composite magnetic material is reduced by 0.01mm every 1 winding, 31 layers are wound, the thickness of the magnetic powder adhesive film in the last layer is reduced by 0.3mm compared with that of the magnetic powder adhesive film in the initial layer, the speed of the circumferential line wound by the rotor is kept constant under the vector control of a servo motor in the winding process of the rotor, the winding speed is controlled to be 0.5m/s, pre-tightening force is added in the winding process, and the pre-tightening force shows the descending trend until the winding of the composite magnetic material is finished. After the winding of the composite magnetic material layer is finished, the Hall element is disassembled, the single-layer carbon fiber layer is wound on the surface of the composite magnetic material layer, the single-layer carbon fiber layer can prevent the composite magnetic material layer from falling off due to follow-up interference assembly, the composite magnetic material layer is placed into a curing furnace after the single-layer carbon fiber layer is wound on the surface of the composite magnetic material layer, and the rotary heating curing is carried out for 1 hour at the temperature of 120 ℃.
The thickness of the magnetic powder adhesive film is linearly controlled, so that the preparation of a composite magnetic material layer with the thickness transformation ratio of carbon fiber and magnetic powder adhesive film can be realized; the vector control of the servo motor ensures constant speed of the winding circumference line, and can improve the paving uniformity of the magnetic powder adhesive film.
In the embodiment, the carbon fiber prepreg with the width of 280mm and the thickness of 0.1mm is adopted, and on the basis of meeting the mechanical property of the high-speed permanent magnet motor, the mechanical property and the cost of the carbon fiber are comprehensively considered, so that the maximum content of the magnetic powder adhesive film in unit volume is ensured.
The seventh step: after the solidification is finished, single-layer carbon fiber prepreg is wound on the surface of the composite magnetic material layer, and then interference assembly between the carbon fiber protective sleeve and the composite magnetic material layer is carried out.
The single-layer carbon fiber prepreg is wound after the composite magnetic material is wound, so that the composite magnetic material layer can be prevented from falling off due to interference assembly, and the single-layer carbon fiber prepreg can play a certain protection role.
Eighth step: after the carbon fiber protective sleeve is subjected to interference assembly, the carbon fiber protective sleeve is cured for 2 hours at the temperature of 130 ℃, the alloy baffle is disassembled, machining is carried out, and then epoxy resin coatings are coated on the surfaces of the two axial ends of the composite magnetic material layer, so that the magnetic powder adhesive film can be prevented from being oxidized, and the loss of the magnetic powder adhesive film under the action of centrifugal force under the condition of high rotating speed can be avoided.
According to the novel high-speed motor multilayer variable magnetic load composite rotor structure and the manufacturing method thereof, the magnetic powder adhesive film is used for filling the interpoles of the sintered permanent magnet, and after the integral molding of the sintered permanent magnet is completed, the sintered permanent magnet can be equivalently formed into a ring, so that the deformation stress of the permanent magnet can be reduced, the air gap magnetic density of the high-speed motor can be improved, the damage to a carbon fiber protective sleeve caused by stress concentration due to interpole gaps of the sintered permanent magnet can be avoided, the reliability of the high-speed motor rotor can be improved, the problem of stress concentration of the high-speed motor rotor can be solved, and the key technical problem of the development of the high-speed motor to high power and high rotating speed can be solved. The annular bonded permanent magnet can also be an annular bonded permanent magnet, the magnetic performance of the annular bonded permanent magnet is slightly inferior to that of a sintered permanent magnet, but the stress performance of the annular bonded permanent magnet is superior to that of the sintered permanent magnet due to the fact that the annular bonded permanent magnet is an integral piece, and the problem of stress concentration of a high-speed motor rotor can also be solved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. The utility model provides a high-speed motor multilayer becomes magnetic load composite rotor structure which characterized in that includes: the device comprises a rotating shaft, an annular permanent magnet wrapped on the side surface of the rotating shaft, a plurality of layers of composite magnetic material layers wound on the outer surface of the annular permanent magnet in a layered mode, and a carbon fiber protective sleeve in interference fit with the plurality of layers of composite magnetic material layers; wherein the content of the first and second substances,
the annular permanent magnet comprises a plurality of tile-shaped sintered permanent magnets adhered to the side surface of the rotating shaft and magnetic powder adhesive films filled between the sintered permanent magnets; or the annular permanent magnet is an annular bonded permanent magnet which is in interference fit with the rotating shaft;
the outer surface of the annular permanent magnet is wound withNA layer composite magnetic material layer; each layer of composite magnetic material layer comprises 1 carbon fiber layer and 1 magnetic powder adhesive film paved on the carbon fiber layer, and in each layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the magnetic powder adhesive film is arranged inside, and the carbon fiber layer is arranged outside;
in the first layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 3.8-4: 1; a second winding wound on the outer surface of the annular permanent magnetNIn the layer composite magnetic material layer, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 0.8-1: 1;
outside the annular permanent magnet bodySecond to third layers of surface windingNIn 1 layer of composite magnetic material layer, the thickness of the magnetic powder adhesive film is according to the formula
Figure 772956DEST_PATH_IMAGE001
Gradually decrease in the direction of the flow, wherein,d ex is shown in the second to the third layersN1 the reduced thickness of the magnetic powder glue film in each of the layers relative to the magnetic powder glue film in the previous layer,k s the thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the first layer is shown,k e is shown asNThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the layer,d c is the thickness of the carbon fiber layer in each composite magnetic material layer.
2. The multi-layer variable magnetic load composite rotor structure of the high-speed motor according to claim 1, further comprising:
the single-layer carbon fiber layer is arranged between the annular permanent magnet and the multiple layers of composite magnetic material layers and is used for increasing the friction force when the composite magnetic material layers are wound and reducing the radial tensile stress of the annular permanent magnet;
the single-layer carbon fiber layer between the multilayer composite magnetic material layer and the carbon fiber protective sleeve is used for preventing the composite magnetic material layer from falling off due to interference assembly.
3. The multi-layer variable magnetic load composite rotor structure of the high-speed motor according to claim 1, further comprising: and the epoxy resin coatings are positioned on the surfaces of the two axial ends of the composite magnetic material layer and are used for preventing the magnetic powder adhesive film from being oxidized and being lost under the action of centrifugal force under the condition of high rotating speed.
4. A manufacturing method of a high-speed motor multilayer variable magnetic load composite rotor structure according to any one of claims 1 to 3 is characterized by comprising the following steps:
s1: mixing the magnetic powder with an epoxy resin binder, a coupling agent, a curing agent and a plasticizer, and stirring at a first preset temperature to obtain a magnetic powder adhesive film;
s2: cleaning the side surface of the rotating shaft;
s3: sticking four tile-shaped sintered permanent magnets on the side surface of the rotating shaft, filling magnetic powder glue films between the sintered permanent magnets, putting the sintered permanent magnets into a curing furnace, and performing rotary heating curing at a second preset temperature for a first preset time; or, the rotating shaft and the annular bonded permanent magnet are assembled in an interference fit manner;
s4: step-shaped alloy baffles are respectively arranged at two ends of the rotating shaft provided with the annular permanent magnet; the alloy baffle comprises a small step inside and a large step outside, the outer diameter of the small step is the same as that of the annular permanent magnet, and the outer diameter of the large step is larger than or equal to that of the finally formed rotor;
s5: the servo motor is used for driving the rotating shaft to rotate, the magnetic powder adhesive film is paved on the carbon fiber layer by the nozzle and then wound on the outer surface of the annular permanent magnet, the composite magnetic material layer is placed into a curing furnace after being wound, and the curing furnace is rotated, heated and cured at a third preset temperature for a second preset time; wherein, the circumferential linear speed of the rotation of the servo motor is constant;
s6: after the solidification is finished, the carbon fiber protective sleeve and the composite magnetic material layer are in interference fit;
s7: after the assembly is finished, carrying out rotary heating solidification at a fourth preset temperature for a third preset time, disassembling the alloy baffle, and finally carrying out machining to obtain a composite rotor structure;
at execution step S5, utilize servo motor to drive the pivot and rotate, utilize the nozzle to cover the in-process of winding on the surface of annular permanent magnet after on the carbon fiber layer with the magnetic powder glued membrane, specifically include:
detecting the number of winding turns through a Hall element arranged on the bottom surface of the rotating shaft, and controlling the amount of the magnetic powder adhesive film sprayed out from the nozzle by using a linear control system according to the number of winding turns; in each layer of composite magnetic material layer wound on the outer surface of the annular permanent magnet, the magnetic powder adhesive film is arranged inside, and the carbon fiber layer is arranged outside; in the first layer of composite magnetic material layer wound on the outer surface of the annular permanent magnetThe ratio of the thickness of the powder adhesive film to the thickness of the carbon fiber layer is 3.8-4: 1; a second winding wound on the outer surface of the annular permanent magnetNIn the layer composite magnetic material layer, the ratio of the thickness of the magnetic powder adhesive film to the thickness of the carbon fiber layer is 0.8-1: 1; second to fourth layers wound around the outer surface of the annular permanent magnetNIn 1 layer of composite magnetic material layer, the thickness of the magnetic powder adhesive film is according to the formula
Figure 21535DEST_PATH_IMAGE002
Gradually decrease in the direction of the flow, wherein,d ex is shown in the second to the third layersN1 the reduced thickness of the magnetic powder glue film in each of the layers relative to the magnetic powder glue film in the previous layer,k s the thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the first layer is shown,k e is shown asNThe thickness ratio of the magnetic powder adhesive film to the carbon fiber layer in the layer,d c the thickness of the carbon fiber layer in each composite magnetic material layer;
in step S5, after the winding of the composite magnetic material layer is completed and before the composite magnetic material layer is placed in the curing oven, the method further includes:
and (5) disassembling the Hall element.
5. The method for manufacturing the multilayer variable magnetic load composite rotor structure of the high-speed motor according to claim 4, wherein in the step S1, the first preset temperature is 50 ℃ to 60 ℃.
6. The method for manufacturing the multilayer variable magnetic load composite rotor structure of the high-speed motor according to claim 4, wherein after the step S3 is executed and before the step S4 is executed, the method further comprises:
winding a single-layer carbon fiber layer on the outer surface of the annular permanent magnet;
in step S5, after the winding of the composite magnetic material layer is completed and before the composite magnetic material layer is placed in the curing oven, the method further includes: and winding a single-layer carbon fiber layer on the surface of the composite magnetic material layer.
7. The manufacturing method of the multilayer variable magnetic load composite rotor structure of the high-speed motor according to claim 4, wherein in the step S3, the second preset temperature is 120-130 ℃, and the first preset time is 1-2 h;
in the step S5, the third preset temperature is 120-130 ℃, and the second preset time is 1-2 h;
in the step S7, the fourth preset temperature is 120-130 ℃, and the third preset time is 1-2 hours.
8. The method for manufacturing a multilayer variable magnetic load composite rotor structure of a high-speed motor according to claim 4, wherein after step S7 is executed, after the assembly is completed, the alloy baffle is disassembled after the solidification is performed at a fourth preset temperature for a third preset time, and finally the machining is performed to obtain the composite rotor structure, the method further comprises the following steps:
s8: and coating epoxy resin coatings on the surfaces of the two axial ends of the composite magnetic material layer.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111835161A (en) * 2020-09-16 2020-10-27 北京航空航天大学 Spiral winding preparation method for composite rotor of high-speed permanent magnet synchronous motor
CN112615449A (en) * 2020-09-16 2021-04-06 山东大学 Multilayer structure hybrid excitation rotor and manufacturing method thereof
CN112615450A (en) * 2020-09-16 2021-04-06 山东大学 Composite rotor suitable for high-speed permanent magnet motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111835161A (en) * 2020-09-16 2020-10-27 北京航空航天大学 Spiral winding preparation method for composite rotor of high-speed permanent magnet synchronous motor
CN112615449A (en) * 2020-09-16 2021-04-06 山东大学 Multilayer structure hybrid excitation rotor and manufacturing method thereof
CN112615450A (en) * 2020-09-16 2021-04-06 山东大学 Composite rotor suitable for high-speed permanent magnet motor

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