CN115085418B - Super-hybrid composite material rotor magnetic steel surface heat insulation structure and preparation method thereof - Google Patents
Super-hybrid composite material rotor magnetic steel surface heat insulation structure and preparation method thereof Download PDFInfo
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- CN115085418B CN115085418B CN202210806761.0A CN202210806761A CN115085418B CN 115085418 B CN115085418 B CN 115085418B CN 202210806761 A CN202210806761 A CN 202210806761A CN 115085418 B CN115085418 B CN 115085418B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
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- 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 general shape other than plane
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- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- 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
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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
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
- H02K11/012—Shields associated with rotating parts, e.g. rotor cores or rotary shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- 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
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- 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
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
- B32B2262/0269—Aromatic polyamide fibres
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- 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
- B32B2262/101—Glass fibres
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- 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
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- 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
- B32B2307/212—Electromagnetic interference shielding
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- 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
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/304—Insulating
Abstract
The invention discloses a super-hybrid composite material rotor magnetic steel surface heat insulation structure and a preparation method thereof, wherein the super-hybrid composite material rotor magnetic steel surface heat insulation structure comprises rotor magnetic steel and a thermoplastic composite material rotor sheath wrapped outside the rotor magnetic steel, and a heat insulation layer is arranged between the rotor magnetic steel and the thermoplastic composite material rotor sheath, and the super-hybrid composite material rotor magnetic steel surface heat insulation structure is characterized in that: the insulating layer is formed by compounding a heat conduction layer and a fiber reinforced thermoplastic composite material layer, the heat conduction layer is positioned on the inner side of the fiber reinforced thermoplastic composite material layer, the heat conduction coefficient of the heat conduction layer is higher than that of the fiber reinforced thermoplastic composite material layer, when the thermoplastic composite material rotor sheath is subjected to local heating forming, heat is diffused to the rotor magnetic steel along the fiber reinforced thermoplastic composite material layer and the heat conduction layer in sequence, and the heat conduction layer enables the heat to be diffused in the heat conduction layer by utilizing the self high heat conduction coefficient. The invention can realize heat insulation along the direction of the out-of-plane thickness, improve the heat insulation effect, effectively reduce the thickness of the heat insulation layer, and realize the preparation of the heat insulation layer with the self-pretightening effect by adopting a tension forming mode.
Description
Technical Field
The invention relates to a heat insulation material for motor rotor magnetic steel, belongs to the technical field of functional composite materials, and particularly relates to a super-hybrid composite material rotor magnetic steel surface heat insulation structure for heating by a mobile heat source and a preparation method thereof.
Background
The resin of the high-performance thermoplastic prepreg is in a complete consolidation state, the forming process only generates physical change, the winding of high tension at the level of 1000MPa can be realized, the in-situ consolidation forming of a mobile heat source can be realized by utilizing high-density heat sources such as laser, the pre-tightening effect of the high tension forming is improved, and the high-performance thermoplastic prepreg is suitable for the forming requirement of a high-speed permanent magnet motor rotor sheath.
However, the high-performance thermoplastic prepreg has the characteristics of high-temperature molding and medium-low temperature use, the molding temperature of the high-performance thermoplastic prepreg is generally higher than the melting point of resin, but the use temperature of the high-performance thermoplastic prepreg is generally only higher than the glass transition temperature of the resin, and taking a carbon fiber/PEEK material as an example, the molding temperature of the high-performance thermoplastic prepreg is 380-420 ℃, but the maximum temperature of the high-performance thermoplastic prepreg allowed to be used for a long time is only 260 ℃. The magnetic steel material can generate irreversible demagnetization after exceeding the Curie temperature, in the commonly used magnetic steel material, the Curie temperature of rubidium, iron and boron magnetic steel is about 180 ℃, and the samarium-cobalt magnetic steel is 230 ℃, generally, in order to ensure that the magnetic steel does not generate demagnetization, the highest temperature of the magnetic steel is required to be controlled below the Curie temperature. The high-performance thermoplastic prepreg can meet the pre-tightening requirement of the motor rotor, but the forming temperature of the high-performance thermoplastic prepreg is far higher than the Curie temperature of the magnetic steel of the motor rotor, so that the magnetic steel is easy to lose magnetism. Therefore, a heat insulation layer is required to be arranged between the rotor sheath of the high-performance thermoplastic composite material and the magnetic steel. For example, when the rotor sheath is made of carbon fiber/PEEK material and the magnetic steel material is rubidium, iron and boron, the outer wall of the thermal insulation layer contacting the rotor sheath needs to be heated to 420 ℃, and the maximum temperature of the inner wall of the thermal insulation layer contacting the magnetic steel is reduced to 150 ℃ through thermal insulation.
Most of the existing heat insulation materials are low-heat-conduction and porous materials, the volume or the thickness is easy to be larger while the heat insulation effect is realized, and the strength of the common heat insulation materials is lower. The magnetic field intensity of the motor rotor is sharply reduced along with the increase of the distance, and a heat insulation layer needs to be as thin as possible so as to reduce the magnetic field intensity loss and improve the electromagnetic efficiency of the rotor; the rotor rotates at a high speed to generate a great centrifugal load, and the centrifugal load of the outer edge of the rotor with a larger diameter is larger; because rotor centrifugal load effect needs the insulating layer to have certain from pretension effect, offsets centrifugal load, prevents that the rotor rotation from resulting in layering and destruction.
The heating of a moving heat source during the molding of the high-performance thermoplastic composite material has the transient characteristic, and the rotor magnetic steel heat insulation only has the radial heat insulation requirement along the thickness direction of the heat insulation layer, and has the unidirectional characteristic. The existing heat insulation material has large thickness and low strength, cannot fully utilize the instantaneity in the forming process of a movable heat source and the unidirectionality of the heat insulation requirement of the rotor magnetic steel surface, and cannot meet the requirements of thickness reduction and self-pre-tightening required by a rotor heat insulation layer. In order to meet the heat insulation requirement of the rotor magnetic steel surface in the heating process of a moving heat source, a novel heat insulation layer material is urgently needed to be developed.
Disclosure of Invention
The invention provides a heat insulation layer material structure for heating rotor magnetic steel of a metal/fiber reinforced thermoplastic super-hybrid composite material by a moving heat source and a preparation method thereof.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a super mix combined material rotor magnet steel surface heat-proof structure, includes rotor magnet steel and the thermoplasticity combined material rotor sheath of parcel in the rotor magnet steel outside, sets up insulating layer, characterized by between rotor magnet steel and the thermoplasticity combined material rotor sheath: the insulating layer is formed by compounding a heat conduction layer and a fiber reinforced thermoplastic composite material layer, the heat conduction layer is positioned on the inner side of the fiber reinforced thermoplastic composite material layer, the heat conduction coefficient of the heat conduction layer is higher than that of the fiber reinforced thermoplastic composite material layer, when the thermoplastic composite material rotor sheath is subjected to local heating forming, heat is diffused to the rotor magnetic steel along the fiber reinforced thermoplastic composite material layer and the heat conduction layer in sequence, the heat conduction layer utilizes the self high heat conduction coefficient to diffuse the heat in the heat conduction layer, and then the heat conduction area between the insulating layer and the rotor magnetic steel is enlarged.
In some of these embodiments, the thermally conductive layer and the fiber-reinforced thermoplastic composite layer are each formed by winding under tension a narrow strip having a width in the range of 5-20 mm.
In some of these embodiments, the thermally conductive layer is a metal layer.
In some of these embodiments, the thermally conductive layer is made of copper or aluminum or stainless steel.
In some of these embodiments, the thermally conductive layer is 0.1-2mm thick.
In some of these embodiments, the fiber reinforced thermoplastic composite layer is comprised of a plurality of individual layers of fiber reinforced thermoplastic composite, the individual layers of fiber reinforced thermoplastic composite having a thickness of 0.1 to 1mm.
In some of these embodiments, the fiber reinforced thermoplastic composite layer is a glass fiber reinforced thermoplastic composite layer or a carbon fiber reinforced thermoplastic composite layer or an aramid fiber reinforced thermoplastic composite layer.
A method for manufacturing a super-hybrid composite material rotor magnetic steel surface heat insulation structure comprises the following steps:
step one, comprehensively considering the heating condition of a moving heat source for locally heating a thermoplastic composite material rotor sheath, the Curie temperature limit condition of rotor magnetic steel and the selection coefficient beta of a fiber reinforced thermoplastic composite material layer, and calculating and determining the thickness and the layering sequence of various materials of the required fiber reinforced thermoplastic composite material layer by adopting finite element calculation software; the calculation of the selection coefficient β is: β = k1/k3 ρ Cp, wherein k1 is the in-plane thermal conductivity of the fiber reinforced thermoplastic composite layer, k3 is the out-of-plane thermal conductivity of the fiber reinforced thermoplastic composite layer, ρ is the density of the fiber reinforced thermoplastic composite layer, and Cp is the heat capacity of the fiber reinforced thermoplastic composite layer, and the larger β is the more advantageous the fiber reinforced thermoplastic composite layer is for insulating a moving heat source;
step two, because the metal material can produce the eddy current loss in the electromagnetic field of the electric motor rotor, cause the electromagnetic efficiency to reduce, but the thin metal material within 5mm can reduce the eddy current loss produced by rotor magnet steel, form the shielding function, therefore, calculate the total eddy current loss of the electric motor rotor according to material attribute and electromagnetic field condition that the heat conduction layer uses, utilize the electromagnetic loss and shielding effect of the heat insulation material layer of software calculation of finite element analysis, confirm the thickness of heat conduction layer;
and thirdly, pre-tightening the heat-insulating layer, wherein the heat-conducting layer and the fiber reinforced thermoplastic composite material layer are formed by winding narrow strips by tension, the narrow strips are heated and solidified by a heat source for forming the heat-insulating layer during winding, and the molding temperature has small influence on the strength during tension winding of the heat-conducting layer, so that the room-temperature yield strength sigma of the metal material is only considered b Therefore, the maximum allowable winding tension of the metal material is determined, and when the fiber reinforced thermoplastic composite material layer is wound under tension, the strength of the material is reduced due to heating due to the adoption of the heating forming, so that the maximum allowable winding tension of the fiber reinforced thermoplastic composite material is determined by considering the strength sigma c of the material at the forming temperature.
The surface of the heat conducting layer material is treated by shot blasting or plasma or acid-base etching, and a thermoplastic resin layer with the thickness of 0.01-0.1mm is added between the heat conducting layer and the fiber reinforced thermoplastic composite material layer.
The movable heat source is a laser local heat source, a focused infrared heat source, an ultrasonic point heat source, an induction heating heat source or a hot air and hot air torch heat source.
The invention has the beneficial effects that:
1. aiming at the instantaneous heating characteristic of a moving heat source and the unidirectional heat insulation requirement of a motor rotor, a metal/fiber reinforced thermoplastic super-hybrid composite material is designed, the high heat conduction characteristic of a metal layer is utilized to conduct heat and dissipate heat in the plane, the thinning of a heat insulation layer is realized, the utilization efficiency of a rotor magnetic field is improved, the size of the outer edge of the rotor is reduced, the centrifugal load of the outer edge of the rotor is reduced, and the structural bearing characteristic is optimized.
2. By adopting the forming mode of winding by layer tension, the self-pretightening requirement on the structure when the rotor rotates at high speed is met while the heat insulation effect is achieved, and the structure is effectively prevented from being separated and damaged under the action of centrifugal load.
3. The design mode comprehensively considering the functions of heat insulation of the movable heat source, structure self-pretightening and electromagnetic shielding is provided, and the integration of the multifunctionality and the structural function of the heat insulation layer is realized.
Drawings
FIG. 1 is a schematic diagram of the distribution of the material of the thermal insulation layer;
FIG. 2 is a schematic diagram of thermal insulation effect, wherein (a) is a schematic diagram of thermal insulation effect of the material of the present invention, and (b) is a schematic diagram of thermal insulation effect of a conventional material, wherein the region S1 is a high temperature heat affected zone of the material of the present invention, and the region S2 is a high temperature heat affected zone of the conventional material;
FIG. 3 is a schematic view of a rotor structure;
fig. 4 is a schematic structural diagram of 3 heat insulating layers for an earlier stage experiment, wherein (a) is a metal layer and 2 fiber reinforced composite material heat insulating layers adopted in the invention, and (b) is 3 fiber reinforced composite material heat insulating layers.
The label names in the figure: 1. the heat insulation layer 11, the heat conduction layer 12, the fiber reinforced thermoplastic composite material layer 2, the motor rotor 3, the rotor magnetic steel 4, the moving heat source 5 and the rotor sheath 5.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
It should be noted that the terms "upper", "lower", "left", "right", "front", "back", etc. used in the present invention are for clarity of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not limited by the technical contents of the essential changes.
As shown in fig. 1, the super-hybrid composite rotor magnetic steel surface heat insulation structure of the present invention comprises a heat insulation layer 1, wherein the heat insulation layer 1 is composed of a heat conduction layer 11 and a fiber reinforced thermoplastic composite material layer 12, the heat insulation layer forms a heat source, a motor rotor 2, rotor magnetic steel 3, a mobile heat source 4 and a rotor sheath 5, the thickness of the heat conduction layer 11 is 0.1-2mm, the fiber reinforced thermoplastic composite material layer 12 is composed of a plurality of single-layer fiber reinforced thermoplastic composite materials, and the single-layer thickness is 0.1-1mm;
because the thermal insulation layer 1 only needs to insulate along the thickness direction and needs to be as thin as possible, the anisotropic thermal conductivity characteristics of the material and the heat capacity of the material are comprehensively considered, a selection coefficient beta of the mobile heat source thermal insulation material is defined, whether the material is suitable for the thermal insulation requirement of the magnetic steel for heating the mobile heat source is judged by utilizing the beta, and the value beta = k1/k3 ρ Cp, wherein k1 is the in-plane thermal conductivity coefficient of the fiber reinforced thermoplastic composite material layer 12, k3 is the out-plane thermal conductivity coefficient of the fiber reinforced thermoplastic composite material layer 12, ρ is the material density of the fiber reinforced thermoplastic composite material layer 12, and Cp is the material of the fiber reinforced thermoplastic composite material layer 12, the larger beta is considered to be more beneficial to the thermal insulation of the fiber reinforced thermoplastic composite material layer 12 to the mobile heat source, the heating condition of the mobile heat source 4 and the Curie temperature limit condition of the rotor magnetic steel 3 are comprehensively considered, and finite element calculation software is adopted to calculate the thickness and the layering sequence of various materials of the fiber reinforced thermoplastic composite material layer 12;
because the metal material can generate eddy current loss in the electromagnetic field of the motor rotor 2, the electromagnetic efficiency is reduced, but the eddy current loss generated by the rotor magnetic steel 3 can be reduced by the thin-layer metal material within 5mm, a certain shielding effect is formed, the total eddy current loss of the motor rotor 2 is required to be calculated according to the material property and the electromagnetic field condition, the electromagnetic loss and the shielding effect of the heat insulation material layer are calculated by utilizing finite element analysis software, and the thickness of the heat conduction layer 11 is reasonably designed;
because the rotating speed of the motor rotor 2 is extremely high in the operation process, the centrifugal load is large, the heat-insulating layer 1 is required to have a certain pre-tightening effect to ensure that the heat-insulating layer 1 is not damaged and layered by the centrifugal load in the operation process of the motor rotor 2, in order to ensure that the heat-insulating layer 1 has a certain pre-tightening effect, the heat-conducting layer 11 and the fiber reinforced thermoplastic composite material layer 12 are both formed by narrow strips with the width within the range of 5-20mm through tension winding, the heat-insulating layer is formed by a heat source for heating and consolidation during winding, and the influence of the forming temperature on the strength of the heat-conducting layer 11 is small during tension winding, and only the normal-temperature yield strength Be of the metal material is considered b Thus, the maximum allowable winding tension of the metal material is determined, and when the fiber-reinforced thermoplastic composite material layer 12 is wound under tension, the strength of the material is reduced by heating due to the heat molding, and the strength sigma of the material at the molding temperature needs to be considered c Thereby determining the maximum allowable winding tension of the fiber reinforced thermoplastic composite material.
The heat conducting layer 11 may be made of a heat conducting metal material such as copper, aluminum, stainless steel, etc., and the material and thickness thereof are determined according to the design method according to the specific requirements of heat insulation, shielding and pre-tightening of the motor rotor 2. The fiber reinforced thermoplastic composite material layer 12 may be a glass fiber reinforced thermoplastic composite material, a carbon fiber reinforced thermoplastic composite material, or an aramid fiber reinforced thermoplastic composite material, and the material and thickness thereof are determined according to the specific heat insulation, shielding, and pre-tightening requirements of the motor rotor 2 by the design method. In order to improve the interface bonding strength between the heat conduction layer 11 and the fiber reinforced thermoplastic composite material layer 12, the surface of the material of the heat conduction layer 11 may be treated by shot blasting, plasma, and acid-base etching, and a thermoplastic resin layer of 0.01-0.1mm may be added between the heat conduction layer 11 and the fiber reinforced thermoplastic composite material layer 12. Since the heat insulating layer 1 is formed by laminating and mixing two materials, the interlayer heat resistance effect between the materials needs to be considered. The movable heat source 4 can be a laser local heat source, a focused infrared heat source, an ultrasonic point heat source, an induction heating heat source with small size, a hot air and hot air torch heat source with small air outlet, and can spray absorption particles such as carbon black on the surface of a material aiming at the insufficient absorption effect of part of the material on laser or infrared.
The diameter of the round spot laser moving heat source 4 is set to be 6mm, and the temperature is set to be 420 ℃. In the experiment, the same variable is adopted, the thicknesses of a single-layer fiber reinforced thermoplastic composite material and a metal material are both 0.15mm, the heat insulation effects of 3 layers of materials are respectively tested, the material 1 is a 3-layer carbon fiber reinforced thermoplastic composite material, the material 2 is a 3-layer glass fiber reinforced thermoplastic composite material, the material 3 is a glass fiber reinforced thermoplastic composite material/copper/glass fiber reinforced thermoplastic composite material disclosed by the invention, the heat insulation effects of the three materials are shown in the table, and the highest temperature of the inner wall of the heat insulation layer is recorded:
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| Highest temperature/deg.C of inner wall of heat insulation layer | 192.83 | 103.13 | 81.75 |
It can be seen that under the condition of the same thickness, the heat insulation effect of the heat insulation layer 1 disclosed by the invention is obviously improved, as shown in fig. 2, the heat affected zone of the heat insulation layer 1 disclosed by the invention is large, and under the same heating condition of the moving heat source 4, the in-plane heat dissipation effect is obvious, so that the heat insulation effect of the heat insulation layer 1 in the out-of-plane direction is greatly improved, and the highest temperature of the inner wall of the heat insulation layer 1 is reduced.
When the temperature of 100 ℃ is taken as a heat insulation target, the heat insulation layer 1 consisting of the 0.3mm glass fiber reinforced thermoplastic composite material layer 12 and the 0.15mm copper heat conduction layer 11 is known to have the heat insulation effect equivalent to that of the 0.6mm conventional pure glass fiber reinforced thermoplastic composite material layer 12, and the heat insulation layer 1 is thinned by 25% under the condition of the moving heat source.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention may be apparent to those skilled in the relevant art and are intended to be within the scope of the present invention.
Claims (9)
1. The utility model provides a super hybrid composite rotor magnet steel surface heat insulation structure's manufacturing method, uses super hybrid composite rotor magnet steel surface heat insulation structure, super hybrid composite rotor magnet steel surface heat insulation structure includes rotor magnet steel (3) and parcel thermoplasticity composite rotor sheath (5) in the rotor magnet steel (3) outside, rotor magnet steel (3) and thermoplasticity composite rotor sheath (5) between set up insulating layer (1), characterized by: the heat insulation layer (1) is formed by compounding a heat conduction layer (11) and a fiber reinforced thermoplastic composite material layer (12), the heat conduction layer (11) is located on the inner side of the fiber reinforced thermoplastic composite material layer (12), the heat conduction coefficient of the heat conduction layer (11) is higher than that of the fiber reinforced thermoplastic composite material layer (12), when the thermoplastic composite material rotor sheath (5) is locally heated and formed, heat is diffused to the rotor magnetic steel (3) along the fiber reinforced thermoplastic composite material layer (12) and the heat conduction layer (11) in sequence, the heat conduction layer (11) enables the heat to be diffused in the heat conduction layer (11) by utilizing the high heat conduction coefficient of the heat conduction layer (11), and further the heat conduction area between the heat insulation layer (1) and the rotor magnetic steel (3) is enlarged; the specific manufacturing method of the super-hybrid composite material rotor magnetic steel surface heat insulation structure comprises the following steps:
step one, comprehensively considering the heating condition of a movable heat source (4) for locally heating a thermoplastic composite material rotor sheath (5), the Curie temperature limit condition of rotor magnetic steel (3) and the selection coefficient beta of a fiber reinforced thermoplastic composite material layer (12), and calculating and determining the thickness and the layering sequence of various materials of the required fiber reinforced thermoplastic composite material layer (12) by adopting finite element calculation software; the calculation of the selection coefficient β is: β = k1/k3 ρ Cp, where k1 is the material in-plane thermal conductivity of the fiber-reinforced thermoplastic composite layer (12), k3 is the material out-of-plane thermal conductivity of the fiber-reinforced thermoplastic composite layer (12), ρ is the material density of the fiber-reinforced thermoplastic composite layer (12), and Cp is the material heat capacity of the fiber-reinforced thermoplastic composite layer (12), and a larger β is more advantageous for insulating the fiber-reinforced thermoplastic composite layer (12) from the moving heat source (4);
secondly, eddy current loss is generated in the electromagnetic field of the motor rotor (2) by the metal material, so that the electromagnetic efficiency is reduced, but the eddy current loss generated by the rotor magnetic steel (3) can be reduced by the thin-layer metal material within 5mm, so that a shielding effect is formed, therefore, the total eddy current loss of the motor rotor (2) is calculated according to the material property and the electromagnetic field condition of the heat conduction layer (11), the electromagnetic loss and the shielding effect of the heat insulation material layer are calculated by using finite element analysis software, and the thickness of the heat conduction layer (11) is determined;
thirdly, pre-tightening the heat-insulating layer (1), winding and forming the heat-conducting layer (11) and the fiber reinforced thermoplastic composite material layer (12) by using a narrow strip through tension, heating and solidifying the heat-insulating layer by using a heat source for forming the heat-insulating layer during winding, and only considering the normal-temperature yield strength Be of the metal material because the forming temperature has little influence on the strength of the heat-conducting layer (11) during tension winding b Therefore, the maximum allowable winding tension of the metal material is determined, and when the fiber reinforced thermoplastic composite material layer (12) is wound under tension, the strength of the material is reduced due to heating forming, so that the maximum allowable winding tension of the fiber reinforced thermoplastic composite material is determined by considering the strength Be c of the material at the forming temperature.
2. The method for manufacturing a super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 1, wherein the method comprises the following steps: the heat conduction layer (11) and the fiber reinforced thermoplastic composite material layer (12) are formed by winding narrow strips with the width within the range of 5-20mm by tension.
3. The method for manufacturing the super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 1, wherein the method comprises the following steps: the heat conduction layer (11) is a metal layer.
4. The method for manufacturing the super-hybrid composite rotor magnetic steel surface heat insulation structure as claimed in claim 3, wherein the method comprises the following steps: the heat conducting layer (11) is made of copper or aluminum or stainless steel.
5. The method for manufacturing a super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 1, wherein the method comprises the following steps: the thickness of the heat conduction layer (11) is 0.1-2mm.
6. The method for manufacturing a super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 1, wherein the method comprises the following steps: the fiber reinforced thermoplastic composite material layer (12) is composed of a plurality of single-layer fiber reinforced thermoplastic composite materials, and the thickness of the single-layer fiber reinforced thermoplastic composite materials is 0.1-1mm.
7. The method for manufacturing the super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 1, wherein the method comprises the following steps: the fiber reinforced thermoplastic composite material layer (12) is a glass fiber reinforced thermoplastic composite material layer or a carbon fiber reinforced thermoplastic composite material layer or an aramid fiber reinforced thermoplastic composite material layer.
8. The method for manufacturing a super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 1, wherein the method comprises the following steps: the surface of the material of the heat conduction layer (11) is subjected to shot blasting or plasma or acid-base etching treatment, and a thermoplastic resin layer with the thickness of 0.01-0.1mm is added between the heat conduction layer (11) and the fiber reinforced thermoplastic composite material layer (12).
9. The method for manufacturing the super-hybrid composite rotor magnetic steel surface heat insulation structure according to claim 8, wherein the method comprises the following steps: the movable heat source (4) is a laser local heat source, a focused infrared heat source, an ultrasonic point heat source, an induction heating heat source or a hot air and hot air torch heat source.
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| WO2015043814A2 (en) * | 2013-09-30 | 2015-04-02 | Siemens Aktiengesellschaft | Thermally conductive, fibre-reinforced plastic for electric motor housings, and method for the production and use thereof |
| CN107579614A (en) * | 2017-09-26 | 2018-01-12 | 南京磁之汇电机有限公司 | Rotor and high-speed permanent magnet motor |
| CN207782529U (en) * | 2018-01-25 | 2018-08-28 | 博远机电（嘉兴）有限公司 | Permanent magnet machine rotor complex protection covers and motor |
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| GB2582345B (en) * | 2019-03-20 | 2023-06-28 | Safran Electrical & Power | Improved method for manufacturing a rotor |
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| WO2015043814A2 (en) * | 2013-09-30 | 2015-04-02 | Siemens Aktiengesellschaft | Thermally conductive, fibre-reinforced plastic for electric motor housings, and method for the production and use thereof |
| CN107579614A (en) * | 2017-09-26 | 2018-01-12 | 南京磁之汇电机有限公司 | Rotor and high-speed permanent magnet motor |
| CN207782529U (en) * | 2018-01-25 | 2018-08-28 | 博远机电（嘉兴）有限公司 | Permanent magnet machine rotor complex protection covers and motor |
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