CN108418325B - Novel high-speed motor with integral permanent magnet rotor structure - Google Patents
Novel high-speed motor with integral permanent magnet rotor structure Download PDFInfo
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- CN108418325B CN108418325B CN201810196143.2A CN201810196143A CN108418325B CN 108418325 B CN108418325 B CN 108418325B CN 201810196143 A CN201810196143 A CN 201810196143A CN 108418325 B CN108418325 B CN 108418325B
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- 239000000463 material Substances 0.000 claims abstract description 65
- 239000006247 magnetic powder Substances 0.000 claims abstract description 21
- 238000004804 winding Methods 0.000 claims description 60
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 41
- 239000004917 carbon fiber Substances 0.000 claims description 41
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 239000003365 glass fiber Substances 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 17
- 239000000696 magnetic material Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000000112 cooling gas Substances 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 5
- 238000013021 overheating Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 66
- 230000005284 excitation Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
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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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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model provides a novel high-speed motor of whole permanent magnet rotor structure which characterized in that: the motor comprises a shell (1), a stator and a rotor of a mixed permanent magnet material layered binding structure, wherein the stator and the rotor are arranged in the shell (1), and the conductive permanent magnet material magnetic powder added in an outer unit layer of the novel integral permanent magnet rotor can shield high-frequency electromagnetic waves, so that the high-frequency eddy current loss of the mixed permanent magnet material magnetic powder in an inner unit layer is reduced. The structure can effectively reduce the heat source in the motor rotor, and radically solves the problem of overheating of the high-speed motor rotor. Meanwhile, the structure ensures the uniformity, the integrity and the consistency of the motor rotor, and can mechanically solve the problem that the permanent magnet is broken due to larger tensile stress under the condition of high-speed rotation.
Description
Technical Field
The invention relates to a novel high-speed motor with an integral permanent magnet rotor structure. Belongs to the field of motors.
Background
The high-speed motor has high rotating speed, high power density and small volume, so that materials can be effectively saved; the dynamic response is faster because of the smaller moment of inertia; the high speed motor can be directly connected with the working machine or the load, and a traditional mechanical load speed change device is omitted, so that noise can be reduced, and the efficiency of a transmission system can be improved. The research and application of the high-speed motor meet the economic development requirements of energy conservation and emission reduction, become one of research hot spots in the field of international electrotechnics at present, and have wide application prospects in high-speed grinding machines, air circulation refrigeration systems, energy storage flywheels, high-speed centrifugal compressors, blowers, aerospace and the like.
The permanent magnet motor has the advantages of simple structure, high force energy density, no excitation loss, high efficiency and the like, and is most suitable for a high-speed motor. Compared with a common motor, the high-speed high-frequency motor has larger design difficulty, the rotating speed of the high-speed motor is as high as tens of thousands of revolutions per minute or even hundreds of thousands of revolutions per minute, the circumferential speed can be more than 200m/s, the stator core loss is very large under the condition of high-speed rotation of the motor, the friction between the air and the surface of the rotor can bring great loss to the motor, meanwhile, for the high-speed permanent magnet motor, the eddy current loss of the rotor permanent magnet is very large, however, the heat dissipation of the rotor of the motor is difficult, the temperature rise of the motor rotor is too high, the permanent magnet can be irreversibly demagnetized under the condition of too high temperature, and serious harm is caused to the motor, so the loss of the motor rotor is reduced to become one of the core problems of the design of the high-speed permanent magnet motor. For high-speed permanent magnet motors, the problem of rotor strength is more pronounced, because the permanent magnets cannot withstand the tensile stresses generated by high-speed rotation and must be protected.
Disclosure of Invention
The invention aims to: the invention provides a novel high-speed motor with an integral permanent magnet rotor structure, and aims to solve the problems that the permanent magnet is irreversibly demagnetized due to high eddy current loss and difficult heat dissipation of a rotor of the traditional high-speed permanent magnet motor, and the reliability and the service life of the motor are seriously affected by damage caused by insufficient strength of the permanent magnet under the condition of high-speed rotation.
The technical scheme is as follows: the invention adopts the following technical scheme:
the utility model provides a novel high-speed motor of whole permanent magnet rotor structure which characterized in that: the motor comprises a shell, a stator and a rotor of a mixed permanent magnet material layered binding structure, wherein the stator and the rotor are both arranged in the shell, the stator comprises a stator core and a stator winding, the stator winding is arranged in the stator core, the rotor axially penetrates through the stator, an axial inner air channel for cooling gas to pass through is reserved between the rotor and the stator, an air channel inlet and an air channel outlet are respectively arranged on shells at two ends of the stator, and the air channel inlet is communicated with the air channel outlet through the axial inner air channel. So that the rotor cooling gas passes through the axial inner air duct from the air duct inlet and finally exits from the outlet air duct, and the cooling of the rotor is completed.
The stator core is provided with a hole which penetrates through the hole rotor in the axial direction, the stator winding is arranged at the hole wall of the stator core, and an axial inner air channel is formed between the stator winding and the rotor penetrating through the hole.
Winding pressing plates are further arranged at two ends of the stator. The winding pressing plate is made of insulating heat-conducting materials, and has the main effects of fixing the end parts at the two ends of the winding, and meanwhile, the pressing plate can effectively exchange heat between the winding end parts and the stator, so that the temperature rise of the winding end parts is reduced.
The rotor comprises a rotor core, a novel mixed permanent magnet material and a carbon fiber or glass fiber layer; the novel mixed permanent magnet material and the carbon fiber or glass fiber layer are alternately arranged by adopting a layered binding structure, the carbon fiber or glass fiber layer is arranged outside the rotor core, the novel mixed permanent magnet material is arranged outside the carbon fiber or glass fiber layer, the carbon fiber or glass fiber layer is continuously arranged outside the novel mixed permanent magnet material, and the like are alternately arranged, and then the carbon fiber is arranged outside the outermost layer. The novel mixed permanent magnet structure is formed by alternately binding novel mixed permanent magnet materials and carbon fibers, wherein no matter how many layers are, the novel mixed permanent magnet materials are arranged, and then a layer of carbon fibers is added on the outermost layer.
The novel mixed permanent magnetic material is formed by mixing permanent magnetic material magnetic powder and resin. The mixing method of the materials is that the excitation required by the operation of the motor is calculated by accurate finite elements, and then the magnetic powder of the permanent magnet material is mixed with the resin 1:1, because if the proportion is too large, the integrity of the novel permanent magnet material after mixing is greatly affected, the strength problem is difficult to ensure, if the proportion is too small, excitation is difficult to achieve, the overall thickness is increased, and the strength problem is also revealed.
The novel rotor with the integral permanent magnet structure is characterized in that unit layers are uniformly increased from inside to outside along the radial direction, and a plurality of pole numbers are formed by integral magnetization. In this structure, the uniform increase is the increase in the number of thicknesses such as the number of the unit layers included.
End covers are arranged at two ends of the shell.
The stator core is characterized in that a stator groove for fixing a winding is formed in the inner wall of a hole of the stator core, the stator groove is a pear-shaped groove, the winding is arranged in the pear-shaped groove, an upper layer and a lower layer of winding components are connected through short-distance lap windings, and the winding is wound in parallel by adopting a plurality of thin wires.
( The windings are generally divided into a single-layer winding and a double-layer winding, wherein the double-layer winding is adopted, so that the windings are divided into an upper layer and a lower layer, and the short-pitch winding comprises a short-pitch lap winding and a short-pitch wave winding; the multiple parallel windings replace the original thick wires with multiple thin wires, thereby reducing the skin effect. )
The plurality of parallel windings of the thin wires are in a form of short-distance Y connection. (connection mode of short-pitch star connection using multiple parallel windings.)
The novel integrated permanent magnet structure rotor is mainly characterized by adopting a layered uniform binding structure of novel mixed permanent magnet materials, wherein the novel mixed permanent magnet materials are prepared by mixing permanent magnet material magnetic powder with resin, each unit layer is composed of inner-layer carbon fibers (or glass filaments) and outer-layer novel mixed permanent magnet materials, the inner-layer carbon fibers (or glass filaments) are used for fixing, and the outer-layer novel mixed permanent magnet materials are used for providing excitation. The novel hybrid permanent magnet material and carbon fiber (or glass fiber) are alternately arranged, after a plurality of unit layers are bound, a layer of carbon fiber is bound on the outermost layer of the novel hybrid permanent magnet material to ensure the integral strength of the motor rotor, and then the novel hybrid permanent magnet structure high-speed permanent magnet motor rotor is formed. The unit layers are uniformly increased from inside to outside along the radial direction of the rotor, and the whole body is magnetized to form a plurality of pole numbers.
The carbon fiber and the resin in the novel rotor with the integral permanent magnetic structure are all electric insulation materials, and the magnetic powder of the permanent magnetic material with larger conductivity is uniformly mixed with the resin and uniformly layered and bound with the carbon fiber to form the novel rotor with the novel mixed permanent magnetic structure, so that the eddy current loss generated by the permanent magnetic material in the rotor can be greatly reduced, and the heating of the rotor is effectively reduced; meanwhile, because the carbon fiber material has the characteristics of small density, high tensile strength and small influence by temperature, safer and more effective protection can be provided for the novel mixed permanent magnet material under the condition that the rotor rotates at high speed, the uniformity, the integrity and the consistency of the mixed permanent magnet material magnetic powder can be greatly improved by the resin, the problem that the local stress of the motor rotor is overlarge due to high-speed operation is avoided, and the reliability of the strength of the motor rotor can be effectively ensured when the motor rotor rotates at high speed by adopting the novel mixed permanent magnet material uniform layering binding structure.
The stator slots on the stator for arranging the windings are pear-shaped slots, the windings are formed by upper and lower layers, short-distance lap winding connection is adopted, and the windings are wound in parallel by adopting a plurality of thin wires, so that the additional loss caused by skin effect can be effectively reduced; the stator core is formed by laminating ultrathin low-loss cold-rolled non-oriented electrical steel sheets, and can effectively reduce the core loss under high frequency.
An axial inner air channel is arranged between the stator winding and the periphery of the rotor; an air inlet and an air outlet of the air duct are arranged on the shell.
The advantages and effects:
the invention provides a novel high-speed permanent magnet motor with a novel integral structure, wherein a novel mixed permanent magnet material adopted by a rotor is formed by mixing permanent magnet material magnetic powder and resin and magnetizing the mixture to form a plurality of poles, carbon fibers (or glass filaments) of an inner layer and the novel mixed permanent magnet material of an outer layer form a unit layer, the carbon fibers or the glass filaments of the inner layer are used for fixing the inner structure of the rotor and improving the strength, and the novel mixed permanent magnet material of the outer layer is used for providing excitation. The mixed material and the carbon fiber (or glass fiber) are alternately arranged, after a plurality of unit layers are bound, a layer of carbon fiber is bound on the outermost layer of the mixed material to ensure the integral strength of the motor rotor, and then the high-speed permanent magnet motor rotor with a novel integral structure is formed. The novel motor rotor with the mixed permanent magnet material structure is uniformly bound by a plurality of unit layers from inside to outside. In the novel rotor with the integral permanent magnet structure, the permanent magnet material magnetic powder is mixed with resin, so that the eddy current loss in the rotor can be effectively reduced, the heat source of the motor is further reduced, and the temperature rise of the motor is reduced. The magnetic powder and the resin of the permanent magnet material are uniformly distributed on the circumferential surface of the rotor, so that the uniformity, the integrity and the consistency of the rotor can be ensured, and the phenomenon of uneven edge stress distribution caused by adopting a permanent magnet block structure can be avoided. Meanwhile, due to the winding of the carbon fiber, the carbon fiber has the characteristics of small density, high tensile strength and small influence of temperature, and can ensure the reliable operation of the permanent magnet rotor at high temperature and high speed.
The beneficial effects of the invention are as follows:
1. the novel rotor with the mixed permanent magnet integral structure adopts a circular structure formed by permanent magnet material magnetic powder and resin, replaces a block structure of magnetic steel blocks and filling blocks in a conventional motor, ensures the integrity, uniformity and consistency of the rotor of the high-speed permanent magnet motor, eliminates the problem of permanent magnet damage caused by overlarge local stress due to edge effect between the magnetic steel blocks of the conventional structure and between the magnetic steel and the filling blocks, further improves the tensile strength of the rotor of the high-speed permanent magnet motor, improves the rotation speed limit of the rotor, and increases the output power of the motor on the premise of unchanged volume, which cannot be realized by adopting the magnetic steel and filling block structure of the conventional motor.
2. The novel rotor with the integral structure is formed by uniformly binding 1,2,3, n unit layers from inside to outside, each unit layer comprises a mixed permanent magnet material for providing excitation and carbon fibers (or glass fibers) for increasing the strength of the rotor, and the integral strength of the rotor is ensured by binding one layer of carbon fibers on the outermost layer. The carbon fiber material has the characteristics of small density, high tensile strength and less influence by temperature, and the structure of the rotor which is uniformly layered and bound can greatly ensure the running reliability of the hybrid permanent magnet rotor under the condition of high speed and high temperature.
3. The novel mixed permanent magnet material is formed by mixing permanent magnet material magnetic powder and resin in proportion, the resin is an electrical poor conductor, eddy currents in the mixed permanent magnet material can be effectively reduced after the resin is mixed, loss of the part is reduced, and the problem that local heating is serious is solved.
4. The conductive permanent magnet material magnetic powder added in the outer unit layer of the uniform layered rotor can shield high-frequency electromagnetic waves, and high-frequency eddy current loss in the inner unit layer of the permanent magnet material magnetic powder is reduced. The structure can effectively reduce the heat source in the motor rotor, and radically solves the problem of overheating of the high-speed motor rotor.
5. The novel rotor with the integral structure has the advantages of high elastic modulus, high specific strength and low density, and can improve the inherent frequency of the rotor and the stable operation range of the motor rotor.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic circuit connection diagram of a motor according to the present invention.
FIG. 2 is a block diagram of a motor according to the present invention;
FIG. 3 is a schematic view of a unit layer structure of a motor rotor according to the present invention
FIG. 4 is an axial cross-sectional view of the motor rotor of the present invention;
in the figure: 1. the novel permanent magnet motor comprises a motor shell, an air duct inlet, a stator pressing plate, a stator iron core, a stator winding, an axial inner air duct, a novel mixed permanent magnet material, a winding end part, an air duct outlet, a motor end cover, a sliding bearing, a rotor iron core and carbon fiber (or glass fiber) and is characterized in that the motor shell, the air duct inlet, the stator pressing plate, the stator iron core, the stator winding and the axial inner air duct are arranged in sequence, the novel mixed permanent magnet material is arranged in sequence, the winding end part is arranged in sequence, the air duct outlet is arranged in sequence, the motor end cover is arranged in sequence, the sliding bearing is arranged in sequence, and the rotor iron core is arranged in sequence, and the carbon fiber (or glass fiber) is arranged in sequence.
The specific embodiment is as follows: the invention is described in detail below with reference to the attached drawing figures:
the utility model provides a novel high-speed motor of whole permanent magnet rotor structure, this motor includes casing (1), stator and the rotor of mixed permanent magnet material layering ligature structure, stator and rotor all set up in casing (1), the stator includes stator core (4) and stator winding (5), stator winding (5) set up in stator core (4), the rotor axial passes stator and leaves between rotor and the stator and supply cooling gas to pass through axial inner wind channel (6), be provided with wind channel entry (2) and wind channel outlet (9) on the casing at stator both ends respectively, wind channel entry (2) are through axial inner wind channel (6) intercommunication wind channel outlet (9).
The stator core (4) is provided with a hole which penetrates through the rotor with the hole in the axial direction, the stator winding (5) is arranged at the hole wall of the stator core (4), and an axial inner air channel (6) is formed between the stator winding (5) and the rotor penetrating through the hole.
Winding pressing plates (3) are further arranged at two ends of the stator.
The rotor comprises a rotor core (12), a novel mixed permanent magnet material (7) and a carbon fiber or glass fiber layer (14); the novel hybrid permanent magnet material (7) and the carbon fiber or glass fiber layer (14) are alternately arranged by adopting a layered binding structure, the carbon fiber or glass fiber layer (14) is arranged outside the rotor core (12), the novel hybrid permanent magnet material (7) is arranged outside the carbon fiber or glass fiber layer (14), the carbon fiber or glass fiber layer (14) is continuously arranged outside the novel hybrid permanent magnet material (7), and the like is alternately arranged, and then the carbon fiber is arranged outside the outermost layer.
The novel mixed permanent magnetic material is formed by mixing permanent magnetic material magnetic powder and resin
The novel rotor with the integral permanent magnet structure is characterized in that unit layers are uniformly increased from inside to outside along the radial direction, and a plurality of pole numbers are formed by integral magnetization.
End covers (10) are arranged at two ends of the shell (1).
The stator core (4) is provided with a stator slot for fixing windings, the stator slot is a pear-shaped slot, the winding components are in upper and lower layers, short-distance lap winding connection is adopted, and the windings are wound in parallel by adopting a plurality of thin wires.
The following detailed description is made with reference to the accompanying drawings:
as shown in fig. 1, the motor is driven by variable frequency. The motor winding is connected with a frequency converter, the inlet end of the frequency converter is connected with a power grid, the outlet end of the frequency converter is connected with the motor, the frequency of the power grid is increased by the frequency converter, and the high-speed rotation of the motor is realized through the frequency converter. The motor rotor is directly connected with the load, so that the operation of high-speed equipment is realized.
As shown in fig. 2, winding pressing plates 3 are installed at both ends of the stator core, and stator windings 5 are embedded in stator slots of the stator core 4. The stator slot adopts a pear-shaped slot, and the winding 5 adopts a form of a plurality of thin wires which are connected in parallel around a short distance Y, so that the additional loss under high-frequency driving can be reduced, larger cogging torque generated by larger slot opening size can be avoided, the torque fluctuation during the operation of the motor is reduced, and the motor can be operated more reliably. The motor rotor is radially and integrally magnetized after machining. When the motor operates, cold air enters the motor from the air inlet 2 of the shell, flows to the axial inner air channel 6 through the winding end part, flows out from the air channel outlet 11 of the motor through the winding end part at the other end, and completes cooling of the motor. The motor rotor with the mixed permanent magnet material layered binding structure consists of a novel mixed permanent magnet material 7 and a rotor core 12. Both ends of the rigid shaft are supported by slide bearings 11.
As shown in fig. 3, each unit layer is bound with a layer of very thin carbon fiber (or glass fiber) on the inner layer for fixing, then a novel mixed permanent magnet material is added on the outer layer for providing excitation for the motor, the novel mixed permanent magnet material is formed by uniformly mixing magnetic powder of the permanent magnet material and resin, a plurality of unit layers are overlapped to form the rotor structure, the resin is an electric bad conductor, eddy current in the mixed permanent magnet material can be effectively reduced after mixing, loss of the part is reduced, and the problem that local heating is serious is solved. Meanwhile, the layered structure distributes concentrated stress of the rotor in each unit layer during high-speed operation, so that the strength of the rotor is greatly increased, and the rotation speed limit of the rotor is improved.
As shown in fig. 4, the motor rotor is divided into a plurality of unit layers from inside to outside along the radial direction, carbon fibers (or glass fibers) of an inner layer in each unit layer are used for fixing, novel mixed permanent magnet materials in an outer layer are used for providing excitation, and after a plurality of unit layers are uniformly bound, the novel mixed permanent magnet material rotor structure is formed. When the motor operates, the rotor magnetic field links with the stator magnetic field, and the rotor provides excitation. Conductive permanent magnet added with external unit layer
The magnetic material magnetic powder can shield high-frequency electromagnetic waves, high-frequency eddy current loss in the inner unit layer permanent magnetic material magnetic powder is reduced, and the structure can effectively reduce a heat source in the motor rotor and radically solve the problem of overheating of the high-speed motor rotor. The structure ensures uniformity, integrity and consistency of the rotor in the circumferential direction, and meanwhile, the rotor structure has high elastic modulus, high specific strength and low density, and can improve the inherent frequency of the rotor and the stable operation range of the motor rotor. The carbon fiber material has the characteristics of small density, high tensile strength and less influence by temperature, can protect the permanent magnet more safely and effectively when running at high temperature and high speed, and avoids the problem of overlarge local stress in the high-speed running process of the motor.
The motor has the characteristics of higher reliability, simple structure, high rotor strength and the like.
(the magnetic field linkage is that the magnetic field generated by the rotor effectively enters the stator through the air gap to form a closed loop, so as to realize the electromechanical energy conversion of the motor).
The conductive permanent magnet material magnetic powder added in the outer unit layer of the novel integral permanent magnet rotor can shield high-frequency electromagnetic waves, and the high-frequency eddy current loss of the mixed permanent magnet material magnetic powder in the inner unit layer is reduced. The structure can effectively reduce the heat source in the motor rotor, and radically solves the problem of overheating of the high-speed motor rotor. Meanwhile, the structure ensures the uniformity, the integrity and the consistency of the motor rotor, and can mechanically solve the problem that the permanent magnet is broken due to larger tensile stress under the condition of high-speed rotation.
Claims (6)
1. The utility model provides a novel high-speed motor of whole permanent magnet rotor structure which characterized in that: the motor comprises a shell (1), a stator and a rotor with a mixed permanent magnet material layered binding structure, wherein the stator and the rotor are both arranged in the shell (1), the stator comprises a stator iron core (4) and a stator winding (5), the stator winding (5) is arranged in the stator iron core (4), the rotor axially penetrates through the stator, an axial inner air channel (6) for cooling gas to pass through is reserved between the rotor and the stator, an air channel inlet (2) and an air channel outlet (9) are respectively arranged on shells at two ends of the stator, and the air channel inlet (2) is communicated with the air channel outlet (9) through the axial inner air channel (6);
the stator core (4) is provided with a hole which penetrates through the rotor car and penetrates through the hole in the axial direction, and the stator winding (5) is arranged in the hole wall of the stator core (4);
the rotor comprises a rotor core (12), a novel mixed permanent magnet material (7) and a carbon fiber or glass fiber layer (14); the novel mixed permanent magnet material (7) and the carbon fiber or glass fiber layers (14) are alternately arranged by adopting a layered binding structure, the carbon fiber or glass fiber layers (14) are arranged outside the rotor core (12), the novel mixed permanent magnet material (7) is arranged outside the carbon fiber or glass fiber layers (14), the carbon fiber or glass fiber layers (14) are continuously arranged outside the novel mixed permanent magnet material (7), and the like are alternately arranged, and then the carbon fiber is arranged outside the outermost layer; the rotor with the integral structure is formed by uniformly binding 1,2,3 and n unit layers from inside to outside;
the novel mixed permanent magnetic material is formed by mixing permanent magnetic material magnetic powder and resin.
2. A high speed motor of novel unitary permanent magnet rotor construction according to claim 1 wherein: winding pressing plates (3) are further arranged at two ends of the stator.
3. A high speed motor of novel unitary permanent magnet rotor construction according to claim 1 wherein: the novel rotor with the integral permanent magnet structure is characterized in that unit layers are uniformly increased from inside to outside along the radial direction, and a plurality of pole numbers are formed by integral magnetization.
4. A high speed motor of novel unitary permanent magnet rotor construction according to claim 1 wherein: end covers (10) are arranged at two ends of the shell (1).
5. A high speed motor of novel unitary permanent magnet rotor construction according to claim 1 wherein: a stator groove for fixing a winding is formed in the inner wall of a hole of a stator iron core (4), the stator groove is a pear-shaped groove, the winding is arranged in the pear-shaped groove, an upper layer and a lower layer of winding components are connected through short-distance lap windings, and the winding is wound in parallel by adopting a plurality of thin wires.
6. A novel high speed motor of unitary permanent magnet rotor construction according to claim 5 wherein: the plurality of parallel windings of the thin wires are in a form of short-distance Y connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810196143.2A CN108418325B (en) | 2018-03-09 | 2018-03-09 | Novel high-speed motor with integral permanent magnet rotor structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810196143.2A CN108418325B (en) | 2018-03-09 | 2018-03-09 | Novel high-speed motor with integral permanent magnet rotor structure |
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| Publication Number | Publication Date |
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| CN108418325A CN108418325A (en) | 2018-08-17 |
| CN108418325B true CN108418325B (en) | 2023-10-27 |
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| CN201810196143.2A Active CN108418325B (en) | 2018-03-09 | 2018-03-09 | Novel high-speed motor with integral permanent magnet rotor structure |
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| CN210839174U (en) * | 2019-12-11 | 2020-06-23 | 南京磁谷科技有限公司 | Cooling air duct structure of cooling stator for centrifugal compressor |
| CN113612327A (en) * | 2021-08-10 | 2021-11-05 | 哈尔滨电机厂有限责任公司 | Permanent magnet synchronous motor |
Citations (10)
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| JP3509304B2 (en) * | 1995-06-28 | 2004-03-22 | 株式会社明電舎 | Rotor permanent magnet |
| JP2000050545A (en) * | 1998-07-31 | 2000-02-18 | Sumitomo Special Metals Co Ltd | Rotor for generator or motor |
| JP2001238381A (en) * | 2000-02-21 | 2001-08-31 | Mitsubishi Heavy Ind Ltd | Electric rotating machine |
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| CN108418325A (en) | 2018-08-17 |
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