CN108448856B - High-speed generator adopting radial layered composite integral permanent magnet outer rotor - Google Patents
High-speed generator adopting radial layered composite integral permanent magnet outer rotor Download PDFInfo
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- CN108448856B CN108448856B CN201810196613.5A CN201810196613A CN108448856B CN 108448856 B CN108448856 B CN 108448856B CN 201810196613 A CN201810196613 A CN 201810196613A CN 108448856 B CN108448856 B CN 108448856B
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- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims description 66
- 238000004804 winding Methods 0.000 claims description 53
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 46
- 239000004917 carbon fiber Substances 0.000 claims description 46
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 34
- 239000003365 glass fiber Substances 0.000 claims description 29
- 239000006247 magnetic powder Substances 0.000 claims description 29
- 239000011347 resin Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 18
- 239000000696 magnetic material Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 9
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 4
- 238000013021 overheating Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 110
- 230000005284 excitation Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
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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
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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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
- H02K1/2786—Outer rotors
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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
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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
- H02K3/28—Layout of windings or of connections between windings
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
A high-speed generator adopting radial layered composite integral permanent magnet outer rotor is characterized in that: the high-speed motor includes an outer rotor and a stator disposed within the outer rotor; the stator is arranged in the axial through hole of the outer rotor, and a gap is reserved between the stator and the outer rotor; 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 high-speed generator adopting a radial layered composite integral permanent magnet outer rotor. Belongs to the field of motors.
Background
The high-speed permanent magnet synchronous generator has high power density and high rotating speed, and the motor volume is far smaller than that of a medium-low rotating speed motor with the same output power, so that the material can be effectively saved; the high-speed motor has small size, so that the motor has small moment of inertia and quick dynamic response capability; the high-speed motor can be directly connected with the prime motor, so that the traditional mechanical speed change device is omitted, the efficiency of a traditional system can be improved, and the noise is reduced. Especially, the permanent magnet generator has the advantages of high power energy density, simple structure, no excitation loss, high efficiency and the like, and is particularly suitable for being used as a medium-sized and small-sized high-speed motor. Along with the industrial electrification process, the high-speed motor is used for replacing the original diesel engine as a power source, so that the high-speed permanent magnet generator has a great number of remarkable advantages, such as improving the use efficiency of energy sources, reducing environmental noise and the like, and the research and application of the high-speed permanent magnet generator meet the economic development needs of energy conservation and emission reduction, and is one of research hotspots in the international electrotechnical field at present, and has a wide development prospect in aviation, ships, hybrid electric vehicles, high-speed grinding machines, energy storage flywheels and distributed power generation systems.
Compared with a common motor, the high-speed permanent magnet generator has the advantages that the design difficulty is high, 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 high under the condition that the motor rotates at a high speed, 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 high, the heat dissipation of the rotor of the motor is difficult, the temperature rise of the rotor of the motor is too high, the permanent magnet can be irreversibly demagnetized under the condition that the temperature is too high, and serious harm is caused to the motor, so that the loss of the rotor of the motor is one of 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. Compared with an inner rotor high-speed motor, the diameter of the outer rotor motor is large, the centrifugal force born by high-speed rotation is larger, and meanwhile, the rotor is directly matched with other structures and needs to bear certain pressure load, so that higher requirements are put on the strength of the rotor.
Disclosure of Invention
The invention aims to: the invention provides a high-speed generator adopting a radial layered composite integral permanent magnet outer rotor, which aims to solve the problems that the permanent magnet strength is insufficient and the damage is caused under the condition of high-speed rotation of the traditional high-speed permanent magnet motor, the permanent magnet is irreversibly demagnetized due to high eddy current loss of the rotor and difficult heat dissipation, the reliability and the service life of the motor are seriously influenced, and the operation reliability of the motor is greatly improved.
The technical scheme is as follows: the invention adopts the following technical scheme:
a high-speed generator adopting radial layered composite integral permanent magnet outer rotor is characterized in that: the high-speed motor includes an outer rotor and a stator disposed within the outer rotor; the stator is arranged in the axial through hole of the outer rotor, and a gap is reserved between the stator and the outer rotor;
the stator comprises a stator core and a stator winding; the stator winding is arranged in a stator slot formed in the outer side wall of the stator core, and the opening of the stator slot faces the outer rotor;
the rotor comprises a rotor yoke and three mixed permanent magnet structural unit layers; the three mixed permanent magnet structure unit layers are divided into an outer permanent magnet structure unit layer, a middle permanent magnet structure unit layer and an inner permanent magnet structure unit layer; the inner permanent magnet structure unit layer, the middle permanent magnet structure unit layer and the outer permanent magnet structure unit layer are sequentially connected from inside to outside, and the outer permanent magnet structure unit layer is arranged on the inner wall of the through hole of the rotor yoke;
each mixed permanent magnet structure unit layer consists of an outer carbon fiber or glass fiber layer and an inner mixed permanent magnet material layer; and after the three mixed permanent magnet structural unit layers are combined, a structure in which the mixed permanent magnet material layers and the carbon fiber or glass fiber layers are bound alternately is formed, and the carbon fiber or glass fiber layers of the outer permanent magnet structural unit layers are connected with the inner wall of the through hole of the rotor yoke. The novel mixed permanent magnet structure is formed by alternately binding novel mixed permanent magnet materials and carbon fibers, the novel mixed permanent magnet materials face the stator winding no matter how many layers are, and then a layer of carbon fibers is added outside the layer facing the stator winding.
Winding pressing plates are arranged at two ends of the stator. (the winding pressing plate adopts insulating heat-conducting material, and has the main functions of fixing the end parts of the two ends of the winding, and simultaneously, the pressing plate can effectively exchange heat between the winding end parts and the stator, thereby being beneficial to reducing the temperature rise of the winding end parts.)
And binding a layer of carbon fiber on the inner wall of the innermost mixed permanent magnet unit, thereby forming the outer rotor high-speed permanent magnet motor rotor of the mixed permanent magnet material layered binding structure.
The three mixed permanent magnet structure unit layers sequentially decrease the content of permanent magnet material magnetic powder in the mixed permanent magnet material layers along with the increase of the unit layers from inside to outside, the thickness of the carbon fiber or glass fiber layer is sequentially thickened, the thickness of the carbon fiber or glass fiber layer bound on the outermost layer is maximum, and the mixed permanent magnet material layers are wholly magnetized to form a plurality of poles. (according to the power grade of the motor, the maximum outer diameter of the rotor of the motor is determined, the required excitation of the motor is determined, the number of rotor layering and the content of magnetic powder are primarily estimated, the number of layering and the content of magnetic powder of each layer are finally determined through magnetic circuit calculation and iteration for a plurality of times, the thickness increase of carbon fiber or glass fiber is calculated according to accurate finite element calculation, the thickness of the carbon fiber or glass fiber of an outer unit layer is calculated to be enough to ensure the reliability of the mixed permanent magnet material of an inner unit layer), and the thickness is in direct proportion to the square of the radius of the rotor after bundling.
The stator slot for setting the winding is pear-shaped slot, the winding is composed of an upper layer and a lower layer, short-distance lap winding connection is adopted, 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 mixed permanent magnetic material layer is formed by uniformly 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 stator core is formed by laminating ultrathin low-loss cold-rolled non-oriented electrical steel sheets.
The stator of the high-speed generator is provided with a stationary shaft, a pear-shaped groove is adopted in the stator, a double-layer short-distance winding is adopted in the winding, and winding pressing plates are arranged at two ends of a stator core. The permanent magnet outer rotor is mainly characterized by adopting a layered binding structure of mixed permanent magnet materials, wherein the mixed permanent magnet materials are formed by mixing permanent magnet material magnetic powder with resin, each unit layer is formed by outer carbon fiber (or glass fiber) and inner mixed permanent magnet materials, the outer carbon fiber (or glass fiber) is used for fixing, and the inner mixed permanent magnet materials are used for providing excitation. The mixed permanent magnet material and the carbon fiber (or glass fiber) are bound and alternately placed, after a plurality of unit layers are bound, a layer of carbon fiber is bound on the outermost layer of the mixed permanent magnet material to ensure the integral strength of the motor rotor, and then the rotor of the high-speed permanent magnet generator adopting the radial layered composite integral permanent magnet outer rotor is formed. Along with the increase of the number of unit layers from inside to outside along the radial direction, the content of the magnetic powder of the permanent magnetic material is sequentially reduced, the thickness of the bound carbon fiber (or glass fiber) is sequentially thickened, and the whole is magnetized to form a plurality of poles.
Carbon fibers and resin in the radial layered outer rotor structure of the mixed permanent magnetic material are all electric insulation materials, and the permanent magnetic material magnetic powder with larger conductivity is mixed with the resin and is layered and bound with the carbon fibers to form the outer rotor of the radial layered structure of the mixed permanent magnetic material, so that 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, as 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 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 of overlarge local stress caused by the high-speed operation of the motor rotor is avoided, and the reliability of the strength of the motor rotor during the high-speed rotation can be effectively ensured by adopting the radial layered structure of the mixed permanent magnet material.
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.
The advantages and effects:
the invention provides a radial layered composite integral permanent magnet outer rotor high-speed permanent magnet generator, wherein the mixed permanent magnet material adopted by the outer rotor is formed by mixing permanent magnet material magnetic powder and resin and magnetizing to form a plurality of poles, each unit layer is formed by carbon fibers (or glass fibers) of an outer layer and the mixed permanent magnet material of an inner layer, the carbon fibers (or glass fibers) of the outer layer are used for fixing the inner structure of the rotor and improving the strength, and the mixed permanent magnet material of the inner layer is used for providing excitation. The mixed permanent magnet material and carbon fiber (or glass fiber) are bound and alternately placed, after a plurality of unit layers are bound, a layer of carbon fiber is bound on the outermost layer of the mixed permanent magnet material to ensure the integral strength of the motor rotor, and then the radial layered composite integral permanent magnet outer rotor high-speed permanent magnet generator rotor is formed. According to the motor rotor with the mixed permanent magnet material layered binding structure, as the number of unit layers is increased, the content of the permanent magnet material magnetic powder is sequentially reduced, the thickness of the carbon fiber (or glass fiber) is sequentially increased, the requirement of the outermost layer of the rotor on strength is maximum, and therefore the thickness of the carbon fiber bound by the outermost layer is larger. In the rotor layered structure, the permanent magnet material magnetic powder is mixed with the 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 integrity and 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, large 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 radial layered composite integral permanent magnet outer rotor structure adopts a circular ring-shaped structure formed by 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 a 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 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 radial layered composite integral permanent magnet outer rotor consists of 1,2,3, n unit layers from inside to outside, wherein each unit layer contains a mixed permanent magnet material for providing excitation and carbon fibers (or glass fibers) for increasing the strength of the rotor, and a layer of carbon fibers is bound on the outermost layer to ensure the integral strength of the rotor. The carbon fiber material has the characteristics of small density, high tensile strength and less influence by temperature, and the layered binding structure of the rotor can greatly ensure the running reliability of the hybrid permanent magnet rotor under the condition of high speed and high temperature.
3. The mixed permanent magnetic material is formed by mixing permanent magnetic material magnetic powder and resin in proportion, the resin is an electric bad conductor, the eddy current in the mixed permanent magnetic material can be effectively reduced after the resin is mixed, the loss of the part is reduced, and the problem of serious local heating of the part is solved.
4. According to the radial layered rotor structure, the conductive permanent magnet material magnetic powder added in the inner unit layer can shield high-frequency electromagnetic waves, and the high-frequency eddy current loss of the permanent magnet material magnetic powder in the outer unit layer mixed permanent magnet material 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 radial layered outer 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.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description.
FIG. 1 is a diagram of a connection state used in the present invention;
FIG. 2 is an overall block diagram of the motor of the present invention;
FIG. 3 is a schematic view of a layer structure of a rotor unit of the motor according to the present invention;
FIG. 4 is an axial cross-sectional view of the present invention;
in the figure: 1. the novel permanent magnet rotor comprises a static shaft, a winding pressing plate, a stator winding, a rotor yoke, a stator core, an air gap, a novel mixed permanent magnet rotor outer layer, a novel mixed permanent magnet rotor middle layer, a novel mixed permanent magnet rotor inner layer, a winding end portion and a sliding bearing.
The specific embodiment is as follows: the invention is described in detail below with reference to the attached drawing figures:
a high-speed generator adopting radial layered composite integral permanent magnet outer rotor is characterized in that: the high-speed motor includes an outer rotor and a stator disposed within the outer rotor; the stator is arranged in the axial through hole of the outer rotor, and a gap is reserved between the stator and the outer rotor;
the stator comprises a stator core 5 and a stator winding 3; the stator winding 3 is arranged in a stator slot formed in the outer side wall of the stator core 5, and the opening of the stator slot faces the outer rotor;
the rotor comprises a rotor yoke 4 and three mixed permanent magnet structural unit layers; the three mixed permanent magnet structure unit layers are divided into an outer permanent magnet structure unit layer 7, a middle permanent magnet structure unit layer 8 and an inner permanent magnet structure unit layer 9; the inner permanent magnet structural unit layer 9, the middle permanent magnet structural unit layer 8 and the outer permanent magnet structural unit layer 7 are sequentially connected from inside to outside, and the outer permanent magnet structural unit layer 7 is arranged on the inner wall of the through hole of the rotor yoke 4;
each mixed permanent magnet structure unit layer consists of an outer carbon fiber or glass fiber layer 13 and an inner mixed permanent magnet material layer 12; the three mixed permanent magnet structural unit layers are combined to form a structure that the mixed permanent magnet material layers and the carbon fiber or glass fiber layers are bound alternately, and the carbon fiber or glass fiber layers 13 of the outer permanent magnet structural unit layer 7 are connected with the inner wall of the through hole of the rotor yoke 4.
Winding pressing plates 2 are also arranged at two ends of the stator.
And binding a layer of carbon fiber on the inner wall of the innermost mixed permanent magnet unit, thereby forming the outer rotor high-speed permanent magnet motor rotor of the mixed permanent magnet material layered binding structure.
The three mixed permanent magnet structure unit layers sequentially decrease the content of permanent magnet material magnetic powder in the mixed permanent magnet material layers along with the increase of the unit layers from inside to outside, the thickness of the carbon fiber or glass fiber layer is sequentially thickened, the thickness of the carbon fiber or glass fiber layer bound on the outermost layer is maximum, and the mixed permanent magnet material layers are wholly magnetized to form a plurality of poles.
The stator slot for setting the winding is pear-shaped slot, the winding is composed of an upper layer and a lower layer, short-distance lap winding connection is adopted, and the winding is wound in parallel by adopting a plurality of thin wires.
The mixed permanent magnetic material layer is formed by uniformly mixing permanent magnetic material magnetic powder and resin.
The stator core is formed by laminating ultrathin low-loss cold-rolled non-oriented electrical steel sheets.
As shown in fig. 1, the prime mover pulls the motor. The motor winding is connected with the rectifier, and the electric energy is fed back to the power grid through rectification inversion.
As shown in fig. 2, the radial layered composite integral permanent magnet outer rotor high-speed permanent magnet generator comprises an outer rotor, an inner stator and a static shaft; the stator comprises a stator core 5, a stator winding 3 and a winding pressing plate 2, wherein the stator winding 3 is arranged in the stator core 5, the winding pressing plate 2 is arranged at two ends of the stator, and an outer rotor permanent magnet is fixed with a rotor yoke. The radial layered composite integral permanent magnet outer rotor adopts a structure of uniformly layering and binding mixed permanent magnet materials and carbon fibers, wherein the mixed permanent magnet materials are formed by mixing permanent magnet material magnetic powder and resin and magnetizing the mixed permanent magnet materials to form a plurality of pole numbers.
As shown in fig. 3, each unit layer is bound with a layer of carbon fiber (or glass fiber) on the outer layer for fixation, then a mixed permanent magnet material is added on the inner layer for providing excitation for the motor, the mixed permanent magnet material is formed by uniformly mixing magnetic powder of the permanent magnet material and resin, and a plurality of unit layers are overlapped to form the radial layered rotor structure, wherein the resin is an electrical poor conductor, after mixing, the eddy current in the mixed permanent magnet material can be effectively reduced, the loss of the part is reduced, and the problem of serious local heating of the part 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 according to the content of magnetic powder from inside to outside along the radial direction, carbon fibers (or glass fibers) of an outer layer in each unit layer are used for fixing, and mixed permanent magnet materials in an inner layer are used for providing excitation. When the motor runs, the rotor magnetic field and the stator magnetic field are hinged, and the rotor provides excitation, so that the reliability of strength in the outer unit layer is ensured for better improving the utilization rate of materials, the magnetic powder content in each unit layer is sequentially reduced from inside to outside in the layered rotor processing process, and the thickness of the carbon fiber (or glass fiber) is sequentially thickened. Meanwhile, the conductive permanent magnet material magnetic powder added in the inner unit layer can shield high-frequency electromagnetic waves, high-frequency eddy current loss in the outer unit layer permanent magnet 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 outer rotor high-speed permanent magnet 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 conductive permanent magnet material magnetic powder added in the inner unit layer of the layered rotor can shield high-frequency electromagnetic waves, and the high-frequency eddy current loss of the mixed permanent magnet material magnetic powder of the outer 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 (2)
1. A high-speed generator adopting radial layered composite integral permanent magnet outer rotor is characterized in that: the high-speed generator comprises an outer rotor and a stator arranged in the outer rotor; the stator is arranged in the axial through hole of the outer rotor, and a gap is reserved between the stator and the outer rotor;
the stator comprises a stator core (5) and a stator winding (3); the stator winding (3) is arranged in a stator groove formed in the outer side wall of the stator core (5), and the opening of the stator groove faces the outer rotor;
the rotor comprises a rotor yoke (4) and three mixed permanent magnet structural unit layers; the three mixed permanent magnet structure unit layers are divided into an outer permanent magnet structure unit layer (7), a middle permanent magnet structure unit layer (8) and an inner permanent magnet structure unit layer (9); the inner permanent magnet structure unit layer (9), the middle permanent magnet structure unit layer (8) and the outer permanent magnet structure unit layer (7) are sequentially connected from inside to outside, and the outer permanent magnet structure unit layer (7) is arranged on the inner wall of a through hole of the rotor yoke (4);
each mixed permanent magnet structure unit layer consists of an outer carbon fiber or glass fiber layer (13) and an inner mixed permanent magnet material layer (12); after the three mixed permanent magnet structure unit layers are combined, a structure of binding the mixed permanent magnet material layers with carbon fibers or glass fiber layers alternately is formed, and the carbon fibers or glass fiber layers (13) of the outer permanent magnet structure unit layer (7) are connected with the inner wall of a through hole of the rotor yoke (4);
winding pressing plates (2) are arranged at two ends of the stator;
the three mixed permanent magnet structure unit layers sequentially decrease the content of permanent magnet material magnetic powder in the mixed permanent magnet material layers along with the increase of the number of unit layers from inside to outside, the thickness of the carbon fiber or glass fiber layer is sequentially thickened, the thickness of the carbon fiber or glass fiber layer bound on the outermost layer is maximum, and the mixed permanent magnet material layers are wholly magnetized to form a plurality of pole numbers;
binding a layer of carbon fiber on the inner wall of the innermost mixed permanent magnet unit to form an outer rotor high-speed permanent magnet generator rotor with a mixed permanent magnet material layered binding structure;
the stator slot for arranging the winding is a pear-shaped slot, the winding is composed of an upper layer and a lower layer, short-distance lap winding connection is adopted, and the winding is formed by parallel winding of a plurality of thin wires;
the mixed permanent magnetic material layer is formed by uniformly mixing permanent magnetic material magnetic powder and resin.
2. A high speed generator employing radially layered composite integral permanent magnet outer rotor as claimed in claim 1, wherein: the stator core is formed by laminating ultrathin low-loss cold-rolled non-oriented electrical steel sheets.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810196613.5A CN108448856B (en) | 2018-03-09 | 2018-03-09 | High-speed generator adopting radial layered composite integral permanent magnet outer rotor |
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| CN201810196613.5A CN108448856B (en) | 2018-03-09 | 2018-03-09 | High-speed generator adopting radial layered composite integral permanent magnet outer rotor |
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| CN108448856A CN108448856A (en) | 2018-08-24 |
| CN108448856B true CN108448856B (en) | 2023-10-31 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4893040A (en) * | 1987-05-08 | 1990-01-09 | Aisin Seiki Kabushiki Kaisha | Dynamo-electric machines |
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