CN109274240B - Composite amorphous alloy axial flux motor - Google Patents
Composite amorphous alloy axial flux motor Download PDFInfo
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- CN109274240B CN109274240B CN201811157231.8A CN201811157231A CN109274240B CN 109274240 B CN109274240 B CN 109274240B CN 201811157231 A CN201811157231 A CN 201811157231A CN 109274240 B CN109274240 B CN 109274240B
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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
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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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
- H02K1/2793—Rotors axially facing stators
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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
- H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
Abstract
A composite amorphous alloy axial flux motor is characterized in that a plurality of inner tooth parts and outer tooth parts of a stator are uniformly distributed on a yoke part of the stator in the circumferential direction, a stator core is embedded into a shell, a direct-current excitation winding is wound on the outer tooth parts, an armature winding is further wound on the whole of each outer tooth part and the inner tooth part on the inner side of the outer tooth part, a rotor is assembled on a rotating shaft, permanent magnets and first soft magnetic poles are uniformly arranged on one side, close to the stator, of a rotor yoke in the circumferential direction and are in mutual contact with first soft magnetic poles, the permanent magnets and the first soft magnetic poles correspond to the circumferential positions of the inner tooth parts, second soft magnetic poles correspond to the circumferential positions of the outer tooth parts, the second soft magnetic poles and the permanent magnets on the inner side of the circumferential direction of the second soft magnetic poles pass through magnetic isolation regions, end. The invention not only inherits the characteristics of large power density, large torque density, high efficiency and the like of the axial flux permanent magnet motor, but also has the advantages of smoothness and adjustability of an air gap magnetic field of the electric excitation motor and the like.
Description
Technical Field
The invention belongs to the field of axial flux motors, and mainly relates to a composite amorphous alloy axial flux motor.
Background
The amorphous alloy strip is used as a novel soft magnetic material, the thickness of the strip is only 0.02-0.03mm, and the amorphous alloy strip has the characteristics of excellent electromagnetic property, good corrosion resistance, good wear resistance, extremely high strength, hardness, resistivity and the like. Compared with the traditional silicon steel sheet, the amorphous alloy has extremely low iron core loss, can obviously improve the efficiency of the motor when being applied to the motor as an iron core material, and is particularly suitable for high-speed and high-frequency application occasions. The traditional amorphous alloy axial flux permanent magnet synchronous motor adopts a double-stator single-rotor or double-rotor single-stator structure with a permanent magnet surface-mounted type (or a permanent magnet embedded in a non-magnetic metal disc), and has the advantages of high efficiency, high power density and high torque density. However, due to the inherent characteristics of the permanent magnet material, the air gap magnetic field in the amorphous alloy axial flux permanent magnet synchronous motor is basically kept constant, and the traditional amorphous alloy axial flux permanent magnet synchronous motor generally adopts the surface-mounted magnetic pole structure, the structure has large air gap, small inductance and basically equal quadrature-direct axis inductance, and the motor has the problems of difficult excitation regulation, narrow field weakening speed regulation range, relatively large permanent magnet consumption and the like, and becomes one of the bottlenecks restricting the development of the motor. The application of the amorphous alloy axial flux permanent magnet synchronous motor is greatly restricted.
In order to pursue the effects of high power torque density, high efficiency and controllable magnetic field of the motor, many researchers have proposed different kinds of topological structures in a mixed excitation form to solve the problems that the magnetic field of the traditional permanent magnet synchronous motor is difficult to adjust and is not beneficial to flux weakening and speed expansion, but the defects of different degrees still exist:
(1) chinese patent CN105305749A proposes an axial flux motor with a stator having no iron core and a Halbach permanent magnet array. The permanent magnet motor comprises two permanent magnet rotors, wherein the two permanent magnet rotors are arranged on a rotating shaft in a mode that permanent magnet surfaces are opposite, and a circular ring synthesized by high polymer materials is arranged between the rotors; radial guide grooves are regularly arranged in the circumferential directions of the front surface and the back surface of the circular ring synthesized by the high polymer material and used for installing stator winding coils of the excitation wire; the permanent magnet rotor is composed of segmented permanent magnets of a rotor magnetic conduction back yoke: 12 permanent magnets with different magnetizing aspects are arranged under each pair of poles, the axial magnetizing aspect of the first permanent magnet is defined to be 0 degree, and the magnetizing directions of the adjacent permanent magnets are changed by 30 degrees in sequence, so that the Halbach array is realized. The invention is characterized in that: the permanent magnet on the axial flux motor rotor is magnetized according to the Halbach array, so that the harmonic content of air gap flux density is greatly reduced, but the structure process is complex, the consumption of the permanent magnet is high, and the popularization and the production are not facilitated.
(2) Chinese patent CN103997145A proposes an axial flux permanent magnet synchronous motor. The motor comprises a rotating shaft, a rotor assembled on the rotating shaft, at least one permanent magnet assembled on the rotor, and a stator assembly, wherein the stator assembly comprises stator modules facing to an axial direction, each stator module comprises a pair of stator teeth connected by a yoke part and a plurality of windings, and each winding is wound on one stator module. The invention is characterized in that: the axial flux motor uses low-cost ferrite magnets, achieves higher power density and efficiency achieved by other high-cost neodymium iron boron, does not generate cogging torque, and reduces vibration noise, but the motor hardly plays the advantages in high-frequency and high-speed occasions.
(3) Chinese patent CN10530757A proposes a topological structure of a double-interleaved hybrid excitation motor, which comprises a front end cover, a rear end cover and a casing, wherein a rotor yoke is arranged on a rotating shaft, a permanent magnet N pole, a permanent magnet S pole and an iron pole are fixed on the rotor yoke, an armature core and an excitation core are uniformly arranged on the casing, an ac armature winding is arranged on the armature core, and an ac excitation winding is arranged on the excitation core; the rotating shaft, the rotor yoke, the permanent magnet N pole, the permanent magnet S pole and the iron pole form a rotor; the AC armature winding, the armature core, the AC exciting winding, the exciting core and the casing constitute a stator. The invention is characterized in that: the motor is a radial magnetic flux structure, alternating current is adopted to adjust air gap magnetic flux, excitation magnetomotive force and armature magnetomotive force are in parallel connection, the size of induced potential is changed by adjusting the distribution of the magnetic flux, and a wider speed regulation range can be realized in a variable speed electric occasion.
(4) Chinese patent CN104638792A proposes a topology structure of a hybrid excitation motor. The motor comprises a stator and a rotor arranged in the stator, wherein the rotor comprises a rotor frame forming a main supporting part of the rotor, and magnetic steel and an excitation winding which are arranged on the rotor frame; the magnetic poles of the first magnetic steel and the second magnetic steel close to one end of the circumference of the rotor are the same, and the volume of the first magnetic steel is larger than that of the second magnetic steel. The invention is characterized in that; the motor has a larger speed regulation range and less rare earth usage, and the manufacturing cost is reduced, but the torque density, the power density and the efficiency of the motor are all reduced, and the motor is not beneficial to being applied to high-frequency and high-speed occasions.
(5) Chinese patent CN103490583A proposes a topological structure of a stator-segmented axial flux-switching hybrid excitation synchronous motor, in which, the motor stator is formed by splicing two layers of "H" type unit stator cores into two wound concentric rings, a magnetism isolating ring separates the two concentric rings, an armature winding adopts a concentrated winding, the armature winding is wound on the stator teeth of two adjacent "H" type unit stator cores, the permanent magnet and the stator slot both adopt a rectangular structure, an excitation bracket is located right above the permanent magnet and separated by the magnetism isolating ring, the excitation winding is wound on the excitation bracket axially, the rotor adopts a disk structure, including a rotor yoke and rotor poles uniformly fixed on the surface in a radial manner, and the stator and the rotor are coaxially connected. The stator is divided into an inner part and an outer part by a magnetism isolating ring. The invention is characterized in that: the electric excitation magnetic circuit and the permanent magnet magnetic circuit are completely connected in parallel, the coupling of the two magnetic circuits is reduced, the utilization rate of the permanent magnet is greatly improved, and the efficiency of the motor is obviously improved. However, the motor has reduced torque density, power density and efficiency, and has a limited range of vibration noise spread, and is not suitable for high-frequency and high-speed applications.
(6) Chinese patent CN1808846A proposes a topology structure of a dual-feed hybrid excitation axial magnetic field permanent magnet motor. The motor comprises a rotor, a left stator and a right stator which are arranged on two sides of the rotor, wherein the magnetic pole of the rotor is divided into an inner ring and an outer ring by a magnetic isolation area, the outer ring is an iron core pole, and the inner ring is a permanent magnet with alternating polarity; the inner sides of the outer teeth of the two stator cores are provided with magnetic field control windings, and the armature main winding is arranged around the inner and outer teeth. The invention is characterized in that: the total magnetic flux of the air gap of the motor is adjusted by changing the current amplitude and direction in the magnetic field control winding, so that the purpose of changing the magnitude of the induced potential is achieved, but the motor with the structure has large permanent magnet consumption and a limited weak magnetic speed expansion range.
Disclosure of Invention
Object of the Invention
The air gap magnetic field in the axial flux permanent magnet synchronous motor is basically kept constant, the air gap is large, the number of turns of each phase in series is small, and the flux-weakening speed expansion is not facilitated. In order to realize simple, flexible, economic and effective regulation and control of an air gap field of an axial flux permanent magnet synchronous motor, thereby improving the speed regulation and driving performance of the motor and avoiding the occurrence of irreversible demagnetization of a permanent magnet, a composite amorphous alloy axial flux motor is introduced.
Technical scheme
The utility model provides a compound metallic glass axial flux motor, includes stator, casing, end cover, pivot, bearing and rotor, its characterized in that: the stator core is an amorphous alloy stator core, the stator core comprises two parts of a stator yoke part and a stator tooth part, the stator tooth part consists of an inner tooth part and an outer tooth part, the inner tooth parts and the outer tooth parts are uniformly distributed on the stator yoke part in the circumferential direction, the inner tooth part is arranged on the inner side of each outer tooth part, the stator core is embedded in a machine shell, a direct-current excitation winding is wound on the outer tooth part, a first insulator is arranged between the direct-current excitation winding and the outer tooth part, an armature winding is integrally wound on the inner tooth part of each outer tooth part and the inner tooth part of each outer tooth part, a fourth insulator is arranged between the armature winding and the direct-current excitation winding inside the armature winding, the rotor is assembled on a rotating shaft, the rotor comprises a rotor yoke, a rotor bracket, a second soft magnetic pole, a permanent magnet and a first soft magnetic pole, the second soft magnetic pole, the permanent magnet and the first soft magnetic, the inner side of each second soft magnetic pole is provided with a permanent magnet, the inner side of each permanent magnet is provided with a first soft magnetic pole, the permanent magnet is in contact with the first soft magnetic pole, the permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth part, the second soft magnetic pole corresponds to the circumferential position of the outer tooth part, the second soft magnetic pole is isolated from the permanent magnet on the inner circumferential side of the second soft magnetic pole through a magnetic isolation area, two ends of the shell are respectively provided with an end cover, and a rotating shaft of the motor is supported in the center of the end cover through a bearing.
The stator tooth parts are positioned on two sides of the stator yoke part, the rotors are arranged on two sides of the stator core, the rotor yoke is made of soft magnetic materials, the magnetic poles of the permanent magnets of the rotors on the two sides are opposite and have different polarities, the axial flux motor with the single-stator double-rotor structure is formed, the armature windings and the direct current excitation windings are arranged in an annular mode on a radial plane and have non-overlapping performance, and the two sets of the armature windings and the direct current excitation windings are completely symmetrical in the axial direction.
The stator core is formed by winding an amorphous alloy strip, a tooth part of the stator core is divided into an inner tooth part and an outer tooth part, an auxiliary groove is formed between the inner tooth part and the outer tooth part, the auxiliary groove corresponds to the circumferential position of a magnetism isolating area of the rotor, a radial groove is formed between the tooth parts of the adjacent stator cores, a direct current excitation winding is wound on the outer tooth part through the radial groove and the auxiliary groove, and the direct current excitation winding is not in contact with the adjacent outer tooth part and the inner tooth part on the inner side.
The direct-current excitation winding is located on the periphery of the outer tooth portion, three sides of the direct-current excitation winding are surrounded by the stator armature winding, a first insulator is arranged between the direct-current excitation winding and the outer tooth portion, a second insulator is arranged in the auxiliary groove, a fourth insulator is arranged between the direct-current excitation winding and the stator armature winding, and a third insulator is arranged between the stator armature winding and the inner tooth portion.
The second insulator is air or insulating paper.
The first insulator, the third insulator and the fourth insulator are all made of insulating paper.
The outer tooth part and the inner tooth part are approximately in sector shapes, the edges of the outer tooth part and the inner tooth part, which are far away from the center of the rotor, are arcs with the circle centers at the center of the rotor, the edges of the outer tooth part and the inner tooth part, which are close to the center of the rotor, are linear edges or arcs which approximately point to the center of the rotor, the other two edges of each outer tooth part are linear edges, and smooth chamfers are arranged at the top points to avoid scratching winding.
The rotor adopts a double-disc structure with soft magnetic poles on the inner and outer circumferences, the soft magnetic poles are pasted at the positions, corresponding to the outer tooth parts of the stator iron core, of the surface of the rotor yoke close to the stator side, the permanent magnets and the soft magnetic poles which are in mutual contact are pasted at the positions, opposite to the inner tooth parts, of the surface of the rotor yoke close to the stator side, and the positions, corresponding to the auxiliary slots of the stator iron core, of the rotor yoke are magnetic isolation areas.
The permanent magnet is arranged between the first soft magnetic pole and the second soft magnetic pole and is distributed in a polarity alternating mode in the circumferential direction, the first soft magnetic pole and the second soft magnetic pole are made of ferromagnetic materials, and the number of the first soft magnetic pole, the number of the second soft magnetic pole and the number of the permanent magnets are equal to the number of poles of the motor.
A method for manufacturing an amorphous alloy stator core of a composite amorphous alloy axial flux motor is characterized in that:
selecting the width of an amorphous alloy strip according to the required axial size of a stator core, winding the amorphous alloy strip on a die with the size of the inner diameter according to the inner diameter and the outer diameter of the stator core, subtracting the thickness of the inner diameter from the outer diameter, laminating, compacting, annealing, dipping paint, shaping and curing, cutting radial slots on the left end face and the right end face of the stator core by adopting laser cutting, electric spark cutting or water jet cutting after curing is completed, forming a stator tooth part, and cutting the stator tooth part again along the circumference to generate an auxiliary slot, thereby forming the stator core with an inner circumferential tooth part and an outer circumferential tooth part.
Advantages and effects
The invention relates to a composite amorphous alloy axial flux motor, which has the following advantages and beneficial effects:
(1) the structure that the stator core tooth part is divided into the inner layer and the outer layer and the direct-current excitation winding is sleeved on the outer layer stator core tooth part is beneficial to changing the size of an air gap magnetic field by adjusting the size of the excitation current on the direct-current excitation winding.
(2) The magnetic flux generated by the direct-current excitation winding for controlling the magnetic field forms a loop through the soft magnetic poles, the air gaps, the rotor yoke parts, the stator core tooth parts and the stator core yoke parts, so that the control of the magnetic field can be conveniently realized without generating demagnetization harm on the permanent magnet, and the running reliability of the motor is improved.
(3) The permanent magnet and the soft magnetic pole are connected at the position of the inner surface of the rotor, which is opposite to the inner tooth part of the amorphous alloy stator core, when the motor operates in a flux weakening and speed expanding stage, the demagnetizing current on the armature winding can enable the soft magnetic pole connected with the permanent magnet to generate a reverse magnetic field, and the magnetic field can be weakened to a greater extent so that the amorphous alloy stator core has wider operation rotating speed.
(4) The structure of the rotor inner surface provided by the invention has the advantages that the soft magnetic pole is arranged on the outer layer, and the permanent magnet and the soft magnetic pole which are connected are arranged on the inner layer, the space proportion occupied by the permanent magnet and the soft magnetic pole can be reasonably arranged according to the actual working requirement, the required air gap magnetic field intensity and the motor rotating speed range can be adjusted on the basis of ensuring the basic power of the motor, and meanwhile, the combination of the combined action of the permanent magnet and the soft magnetic pole is adopted, so that the reduction of the using amount of the permanent magnet is facilitated, and the production and manufacturing cost of the motor is.
(5) Compared with the traditional silicon steel sheet, the iron loss of the motor is obviously lower under high frequency, so that the motor is particularly suitable for high-frequency and high-speed occasions.
Drawings
FIG. 1 is a schematic structural diagram of a composite amorphous alloy axial flux motor;
FIG. 2 is a schematic structural diagram of a composite amorphous alloy axial flux motor rotor;
FIG. 3 is a schematic diagram of a stator slot type and tooth structure of a composite amorphous alloy axial flux motor;
FIG. 4 is a schematic view of the windings and insulation on a single stator tooth;
fig. 5 stator outer tooth winding and insulation schematic.
Description of reference numerals:
1. the magnetic field generator comprises a rotor yoke, 2. a second soft magnetic pole, 3. a magnetic isolation area, 4. a permanent magnet, 5. a first soft magnetic pole, 6. a stator yoke, 7. an armature winding, 8. a direct current excitation winding, 9. an outer tooth part, 10. an inner tooth part, 11. a stator tooth part, 12. a rotor bracket, 13. an auxiliary groove, 14. a radial groove, 15. a first insulator, 16. a second insulator, 17. a fourth insulator, 18. a third insulator.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a composite amorphous alloy axial flux motor includes a stator, a casing, an end cover, a rotating shaft, a bearing and a rotor, and is characterized in that: the stator core is an amorphous alloy stator core, the stator core comprises two parts of a stator yoke part 6 and a stator tooth part 11, the stator tooth part 11 is composed of an inner tooth part 10 and an outer tooth part 9, the inner tooth parts 10 and the outer tooth parts 9 are circumferentially and uniformly distributed on the stator yoke part 6, an inner tooth part 10 is arranged on the inner side of each outer tooth part 9, the stator core is embedded in a machine shell, a direct-current excitation winding 8 is wound on the outer tooth part 9, a first insulator 15 is arranged between the direct-current excitation winding 8 and the outer tooth part 9, an armature winding 7 is further wound on the inner tooth part 10 of each outer tooth part 9 and the inner side of each outer tooth part 9 integrally, a fourth insulator 17 is arranged between the armature winding 7 and the direct-current excitation winding 8 inside the armature winding 7, and the structure of the stator tooth part blocks is beneficial to reducing loss on the stator core and improving performance of. The stator tooth part 11 is located the both sides of stator yoke part 6, stator core both sides all are equipped with the rotor, the rotor assembles in the pivot, the rotor includes rotor yoke 1, rotor support 12, second soft magnetic pole 2, permanent magnet 4 and first soft magnetic pole 5 circumference are evenly installed in rotor yoke 1 one side near the stator, every second soft magnetic pole 2's inboard all has a permanent magnet 4, every permanent magnet 4's inboard all has a first soft magnetic pole 5, permanent magnet 4 and first soft magnetic pole 5 contact each other, permanent magnet 4 and first soft magnetic pole 5 are corresponding with the circumferential direction position of internal tooth portion 10, second soft magnetic pole 2 is corresponding with the circumferential direction position of external tooth portion 9, second soft magnetic pole 2 is separated through magnetic isolation district 3 with its circumferential inboard permanent magnet 4, magnetic isolation district 3 is the air. The rotor yoke 1 is made of soft magnetic materials, the magnetic poles of the permanent magnets 4 of the rotors on the two sides are opposite and have different polarities, so that the axial flux motor with the single-stator double-rotor structure is formed, the armature windings 7 and the direct current excitation windings 8 are annularly arranged on a radial plane and have non-overlapping performance, and the two sets of the armature windings 7 and the direct current excitation windings 8 are completely symmetrical in the axial direction. The permanent magnet 4, the first soft magnetic pole 5 and the second soft magnetic pole 2 are respectively stuck on the surfaces of the rotor yokes 1 of the rotors at two sides close to the stator. However, the fixing method of the permanent magnet 4, the first soft magnetic pole 5 and the second soft magnetic pole 2 is not limited to gluing, and holes may be punched in the magnetic poles and connected by bolts, or two connection methods may be adopted. Two ends of the shell are respectively provided with an end cover, and a rotating shaft of the motor is supported in the center of the end cover through a bearing.
The stator core is formed by winding an amorphous alloy strip, a tooth part of the stator core is divided into an inner tooth part 10 and an outer tooth part 9, an auxiliary groove 13 is arranged between the inner tooth part 10 and the outer tooth part 9, the auxiliary groove 13 corresponds to the circumferential position of the magnetism isolating area 3 of the rotor, a radial groove 14 is formed between the tooth parts of the adjacent stator cores, the direct current excitation winding 8 is wound on the outer tooth part 9 through the radial groove 14 and the auxiliary groove 13, and the direct current excitation winding 8 is not in contact with the adjacent outer tooth part 9 and the inner tooth part 10. The stator armature windings 7 are wound on each stator tooth part 11 consisting of an internal tooth part 9 and an external tooth part 10, and a structure that the amorphous alloy stator core tooth part 11 is sleeved with two types of windings is formed. The dc field winding 8 is located on the outer periphery of the external tooth portion 9, three sides of the dc field winding are surrounded by the stator armature winding 7, a first insulator 15 is provided between the dc field winding 8 and the external tooth portion 9, a second insulator 16 is provided in the auxiliary groove for isolating the dc field winding 8 from the internal tooth portion 10, a fourth insulator 17 is provided between the dc field winding 8 and the stator armature winding 7, and a third insulator 18 is provided between the stator armature winding 7 and the internal tooth portion 10. The second insulator 16 is air or insulating paper. Preferably, air is selected as the insulating medium of the second insulator 16 for cost reduction while satisfying safety reliability. The first insulator 15, the third insulator 18, and the fourth insulator 17 are all made of insulating paper, and the materials thereof are the same. The external tooth part 9 and the internal tooth part 10 are approximately sector-shaped, the edges of the external tooth part and the internal tooth part which are respectively far away from the center of the rotor are circular arcs with the centers of the circles at the center of the rotor, the edges of the internal tooth part and the internal tooth part which are respectively close to the center of the rotor are linear edges or circular arcs which are approximately directed to the center of the rotor, the other two edges are respectively linear edges, and smooth chamfers are arranged at the vertexes to avoid scratching winding. The rotor adopts a double-disc structure with soft magnetic poles on the inner and outer circumferences, the soft magnetic poles 2 are attached to the positions, corresponding to the outer tooth parts 9 of the stator core, of the surface of the rotor yoke 1 close to the stator side, the permanent magnets 4 and the soft magnetic poles 5 which are in mutual contact are attached to the positions, corresponding to the inner tooth parts 10, of the surface of the rotor yoke 1 close to the stator side, and the magnetic isolation regions 3 are arranged at the positions, corresponding to the stator core auxiliary grooves 13, of the surface of the rotor yoke 1 close to the stator side. The permanent magnet 4 is arranged between the first soft magnetic pole 5 and the second soft magnetic pole 2 and is distributed in a polarity alternating mode in the circumferential direction, the first soft magnetic pole 5 and the second soft magnetic pole 2 are made of ferromagnetic materials, and the number of the first soft magnetic pole 5, the number of the second soft magnetic pole 2 and the number of the permanent magnet 4 are equal to the number of poles of the motor. The structure is favorable for reducing eddy current loss on the permanent magnet, simultaneously is favorable for saving the using amount of the permanent magnet, reducing the cost and improving the performance of the motor.
The manufacturing method of the amorphous alloy stator core of the composite amorphous alloy axial flux motor comprises the following steps:
selecting the width of an amorphous alloy strip according to the required axial size of a stator core, winding the amorphous alloy strip on a die with the size of the inner diameter according to the inner diameter and the outer diameter of the stator core, subtracting the thickness of the inner diameter from the outer diameter, laminating, compacting, annealing, dipping paint, shaping and curing, cutting radial slots on the left end face and the right end face of the stator core by adopting laser cutting, electric spark cutting or water jet cutting after curing is completed, forming a stator tooth part, and cutting the stator tooth part again along the circumference to generate an auxiliary slot, thereby forming the stator core with an inner circumferential tooth part and an outer circumferential tooth part.
The working process of the invention is as follows:
the stator is formed by winding an amorphous alloy strip, then the left part and the right part of the stator core are respectively grooved, after the grooving is finished, an auxiliary groove is further formed in the tooth parts of the stator core on the left side and the right side along the circumferential direction, each stator tooth is divided into two parts, then a soft magnetic pole is placed at the position of a rotor corresponding to the outer circular stator tooth, a permanent magnet and a soft magnetic pole are placed at the position of the rotor corresponding to the inner circular stator tooth, a direct current excitation winding is wound on the outer circumferential tooth part of the stator core, and an armature winding is wound on the whole stator tooth part. The armature winding is respectively electrified with three-phase sinusoidal alternating current, the direct current excitation winding is electrified with direct current, then the soft magnetic poles at the corresponding positions of the rotor are magnetized, so that the soft magnetic poles on the rotor and the permanent magnets act together to generate a synthetic magnetic field, the magnetic field is closed through the amorphous alloy stator core, and under the action of the electromagnetic field, the motor rotor rotates under the support of the bearing to output mechanical energy. The invention provides a composite amorphous alloy axial flux motor structure, which can change an air gap magnetic field by adjusting the size of exciting current so as to improve the rotating speed and the driving performance of the motor.
And (4) conclusion: the composite amorphous alloy axial flux motor not only inherits the characteristics of large power density, large torque density, high efficiency and the like of an axial flux permanent magnet motor, but also has the advantages of smoothness and adjustability of an air gap magnetic field of an electro-magnetic motor and the like.
Claims (10)
1. The utility model provides a compound metallic glass axial flux motor, includes stator, casing, end cover, pivot, bearing and rotor, its characterized in that: the stator core is an amorphous alloy stator core, the stator core comprises two parts of a stator yoke part and a stator tooth part, the stator tooth part consists of an inner tooth part and a plurality of outer tooth parts, the inner tooth parts and the outer tooth parts are circumferentially and uniformly distributed on the stator yoke part, the inner side of each outer tooth part is provided with an inner tooth part, the stator core is embedded into a machine shell, a direct-current excitation winding is wound on the outer tooth parts, a first insulator is arranged between the direct-current excitation winding and the outer tooth parts, the whole of each outer tooth part and the inner tooth parts on the inner side of the outer tooth parts are also wound with an armature winding, a fourth insulator is arranged between the armature winding and the direct-current excitation winding in the armature winding, the rotor is assembled on a rotating shaft, the rotor comprises a rotor yoke, a rotor bracket, a second soft magnetic pole, a permanent magnet and a first soft magnetic pole, the second soft magnetic pole, the permanent magnet and the, the inner side of each second soft magnetic pole is provided with a permanent magnet, the inner side of each permanent magnet is provided with a first soft magnetic pole, the permanent magnet is in contact with the first soft magnetic pole, the permanent magnet and the first soft magnetic pole correspond to the circumferential position of the inner tooth part, the second soft magnetic pole corresponds to the circumferential position of the outer tooth part, the second soft magnetic pole is isolated from the permanent magnet on the inner circumferential side of the second soft magnetic pole through a magnetic isolation area, two ends of the shell are respectively provided with an end cover, and a rotating shaft of the motor is supported in the center of the end cover through a bearing.
2. The compound amorphous alloy axial flux motor of claim 1, wherein: the stator tooth parts are positioned on two sides of the stator yoke part, the rotors are arranged on two sides of the stator core, the rotor yoke is made of soft magnetic materials, the magnetic poles of the permanent magnets of the rotors on the two sides are opposite and have different polarities, the axial flux motor with the single-stator double-rotor structure is formed, the armature windings and the direct current excitation windings are arranged in an annular mode on a radial plane and have non-overlapping performance, and the two sets of armature windings and the two sets of direct current excitation windings are completely symmetrical in the axial direction.
3. The compound amorphous alloy axial flux motor of claim 1, wherein: the stator core is formed by winding an amorphous alloy strip, a tooth part of the stator core is divided into an inner tooth part and an outer tooth part, an auxiliary groove is formed between the inner tooth part and the outer tooth part, the auxiliary groove corresponds to the circumferential position of a magnetism isolating area of the rotor, a radial groove is formed between the tooth parts of the adjacent stator cores, a direct current excitation winding is wound on the outer tooth part through the radial groove and the auxiliary groove, and the direct current excitation winding is not in contact with the inner sides of the adjacent outer tooth part and the inner tooth part.
4. The compound amorphous alloy axial flux motor of claim 1, wherein: the direct-current excitation winding is located on the outer periphery of the outer tooth portion, three sides of the direct-current excitation winding are surrounded by the armature winding, a first insulator is arranged between the direct-current excitation winding and the outer tooth portion, a second insulator is arranged in the auxiliary groove, a fourth insulator is arranged between the direct-current excitation winding and the armature winding, and a third insulator is arranged between the armature winding and the inner tooth portion.
5. The compound amorphous alloy axial flux motor of claim 4, wherein: the second insulator is air or insulating paper.
6. The compound amorphous alloy axial flux motor of claim 4, wherein: the first insulator, the third insulator and the fourth insulator are all made of insulating paper.
7. The compound amorphous alloy axial flux motor of claim 4, wherein: the outer tooth part and the inner tooth part are in sector shapes, the edges of the outer tooth part and the inner tooth part, which are far away from the center of the rotor, are arcs with the circle centers at the center of the rotor, the edges of the inner tooth part and the outer tooth part, which are close to the center of the rotor, are linear edges or arcs approximately pointing to the center of the rotor, the other two edges of the inner tooth part and the outer tooth part are linear edges, and smooth chamfers are arranged at the top points.
8. The compound amorphous alloy axial flux motor of claim 1, wherein: the rotor adopts a double-disc structure with soft magnetic poles on the inner and outer circumferences, a second soft magnetic pole is pasted on the surface of the rotor yoke close to the stator side and at the position corresponding to the outer tooth part of the stator iron core, a permanent magnet and a first soft magnetic pole which are in mutual contact are pasted on the surface of the rotor yoke close to the stator side and at the position corresponding to the inner tooth part, and a magnetic isolation area is arranged on the surface of the rotor yoke close to the stator side and at the position corresponding to the stator iron core auxiliary groove.
9. The compound amorphous alloy axial flux motor of claim 1, wherein: the permanent magnet is arranged between the first soft magnetic pole and the second soft magnetic pole and is distributed in a polarity alternating mode in the circumferential direction, the first soft magnetic pole and the second soft magnetic pole are made of ferromagnetic materials, and the number of the first soft magnetic pole, the number of the second soft magnetic pole and the number of the permanent magnets are equal to the number of poles of the motor.
10. A method for manufacturing an amorphous alloy stator core of a compound amorphous alloy axial flux motor according to claim 1, wherein:
selecting the width of an amorphous alloy strip according to the required axial size of a stator core, winding the amorphous alloy strip on a die with the size of the inner diameter according to the inner diameter and the outer diameter of the stator core, subtracting the thickness of the inner diameter from the outer diameter, laminating, compacting, annealing, dipping paint, shaping and curing, cutting radial slots on the left end face and the right end face of the stator core by adopting laser cutting, electric spark cutting or water jet cutting after curing is completed, forming a stator tooth part, and cutting the stator tooth part again along the circumference to generate an auxiliary slot, thereby forming the stator core with an inner circumferential tooth part and an outer circumferential tooth part.
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| EP4170869A1 (en) * | 2021-10-19 | 2023-04-26 | Honeywell International Inc. | High temperature and high power density axial flux motor |
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| EP4170869A1 (en) * | 2021-10-19 | 2023-04-26 | Honeywell International Inc. | High temperature and high power density axial flux motor |
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