CN114825725B - Low-cost axial permanent magnet motor and control system thereof - Google Patents
Low-cost axial permanent magnet motor and control system thereof Download PDFInfo
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- CN114825725B CN114825725B CN202210535717.0A CN202210535717A CN114825725B CN 114825725 B CN114825725 B CN 114825725B CN 202210535717 A CN202210535717 A CN 202210535717A CN 114825725 B CN114825725 B CN 114825725B
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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
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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
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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
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2788—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K47/00—Dynamo-electric converters
- H02K47/02—AC/DC converters or vice versa
- H02K47/04—Motor/generators
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Abstract
The application provides a low-cost axial permanent magnet motor and control system thereof relates to motor technical field, and this permanent magnet motor includes: the rotating shaft, two rotors arranged on the rotating shaft and a stator positioned between the two rotors; the rotor comprises an end disc, a permanent magnet and a magnetic resistance, wherein the permanent magnet and the magnetic resistance have the same structure and size and are symmetrically arranged on the surface of the end disc to form a surface-mounted rotor; the magnetic poles of two adjacent permanent magnets are opposite and symmetrical about the center of the rotating shaft. The structure replaces the traditional N-S symmetrical arrangement mode of magnetic poles, replaces permanent magnets with magnetic resistance, reduces cost, is similar and symmetrical on a magnetic circuit, fully utilizes magnetic resistance torque generated by the magnetic resistance, remarkably improves torque density under the condition of unit permanent magnet consumption, and ensures that the maximum values of the permanent magnet torque and the magnetic resistance rotor of the motor can be overlapped at the same current phase angle by the magnetic resistance and the mirror image phase of the permanent magnet, thereby realizing the overlapped utilization of the permanent magnet torque and the magnetic resistance torque, and improving the torque density of the motor.
Description
Technical Field
The application belongs to the technical field of motors, and particularly relates to a low-cost axial permanent magnet motor and a control system thereof.
Background
The statements in this section merely provide background information related to the present application and may not necessarily constitute prior art.
In recent years, with the wide application of rare earth permanent magnet materials in motors, electromagnets in electrically excited synchronous motors have been gradually replaced with permanent magnet materials. Compared with the traditional induction motor, the permanent magnet synchronous motor has the advantages of small volume, light weight, high power density, high torque density, high power factor, high efficiency and the like.
As one of permanent magnet motors, an axial permanent magnet motor is also called a disc type permanent magnet motor, and is getting more attention due to the advantages of compact structure, high efficiency, high power density and the like. In recent years, the topology of axial permanent magnet motors has been widely studied to increase torque density, with most of the research focused on five parts: stator/rotor combination, rotor core, PM arrangement, stator core and coil layout. Compared with a radial flux motor, the axial flux motor has higher diameter-to-length ratio (compactness) and torque-to-weight ratio (torque density), so that the axial flux motor has wide application prospect. However, axial field permanent magnet synchronous motors have not been developed effectively due to limitations in motor manufacturing processes, permanent magnet material properties, winding configuration techniques, drive capacity, and the like.
Disclosure of Invention
In order to solve the problems, the application provides a low-cost axial permanent magnet motor and a control system thereof, which have lower cost and higher torque density and operation efficiency, thereby being suitable for operation conditions.
In order to achieve the above purpose, the technical scheme adopted in the application is as follows:
in a first aspect, embodiments of the present application provide a low cost axial permanent magnet motor comprising: the rotating shaft, two rotors arranged on the rotating shaft and a stator positioned between the two rotors; the rotor comprises an end disc, a permanent magnet and a magnetic resistance, wherein the permanent magnet and the magnetic resistance have the same structure and size and are symmetrically arranged on the surface of the end disc to form a surface-mounted rotor; the magnetic poles of two adjacent permanent magnets are opposite and symmetrical about the center of the rotating shaft.
As an optional implementation manner, the permanent magnet is of a double-sine structure, is formed by cutting double-sine unequal amplitude values, and has a reluctance corresponding to the permanent magnet in structure;
alternatively, the magnetic resistance is made of the same or nearly the same material as the permanent magnet density.
As an alternative embodiment, the stator includes a stator core and a stator winding, the stator winding is a two-phase winding, and is uniformly wound along a vertical direction of a circumference of the stator core.
As an alternative embodiment, the stator core is a hollow core in the shape of a circular sleeve, and does not include stator teeth or their corresponding slots.
As an alternative embodiment, the stator core is formed by axially laminating soft magnetic composite materials.
As an alternative embodiment, a plurality of flat coils are spatially oriented around the stator, with four concentrated windings corresponding to the two-phase windings and surrounding the stator core.
As an alternative embodiment, the two-phase windings are symmetrically arranged in 180 degrees in space, and one phase of the electromagnetic phase leads the other phase by 90 degrees, so as to form the electromagnetic phase relation of the motor.
As an alternative embodiment, the rotor further comprises a rotor sheath, wherein the rotor sheath is tightly attached to the surface of the end disk and is tightly contacted with the permanent magnet and the magnetic resistance, and the outer diameter of the rotor sheath is the same as that of the end disk.
As an alternative embodiment, the rotor comprises an N-pole permanent magnet reluctance auxiliary rotor and an S-pole permanent magnet reluctance auxiliary rotor; the length of the air gap between the N-pole permanent magnet reluctance auxiliary rotor and the stator is equal to that of the air gap between the S-pole permanent magnet reluctance auxiliary rotor and the stator.
In a second aspect, an embodiment of the present application further provides a control system for a low-cost axial permanent magnet motor, including the low-cost axial permanent magnet motor according to any one of the first aspect and the optional implementation manners of the first aspect, and a two-phase connection controller, where the two-phase connection controller is used for implementing ac/dc conversion of electromechanical energy, controlling a stator winding of the low-cost axial permanent magnet motor, and the two-phase connection controller is a two-phase six-switch bridge circuit.
The beneficial effects of this application are:
(1) The low-cost axial permanent magnet motor provided by the application has the advantages that the structure replaces a traditional N-S symmetrical arrangement mode of magnetic poles, the permanent magnets are replaced by magnetic resistance, the cost is reduced, the magnetic circuit is similar and symmetrical, the magnetic resistance torque generated by the magnetic resistance is fully utilized, the torque density is obviously improved under the unit permanent magnet dosage, the magnetic resistance and the permanent magnet mirror image correspond to each other, the motor permanent magnet torque and the maximum value of the magnetic resistance rotor can be overlapped at the same current phase angle, the overlapped utilization of the permanent magnet torque and the magnetic resistance torque is realized, and the torque density of the motor is improved.
(2) The permanent magnet and the magnetic resistance of the axial permanent magnet motor are optimally designed based on sinusoidal curves, the permanent magnet adopts a double-sinusoidal structure, an outer sinusoidal curve is defined as Asinθ, an inner sinusoidal curve is defined as Bsin θ, and the magnetic pole area is as follows:the double-sinusoidal unequal amplitude cutting is adopted to cut the magnetic force lines of the magnetic poles of the lead wire, the effective area of the magnetic force lines of the magnetic poles of the lead wire is changed in a sinusoidal way all the time, the sinusoidization of magnetic links and counter electromotive force is realized, the sinusoidal air gap field is distributed, so that the eddy current loss is reduced, the air gap field harmonic wave is reduced, the torque pulsation and vibration noise are reduced, and the operation efficiency is improved. Correspondingly, the magnetic resistance corresponds to the permanent magnet in structure, so that the axial magnetic pulling force and the net axial force can be reduced, and the magnetic resistance uses materials similar to the density of the permanent magnet, so that the running moment of inertia of the rotor can be balanced, and the radial force is reduced.
The double sine structure permanent magnet-magnetic resistance structure is designed for convenient processing, the cost is reduced, the permanent magnet corresponds to the magnetic resistance, the formed rotor magnetic circuit is similar and symmetrical, the magnetic resistance rotor is introduced to relatively reduce the motor torque pulsation, and the torque which can be output by the permanent magnet in unit volume is improved.
(3) The stator winding of the axial flux permanent magnet motor adopts two-phase windings, the two-phase windings are wound in a concentrated way, and flat copper wires with rectangular cross sections are adopted, so that the effective area of a conducting wire and an air gap is increased, the end winding is short, copper loss is low, the structure is simple, and air gap magnetic field modulation is simpler and more ideal.
(4) The stator winding of the axial flux permanent magnet motor is controlled by adopting a two-phase connection controller, the switches controlled by the three-phase winding connection are required to be controlled simultaneously and cooperatively, and the third phase independent switch shared by the two-phase connection controller windings can be controlled independently and is not interfered by the front two-phase switch. Under the condition that the resistance of the lead wires of the whole winding is unchanged, each phase in the three-phase winding is distributed with rated current I, and the two-phase winding corresponds to each phaseThe rated current of 1.5I is distributed, and the concentrated windings of three phases and two phases generate the same average torque. In addition, the switching tube operation power requirement of the three-phase six-switch bridge is as follows:and the switching tube power requirement of the two-phase six-switch bridge: />Two-phase controllers are less demanding on power devices.
(5) The stator of the axial permanent magnet motor adopts a hollow stator, so that the use of stator materials is reduced, and meanwhile, the cogging torque can be eliminated, the axial magnetic force is reduced, and the stator core loss is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic exploded view of a low cost axial permanent magnet motor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a stator structure and winding phase distribution provided in an embodiment of the present application;
FIG. 3 is a schematic illustration of a cross-section of a stator 1/2 provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of a stator control circuit topology provided by an embodiment of the present application;
FIG. 5 is a schematic structural diagram of an N-pole permanent magnet reluctance auxiliary rotor according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an S-pole permanent magnet reluctance auxiliary rotor according to an embodiment of the present application.
Reference numerals: 1. s-pole permanent magnet reluctance auxiliary rotor; 1-1, S pole double sine structure permanent magnet; 1-2, S pole double sine structure magnetic resistance; 1-3, S pole permanent magnet reluctance auxiliary rotor end disk; 1-4, S pole permanent magnet reluctance auxiliary rotor sheath; 2. an N-pole permanent magnet reluctance auxiliary rotor; 2-1, N pole double sine structure permanent magnet; 2-2, N pole double sine structure magnetic resistance; 2-3, N pole permanent magnet reluctance auxiliary rotor end plates; 2-4, N pole permanent magnet reluctance auxiliary rotor sheath; 3. a stator; 3-1, a stator core; 3-2, stator windings; 4. a rotating shaft.
Detailed Description
The present application is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Based on the above, the axial permanent magnet motor with low cost is low in cost, has high operation efficiency and torque density and is suitable for various operation conditions.
Referring to fig. 1, fig. 1 is a schematic exploded view of a low-cost axial permanent magnet motor according to an embodiment of the present invention, as shown in fig. 1, the low-cost axial permanent magnet motor includes: a rotating shaft 4, two rotors arranged on the rotating shaft 4 and a stator 3 positioned between the two rotors; the rotor comprises an end disc, a permanent magnet and a magnetic resistance, wherein the permanent magnet and the magnetic resistance have the same structure and size and are symmetrically arranged on the surface of the end disc to form a surface-mounted rotor; the magnetic poles of two adjacent permanent magnets are opposite and symmetrical about the center of the rotating shaft.
In a specific implementation, the two rotors are an S-pole permanent magnet reluctance auxiliary rotor 1 and an N-pole permanent magnet reluctance auxiliary rotor 2, respectively, and the stator 3 is located between the S-pole permanent magnet reluctance auxiliary rotor 1 and the N-pole permanent magnet reluctance auxiliary rotor 2. The rotor is of an axial double-layer structure and comprises a rotating shaft 4, rotor end plates 1-3 and 2-3 fixed on the rotating shaft, and the permanent magnets and the magnetic resistance have the same structure and size and are symmetrically arranged on the surfaces of the end plates to form a surface-mounted rotor; the magnetic poles of two adjacent permanent magnets are opposite and symmetrical about the center of the rotating shaft.
According to the motor, the permanent magnet is replaced by the magnetic resistance, the cost is reduced, meanwhile, the magnetic paths are similar and symmetrical, the magnetic resistance torque generated by the magnetic resistance is fully utilized, the torque density is remarkably improved under the unit permanent magnet consumption, the maximum values of the permanent magnet torque and the magnetic resistance rotor of the motor can be overlapped at the same current phase angle by the corresponding magnetic resistance and the mirror image of the permanent magnet, the overlapped utilization of the permanent magnet torque and the magnetic resistance torque is realized, and the torque density of the motor is improved.
In this embodiment of the present application, as an optional embodiment, the permanent magnet has a double sinusoidal structure, and the magnetic resistance corresponds to the permanent magnet in structure;
alternatively, the magnetic resistance is made of the same or nearly the same material as the permanent magnet density.
In specific implementation, the permanent magnet adopts a double-sinusoidal structure, an outer sinusoidal curve is defined as Asinθ, an inner sinusoidal curve is defined as Bsin θ, and the magnetic pole area is as follows:the magnetic resistance corresponds to the permanent magnet in structure and is formed by cutting double sine unequal amplitude values, the effective area of magnetic force lines of the magnetic poles cut by the lead is changed in a sine way all the time, the sine of magnetic linkage and counter electromotive force is realized, the sine air gap field is distributed so as to reduce eddy current loss, reduce air gap field harmonic waves, reduce torque pulsation and vibration noise, and improve the operation efficiency. As shown in fig. 2 and 3, the S-pole double sinusoidal structure permanent magnet 1-1, the S-pole double sinusoidal structure magnetic resistance 1-2, the N-pole double sinusoidal structure permanent magnet 2-1 and the N-pole double sinusoidal structure magnetic resistance 2-2 are in sinusoidal design based on double sinusoidal structures, and are tightly attached to the surfaces of the corresponding S-pole permanent magnet magnetic resistance auxiliary rotor end disk 1-3 and the corresponding N-pole permanent magnet magnetic resistance auxiliary rotor end disk 2-3, the S-pole double sinusoidal structure permanent magnet 1-1 is in mirror symmetry with respect to the N-pole double sinusoidal structure magnetic resistance 2-2, and the N-pole double sinusoidal structure permanent magnet 2-1 is in mirror symmetry with respect to the S-pole double sinusoidal structure magnetic resistance 1-2.
In this embodiment, as an optional embodiment, the stator includes a stator core and a stator winding, where the stator winding is a two-phase winding and is uniformly wound along a vertical direction of a circumference of the stator core; optionally, the stator core is a hollow core in a shape of a circular sleeve, and does not include stator teeth or corresponding slots thereof. Optionally, the stator core is formed by axially laminating soft magnetic composite materials; alternatively, as an alternative embodiment, a plurality of flat coils are spatially oriented around the stator, with four concentrated windings corresponding to two-phase windings and surrounding the stator core.
In a specific implementation, as shown in fig. 4 and 5, the stator 3 includes a hollow stator core 3-1 and a stator two-phase winding 3-2, and the stator core 3-1 adopts a slotless stator structure and is formed by axially laminating soft magnetic composite materials. The stator winding 3-2 is a two-phase winding, and is uniformly wound around the stator core 3-1 in a direction perpendicular to the circumference of the stator core 3-1 using a flat winding wire. In the figure "+" represents the incoming line direction of each phase winding, "-" represents the outgoing line direction of each phase winding, and A, B represents two phases of the stator winding 3-2, respectively, each phase being separated by a mechanical angle of 90 °. The distribution pattern within each phase of the stator windings 3-2 may vary, and the distribution of each phase windings is used herein for illustration only.
Here, the stator core is a hollow core in the shape of a circular sleeve, does not contain stator teeth or corresponding slots thereof, namely a slotless stator structure, and can eliminate cogging torque, thereby effectively reducing vibration noise; the stator winding adopts two-phase windings, the two-phase windings are wound in a concentrated way, and the effective area of a wire and an air gap can be increased by adopting flat copper wires with rectangular cross sections, so that the air gap magnetic field modulation is more ideal. The stator winding adopts flat winding to enable the end part to be smaller, is easy to manufacture and wind, has good heat radiation performance, and in addition, has higher rigidity, reduces the vibration noise of the motor winding, thereby improving the overall performance of the motor. Alternatively, the two-phase windings are spatially symmetrically arranged at 180 degrees to form an electromagnetic phase relationship of the motor.
In this embodiment, as an optional embodiment, the rotor further includes a rotor sheath, where the rotor sheath is tightly attached to the surface of the end disc and is in close contact with the permanent magnet and the magnetic resistance, and the outer diameter of the rotor sheath is the same as that of the end disc.
In specific implementation, the S-pole double-sinusoidal structure permanent magnet 1-1, the S-pole double-sinusoidal structure magnetic resistance 1-2, the N-pole double-sinusoidal structure permanent magnet 2-1 and the N-pole double-sinusoidal structure magnetic resistance 2-2 are respectively fixed on the corresponding S-pole permanent magnet magnetic resistance auxiliary rotor sheath 1-4 and the N-pole permanent magnet magnetic resistance auxiliary rotor sheath 2-4 and are clung to the surfaces of the corresponding S-pole permanent magnet magnetic resistance auxiliary rotor end disc 1-3 and the N-pole permanent magnet magnetic resistance auxiliary rotor end disc 2-3, the S-pole double-sinusoidal structure permanent magnet 1-1 is in mirror symmetry with the N-pole double-sinusoidal structure magnetic resistance 2-2, and the N-pole double-sinusoidal structure permanent magnet 2-1 is in mirror symmetry with the S-pole double-sinusoidal structure magnetic resistance 1-2.
The rotor sheath is arranged on the residual space of the rotor surface except the permanent magnet with the optimized shape design, the structure is compact, and the effective air gap length of the motor is not influenced.
In this embodiment, as an optional embodiment, the rotor includes an N-pole permanent magnet reluctance auxiliary rotor and an S-pole permanent magnet reluctance auxiliary rotor; the length of the air gap between the N-pole permanent magnet reluctance auxiliary rotor and the stator is equal to that of the air gap between the S-pole permanent magnet reluctance auxiliary rotor and the stator.
The technical scheme has the advantages that the permanent magnet is formed by cutting double sine unequal amplitude values, the effective area of magnetic force lines of the magnetic poles cut by the lead is changed in a sinusoidal way all the time, the double sine structure realizes the sine of magnetic linkage and counter electromotive force, the harmonic wave of an air gap magnetic field is reduced, torque pulsation and vibration noise are reduced, and the operation efficiency is improved. The magnetic resistance double-sine structure design structurally corresponds to the double-sine structure permanent magnet, reduces axial magnetic pulling force and net axial force, balances running rotational inertia of the rotor by using materials similar to the density of the permanent magnet, and reduces radial force. The permanent magnet is replaced by magnetic resistance, the cost is reduced, the magnetic circuits are similar and symmetrical, the magnetic resistance torque generated by the magnetic resistance is fully utilized, the torque density is obviously improved under the condition of unit permanent magnet consumption, the maximum values of the permanent magnet torque and the magnetic resistance rotor of the motor can be overlapped at the same current phase angle by the magnetic resistance and the permanent magnet mirror image phase, and the overlapped utilization of the permanent magnet torque and the magnetic resistance torque is realized.
According to the embodiment of the application, the axial magnetic flux structure is adopted, so that the axial effective air gap length is adjustable, the axial effective air gap is not influenced by the permanent magnet sheath, the volume is compact, and the heat dissipation performance is excellent; the stator adopts a slotless hollow stator structure to eliminate cogging torque, reduce vibration noise and increase power density; the stator winding improves heat dissipation performance and efficiency by using a flat wire winding technology; the rotor permanent magnet and the magnetic resistance realize the sine of magnetic linkage and back electromotive force through shape optimization design, so that the motor has the advantages of low harmonic distortion, low vibration noise, high efficiency and the like.
The embodiment of the application also provides a control system of the low-cost axial permanent magnet motor, which comprises the low-cost axial permanent magnet motor and a two-phase connection controller, wherein the two-phase connection controller is used for realizing alternating current-direct current conversion of electromechanical energy and controlling a stator winding of the low-cost axial permanent magnet motor, and the two-phase connection controller is a two-phase six-switch bridge circuit.
In practice, an important advantage of the two-phase connection controller is that the requirements on the driving circuit are lower. The three-phase winding connection control switch needs to be controlled cooperatively at the same time, and the third phase independent switch shared by the two-phase connection controller windings can be controlled independently and is not interfered by the front two-phase switch. Under the condition that the resistance of the whole lead is unchanged, each phase in the three-phase winding is distributed with rated current I, each phase in the two-phase winding is distributed with rated current 1.5I, and the concentrated windings of the three phases and the two phases generate the same average torque. In addition, the switching tube operation power requirement of the three-phase six-switch bridge is as follows:and the switching tube power requirement of the two-phase six-switch bridge: />Two-phase controllers are less demanding on power devices. Here, the topology schematic diagram of the stator control circuit is shown in fig. 6, and the two-phase connection controller is a two-phase six-switch bridge circuit, which is used for implementing ac-dc conversion of electromechanical energy and controlling the stator winding of the low-cost axial permanent magnet motor.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (9)
1. A low cost axial permanent magnet machine comprising: the rotating shaft, two rotors arranged on the rotating shaft and a stator positioned between the two rotors; the two rotors comprise end discs, permanent magnets and magnetic resistances; the two rotors are respectively an S-pole permanent magnet reluctance auxiliary rotor and an N-pole permanent magnet reluctance auxiliary rotor; the end disc is fixed on the rotating shaft; the permanent magnet and the magnetic resistance have the same structure and size and are symmetrically arranged on the surface of the end disc to form a surface-mounted rotor;
the permanent magnet has a double sine structure, and defines an outer sine curve asThe inner sinusoid is +.>The magnetic pole area is: />The magnetic resistance is structurally corresponding to the permanent magnet and is formed by cutting double sine unequal amplitude values, and the magnetic resistance is made of materials with the same or nearly the same density as the permanent magnet;
the S-pole double-sinusoidal structure permanent magnet is in mirror symmetry with the N-pole double-sinusoidal structure magnetic resistance, and the N-pole double-sinusoidal structure permanent magnet is in mirror symmetry with the S-pole double-sinusoidal structure magnetic resistance;
the magnetic poles of the S-pole double-sinusoidal structure permanent magnet are opposite to the magnetic poles of the N-pole double-sinusoidal structure permanent magnet, and the two permanent magnets are symmetrical about the center of the rotating shaft.
2. The low cost axial permanent magnet machine of claim 1, wherein the stator includes a stator core and stator windings, the stator windings being two-phase windings uniformly wound in a perpendicular direction along a circumference of the stator core.
3. The low cost axial permanent magnet machine of claim 2, wherein the stator core is a hollow core of toroidal sleeve shape, not containing stator teeth or their corresponding slots.
4. A low cost axial permanent magnet machine according to claim 3, wherein the stator core is formed by axially laminating soft magnetic composite material.
5. The low cost axial permanent magnet machine of claim 2, wherein the plurality of flat coils are spatially oriented around the stator, and four concentrated windings correspond to two phase windings and surround the stator core.
6. The low cost axial permanent magnet machine of claim 2 wherein the two phase windings are spatially 180 degrees symmetrically arranged, one phase of the electromagnetic phase leading the other phase by 90 degrees, to form the electromagnetic phase relationship of the machine.
7. The low cost axial permanent magnet machine of claim 1 wherein the rotor further comprises a rotor jacket that is snugly against the surface of the end disk and is in intimate contact with the permanent magnet, reluctance, and has the same outer diameter as the end disk.
8. The low cost axial permanent magnet machine of claim 1 wherein the rotor comprises an N-pole permanent magnet reluctance assist rotor and an S-pole permanent magnet reluctance assist rotor; the length of the air gap between the N-pole permanent magnet reluctance auxiliary rotor and the stator is equal to that of the air gap between the S-pole permanent magnet reluctance auxiliary rotor and the stator.
9. A control system of a low-cost axial permanent magnet motor, comprising the low-cost axial permanent magnet motor according to any one of claims 1-8 and a two-phase connection controller, wherein the two-phase connection controller is used for realizing alternating current-direct current conversion of electromechanical energy and controlling a stator winding of the low-cost axial permanent magnet motor, and the two-phase connection controller is a two-phase six-switch bridge circuit.
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| CN202210535717.0A CN114825725B (en) | 2022-05-17 | 2022-05-17 | Low-cost axial permanent magnet motor and control system thereof |
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| CN202210535717.0A CN114825725B (en) | 2022-05-17 | 2022-05-17 | Low-cost axial permanent magnet motor and control system thereof |
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| JP2009011011A (en) * | 2007-06-26 | 2009-01-15 | Meidensha Corp | Rotor for permanent magnet reluctance motor |
| JP2013051771A (en) * | 2011-08-30 | 2013-03-14 | Daikin Ind Ltd | Rotor |
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| CN105610288B (en) * | 2016-01-26 | 2018-02-27 | 江苏大学 | A kind of permanent-magnet torque and reluctance torque divergence type motor and optimum efficiency control method |
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