CN114123698A - Method for establishing equivalent magnetic network model of hybrid excitation double-stator magnetic suspension switched reluctance motor - Google Patents

Method for establishing equivalent magnetic network model of hybrid excitation double-stator magnetic suspension switched reluctance motor Download PDF

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CN114123698A
CN114123698A CN202111257204.XA CN202111257204A CN114123698A CN 114123698 A CN114123698 A CN 114123698A CN 202111257204 A CN202111257204 A CN 202111257204A CN 114123698 A CN114123698 A CN 114123698A
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magnetic
stator
motor
rotor
network model
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项倩雯
张志友
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Jiangsu University
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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
    • H02K16/04—Machines with one rotor and two stators
    • 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
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Synchronous Machinery (AREA)

Abstract

The invention discloses a method for establishing an equivalent magnetic network model of a hybrid excitation double-stator magnetic suspension switched reluctance motor. And an integral dynamic equivalent magnetic network model of the motor is established, so that the accuracy and the modeling speed of the model are improved. Especially in the initial design stage of the motor, a large amount of time can be saved, and the design efficiency of the motor is improved. The invention analyzes the magnetic conductance of the torque air gap which changes all the time in the moving process of the rotor by adopting a segmentation method, divides the relative position of the outer stator and the rotor teeth into a plurality of regions for research, and solves the magnetic conductance of each region. The equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor established by the invention can predict the electromagnetic performance of the motor and reduce the early analysis time of the motor design.

Description

Method for establishing equivalent magnetic network model of hybrid excitation double-stator magnetic suspension switched reluctance motor
Technical Field
The invention relates to an equivalent magnetic network modeling method of a hybrid excitation double-stator magnetic suspension switched reluctance motor, belonging to the technical field of magnetic suspension motors.
Background
Since the 21 st century, the world economy has been continuously and rapidly developed, and particularly, the demand of high-speed motors in industrial fields, such as centrifuges, flywheel batteries, aerospace and the like, is urgent. However, the ultra-high speed operation of the motor causes severe wear of the mechanical bearing, and requires regular maintenance, especially in the process of generating heat by friction, high temperature is generated, and the working efficiency of the motor is not high. There is an urgent need to design high speed, high efficiency motors to meet the current economic development needs.
In recent years, the development of the magnetic suspension technology brings breakthrough to the research of high-speed motors, and the magnetic suspension technology is combined with the switched reluctance motor to further improve the critical rotating speed of the motor. Therefore, scholars at home and abroad respectively design different types of magnetic suspension switched reluctance motors. Particularly, the hybrid excitation double-stator magnetic suspension switched reluctance motor not only realizes the high-speed operation of the motor, but also solves the coupling problem between suspension and torque.
In order to fully exert the inherent advantages of the hybrid excitation double-stator magnetic suspension switched reluctance motor, the motor needs to be analyzed quickly and accurately. The current research on such motors is based on finite element analysis, and the other is conventional magnetic circuit analysis. With the development of computer technology, finite element analysis is widely applied to design and analysis of motors due to its high precision. Then, in the initial design stage of the motor, the design parameters need to be continuously modified, so that the finite element analysis method is time-consuming. In the other method, although the analysis speed of the motor is high, the accuracy is not high in the traditional magnetic circuit analysis method, and particularly for the analysis of some complex motors, the accuracy is much lower than that of a finite element. In terms of the development of the magnetic circuit method, the equivalent magnetic network method adopts the idea of finite element subdivision, has small calculated amount, can ensure certain precision, and can realize the rapid design of the motor.
Disclosure of Invention
The invention aims to provide an equivalent magnetic network modeling method of a hybrid excitation double-stator magnetic suspension switched reluctance motor, which mainly comprises the steps of segmenting magnetic lines of an air gap, equivalently calculating the magnetic conductance of teeth and yokes of a stator and a rotor and establishing and solving an equivalent magnetic network matrix equation.
In order to achieve the purpose, the invention adopts the technical scheme that: an equivalent magnetic network model building method for an 24/16/8-pole hybrid excitation double-stator magnetic suspension switched reluctance motor comprises the following steps:
step 1, dividing disordered and regular areas of magnetic force lines in a motor;
and 2, establishing magnetic conductance models of inner and outer stator teeth, rotor teeth and a yoke of the motor. The method comprises the following steps that a tooth part and a yoke part of a stator and a rotor of the motor are used as fixed magnetic conductance parts, the fixed magnetic conductance has two basic models, one is a rectangular model, the other is a sector model, and the magnetic conductance models of the fixed parts are connected into a fixed magnetic conductance network model;
step 3, dividing an air gap magnetic field between the outer stator teeth and the rotor teeth into flux tubes with regular shapes, calculating air gap permeance of each block, and then connecting the permeance of an air gap part in parallel to form an air gap permeance network model;
and 4, equivalent permanent magnets into a series combination of magnetomotive force and magnetic conductance.
And 5, combining the fixed magnetic permeability network model, the air gap magnetic permeability network model and the permanent magnet magnetic network model in series and parallel according to corresponding position relations to form an equivalent magnetic network model of the whole motor, and establishing a magnetic permeability matrix equation.
And 6, writing out a node magnetic potential equation of the whole motor equivalent magnetic network model, solving the equation, solving the magnetic potential of each node and the magnetic flux of the flux guide, and further solving each static characteristic of the motor.
Further, the 24/16/8-pole hybrid excitation double-stator magnetic suspension switched reluctance motor is divided into an outer stator, an inner stator, a rotor and an air gap; DW465-50 silicon steel sheets are adopted as the materials of the inner stator core, the outer stator core and the rotor core, and neodymium iron boron NdFe30 is adopted as the material of the permanent magnet. The outer stator of the motor is distributed with 24 teeth poles at equal intervals, wherein the windings of 8 teeth poles are connected in series to form one phase. The hybrid inner stator consists of 8 salient poles which are symmetrically distributed and 4 permanent magnets. The permanent magnet adopts a radial magnetizing mode to provide bias magnetic flux for the rotor, the magnetic poles are in NS alternating change and form an eight-pole magnetic field together with the control magnetic flux, and other 4 poles and the permanent magnet are distributed at intervals. The suspension current in the x direction controls the suspension force in the x direction, and the suspension current in the y direction controls the suspension force in the y direction.
Further, in the step 1, finite element software is adopted to simulate the motor to obtain a distribution map of magnetic lines of force inside the motor. The regions with regular magnetic force lines are mainly concentrated on the stator and rotor teeth and the yoke, and the regions with disorder are concentrated on the air gap part between the stator teeth and the rotor teeth outside the motor.
Further, in the step 2, the stator and rotor yoke is divided into corresponding parts according to the corresponding number of tooth poles, and the cross section of the yoke is similar to a sector, so that each yoke can equivalently form a flux guide; the sectional area of the stator and rotor teeth is rectangular, and the tooth part of each stator and rotor is equivalent to a magnetic conductance.
Furthermore, in step 3, since the outer stator and the rotor teeth of the motor are both salient pole structures, the air gap between the outer stator and the rotor teeth is not uniformly distributed, and when the permeance of the part is calculated, the region of the part is divided into a plurality of regular shapes, and the permeance values of the parts are calculated one by one, and then the permeance values of the whole air gap are obtained by connecting the permeances in series and in parallel.
Further, in the step 4, the permanent magnet has strong performance and the distribution rule of the internal magnetic force lines can be equivalent to the series combination of magnetomotive force and magnetic conductance.
Further, in the step 5, the flux-guide of each part and the connection mode of the flux-guide are determined, and a complete equivalent magnetic network model is established. The established magnetic network models are numbered, the calculation of the magnetic circuit is similar to the calculation of the circuit, the calculation of the magnetic circuit also meets kirchhoff voltage law and kirchhoff current law, and the calculation can be carried out by adopting a node magnetomotive method. And establishing a magnetic conductance matrix equation G & F which is phi, wherein G is a magnetic conductance matrix, and F and phi are node magnetic potential and a magnetic flux matrix.
Further in the step 6, the matrix equation is solved in MATLAB to obtain the magnitude of node magnetic potential, and then the magnetic induction intensity between two points is solved according to the magnetic potential difference of the node, which can be represented by the formula Ba,b＝[Fa-Fb]·Ga,b/Sa,bAnd (6) obtaining. And setting each step length for the motion of the rotor, and when the rotor rotates one step length, rebuilding the model and solving the built nonlinear matrix equation again. In this way, the magnetic flux density of the levitation and torque windings in the single-phase energization period (0-7.5 °) can be obtained, and the characteristics such as flux linkage, inductance, back electromotive force, and the like can be calculated.
The invention has the following beneficial effects:
1. the invention respectively calculates each magnetic conductance of the hybrid excitation double-stator magnetic suspension switched reluctance motor, and divides the air gap magnetic field which is continuously changed into a series of regular magnetic fields according to the simulation result of finite element software. And an integral dynamic equivalent magnetic network model of the motor is established, so that the accuracy and the modeling speed of the model are improved. Especially in the initial design stage of the motor, a large amount of time can be saved, and the design efficiency of the motor is improved.
2. The invention analyzes the magnetic conductance of the torque air gap which changes all the time in the moving process of the rotor by adopting a segmentation method, divides the relative position of the outer stator and the rotor teeth into a plurality of regions for research, and solves the magnetic conductance of each region.
3. The equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor, which is established by the invention, can predict the electromagnetic performance of the motor, can directly calculate the air gap flux density of the motor and the flux linkage and inductance characteristics of suspension and torque windings, and reduce the early analysis time of the motor design.
Drawings
FIG. 1 is a topological block diagram of a motor used in the present invention;
FIG. 2 is a schematic diagram of motor torque used in the present invention;
fig. 3 is a suspension schematic diagram of a motor used in the present invention:
FIG. 4 is a magnetic flux distribution diagram of a motor used in the present invention;
FIG. 5(a) is a model of the magnetic conductance of the inner and outer stator and rotor teeth of an electric machine used in the present invention;
FIG. 5(b) is a model of the magnetic conductance of inner and outer stator and rotor yoke portions of a motor used in the present invention;
fig. 6 is a schematic view of the air gap division between the outer stator and the rotor of the motor used in the present invention.
FIG. 7 is a diagram of an equivalent magnetic network model architecture for a motor used in the present invention;
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be described in detail with reference to the accompanying drawings and examples.
In order to more simply and clearly illustrate the beneficial effects of the invention, the following detailed description is made in conjunction with a specific 24/16/8-pole hybrid excitation double-stator magnetic suspension switched reluctance motor: fig. 1 is a topological structure diagram of the motor, which comprises a twenty-four-pole outer stator 1, a sixteen-pole rotor 4, an eight-pole hybrid inner stator 6, a torque air gap 3 and a suspension air gap 5, wherein the hybrid inner stator 6, the rotor 4 and the outer stator 1 are sequentially coaxially nested from inside to outside. The outer stator of the motor is 24 stator tooth poles distributed at equal intervals, which are divided into A, B, C three phases, and each phase is provided with eight tooth poles. Each stator is wound with a torque winding 2, namely the torque winding 2 is divided into three phases, and each eight pole is connected in series to form one phase; when current is passed through the torque winding 6, an electromagnetic torque is generated. The hybrid inner stator 6 consists of four control magnetic poles 6-1, four permanent magnetic poles 6-2 and permanent magnets 8, the control magnetic poles 6-1 and the permanent magnetic poles 6-2 are distributed at intervals, the four permanent magnets 8 are respectively embedded on the four permanent magnetic poles 6-2, the permanent magnets 8 are magnetized in the radial direction, the radial width of the permanent magnets is equal to the width of the permanent magnetic poles 6-2, a bias magnetic field is provided for the suspension of the rotor 4, a coil for generating the bias magnetic field is omitted, the loss is reduced, and the efficiency is improved; the control magnetic field generated by the control winding 7 and the bias magnetic field generated by the permanent magnet 8 act together to realize the suspension of the motor. The structure ensures the electric/power generation of the motor. The problem of coupling between torque and suspension is solved, and decoupling between radial two-degree-of-freedom suspension force winding windings is realized.
As shown in fig. 2, the torque working principle of the hybrid excitation double-stator magnetic suspension switched reluctance motor is that the torque of the motor is generated by the action of the outer stator 1 and the rotor 4, and is an 24/16-pole switched reluctance motor. Taking phase A as an example, current is introduced in the direction shown in the figure to provide a torque magnetic field phi for the motorTThe phases B and C are connected in the windingIn the same manner as phase A. Like the operating principle of switched reluctance machines, the "flux guide maximization principle" is followed when the torque winding is energized. When the phase A is conducted, a closed magnetic circuit is formed in the outer stator 1, the torque air gap 3 and the rotor 4, and the magnetic field is distorted to generate a shear force. The tangential magnetic pull force is utilized to drive the rotor to rotate, so that torque is generated.
As shown in fig. 3, in the suspension schematic diagram of the hybrid excitation double-stator magnetic suspension switched reluctance motor, the suspension force is generated by the current excitation of the permanent magnet 8 and the suspension winding 7 on the inner stator. The permanent magnet 8 provides a bias magnetic flux phimThe magnetic field passes through the permanent magnetic pole 6-2, the suspension air gap 5, the rotor magnetic yoke 4-4, the suspension air gap 5 and the control magnetic pole 6-1 to be closed. Two pole suspension windings 7 which are opposite in radial direction are connected in series, taking the x direction as an example, the control magnetic flux phi generated by the current of the suspension winding 7xAnd returns to the magnetic pole through the control magnetic pole 6-1, the suspension air gap 5, the rotor magnetic yoke 4-2 and the suspension air gap 5. The control magnetic circuit does not pass through the permanent magnet magnetic pole, because the magnetic resistance of the permanent magnet is large, demagnetization of the permanent magnet cannot be caused, and the situation of short circuit of the permanent magnet cannot occur.
When i isxWhen the magnetic flux phi is equal to 0, the permanent magnet 8 generates permanent magnetic flux phimBecause of the symmetry of the magnetic circuit, the magnetic densities at the circumference of the suspension air gap 5 are equal, the suspension force is zero, and the rotor is in a balanced position. When the rotor is disturbed in the x negative direction, the rotor shifts in the x negative direction, the magnetic fields on the left side and the right side in the x direction are unbalanced, the suspension air gap 5 in the x negative direction is reduced, the suction force is increased, the suspension air gap 5 in the x positive direction is increased, and the suction force is reduced. At this time, the x-direction levitation winding 7 is supplied with a current ixGenerating a two-pole control magnetic flux phixControlling the magnetic flux phixMagnetic flux phi with permanent magnetmThe direction of the suspension air gap in the negative x direction is opposite, the magnetic field is weakened, the direction of the suspension air gap in the positive x direction is the same, the magnetic field is strengthened, and the suspension force in the positive x direction is generated, so that the rotor returns to the balance position.
Step 1, dividing disordered and regular areas of magnetic force lines in the motor.
Fig. 4 is a magnetic line analysis diagram of a motor used in the embodiment of the present invention. It can be seen that the magnetic lines of force in the stator tooth, yoke and permanent magnet regions are regular, while the distribution of the magnetic lines of force in the torque air gap region between the outer stator and the rotor, which is the place for electromagnetic energy conversion, is complex, and the magnetic field of the part is easy to distort.
And 2, establishing a magnetic conductance model of the tooth part and the yoke part of the stator and the rotor.
Fig. 5(a) is a schematic diagram of a stator model of a motor used in the embodiment of the present invention, which may be equivalent to a rectangular model, and the magnitude of the flux guide G of the portion may be obtained through ampere loop law;
Figure BDA0003324272510000051
where μ is the permeability of the corresponding material,. mu.aThe axial length of the motor, w is the width of the magnetic cross-sectional area perpendicular to the magnetic flux direction, and l is the length in the magnetic flux direction.
Fig. 5(b) is a schematic diagram of a yoke model of a motor used in the embodiment of the present invention, which may be equivalent to a sector model, and the flux guide G of the sector model may be derived by calculus according to a basic rectangular model:
Figure BDA0003324272510000052
in the formula, R1、R2And θ represents the inner radius, outer radius and opening arc of the sector model. laMu is the magnetic permeability of the corresponding material, which is the axial length of the machine.
And 3, establishing a torque air gap magnetic conductance model.
Because the outer stator and the rotor of the motor are both in a salient pole structure, an edge effect and a local saturation phenomenon exist between the outer stator and the rotor, and an air gap magnetic field between the outer stator and the rotor is continuously changed along with the movement of the rotor. The torque air gap permeance can be processed by adopting a division method, a torque air gap magnetic field is divided into a plurality of regions with regular shapes, the permeance with the regular shapes is obtained, and the total permeance of the whole air gap is obtained according to the series-parallel connection relation. As shown in fig. 6, which is a cut-away view of the air gap, the air gap permeance is a combination of one or more of the shaded portions in fig. 6 when the rotor is moved to any position.
Step 4, establishing a magnetomotive force model of the permanent magnet and the winding
The magnetomotive force in the magnetic field being generated by windings and permanent magnets, the winding magnetic potential FnThe size of (d) can be expressed as:
Fn＝∮H·dl＝Nci (3)
wherein H is the magnetic field strength, l is the perimeter of the closed loop, NcAnd i is the current passing through the winding for the number of winding turns.
The permanent magnet equivalent model may be expressed as a series combination of magnetomotive force and flux guide. For a permanent magnet material, the magnetic permeability is fixed and can be expressed by a constant value magnetic conductance, and the estimation formula of the magnetomotive force and the magnetic conductance of the permanent magnet is as follows.
Figure BDA0003324272510000061
In the formula, Fpm、Gpm、μrm、μ0And BrmRepresents the equivalent magnetomotive force, the equivalent magnetic conductance, the relative magnetic conductance, the vacuum magnetic conductance and the remanence of the permanent magnet; h ism、laAnd lmIndicating the width of the permanent magnet, the axial length of the machine and the length of the permanent magnet.
Step 5, integrating the models
As shown in fig. 7, the stator tooth magnetic conductance network model, the stator yoke magnetic conductance network model, the rotor tooth magnetic conductance network model, the rotor yoke magnetic conductance network model, and the air gap magnetic conductance model are connected according to a corresponding relationship to form an equivalent magnetic network model of the whole motor.
And 6, establishing a matrix equation, solving the magnetic potential of each node, and further obtaining the electromagnetic property.
Similar to the solution of the circuit, the solution of the magnetic circuit also satisfies kirchhoff voltage law and kirchhoff current law, and can be solved by adopting a node magnetomotive method. It is noted that once the complete equivalent magnetic network model is built, the total number of nodes is constant. In this case, the flux guide matrix, the node magnetomotive matrix, and the flux matrix satisfy the following relationships:
G·F＝Φ (5)
in the formula, G denotes a flux guide matrix, and F and Φ denote a node magnetic potential matrix and a magnetic flux matrix.
According to the equivalent magnetic network model established in fig. 7, the total number of nodes is observed to be 92, and the number is 0-91.
Figure BDA0003324272510000062
Calculating the magnetic induction intensity of the two points according to the node magnetic potential difference, and adopting the following formula:
Figure BDA0003324272510000063
wherein B is magnetic induction, FiIs the magnetic potential of node i, FjIs the magnetic potential of node j, G(i，j)Is the flux guide between nodes i and j, and S is the cross-sectional area corresponding to nodes i and j.
The flux linkage psi of each phase winding corresponding to the theta position can be further obtainedθInductor LθAnd a back electromotive force E, the calculation formula is as follows:
ψθ＝NSBθ (8)
Figure BDA0003324272510000064
Figure BDA0003324272510000065
where N denotes the number of turns of the winding, S denotes the cross-sectional area of the teeth, BθIndicates the magnetic induction at the position corresponding to theta, ipThe magnitude of the input current to the winding. The hybrid excitation double-stator magnetic suspension switched reluctance motor model established by the invention can predict the motorThe electromagnetic characteristics can directly calculate the suspension, torque flux linkage, inductance and back electromotive force of the motor, and the initial design efficiency of the motor is improved.
In summary, the method for analyzing the equivalent magnetic network of the hybrid excitation double-stator magnetic suspension switched reluctance motor comprises the steps of dividing ordered and disordered regions of magnetic force lines, dividing the ordered regions into rectangular and sector models to solve the flux guide, and adopting a division method to solve the flux guide in the disordered air gap region. And establishing an equivalent magnetic network model by combining the magnetic field distribution characteristics of the motor. Solving the matrix equation to obtain the magnetic potential of each node, and further solving the static characteristics of magnetic linkage, inductance, back electromotive force and the like of the suspension and torque windings. And verifying the effectiveness and accuracy of the model by using the result of the equivalent magnetic network model solution and finite element analysis. The invention firstly carries out equivalent magnetic network modeling on the hybrid magnetic double-stator magnetic suspension switched reluctance motor, and the proposed scheme can provide reference research for modeling of the motor.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (7)

1. A method for establishing an equivalent magnetic network model of a hybrid excitation double-stator magnetic suspension switched reluctance motor is characterized by comprising the following steps:
step 1, dividing disordered and regular areas of magnetic force lines in a motor;
step 2, magnetic conductance models of inner and outer stator teeth, rotor teeth and yoke parts of the motor are established, the stator teeth, the rotor teeth and the yoke parts of the motor are used as fixed magnetic conductance parts, the fixed magnetic conductance has two basic models, one is a rectangular model and the other is a fan-shaped model, and the magnetic conductance models of the fixed parts are connected into a fixed magnetic conductance network model;
step 3, dividing an air gap magnetic field between the outer stator teeth and the rotor teeth into flux tubes with regular shapes, calculating air gap permeance of each block, and then connecting the permeance of an air gap part in parallel to form an air gap permeance network model;
step 4, the permanent magnet is equivalent to the series combination of magnetomotive force and magnetic conductance;
step 5, combining the fixed magnetic permeability network model, the air gap magnetic permeability network model and the permanent magnet magnetic network model in series and parallel according to corresponding position relations to form an equivalent magnetic network model of the whole motor and establish a magnetic permeability matrix equation;
and 6, writing out a node magnetic potential equation of the whole motor equivalent magnetic network model, solving the equation, solving the magnetic potential of each node and the magnetic flux of the flux guide, and further solving each static characteristic of the motor.
2. The method for establishing the equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor according to claim 1, wherein the hybrid excitation double-stator magnetic suspension switched reluctance motor is divided into four parts, namely an outer stator, an inner stator, a rotor and an air gap; the outer stator, the inner stator and the rotor core are made of DW465-50 silicon steel sheets, 24 teeth poles are distributed on the outer stator of the motor at equal intervals, wherein 8 teeth poles are connected in series to form one phase, 16 teeth poles are distributed on the rotor at equal intervals, and the rotor is of a salient pole structure and has no winding; the inner stator consists of 8 salient poles which are symmetrically distributed and 4 permanent magnets, the permanent magnets are made of neodymium iron boron NdFe30, the permanent magnets provide bias magnetic flux for the rotor in a radial magnetizing mode, magnetic poles are changed alternately in an NS mode and form an eight-pole magnetic field together with control magnetic flux, other 4 poles and the permanent magnets are distributed at intervals, the suspension current in the x direction controls the suspension force in the x direction, and the suspension current in the y direction controls the suspension force in the y direction.
3. The method for establishing the equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor according to claim 1, wherein in the step 1, finite element software is adopted to simulate the motor to obtain the distribution map of magnetic lines of force inside the motor, the regular regions of the magnetic lines of force are mainly concentrated on the teeth and the yoke parts of the stator and the rotor, and the disordered regions are concentrated on the air gap part between the teeth and the rotor of the outer stator of the motor.
4. The method for establishing the equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor according to claim 1, wherein in the step 2, the yoke parts of the stator and the rotor are divided into corresponding parts according to the corresponding number of the teeth, the cross section of the yoke parts is similar to a fan shape, so that each yoke part can be equivalent to a magnetic conductance; the sectional area of the stator and rotor teeth is rectangular, and the tooth part of each stator and rotor is equivalent to a magnetic conductance.
5. The method for establishing the equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor according to claim 1, wherein in the step 3, the outer stator and the rotor teeth of the motor are both in a salient pole structure, so that the air gap between the outer stator and the rotor teeth is not uniformly distributed, when calculating the magnetic conductance of the portion, the region of the portion is divided into a plurality of regular shapes, the magnetic conductance values of the regular shapes are calculated one by one, and then the magnetic conductances are connected in series and in parallel to obtain the magnetic conductance value of the whole air gap.
6. The method for establishing the equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor according to claim 1, wherein in the step 5, the connection mode of the magnetic conductance and the magnetic conductance of each part is determined, a complete equivalent magnetic network model is established, the established magnetic network models are numbered, the solution of the circuit is similar to that of the circuit, the solution of the magnetic circuit also satisfies kirchhoff voltage law and kirchhoff current law, the solution can be performed by adopting a node magnetomotive method, and a magnetic conductance matrix equation G.F.phi.G is a magnetic conductance matrix, and F and phi are a node magnetomotive force and a magnetic flux matrix.
7. The method for establishing the equivalent magnetic network model of the hybrid excitation double-stator magnetic suspension switched reluctance motor according to claim 1, wherein in the step 6, the matrix equation is solved in MATLAB to obtain the magnitude of the node magnetic potential, and then the magnetic induction intensity between two points is solved according to the magnetic potential difference of the node, and the formula B can be useda，b＝[Fa-Fb]·Ga，b/Sa，bObtaining a solution of a compound represented by the formulaa,bRepresenting the magnetic flux density between two nodes of a, b, FaAnd FbNode magnetic potential, G, representing nodes a and ba,bRepresenting the equivalent permeance, S, between nodes a, ba,bRepresents the cross-sectional area of the magnetic flux corresponding to the nodes a and b; each step length is set for the movement of the rotor, when the rotor rotates one step length, a model needs to be established again, the established nonlinear matrix equation is solved again, and therefore the magnetic flux density of the suspension and torque windings in a single-phase power-on period (0-7.5 degrees) can be obtained, and the characteristics of a magnetic linkage, an inductance, a back electromotive force and the like are further calculated.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116794997A (en) * 2022-03-13 2023-09-22 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） Linear motor simulation modeling method based on semi-physical simulation platform
CN116992723A (en) * 2023-07-31 2023-11-03 重庆理工大学 Motor dynamic magnetic network modeling method
CN118074372A (en) * 2024-04-17 2024-05-24 南京汉科明德医疗科技有限公司 Stator and rotor structure suitable for self-sensing magnetic levitation motor and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116794997A (en) * 2022-03-13 2023-09-22 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） Linear motor simulation modeling method based on semi-physical simulation platform
CN116992723A (en) * 2023-07-31 2023-11-03 重庆理工大学 Motor dynamic magnetic network modeling method
CN116992723B (en) * 2023-07-31 2024-01-16 重庆理工大学 Motor dynamic magnetic network modeling method
CN118074372A (en) * 2024-04-17 2024-05-24 南京汉科明德医疗科技有限公司 Stator and rotor structure suitable for self-sensing magnetic levitation motor and manufacturing method thereof

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