CN111064331A - Bearingless permanent magnet sheet motor with double-stator structure - Google Patents
Bearingless permanent magnet sheet motor with double-stator structure Download PDFInfo
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- CN111064331A CN111064331A CN201911338130.5A CN201911338130A CN111064331A CN 111064331 A CN111064331 A CN 111064331A CN 201911338130 A CN201911338130 A CN 201911338130A CN 111064331 A CN111064331 A CN 111064331A
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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
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2726—Inner 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
- H02K1/2733—Annular magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
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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
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- 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
Abstract
The invention discloses a bearingless permanent magnet sheet motor with a double-stator structure, which is characterized in that an inner stator iron core column, a permanent magnet sheet rotor and an outer stator iron core column which are coaxially arranged from inside to outside in the radial direction are sequentially arranged, the inner stator iron core column is provided with 6 inner stator columns which are uniformly arranged along the circumferential direction, the axial section of each inner stator column is L-shaped, the radial section of each L-shaped inner stator column faces the permanent magnet sheet rotor, and an inner stator suspension force winding is wound on the axial section; the outer stator core column is provided with 6 outer stator columns which are uniformly arranged along the circumferential direction, the outer stator columns and the inner stator columns are arranged in a face-to-face radial mode, the radial section of each outer stator column faces the permanent magnet slice rotor, and an outer stator torque winding is wound on the axial section; the end parts of the axial sections of the inner stator core column and the outer stator core column form a common bottom core magnetic yoke, magnetic fields generated by the two sets of windings are independent of each other, the coupling between electromagnetic torque and suspension force is reduced, and the permanent magnet rotor is subjected to electromagnetic attraction on the inner ring and the outer ring.
Description
Technical Field
The invention relates to a novel improved motor structure for a bearingless permanent magnet sheet motor, which is widely applied to the fields of sealed pumps, industrial pharmacy, life science and the like.
Background
The magnetic suspension bearing is a novel high-performance bearing which utilizes a magnetic field to enable a rotor to be in a stable suspension state, so that the rotor is not in mechanical contact with a stator, and the magnetic suspension bearing has a series of advantages of no friction, no abrasion, no lubrication and the like. The high-speed motor supported by the magnetic suspension bearing is formed by replacing the traditional mechanical bearing in the high-speed motor by the magnetic suspension bearing, but the high-speed motor supported by the magnetic suspension bearing occupies a large axial space, so that the rotating speed of the motor is limited due to the large axial length of the motor, a certain number of magnet exciting coils and inverter devices are required, and a series of factors such as complex control system, high cost and the like influence the application range of the high-speed motor supported by the magnetic suspension bearing in the industrial field. In order to overcome the disadvantages of the high-speed motor supported by the magnetic bearing, some researchers propose that a suspension force winding generating suspension force and a torque winding generating torque are embedded in a stator iron core of the motor at the same time, so that the stator winding of the motor can generate electromagnetic torque and suspension force, and the motor without the bearing is formed. The motor supported by the traditional magnetic suspension bearing to the bearingless motor reduces the axial volume of the motor, but the complexity of a control system is still large. To further reduce the complexity of the system, passive levitation must be achieved with as many degrees of freedom as possible.
A bearingless permanent magnet slice motor belongs to the new field of bearingless motor research, the axial length of a permanent magnet rotor of the bearingless permanent magnet slice motor is far smaller than the outer diameter of the rotor, the bearingless permanent magnet slice motor is flaky and is a five-freedom-degree full-suspension motor, active suspension of 2 radial degrees of freedom can be realized by utilizing a suspension force winding, and passive suspension of three degrees of freedom (one axial degree of freedom and two torsional degrees of freedom) can be realized according to the magnetic resistance minimum principle due to a special slice structure of the bearingless permanent magnet. The motor not only has a series of advantages of a bearingless motor, but also has the characteristics of small volume, high power factor, small loss and the like. However, in the operation process of the conventional bearingless permanent magnet sheet motor, the phenomenon that the permanent magnet rotor floats upwards and deviates from the balance position can occur due to insufficient electromagnetic attraction force generated between the permanent magnet rotor and the motor stator, so that the improvement of the rotating speed and the power of the bearingless permanent magnet sheet motor is limited. And because the torque winding and the suspension force winding are positioned on the same stator, the electromagnetic torque and the suspension force of the motor have strong coupling, so that the bearingless permanent magnet thin-sheet motor is difficult to control.
Chinese patent publication No. CN109347226A discloses a bearingless permanent magnet sheet motor, in which a discoid rotor permanent magnet is coaxially and fixedly connected to an axial top surface of a cross-shaped sheet rotor having a cross-shaped radial cross section, 6 identical L-shaped stator core columns are uniformly distributed on the periphery of the cross-shaped sheet rotor along a circumferential direction, an annular stator permanent magnet is coaxially and fixedly disposed on a tooth top surface of a stator of the 6L-shaped stator core columns, the stator permanent magnet and the rotor permanent magnet are both axially magnetized and have opposite magnetizing directions, so as to improve reliability and axial stiffness of the rotor, but the motor uses more permanent magnets in order to increase axial stiffness, and has higher cost. The document with the Chinese patent application number of CN204408154U provides a modularized stator permanent magnet type bearingless motor, each module is composed of 1E-shaped magnetic iron core and 1 permanent magnet, the protruded teeth in the middle of the E-shaped iron core are fault-tolerant teeth, loops are provided for a suspension winding and an armature winding coil to realize decoupling, the permanent magnet is positioned between two adjacent E-shaped magnetic iron cores, the permanent magnet is magnetized in a tangential direction, a torque winding is wound on the permanent magnet to generate mechanical torque, and meanwhile, the suspension force winding stretches across two sides of the fault-tolerant teeth to generate suspension force.
Disclosure of Invention
The invention aims to overcome the existing defects and provides a bearingless permanent magnet sheet motor with a double-stator structure, which can improve the stability of passive suspension and reduce the control difficulty.
In order to achieve the purpose, the invention adopts the technical scheme that: the inner stator iron core column, the permanent magnet slice rotor and the outer stator iron core column which are coaxially arranged from inside to outside in sequence in the radial direction, wherein the inner stator iron core column is provided with 6 inner stator columns which are uniformly arranged along the circumferential direction, the axial section of each inner stator column is L-shaped, each L-shaped inner stator column is formed by an axial section which is axially arranged and a radial section which is radially arranged, the radial section is an inner stator tooth part and is right opposite to the permanent magnet slice rotor, and an inner stator suspension force winding is wound on the axial section; the outer stator iron core column is provided with 6 outer stator columns which are uniformly arranged along the circumferential direction, the axial section of each outer stator column is L-shaped and is radially arranged in a face-to-face mode with the L-shaped inner stator column, the radial section of each L-shaped outer stator column is an outer stator tooth part and is opposite to the permanent magnet sheet rotor, and an outer stator torque winding is wound on the axial section; the permanent magnet slice rotor is in a ring shape, is magnetized in parallel along the radial direction, has the same axial thickness as the tooth parts of the radial sections of the inner stator iron core column and the outer stator iron core column, and has two end faces in the axial direction which are parallel and level; the ends of the axial sections of the inner stator core limb and the outer stator core limb are yoke parts which are connected into a whole to form a common bottom iron core magnetic yoke.
The invention has the advantages that:
1. the invention adopts a double-stator structure, the suspension force winding is arranged on 6 iron core columns of the inner stator, and the torque winding is arranged on 6 iron core columns of the outer stator. Two sets of windings are both centralized windings, the end parts are short, the loss is low, the efficiency is high, the axial length of the motor is reduced, and meanwhile, the power density is improved. The magnetic fields generated by the two sets of windings are independent of each other, so that decoupling can be realized without a complex control algorithm, independent control is realized, and the coupling between electromagnetic torque and suspension force can be reduced. The torque generation principle of the permanent magnet synchronous motor is the same as that of the traditional permanent magnet synchronous motor, and a mature control strategy can be well applied to the permanent magnet synchronous motor, so that the control difficulty of the motor is greatly reduced.
2. In the axial control, the sheet rotor is controlled by the magnetic resistance of the motor to realize the passive suspension control of three degrees of freedom of the axial translation and the front-back and left-right turning motion of the sheet rotor, and the complexity of the hardware of a digital control system and the software of the control system is reduced. The invention adopts a double-stator structure to enable the permanent magnet rotor to be subjected to electromagnetic suction on the inner ring and the outer ring, so that the axial bearing capacity and stability of the permanent magnet rotor are greatly improved, and the permanent magnet rotor has small volume, high power factor and small loss.
Drawings
FIG. 1 is an axial cross-sectional view of a bearingless permanent magnet sheet motor of a double stator structure according to the present invention;
FIG. 2 is a schematic radial cross-sectional view of a bearingless permanent magnet sheet motor of a dual stator configuration in accordance with the present invention;
FIG. 3 is a front view of the rigid plastic pallet 10 of FIG. 1;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic diagram illustrating the flow path of magnetic lines generated during operation of the present invention;
FIGS. 6, 7, 8 and 9 are schematic views of the principle of active suspension in two radial degrees of freedom when the present invention is in operation;
fig. 10 and 11 are schematic diagrams of the working principle of the passive suspension in three degrees of freedom in the axial direction when the passive suspension device works.
In the figure: 1-permanent magnet thin sheet rotor, 2-inner stator iron core column, 3-outer stator iron core column, 4-outer stator torque winding, 5-inner stator suspension force winding, 6-bottom iron core magnetic yoke, 7-steel top disc, 8-top hard plastic bracket, 9-bottom hard plastic bracket, 10-hard plastic tray, 10-1-circular groove, 11-inner stator hard plastic bracket, 12-steel chassis, 13-outer stator radial air gap, 14-inner stator radial air gap, 15-steel casing, 16-cross groove countersunk head screw, 17-magnetic line, 18-displacement sensor probe.
Detailed Description
Referring to fig. 1 and 2, the present invention has an inner stator core limb 2, a permanent magnet sheet rotor 1 and an outer stator core limb 3 arranged coaxially in the radial direction from the inside to the outside.
The permanent magnet slice rotor 1 is in a circular ring shape, is made of a whole circular permanent magnet, is magnetized in parallel along the radial direction, the N pole of the permanent magnet occupies a half circular ring on one side of the whole circular ring, and the S pole of the permanent magnet occupies a half circular ring on the other side.
The inner stator iron core column 2 is formed by laminating silicon steel sheets with good magnetic conductivity, and 6 inner stator columns are uniformly arranged along the circumferential direction to form the inner stator iron core column 2, so that an inner stator part of the motor is formed. The 6 inner stator columns are uniformly distributed along the inner ring of the permanent magnet thin sheet rotor 1, and a radial air gap is reserved between the 6 inner stator columns and the permanent magnet thin sheet rotor. The axial section of each inner stator cylinder is L-shaped, the L-shaped inner stator cylinder is formed by an axial section and a radial section, the axial section is arranged along the axial direction of the motor, the radial section is arranged along the radial direction of the motor, the radial section extends outwards to form a tooth part of the inner stator, the tooth part of the inner stator is right opposite to the permanent magnet thin-sheet rotor 1, and an inner stator suspension force winding 5 is wound on the axial section.
The outer stator iron core column 3 is formed by laminating silicon steel sheets with good magnetic conductivity, and 6 outer stator columns are uniformly arranged along the circumferential direction to form the outer stator iron core column 3, so that an outer stator part of the motor is formed. The 6 outer stator cylinders are uniformly distributed along the outer ring of the permanent magnet sheet rotor 1, and a radial air gap is reserved between the 6 outer stator cylinders and the permanent magnet sheet rotor. The axial section of each outer stator cylinder is L-shaped, and the outer stator cylinder and the inner stator cylinder are same in structure and are arranged in a face-to-face radial mode. The radial section of the L-shaped outer stator cylinder is a tooth part of the outer stator and is opposite to the permanent magnet thin sheet rotor 1, and the axial section is wound with an outer stator torque winding 4.
The axial thickness of the permanent magnet thin sheet rotor 1 is the same as that of the tooth parts of the radial sections of the inner stator core limb 2 and the outer stator core limb 3, and the two end faces of the three are flush in the axial direction, so that the permanent magnet thin sheet rotor 1 can be stably in dynamic suspension in the axial direction.
The outer stator torque winding 4 is made of copper with good conductivity and wire diameterφ1=2.75mm, the maximum allowable current is around 8A. The inner stator suspension force winding 5 is also made of copper with better conductivity, and the wire diameter isφ2=1.5mm, maximum allowable current of around 5A. 4 pole pairs of outer stator torque windingp 1=1, number of pole pairs of inner stator suspension winding 5p 2And (2). The pole pair number and angular frequency of the two sets of the outer stator torque winding 4 and the inner stator suspension force winding 5 meet the requirementsp 2=p 1±1，ω 1=ω 2，ω 1Is the angular frequency of the outer stator torque winding 4,ω 2the angular frequency of the inner stator suspension force winding 5 meets the principle of generating radial suspension force, the outer stator torque winding 4 is used for generating the radial suspension force of the motor, and the inner stator suspension force winding 5 is used for generatingGenerating an electromagnetic torque when the motor rotates; both adopt centralized distributed windings and are connected with three-phase current.
The end connection of the axial section of the inner stator iron core column 2 and the outer stator iron core column 3 is integrated to form a common yoke part, namely a bottom iron core magnetic yoke 6, wherein the bottom iron core magnetic yoke 6 is disc-shaped and is formed by laminating silicon steel sheets with better magnetic permeability. The disc is provided with 12 mounting slotted holes which are respectively used for tightly fixing the inner stator core limb 2 and the outer stator core limb 3 so as to facilitate the circulation of the magnetic force line of the permanent magnet sheet rotor 1.
The outer side wall of the tooth part of the outer stator iron core column 3 is tightly wrapped with a layer of top hard plastic support 8, the top hard plastic support 8 is of a hard plastic circular ring-shaped sleeve structure, and a notch matched with the tooth part of the outer stator iron core column 3 is formed in the inner ring side wall of the top hard plastic support for fixing the tooth part of the outer stator iron core column 3. Similarly, a layer of bottom hard plastic bracket 9 is tightly wrapped on the outer side wall of the bottom iron core magnetic yoke 6 and used for fixing the yoke part of the outer stator iron core column 3. The yoke part of the outer stator core column 3 and the end face of the bottom hard plastic support 9 are fixedly connected with a steel chassis 12, the steel chassis 12 is of a steel disc-shaped structure, is tightly attached to the bottom iron core magnetic yoke 6 and the bottom hard plastic support 9, and plays a role in fixing and supporting the motor. And a steel top disc 7 is tightly attached to the end face of the tooth part of the outer stator core column 3, and the steel top disc 7 is in a ring shape.
The inner stator core limb 2, the teeth of the outer stator core limb 3 and the permanent magnet sheet rotor 1 are separated by a hard plastic tray 10, and the structure of the hard plastic tray 10 is shown in fig. 3 and 4. The hard plastic tray 10 is a disc with a circular groove 10-1, and the permanent magnet slice rotor 1 is placed in the circular groove 10-1. The hard plastic tray 10 is clamped on the tooth parts of the inner stator and the outer stator, the outward extending part of the hard plastic tray is tightly attached to the end face of the steel top disc 7, and the middle part of the hard plastic tray is tightly attached to the end face of the tooth part of the inner stator core column 2. The permanent magnet thin sheet rotor 1 is suspended on the axial space by the electromagnetic attraction generated between the permanent magnet thin sheet rotor 1 and the tooth parts of the inner stator iron core column 2 and the outer stator iron core column 3, and a certain air gap is generated between the permanent magnet thin sheet rotor 1 and the inner bottom surface of the circular groove 10-1, so that the permanent magnet thin sheet rotor 1 can rotate in a suspended mode on the axial space.
An inner stator hard plastic support 11 is tightly sleeved on the inner side wall of the tooth part of the inner stator iron core column 2 and is tightly attached to the inner stator iron core column 2, the inner stator hard plastic support 11 is a circular cylindrical hard plastic structure, and 6 rectangular notches are uniformly formed along the outer side wall of the inner stator hard plastic support and are installed together with the tooth part of the inner stator iron core column 2 so as to fix the tooth part of the inner stator iron core column 2.
On the lateral wall of the inner stator core limb 2, a radial displacement sensor probe 18 is arranged at the middle part of every two rectangular notches, and 6 radial displacement sensor probes 18 are uniformly distributed along the circumferential direction.
The steel casing 15 is sleeved outside the outer stator iron core column 3 and the outer stator torque winding 4, and the steel casing 15 is of a steel annular protection and heat dissipation structure. One end of the steel shell 15 is fixedly connected with the steel top plate 7 through a cross recessed countersunk head screw 16, and the other end is fixedly connected with the steel bottom plate 12.
The permanent magnet thin sheet rotor 1 is not contacted with the hard plastic tray 10, and an outer stator radial air gap 13 and an inner stator radial air gap 14 are respectively formed to provide space for the rotation of the permanent magnet thin sheet rotor 1.
There is very strong electromagnetic attraction between permanent magnet thin sheet rotor 1 and inner stator core limb 2 and outer stator core limb 3 for taking out and placing of permanent magnet thin sheet rotor 1 becomes very difficult, and the purpose of hard plastic tray 10 is to provide great convenience for taking out and placing of permanent magnet thin sheet rotor 1.
Referring to fig. 5, in operation, the path of the generated magnetic flux 17 has two parts: one part of the permanent magnet enters an outer stator iron core column 3 from the N pole of a permanent magnet of the permanent magnet sheet rotor 1 through an outer stator radial air gap 13, then passes through a bottom iron core yoke 6 from the outer stator iron core column 3 to the outer stator iron core column 3 on the other side, and then passes through the outer stator radial air gap 13 to reach the S pole of the rotor permanent magnet; the other part of the permanent magnet enters the inner stator iron core column 2 from the N pole of the permanent magnet through the inner stator radial air gap 14, then goes out of the inner stator iron core column 2, passes through the bottom iron core magnetic yoke 6 to the inner stator iron core column 2 at the other side, and then reaches the S pole of the permanent magnet through the inner stator radial air gap 14.
Referring to FIGS. 6, 7, 8 and 9, the present invention is shown in radial directionWhen the degree of freedom actively suspends, when the permanent magnet thin sheet rotor 1 is kept at a balance position and does not generate eccentric displacement, current with a certain amplitude is introduced into the inner stator suspension force winding 5, a generated magnetic field is superposed on an original magnetic field, the state of the original uniform magnetic field is changed, the surface magnetic field of the permanent magnet thin sheet rotor 1 is not uniform any more, and the resultant force of Maxwell forces in all directions at an air gap interface is not zero. The Maxwell force in this case can be analyzed in four cases, such as the magnetic field generated by the current of the two-pole inner stator suspension force winding 5 in FIG. 6Ψ BMagnetic field generated by current flowing through an outer stator torque winding 4 of a pair of polesΨThe layers are superposed and then are subjected to the step of stacking,xthe flux linkage direction of the magnetic field is the same in the positive axial direction region, the air gap flux density is increased, andxthe magnetic field flux linkage directions of the areas in the axial negative direction are opposite, the air gap flux density is reduced, and the Maxwell tensor on the surface of the permanent magnet thin sheet rotor 1 is not balanced any more and is subjected to the action of the magnetic field flux linkage directionsxThe resultant force in the positive direction of the axis. According to the same principle, as in fig. 7, 8 and 9, the current phase angle of the inner stator suspension force winding 5 is changed, so that the generated current magnetic field of the inner stator suspension force winding 5 is changed, and the current magnetic field is respectively generated on the surface of the permanent magnet sheet rotor 1yThe positive direction of the axis,xAxial negative direction andymaxwell forces in the negative direction of the axis. This force is referred to as a controlled Maxwell force or radial levitation force.
Referring to fig. 10 and 11, when the three-degree-of-freedom passive suspension is performed in the axial direction, fig. 10 is a schematic diagram of magnetic resistance generated when the permanent magnet sheet rotor 1 is displaced in the axial direction, and fig. 11 is a schematic diagram of magnetic resistance generated when the permanent magnet sheet rotor 1 is twisted. The magnetic flux generated by the permanent magnets of the permanent magnet thin-sheet rotor 1 starts from the inner and outer stators, passes through the air gap and then reaches the rotor. According to the principle of minimum magnetic resistance, when the permanent magnet thin sheet rotor 1 is displaced axially, the magnetic resistance forceF stabA minimum air gap length will be maintained by restoring the permanent magnet thin sheet rotor 1 to its original position. Meanwhile, as the axial length of the sheet motor is far smaller than the radial diameter, when the permanent magnet sheet rotor 1 is twisted back and forth and left and right, the torque generated by the reluctance force on the permanent magnet sheet rotor isT stabIt will also act in the opposite direction to return it to the equilibrium position.
Claims (6)
1. The utility model provides a no bearing permanent magnetism thin slice motor of two stator structures, radially from interior to exterior is interior stator core limb (2), permanent magnetism thin slice rotor (1) and outer stator core limb (3) that arrange with the axial lead in proper order, characterized by: the inner stator iron core column (2) is provided with 6 inner stator columns which are uniformly arranged along the circumferential direction, the axial section of each inner stator column is L-shaped, each L-shaped inner stator column is formed by an axial section which is axially arranged and a radial section which is radially arranged, the radial section is an inner stator tooth part and is right opposite to the permanent magnet sheet rotor (1), and an inner stator suspension force winding (5) is wound on the axial section; the outer stator iron core column (3) is provided with 6 outer stator cylinders which are uniformly arranged along the circumferential direction, the axial section of each outer stator cylinder is L-shaped and is radially arranged in a face-to-face mode with the L-shaped inner stator cylinder, the radial section of each L-shaped outer stator cylinder is an outer stator tooth part and is opposite to the permanent magnet sheet rotor (1), and an outer stator torque winding (4) is wound on the axial section; the permanent magnet slice rotor (1) is in a ring shape, is magnetized in parallel along the radial direction, has the same axial thickness as the axial thickness of the tooth part of the radial section of the inner stator iron core column (2) and the outer stator iron core column (3), and has two end surfaces in the axial direction which are parallel and level; the end parts of the axial sections of the inner stator iron core column (2) and the outer stator iron core column (3) are yoke parts which are connected into a whole to form a common bottom iron core magnetic yoke (6).
2. A bearingless permanent magnet sheet motor of a double stator structure as claimed in claim 1, wherein: the inner stator iron core column (2), the tooth part of the outer stator iron core column (3) and the permanent magnet thin sheet rotor (1) are separated by a hard plastic tray (10), the hard plastic tray (10) is a disc with a circular groove (10-1), and the permanent magnet thin sheet rotor (1) is placed in the circular groove (10-1); the permanent magnet thin sheet rotor (1) is not contacted with the hard plastic tray (10), and an outer stator radial air gap (13) and an inner stator radial air gap (14) are formed between the permanent magnet thin sheet rotor and the hard plastic tray.
3. A bearingless permanent magnet sheet motor of a double stator structure as claimed in claim 1, wherein: outer stator torque winding (4) and inner statorThe number of pole pairs and angular frequency of the sub-suspension force winding (5) satisfy:p 2=p 1±1，ω 1=ω 2，p 1andω 1respectively the pole pair number and the angular frequency of the outer stator torque winding (4),p 2andω 2the pole pair number and the angular frequency of the inner stator suspension force winding (5) are respectively.
4. A bearingless permanent magnet sheet motor of a double stator structure as claimed in claim 2, wherein: the wire diameter of the outer stator torque winding (4) is 2.75mm, the maximum allowable current is 8A, the wire diameter of the inner stator levitation force winding (5) is 1.5mm, and the maximum allowable current is 5A.
5. A bearingless permanent magnet sheet motor of a double stator structure as claimed in claim 1, wherein: the outer side wall of a tooth part of the outer stator iron core column (3) is tightly wrapped with a layer of top hard plastic support (8), the outer side wall of the bottom iron core magnetic yoke (6) is tightly wrapped with a layer of bottom hard plastic support (9), and the yoke part of the outer stator iron core column (3) and the end face of the bottom hard plastic support (9) are fixedly connected with a steel chassis (12); the end face of a tooth part of the outer stator iron core column (3) is tightly attached to a circular steel top disc (7), the outer sides of the outer stator iron core column (3) and the outer stator torque winding (4) are sleeved with a circular steel casing (15), one end of the steel casing (15) is fixedly connected with the steel top disc (7), and the other end of the steel casing is fixedly connected with the steel chassis (12).
6. A bearingless permanent magnet sheet motor of a double stator structure as claimed in claim 2, wherein: an inner stator hard plastic bracket (11) is tightly sleeved on the inner side wall of the tooth part of the inner stator iron core column (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911338130.5A CN111064331A (en) | 2019-12-23 | 2019-12-23 | Bearingless permanent magnet sheet motor with double-stator structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911338130.5A CN111064331A (en) | 2019-12-23 | 2019-12-23 | Bearingless permanent magnet sheet motor with double-stator structure |
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| CN111064331A true CN111064331A (en) | 2020-04-24 |
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| CN201911338130.5A Pending CN111064331A (en) | 2019-12-23 | 2019-12-23 | Bearingless permanent magnet sheet motor with double-stator structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532002A (en) * | 2020-11-12 | 2021-03-19 | 华中科技大学 | Double-stator excitation full-freedom-degree bearingless motor and active control method thereof |
| CN112865386A (en) * | 2021-03-26 | 2021-05-28 | 扬州工业职业技术学院 | Bearingless permanent magnet thin-sheet motor convenient to overhaul |
| CN116094253A (en) * | 2023-04-12 | 2023-05-09 | 苏州苏磁智能科技有限公司 | Single-winding magnetic suspension motor with magnetic protection structure and magnetic suspension equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112532002A (en) * | 2020-11-12 | 2021-03-19 | 华中科技大学 | Double-stator excitation full-freedom-degree bearingless motor and active control method thereof |
| CN112532002B (en) * | 2020-11-12 | 2022-03-18 | 华中科技大学 | Double-stator excitation full-freedom-degree bearingless motor and active control method thereof |
| CN112865386A (en) * | 2021-03-26 | 2021-05-28 | 扬州工业职业技术学院 | Bearingless permanent magnet thin-sheet motor convenient to overhaul |
| CN116094253A (en) * | 2023-04-12 | 2023-05-09 | 苏州苏磁智能科技有限公司 | Single-winding magnetic suspension motor with magnetic protection structure and magnetic suspension equipment |
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Application publication date: 20200424 |