CN106787302B - Bearingless permanent magnet sheet motor - Google Patents

Bearingless permanent magnet sheet motor Download PDF

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Publication number
CN106787302B
CN106787302B CN201611203502.XA CN201611203502A CN106787302B CN 106787302 B CN106787302 B CN 106787302B CN 201611203502 A CN201611203502 A CN 201611203502A CN 106787302 B CN106787302 B CN 106787302B
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sheet
permanent magnet
rotor
sheet rotor
magnetic flux
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CN106787302A (en
Inventor
朱熀秋
赵祝恒
吴熙
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Jiangsu University
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Jiangsu University
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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
    • H02K1/24—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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
    • 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
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

The invention discloses a bearingless permanent magnet sheet motor.A sheet rotor is coaxially sleeved in a stator, a cylindrical magnetic flux collecting device is coaxially sleeved in the sheet rotor, and a first radial air gap is reserved between the magnetic flux collecting device and the sheet rotor; the stator consists of 6 identical L-shaped stator core columns which are uniformly distributed along the circumferential direction, and 6 radial horizontal sections form salient poles of the stator; the sheet rotor and the magnetic flux collecting device are placed in a tray opening of the sheet rotor hard plastic tray, and a second radial air gap is reserved between the sheet rotor and the inner side surface of the opening of the sheet rotor hard plastic tray; the top end of the permanent magnet is fixedly connected with the bottom surface of the thin-sheet rotor hard plastic tray, the bottom end of the permanent magnet is fixedly connected with the center of the stator iron core magnetic yoke, and the permanent magnet is magnetized along the axial direction; the axial vertical sections of the 6L-shaped stator core columns are wound with a suspension force winding and a torque winding; the salient pole ring rotor is adopted to replace the permanent magnet rotor, so that the mechanical structure of the motor is more compact, and the power density is improved.

Description

Bearingless permanent magnet sheet motor
Technical Field
The invention belongs to the field of motor manufacturing, and relates to a bearingless permanent magnet sheet motor which is suitable for various fields of sealed pumps, industrial pharmacy, life science and the like.
Background
The bearingless sheet motor is a novel motor combining magnetic suspension bearing and bearingless technology. The magnitude and direction of the levitation force of the motor can be controlled by controlling the magnitude and direction of the superposed resultant magnetic field by utilizing the combined action of two sets of different pole logarithmic windings (namely a torque winding and a levitation force winding) in the stator slot, so that the stable levitation operation of the motor rotor is realized. In addition, the bearingless permanent magnet sheet motor has a special mechanical structure, so that the axial length of the rotor is far smaller than the outer diameter of the rotor, and the bearingless permanent magnet sheet motor is sheet-shaped, and can realize passive suspension of 3 degrees of freedom (1 axial degree of freedom and 2 torsional degrees of freedom) according to the minimum magnetic resistance principle. The motor has a series of advantages of a bearingless motor, and has the characteristics of small volume, high power factor, small loss and the like.
The traditional bearingless sheet motor adopts a permanent magnet rotor, has higher cost and is not suitable for occasions of disposable use and replacement. In addition, under high temperature conditions, the magnetic force of the permanent magnet is weakened by heat generation. Under the high-speed condition, the permanent magnet rotor can be worn due to excessive centrifugal force, and various factors have influence on the working performance of the motor. In the document of Chinese patent publication No. CN204408154U, a modularized stator permanent magnet type bearingless motor is proposed, each module is composed of 1E-shaped magnetic iron core and 1 permanent magnet, the protruding teeth in the middle of the E-shaped iron core are fault-tolerant teeth, and a loop is provided for a suspension winding and an armature winding coil to realize decoupling. The permanent magnet is positioned between two adjacent E-shaped magnetic conductive 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, a levitation force winding spans across two sides of the fault-tolerant teeth to generate levitation force. Because the motor adopts a magnetic flux switching mode, the stator and rotor structure becomes complex, and the decoupling difficulty is increased. In the document of chinese patent publication No. CN 103683571a, a two-degree-of-freedom stator permanent magnet type bearingless motor is proposed, in which an E-shaped stator core limb is adopted, and two sets of windings are wound on a core in the middle of the E-shaped core limb. Two permanent magnet rings are respectively arranged in yokes at two sides of the E-shaped iron core, and the two permanent magnet magnetic fluxes and the magnetic flux of the levitation force winding are overlapped, so that larger radial levitation force is generated compared with the traditional bearingless motor. However, due to the adoption of the two annular permanent magnets, the axial length is increased, so that the motor volume is increased, and the production cost is increased.
Disclosure of Invention
The invention aims to solve the problems of the existing bearingless permanent magnet sheet motor, solve the defects of using a permanent magnet rotor in operation, simplify the rotor structure, and provide a novel bearingless permanent magnet sheet motor which has compact and simple structure and improves dynamic working performance.
The technical scheme adopted by the bearingless permanent magnet sheet motor is as follows: the magnetic flux collecting device is coaxially sleeved in the stator, and a first radial air gap is reserved between the magnetic flux collecting device and the sheet rotor; the stator consists of 6 identical L-shaped stator core columns uniformly distributed along the circumferential direction, wherein the horizontal sections of the L-shaped stator core columns are radial horizontal sections, the vertical sections are axial vertical sections, and the 6 radial horizontal sections form salient poles of the stator; the sheet rotor and the magnetic flux collecting device are placed in a tray opening of the sheet rotor hard plastic tray, the top of the tray opening is of an open structure, the bottom end of the magnetic flux collecting device is fixed in the middle of the bottom surface of the opening of the sheet rotor hard plastic tray, the inner side surface of the radial horizontal section of the L-shaped stator core column is tightly attached to the outer side surface of the opening of the sheet rotor hard plastic tray, and a second radial air gap is reserved between the sheet rotor and the inner side surface of the opening of the sheet rotor hard plastic tray; a cylindrical permanent magnet is arranged right below the thin-sheet rotor hard plastic tray, the top end of the permanent magnet is fixedly connected with the bottom surface of the thin-sheet rotor hard plastic tray, the bottom end of the permanent magnet is fixedly connected with the center of the stator iron core magnetic yoke, the permanent magnet is magnetized along the axial direction, the bottom end is an N pole, and the top end is an S pole; the outer side surface of the stator iron core magnetic yoke is tightly attached and fixedly connected with the inner side surfaces of the vertical sections of the 6L-shaped stator iron core columns; the 6 axial vertical sections of the L-shaped stator core columns are wound with a suspension force winding and a torque winding.
Further, the axial length of the horizontal sections of the 6L-shaped stator core columns is the same as the axial thickness of the magnetic flux collecting device, and is larger than the axial thickness of the sheet rotor, the top surfaces of the horizontal sections of the 6L-shaped stator core columns, the top surfaces of the magnetic flux collecting device and the top surfaces of the sheet rotor are positioned on the same radial plane, and an air gap is reserved between the bottom end of the sheet rotor and the bottom surface of the opening of the hard plastic tray of the sheet rotor.
Further, the levitation force winding and the torque winding are controlled by two three phases, U 1 ，V 1 ，W 1 Each corresponding L-shaped stator core column in the three phases has a space position difference of 120 degrees, a torque winding and a levitation force winding on each L-shaped stator core column are connected in a forward direction, and the magnetic flux of the synthesized stator winding is the sum of the magnetic fluxes of the two sets of windings; u (U) 2 ，V 2 ，W 2 Each L-shaped stator core column corresponds to one of the three phases, the spatial positions of the L-shaped stator core columns differ by 120 degrees, a torque winding and a levitation force winding on each L-shaped stator core column are connected in a reverse mode, and the magnetic flux of the synthesized stator winding is the difference between the two sets of winding magnetic fluxes.
The invention has the advantages that:
1. the salient pole ring rotor is adopted to replace the permanent magnet rotor, so that the rotor structure is simplified; the permanent magnet is arranged in the middle of the stator core column, is easy to dissipate heat, has a magnetism gathering effect, improves the robustness and dynamic performance of the system, reduces the production cost, and is suitable for high-temperature high-speed and disposable occasions.
2. The invention adopts a three-phase stator 6 pole/rotor 4 pole structure, adopts 6 iron core columns, and winds two sets of winding components on the 6 iron core columns in an upper layer and a lower layer, thereby reducing the axial length of the motor and enabling the mechanical structure of the motor to be more compact and simpler. The two sets of windings are all centralized windings, the end part is short, the loss is low, the efficiency is high, and 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, and independent control is realized.
3. In the axial control, the invention utilizes the magnetic resistance of the motor to realize the passive suspension control of three degrees of freedom of the axial translation and the forward-backward and left-right turning movement of the sheet rotor, thereby reducing the complexity of hardware and software of a digital control system; under the same power or supporting force, the axial length of the motor rotor is greatly reduced, so that the system power is larger and the levitation force is larger under the same volume.
4. The invention adopts a double three-phase connection mode on winding connection, which not only can generate stator magnetic flux identical to the traditional two independent three-phase connection modes, but also can obviously reduce copper loss, simplify the mechanical structure of the motor and improve the working performance.
Drawings
FIG. 1 is a schematic axial structure of a bearingless sheet motor of the present invention;
FIG. 2 is a schematic radial construction of a bearingless sheet motor of the present invention;
FIG. 3 is a schematic diagram of the principle of torque and radial levitation force generation of the bearingless sheet motor of the present invention;
FIG. 4 is a schematic diagram of the passive levitation principle of one axial degree of freedom of the bearingless sheet motor of the present invention;
FIG. 5 is a schematic diagram of the passive levitation principle of two degrees of torsional freedom of a bearingless sheet motor of the present invention;
fig. 6 and 7 are schematic diagrams of connection modes of torque windings and levitation force windings on a stator of a bearingless sheet motor according to the present invention.
In the figure: 1. a sheet rotor; 2. a stator core limb; 3. a magnetic flux collecting device; 4. a permanent magnet; 5. a stator core yoke; 6. a torque winding; 7. a levitation force winding; 8. a steel top plate; 9. a top hard plastic bracket; 10. a bottom hard plastic bracket; 11. a thin sheet rotor hard plastic tray; 12. a steel chassis; 13. a steel casing; 14. an air gap; 15. an air gap; 16. countersunk head screws; 31-36 displacement sensor; 41. stator winding magnetic flux; 42. permanent magnetic flux.
Detailed Description
As shown in fig. 1 and 2, the present invention has a sheet rotor 1 and a stator 2, the inner diameter of the stator 2 is larger than the outer diameter of the sheet rotor 1, and the sheet rotor 1 is coaxially sleeved in the stator 2. The sheet rotor 1 is internally coaxially sleeved with a cylindrical magnetic flux collecting device 3, and the magnetic flux collecting device 3 is made of a magnetic conductive material. The inner diameter of the sheet rotor 1 is larger than the outer diameter of the magnetic flux collecting means 3 leaving a radial air gap 15 between the magnetic flux collecting means 3 and the sheet rotor 1. The central axis of the magnetic flux collecting means 3 is the central axis of the motor.
The sheet rotor 1 adopts a 4-pole salient pole structure. The stator 2 is composed of 6 identical L-shaped stator core columns, and the 6 identical L-shaped stator core columns are uniformly distributed along the circumferential direction. The horizontal sections of the 6L-shaped stator core columns are radial horizontal sections, and the vertical section of each L-shaped stator core column is parallel to the central shaft of the motor and is an axial vertical section. The 6 radial horizontal segments form 6-pole salient poles of the stator 2, the 6-pole salient poles of the stator 2 face the salient poles of the sheet rotor 1, and the axial length of the 6-pole salient poles of the stator 2 is equal to the axial length of the magnetic flux collecting device 3.
The sheet rotor 1 and the magnetic flux collecting device 3 are arranged in the tray opening of the sheet rotor hard plastic tray 11, the top of the tray opening of the sheet rotor hard plastic tray 11 is of an open structure, and the bottom end of the magnetic flux collecting device 3 is fixed in the middle of the open bottom surface of the sheet rotor hard plastic tray 11.
Below the peripheral edge of the sheet rotor hard plastic tray 11 is a steel top plate 8, and the steel top plate 8 is embedded between the peripheral edge of the sheet rotor hard plastic tray 11 and the top surfaces of the horizontal sections of the 6L-shaped stator core columns.
The inner side surfaces of the radial horizontal sections of the 6L-shaped stator core columns are closely attached to the outer side surfaces of the openings of the hard plastic trays 11 of the thin sheet rotor. A radial air gap 14 is left between the sheet rotor 1 and the open inner side of the sheet rotor hard plastic tray 11.
The top surfaces of the horizontal sections of the 6L-shaped stator core limbs, the top surfaces of the magnetic flux collecting devices 3 and the top surfaces of the sheet rotors 1 are positioned on the same radial plane. The axial length of the horizontal sections of the 6L-shaped stator core limbs is the same as the axial thickness of the magnetic flux collecting device 3 and is larger than the axial thickness of the sheet rotor 1. An air gap is reserved between the bottom end of the sheet rotor 1 and the open bottom surface of the sheet rotor hard plastic tray 11, and the sheet rotor 1 is passively suspended in the tray opening of the sheet rotor hard plastic tray 11 through magnetic resistance.
A cylindrical permanent magnet 4 is arranged at the central shaft of the motor, and the cylindrical permanent magnet 4 is positioned right below the magnetic flux collecting device 3 and the thin-sheet rotor hard plastic tray 11 and is also positioned right in the middle of the vertical section of the stator 2. The central axis of the permanent magnet 4 is coaxial with the central axis of the magnetic flux collecting device 3, and the permanent magnet 4 is parallel with the vertical sections of the 6L-shaped stator core limbs. The top end of the permanent magnet 4 is fixedly connected with the open bottom surface of the thin-sheet rotor hard plastic tray 11, and the bottom end is fixedly connected with the center of the stator iron core yoke 5. The permanent magnet 4 is magnetized along the axial direction, the bottom end is an N pole, and the top end is an S pole. The outer side surface of the stator iron core yoke 5 is tightly attached and fixedly connected with the inner side surfaces of the vertical sections of the 6L-shaped stator iron core columns. The bottom ends of the stator iron core yokes 5 and the bottom ends of the 6L-shaped stator iron core columns are positioned on the same radial plane, and the bottom ends of the stator iron core yokes 5 and the bottom ends of the 6L-shaped stator iron core columns are fixedly connected on the steel chassis 12 together.
The open inner diameter of the sheet rotor hard plastic tray 11 is smaller than the outer diameter of the stator core yoke 5. The outer diameter of the permanent magnet 4 is smaller than the outer diameter of the magnetic flux collecting means 3.
Two sets of stator windings, namely a levitation force winding 7 and a torque winding 6, are wound on the axial vertical sections of the 6L-shaped stator core limbs and are respectively used for forming radial levitation force and electromagnetic torque required by motor operation.
The steel casing 13 is arranged on the outer side of the 6L-shaped stator iron core columns in the axial direction, the steel casing 13 is cylindrical, the bottom end of the steel casing 13 is fixedly connected with the steel chassis 12 through the countersunk head screw 16, the top end of the steel casing 13 is fixedly connected with the steel top disc 8 through the countersunk head screw 16, and the steel casing 13 is used for protecting the inside of the motor and plays a role in heat dissipation.
A top hard plastic support 9 is embedded at the top of a gap between each L-shaped stator core column and the steel shell 13, a bottom hard plastic support 10 is embedded at the bottom of the gap, the top end of the top hard plastic support 9 is fixed on the steel top disc 8, and the bottom end of the bottom hard plastic support 10 is fixed on the steel bottom disc 12. A displacement sensor is fixed in each top hard plastic bracket 9, and six displacement sensors are respectively displacement sensors 31, 32, 33, 34, 35 and 36, as shown in fig. 2, so that the six displacement sensors are uniformly distributed around the sheet rotor 1 along the circumference and are used for detecting the radial displacement of the sheet rotor 1 in the running process of the motor, and the radial distance between each displacement sensor and the sheet rotor 1 is the same.
Fig. 3 is a schematic diagram of the principle of torque and radial levitation force generation of the present invention, which is similar to the principle of levitation force generation of a permanent magnet biased active magnetic bearing, namely, magnetic flux generated by stator winding current at an air gap of a stator and a rotor has an effect of strengthening or weakening bias magnetic flux generated by a permanent magnet, so that magnetic flux unbalance at two symmetrical air gaps is caused, and radial levitation force is formed. The permanent magnet 4 is axially arranged, the generated permanent magnet flux 42 starts from the permanent magnet 4 and enters the stator core yoke 5 in two paths, then enters the sheet rotor 1 through the L-shaped stator core limb and the air gap 15, and finally returns to the permanent magnet 4 after being collected in the magnetic flux collecting device 3 through the air gap 14. The stator winding magnetic flux 41 generated by the combined action of the torque winding 6 and the levitation force winding 7 flows along the L-shaped stator core limb, the air gap 15, and the sheet rotor 1, and finally returns to the L-shaped stator core limb. Due to the salient pole ring structure of the sheet rotor 1, the stator winding magnetic flux 41 flow path does not pass through the magnetic flux collecting device 3 and the permanent magnet 4, enters from one end salient pole of the sheet rotor 1, and directly flows out from the adjacent salient pole. Marked in fig. 3xShaft and method for producing the sameyThe plane of the shaft is perpendicular to the central axis of the permanent magnet 4, inxThe permanent magnetic flux 42 at the stator-rotor air gap 14 in the axial negative direction has the same direction as the stator winding magnetic flux 41, and the synthesized magnetic flux is enhanced; at the position ofxThe permanent magnetic flux 42 and the stator winding flux 41 at the air gap 14 in the positive direction of the shaft are in opposite directions, and the resultant flux is weakened, thus creating a magnetic flux having the direction ofxSuspension force in axial negative directionF. In the same way, can obtainyAnd a levitation force in the direction.
Due to the salient pole structure of the sheet rotor 1, the permanent magnetic flux 42 generated by the permanent magnets 4 also changes due to the change in the salient pole position of the sheet rotor 1 during the rotation of the sheet rotor 1, thereby forming a stator induced back electromotive force in the stator windings. According to the angular position of the sheet rotor 1, a stator winding current in phase with the stator induced back electromotive force is applied to each phase of stator winding, and the corresponding electromagnetic torque can be obtained.
Referring to fig. 4 and 5, the permanent magnetic flux 42 generated by the permanent magnet 4 is split into two paths by the flux collecting device 3, and enters the air gap 15, the sheet rotor 1, the air gap 14 and the l-shaped stator core limb, and finally returns to the permanent magnet 4, thereby achieving the passive levitation with 3 degrees of freedom. Fig. 4 is a schematic diagram of passive levitation in an axial degree of freedom, wherein when the sheet rotor 1 is axially displaced according to the principle of magnetic resistance minima, the magnetic resistance will maintain the minimum air gap length by restoring the sheet rotor 1 to the original position, thereby moving the sheet rotor 1 in the opposite direction of the displacement, and finally returning to the equilibrium position. Fig. 5 is a schematic diagram of passive levitation with two degrees of torsion freedom, and since the axial length of the sheet rotor 1 of the sheet motor is much smaller than the radial diameter, when the sheet rotor 1 is twisted back and forth, left and right, the detent force on the sheet rotor 1 will also act in opposite directions, returning the sheet rotor 1 to the equilibrium position.
Referring to fig. 6 and 7, since the stator 2 is composed of 6L-shaped stator core limbs, it can be controlled by being divided into two three phases. The traditional three-phase control method is to separate a torque winding and a levitation force winding, and control the torque winding and the levitation force winding by taking two sets of windings on two symmetrical stator core limbs as one phase. The method can be used for independently designing the torque winding and the levitation force winding, but the connection is complex, and meanwhile, as the two three phases are connected in a star-shaped manner, a common mode current can be generated in the stator winding to cause interference and unnecessary loss to the system. Therefore, the invention adopts a double three-phase structureIs connected with the connecting mode of the connecting device. Referring to FIG. 6, the three phases are U respectively 1 ，V 1 ，W 1 Each phase corresponds to only one L-shaped stator core limb, the space positions of the L-shaped stator core limbs are 120 degrees different, the torque winding 6 and the levitation force winding 7 on each L-shaped stator core limb are connected in the forward direction, the composite stator winding magnetic flux 41 is the sum of two sets of winding magnetic fluxes, and the direction of the composite stator winding magnetic flux 41 is shown by an arrow in fig. 6 and points to the sheet rotor 1. Referring to FIG. 7, the three phases are U respectively 2 ，V 2 ，W 2 Each phase corresponds to only one L-shaped stator core limb, the space positions are 120 degrees different, the torque winding 6 and the levitation force winding 7 on each L-shaped stator core limb are reversely connected, the synthesized stator winding magnetic flux 41 is the difference between two sets of winding magnetic fluxes, and the direction of the synthesized stator winding magnetic flux 41 is shown by an arrow in fig. 7 and points to the sheet rotor 1; the two groups of three phases are all connected by adopting a star type. The connection mode solves the problem caused by common mode current, simplifies the mechanical structure of the motor, greatly reduces copper loss and improves the motor performance.

Claims (4)

1. The utility model provides a bearingless permanent magnet sheet motor, has sheet rotor (1) and stator (2), and sheet rotor (1) coaxial sleeve is in stator (2), characterized by: a cylindrical magnetic flux collecting device (3) is coaxially sleeved in the sheet rotor (1), and a first radial air gap (15) is reserved between the magnetic flux collecting device (3) and the sheet rotor (1); the stator (2) consists of 6 identical L-shaped stator core columns uniformly distributed along the circumferential direction, wherein the horizontal sections of the L-shaped stator core columns are radial horizontal sections, the vertical sections are axial vertical sections, and the 6 radial horizontal sections form salient poles of the stator (2); the sheet rotor (1) and the magnetic flux collecting device (3) are placed in a tray opening of the sheet rotor hard plastic tray (11), the top of the tray opening is of an open structure, the bottom end of the magnetic flux collecting device (3) is fixed in the middle of the bottom surface of the opening of the sheet rotor hard plastic tray (11), the inner side surface of the radial horizontal section of the L-shaped stator core column is tightly attached to the outer side surface of the opening of the sheet rotor hard plastic tray (11), and a second radial air gap (14) is reserved between the sheet rotor (1) and the inner side surface of the opening of the sheet rotor hard plastic tray (11); a cylindrical permanent magnet (4) is arranged right below the thin-sheet rotor hard plastic tray (11), the top end of the permanent magnet (4) is fixedly connected with the bottom surface of the thin-sheet rotor hard plastic tray (11), the bottom end of the permanent magnet is fixedly connected with the center of the stator iron core yoke (5), the permanent magnet (4) is magnetized along the axial direction, the bottom end is an N pole, and the top end is an S pole; the outer side surface of the stator iron core yoke (5) is tightly attached and fixedly connected with the inner side surfaces of the vertical sections of the 6L-shaped stator iron core columns; the axial vertical sections of the 6L-shaped stator iron core columns are wound with a suspension force winding (7) and a torque winding (6);
the levitation force winding (7) and the torque winding (6) are divided into two three-phase control, U 1 ，V 1 ，W 1 Each corresponding L-shaped stator core column in the three phases has a space position difference of 120 degrees, a torque winding (6) and a levitation force winding (7) on each L-shaped stator core column are connected in a forward direction, and the magnetic flux of the synthesized stator winding is the sum of the magnetic fluxes of the two sets of windings; u (U) 2 ，V 2 ，W 2 Each L-shaped stator core column corresponds to one of the three phases, the spatial positions are 120 degrees different, a torque winding (6) and a levitation force winding (7) on each L-shaped stator core column are reversely connected, and the magnetic flux of the synthesized stator winding is the difference between two sets of winding magnetic fluxes;
the axial length of the horizontal sections of the 6L-shaped stator core columns is the same as the axial thickness of the magnetic flux collecting device (3), and is larger than the axial thickness of the thin sheet rotor (1), the top surfaces of the horizontal sections of the 6L-shaped stator core columns, the top surfaces of the magnetic flux collecting device (3) and the top surfaces of the thin sheet rotor (1) are positioned on the same radial plane, and an air gap is reserved between the bottom end of the thin sheet rotor (1) and the open bottom surface of the thin sheet rotor hard plastic tray (11);
the inner diameter of the opening of the sheet rotor hard plastic tray (11) is smaller than the outer diameter of the stator iron core yoke (5), and the outer diameter of the permanent magnet (4) is smaller than the outer diameter of the magnetic flux collecting device (3).
2. The bearingless permanent magnet sheet motor of claim 1, wherein: a steel top disc (8) is arranged below the peripheral edge of the sheet rotor hard plastic tray (11), and the steel top disc (8) is embedded between the peripheral edge of the sheet rotor hard plastic tray (11) and the top surfaces of the horizontal sections of the 6L-shaped stator iron core columns; the bottom ends of the stator iron core yokes (5) and the bottom ends of the 6L-shaped stator iron core columns are fixedly connected with a steel chassis (12) together.
3. A bearingless permanent magnet sheet motor as set forth in claim 2 wherein: the steel shell (13) is arranged on the outer side of the 6L-shaped stator iron core columns in the axial direction, the bottom end of the steel shell (13) is fixedly connected with the steel bottom plate (12), and the top end of the steel shell (13) is fixedly connected with the steel top plate (8).
4. A bearingless permanent magnet sheet motor according to claim 3, wherein: a displacement sensor is arranged in each top hard plastic bracket (9).
CN201611203502.XA 2016-12-23 2016-12-23 Bearingless permanent magnet sheet motor Active CN106787302B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109347226B (en) * 2018-10-25 2020-09-25 江苏大学 Bearingless permanent magnet sheet motor
CN111064331A (en) * 2019-12-23 2020-04-24 江苏大学 Bearingless permanent magnet sheet motor with double-stator structure
CN116094253B (en) * 2023-04-12 2023-07-11 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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CN103023265A (en) * 2012-12-28 2013-04-03 江苏大学 Bearingless permanent magnet slice motor
CN206524695U (en) * 2016-12-23 2017-09-26 江苏大学 A kind of bearing-free permanent magnet thin-sheet motor

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CN103023265A (en) * 2012-12-28 2013-04-03 江苏大学 Bearingless permanent magnet slice motor
CN206524695U (en) * 2016-12-23 2017-09-26 江苏大学 A kind of bearing-free permanent magnet thin-sheet motor

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