CN115459489A - Passive diamagnetic suspension motor - Google Patents
Passive diamagnetic suspension motor Download PDFInfo
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- CN115459489A CN115459489A CN202211159848.XA CN202211159848A CN115459489A CN 115459489 A CN115459489 A CN 115459489A CN 202211159848 A CN202211159848 A CN 202211159848A CN 115459489 A CN115459489 A CN 115459489A
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- 239000000725 suspension Substances 0.000 title claims abstract description 157
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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
- H02K1/274—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
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- 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
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a passive diamagnetic suspension motor which comprises a suspension rotor, a permanent magnet synchronous driving system, a suspension magnet array and a support frame, wherein the suspension rotor is arranged on the support frame; the suspension rotor part comprises a permanent magnet rotor, a suspension turntable, an axial suspension permanent magnet, a rotating shaft and a shaft sleeve. The permanent magnet synchronous driving system comprises a coil winding and a first support, wherein three-phase current is introduced into the coil winding to generate a rotating magnetic field which is coupled with a permanent magnet rotor magnetic field so as to drive the motor rotor to rotate; the suspension magnet array comprises an upper suspension magnet array, a lower suspension magnet array, a permanent magnet array and a second support, wherein the permanent magnet array is arranged on the second support, and axial suspension force is provided for the suspension rotor, so that the suspension rotor part can be passively and stably suspended. The passive diamagnetic suspension motor overcomes the defect of small rotating torque caused by small electrostatic force of a diamagnetic suspension electrostatic motor, improves the driving capability of the motor, and solves the problem of low limit rotating speed caused by insufficient driving torque of electrostatic driving.
Description
Technical Field
The invention discloses a novel passive diamagnetic suspension motor, and belongs to the field of motors.
Background
Micro-electro-mechanical system (MEMS) integrates Micro-mechanics and Micro-electronic functions, is widely applied to high and new technology industries such as Micro-electronics, aerospace, sensors, actuators and the like, and is a key technology related to national science and technology development, economic prosperity and national defense safety. With the continuous development of the MEMS technology, the micro motor has become the core device of energy conversion, function driving, and precision control in the MEMS system, and has dual functions of precision driving and control in the key fields of micro-robot, micro-satellite, biomedical, etc.
Diamagnetic levitation is a technology for stabilizing levitation in a magnetic field by utilizing the diamagnetism of diamagnetic substances, and was originally discovered in 18 years, but researchers have not conducted intensive research on diamagnetic levitation at that time because the diamagnetic force itself is very weak. Until the last 30 years, with the development of microfabrication and high-intensity magnetic field technology, research and application related to anti-magnetic levitation have not started to emerge. The anti-magnetic suspension is not limited by Earnshaws' theorem, and can realize normal-temperature, passive, friction-free and static stable suspension. The ratio of the diamagnetic suspension force to the gravity of the suspended matter is positively correlated with the surface area of the suspended matter, so that the ratio of the suspension force to the gravity of the suspended matter is increased along with the reduction of the scale under the scale effect, and the rotor has great application prospect in miniature rotors.
At present, diamagnetic suspension motors are mainly divided into two types according to the driving principle: the motor realizes real stator and rotor contactless driving, and has small volume and high power density. However, the torque is small due to the adoption of the interaction force between the induction charges for driving, and the method is mainly applied to the fields of micro gyros and the like. On the premise that the rotor is passively suspended, the driving scheme of the traditional permanent magnet synchronous motor is adopted, and the purpose of rotating the rotor attached with the permanent magnet is achieved by driving the rotor attached with the permanent magnet through the coil winding. Compared with an electrostatic motor, the motor has larger volume, but the torque of the motor is larger than that of the electrostatic motor, and the motion of a rotor can be easily controlled only by controlling the amplitude and the phase of the current of a coil winding.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a novel passive diamagnetic suspension synchronous motor aiming at the defects that the torque of the existing electrostatic motor is smaller and the power is difficult to transmit outwards.
The technical scheme is as follows:
a passive diamagnetic suspension motor comprises a suspension rotor, a permanent magnet synchronous driving system, a suspension magnet array and a support frame, wherein the suspension rotor comprises a permanent magnet rotor, a suspension turntable, an axial suspension permanent magnet, a rotating shaft and a shaft sleeve; the permanent magnet synchronous driving system comprises a coil winding and a first support, wherein the suspension magnet array comprises an upper suspension magnet array, a lower suspension magnet array, a permanent magnet array and a second support; the support frame comprises a support base and an axial support rod; the permanent magnet rotor comprises N magnetic shoes which are fixedly spliced on the rotating shaft, N is an even number larger than 4, the magnetic shoes have two magnetizing directions which are radially outward magnetizing and radially inward magnetizing respectively, the magnetizing directions of the permanent magnet magnetic shoes in opposite directions are consistent, and the magnetizing directions of the permanent magnet magnetic shoes in adjacent directions are opposite; a coil winding is arranged outside the circumference of the permanent magnet rotor and fixed on the first support, the coil winding has three phases, 3-phase sinusoidal alternating current is sequentially introduced, the three phases have the same frequency and amplitude, the phases sequentially lag behind by 120 degrees to form a rotating magnetic field and are coupled with the magnetic field of the permanent magnet rotor so as to drive the permanent magnet rotor to synchronously rotate; since the three-phase power is a sinusoidal signal and has a sequential hysteresis relationship, a rotating traveling magnetic field wave is formed in the winding. Similar to a traditional permanent magnet synchronous motor, when the polarity of a rotating magnetic field is the same as that of a permanent magnet magnetic shoe on a rotor, repulsion is generated, and when the polarity of the rotating magnetic field is the same as that of the magnetic shoe, attraction is generated, and at the moment, the rotor receives unbalanced torque and starts to rotate. Because the magnetic field of the excitation winding is in a state of continuous rotation, the rotor can be synchronously driven to rotate, and the purpose of driving is achieved; the suspension turntable is in a circular sheet shape and is made of diamagnetic materials, the permanent magnet array is in annular Halbach arrangement and is fixedly arranged on a second support below the suspension turntable and opposite to the suspension turntable, and a suspension air gap is formed between the suspension turntable and the suspension turntable during operation so as to provide axial suspension force for the suspension turntable; the axial suspension permanent magnets are cylindrical, the two axial suspension permanent magnets are arranged at two ends of the rotating shaft through the shaft sleeve, the two axial suspension permanent magnets have the same polarity with the connecting end of the shaft sleeve, for example, the S pole of the axial suspension permanent magnet above the rotating shaft faces upwards, the N pole of the axial suspension permanent magnet above the rotating shaft faces downwards, and the N pole of the axial suspension permanent magnet below the rotor faces upwards and the S pole of the axial suspension permanent magnet below the rotor faces downwards; the upper suspension magnet array and the lower suspension magnet array respectively comprise a disc-shaped support and M columnar permanent magnets, the side surface of the disc-shaped support is uniformly provided with M cylindrical through holes which are radially arranged and used for mounting the M columnar permanent magnets, M is an even number more than 4, and the polarity of the center direction of the M columnar permanent magnets is the same as that of the shaft sleeve connecting end of the axial suspension permanent magnet (3); if the installation mode is that the N pole faces the direction of the circle center, the S pole faces the circumferential direction and is in clearance fit with the through hole, and fixing glue is filled in the middle of the through hole, so that the permanent magnets are firmly adhered; the upper suspension magnet array and the lower suspension magnet array play a role in providing upward axial force for the rotor and improving radial rigidity, and the motor is prevented from being unstable under the condition of high rotating speed; the rotating shaft sequentially penetrates through the through holes in the circle centers of the suspension rotating disc, the second support and the permanent magnet rotor from top to bottom and is fixed with the permanent magnet rotor and the suspension rotating disc, a gap is reserved between the rotating shaft and the through holes in the circle centers of the second support, a cylindrical through hole is formed in the circle centers of the disc-shaped support of the upper suspension magnet array and the disc-shaped support of the lower suspension magnet array, the upper end of the axial suspension permanent magnet above the rotating shaft and the lower end of the axial suspension permanent magnet below the rotating shaft are located in the cylindrical through hole, and a gap is reserved between the upper end of the axial suspension permanent magnet above the rotating shaft and the lower end of the axial suspension permanent magnet below the rotating shaft and the circumference of the through hole; the axial support rod is fixed on the support base, mounting holes are formed in the disc-shaped support, the first support and the second support, and the disc-shaped support of the upper suspension magnet array, the first support, the second support and the lower suspension magnet array are fixed on the axial support rod through the mounting holes by the axial support rod.
Furthermore, the permanent magnet array is formed by nesting and splicing four permanent magnet rings with different magnetizing directions, wherein the magnetizing directions of the permanent magnets from inside to outside are respectively axially upward, radially inward, axially downward and radially outward, and ten circles are circularly arranged; the permanent magnets which are magnetized upwards and downwards in the axial direction form the lowest point of magnetic potential energy in the axial direction, so that the diamagnetic graphite rotor can stably suspend in the axial direction. The permanent magnet magnetized in the radiation direction plays a role in magnetism gathering, so that the radial rigidity of the rotor in passive suspension is improved, and the stability of the rotor in the suspension and rotation processes is further improved.
Furthermore, the circle centers of the suspension turntable and the permanent magnet array are concentric in the vertical direction, the peripheral edge of the suspension turntable coincides with the junction of the eighth magnetic ring and the ninth magnetic ring, the suspension turntable is guaranteed to be located at the lowest point of magnetic potential energy of a magnetic field formed by the permanent magnet array, the magnetic conductivity of the pyrolytic graphite is very low, stable suspension of the rotor without external energy can be achieved according to the anti-magnetic suspension principle, and meanwhile, the rotor has certain radial rigidity and certain axial rigidity.
Further, the number N of the permanent magnet rotor magnetic shoes is 4.
Furthermore, the disk-shaped bracket is provided with 8 through holes, and the number of the permanent magnets is 8
Further, the diamagnetic material suspending the rotor may be pyrolytic graphite.
Furthermore, the disc-shaped support in the suspension magnet array is an acrylic plate.
Furthermore, the rotating shaft and the second support are made of ABS materials. The second support is made of ABS materials, and magnetic circuit coupling with the permanent magnet array is avoided; the rotating shaft is made of ABS (acrylonitrile butadiene styrene), and ABS plastic is a tough, hard and rigid material which is easy to obtain raw materials, good in comprehensive performance, low in price and wide in application, and can reduce the mass of the rotor on the premise of ensuring that the rigidity of the rotor is greatly improved.
Further, the rotating shaft is of a hollow structure.
Further, the number of the axial support rods is four.
Has the advantages that:
the active rotation function of the anti-magnetic suspension motor is realized.
(1) The ratio of the diamagnetic suspension force to the rotor gravity of the diamagnetic suspension motor is in positive correlation with the surface area of the rotor, so that the ratio of the suspension force to the rotor gravity is increased along with the reduction of the scale under the scale effect, and the miniaturization of the motor can be realized.
(2) The anti-magnetic suspension is not limited by Earnshaws' theorem, and can realize normal-temperature, passive, friction-free and static stable suspension without any energy input.
(3) An annular levitating magnetic field is provided, and eddy current loss during rotation of the rotor is reduced.
(4) The defect of small rotating torque caused by small electrostatic force of the anti-magnetic suspension electrostatic motor is overcome, and the driving capability of the motor is improved.
(5) The defects that the limit rotating speed is low due to insufficient driving torque of electrostatic driving, and performance fluctuation is caused because the electrical property of the material is sensitive to environmental factors such as temperature, humidity and the like are overcome.
(6) The rotating speed of the motor can be changed only by adjusting the amplitude and the frequency of three-phase power in the driving coil, and the motor is simple to control and sensitive in response.
Drawings
FIG. 1 is a schematic view of a structure of a synchronous motor with magnetic levitation resistance;
FIG. 2 illustrates a sectional structure of a Halbach permanent magnet array and a suspension rotor;
FIG. 3 is a schematic view of the magnetizing direction of a Halbach permanent magnet array;
FIG. 4 is a schematic diagram of a 3D model of a lowest point of magnetic potential energy;
FIG. 5 is a schematic diagram of a permanent magnet synchronous drive system;
FIG. 6 (a) is a schematic diagram of an upper levitating magnet array, and FIG. 6 (b) is a schematic diagram of a lower levitating magnet array;
fig. 7 is a top view of the motor levitation magnet array structure.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
the passive diamagnetic levitation motor shown in fig. 1 comprises a levitation rotor, a permanent magnet synchronous driving system, a levitation magnet array and a support frame. The suspension rotor part comprises a permanent magnet rotor 1, a suspension turntable 2, an axial suspension permanent magnet 3, a rotating shaft 4 and a shaft sleeve 5, and all the parts are fixedly connected. The permanent magnet synchronous driving system comprises a coil winding 6 and a first support 7, wherein a three-phase current is introduced into the winding to generate a rotating magnetic field, and the rotating magnetic field is coupled with a permanent magnet rotor magnetic field so as to drive the motor rotor to rotate. The suspension magnet array comprises an upper suspension magnet array 8, a lower suspension magnet array 9, a permanent magnet array 10 and a second support 11, wherein the permanent magnet array 10 is an annular Halbach permanent magnet array which is nested and placed on the second support 11, and the second support 11 is made of an acrylic material and provides axial suspension force for the suspension rotor, so that the suspension rotor part can be passively and stably suspended; go up suspension magnet array and lower part suspension magnet array and pass through the bracing piece to be fixed on supporting the base, play the auxiliary stay effect for rotor axial suspension. Because the rotor is in passive suspension, the function of motor rotation can be realized only by introducing driving current to the winding.
Fig. 2 is a sectional structure diagram of a passive anti-magnetic levitation motor Halbach magnet array and a levitation rotor. The specific magnetizing directions of the magnetic rings in the magnet array are shown in a sectional view of fig. 3, the Halbach magnet array is formed by nesting and splicing four permanent magnet rings with different magnetizing directions, the magnetizing directions of the permanent magnets from inside to outside are respectively axial upward, radial inward, axial downward and radial outward, and ten circles are circularly arranged. The permanent magnets which are magnetized in the axial direction upwards and downwards form the lowest point of magnetic potential energy in the axial direction, so that the diamagnetic graphite rotor can stably suspend in the axial direction, the permanent magnets which are magnetized in the radiation direction play a role in magnetism gathering, the radial rigidity of the rotor during passive suspension is further improved, and the stability of the rotor in the suspension and rotation processes is further improved. The permanent magnet array 10 is fixedly arranged on the second support 11 and is opposite to the suspension turntable 2, and a suspension air gap is formed between the permanent magnet array and the suspension turntable 2 during operation so as to provide axial suspension force for the suspension turntable; the second support 11 is made of ABS plastic to avoid magnetic coupling with the permanent magnet array.
A suspension disk 2 is placed above the permanent magnet array 10, and the suspension disk 2 is made of diamagnetic material and can be made of pyrolytic graphite. The circle center of the suspension turntable 2 is concentric with the circle center of the permanent magnet array 10 in the vertical direction. As shown in fig. 4, an analytic expression of magnetic potential energy of the HALBACH magnet array is established, and three-dimensional mapping is performed, and it can be seen from the figure that the lowest point of magnetic potential energy is located at a position a and at a junction of the eighth magnetic ring and the ninth magnetic ring. According to the diamagnetic suspension mechanism, when the peripheral edge of the suspension turntable 2 is superposed with the junction of the eighth magnetic ring and the ninth magnetic ring, the graphite rotor is positioned at the lowest point of magnetic potential energy of a magnetic field formed by the permanent magnet array, the suspension can be stabilized, and certain radial and axial rigidity is achieved.
The permanent magnet synchronous driving system consists of a permanent magnet rotor and a coil winding. As shown in fig. 5, the permanent magnet rotor includes four 1/4 circular magnetic shoes, the four magnetic shoes are fixedly spliced on the ABS bar, and the magnetic shoes have two magnetizing directions, namely radially outward magnetizing and radially inward magnetizing. When the permanent magnet rotors are spliced, the magnetizing directions of the permanent magnet magnetic shoes in opposite directions are consistent, and the magnetizing directions of the permanent magnet magnetic shoes in adjacent directions are opposite. A coil winding 6 is arranged outside the circumference of the permanent magnet rotor 1, the coil winding 6 is fixed on a first support 7, the coil winding 6 has three phases, and 3-phase sinusoidal alternating currents V1, V2 and V3 are sequentially introduced into the coil winding 6. The three-phase power V1, V2 and V3 has the same frequency and amplitude, but the phases are sequentially lagged by 120 degrees to form a rotating magnetic field and are coupled with the magnetic field of the permanent magnet rotor, so that the rotor is driven to synchronously rotate. Since the three-phase power is sinusoidal and has a sequential lag relationship, a rotating traveling magnetic field wave is formed in the winding. Similar to the conventional permanent magnet synchronous motor, when the polarity of the rotating magnetic field is the same as that of the permanent magnet magnetic shoe on the rotor, repulsion is generated, and when the polarity of the rotating magnetic field is the same as that of the magnetic shoe, attraction is generated, and at the moment, the rotor receives unbalanced torque and starts to rotate. Because the magnetic field of the excitation winding is in a continuous rotating state, the rotor can be synchronously driven to rotate, and the purpose of driving is achieved
As shown in fig. 6 (a) and 6 (b), the upper suspension magnet array and the lower suspension magnet array structure serve to provide an upward axial force to the rotor and improve radial rigidity, and prevent the motor from being unstable at high rotation speed, wherein the upper suspension magnet array is formed by mounting 8 columnar permanent magnets 15 which are magnetized along the axial direction on an ABS disk-shaped bracket 14. As shown in FIG. 7, the bracket is disc-shaped, and has 8 cylindrical through holes arranged radially on its side for mounting 8 columnar permanent magnets 15And 8 cylindrical through holes are symmetrically distributed at equal intervals. The installation mode of the columnar permanent magnet 15 is that the N pole is inward, the S pole is outward, the columnar permanent magnet and the through hole are in clearance fit, and fixing glue is filled in the middle of the columnar permanent magnet, so that the permanent magnet is firmly adhered. Simultaneously, 2 cylindrical axial suspension permanent magnets 3 are arranged at two ends of a rotating shaft 4 through shaft sleeves 5, the rotating shaft 4 is of a hollow structure, the S pole of the axial suspension permanent magnet above the rotating shaft 4 faces upwards, the N pole of the axial suspension permanent magnet below the rotating shaft 4 faces downwards, and the N pole of the axial suspension permanent magnet below the rotating shaft 4 faces upwards and the S pole of the axial suspension permanent magnet below the rotating shaft faces downwards. Because the magnetic poles attract in different directions and repel in the same direction, an interaction force is generated between the axial suspension permanent magnet 3 fixed on the rotor and the columnar permanent magnet 15 on the disc-shaped bracket 12. The resultant force borne by the axial suspension permanent magnet is decomposed into component forces in the X and Y directions. Since the columnar permanent magnets 15 on the disc-shaped bracket 12 are all symmetrically arranged, F x Resultant force is 0, only F is present y And F is y In the upward direction, the rotating shaft 4 also plays a certain axial supporting role. The suspension magnet array generates an upward resultant force Fy to the permanent magnet on the rotating shaft 4, so that the rotor is axially supported, the radial rigidity is increased, and the instability of the motor in a high-speed state is avoided.
The rotating shaft 4 sequentially penetrates through the through holes in the circle centers of the suspension turntable 2, the second support 11 and the permanent magnet rotor 1 from top to bottom and is fixed with the permanent magnet rotor and the suspension turntable 2, a gap is reserved between the through holes and the circle center of the second support 11, a cylindrical through hole is formed in the circle centers of the disc-shaped support 14 of the upper suspension magnet array 1 and the disc-shaped support 14 of the lower suspension magnet array 2, the upper end of the axial suspension permanent magnet 3 above the rotating shaft 4 and the lower end of the axial suspension permanent magnet 3 below the rotating shaft 4 are located in the cylindrical through hole, and a gap is reserved between the upper end of the axial suspension permanent magnet 3 above the rotating shaft 4 and the circumference of the through hole;
four axial support rods 13 are fixed on the support base 12, mounting holes are formed in the disc-shaped support 14, the first support 7 and the second support 11, and the axial support rods 11 fix the disc-shaped support 12 of the upper suspension magnet array 8, the first support 7, the second support 11 and the disc-shaped support 12 of the lower suspension magnet array 9 on the axial support rods 13 through the mounting holes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A passive diamagnetic suspension motor is characterized by comprising a suspension rotor, a permanent magnet synchronous driving system, a suspension magnet array and a support frame, wherein the suspension rotor comprises a permanent magnet rotor (1), a suspension turntable (2), an axial suspension permanent magnet (3), a rotating shaft (4) and a shaft sleeve (5); the permanent magnet synchronous driving system comprises a coil winding (6) and a first support (7), wherein the suspension magnet array comprises an upper suspension magnet array (8), a lower suspension magnet array (9), a permanent magnet array (10) and a second support (11); the support frame comprises a support base (12) and an axial support rod (13); the permanent magnet rotor (1) comprises N fan-shaped magnetic shoes which are fixedly spliced on the rotating shaft (4), N is an even number larger than 4, the magnetic shoes have two magnetizing directions which are respectively radially outward magnetizing and radially inward magnetizing, the magnetizing directions of the permanent magnet magnetic shoes in opposite directions are consistent, and the magnetizing directions of the permanent magnet magnetic shoes in adjacent directions are opposite; a coil winding (6) is arranged outside the circumference of the permanent magnet rotor (1), the coil winding (6) is fixed on a first support (7), the coil winding (6) has three phases, 3-phase sinusoidal alternating current is sequentially introduced, the three phases have the same frequency and amplitude, the phases are sequentially lagged by 120 degrees to form a rotating magnetic field and are coupled with the magnetic field of the permanent magnet rotor (1), and the permanent magnet rotor (1) is driven to synchronously rotate; the suspension turntable (2) is in a circular sheet shape and is made of diamagnetic materials, the permanent magnet array (10) is arranged in an annular Halbach shape and is fixedly arranged on a second support (11) below the suspension turntable (2) and opposite to the suspension turntable (2), and a suspension air gap is formed between the suspension turntable (2) and the permanent magnet array during operation; the axial suspension permanent magnets (3) are cylindrical, the two axial suspension permanent magnets (3) are arranged at two ends of the rotating shaft (4) through shaft sleeves (5), and the polarities of the connecting ends of the two axial suspension permanent magnets (3) and the shaft sleeves (5) are the same; the upper suspension magnet array (8) and the lower suspension magnet array (9) respectively comprise a disc-shaped support (14) and M columnar permanent magnets (15), M cylindrical through holes which are radially arranged are uniformly formed in the side surface of the disc-shaped support (12) and used for mounting the M columnar permanent magnets (15), M is an even number which is larger than 4 and is in clearance fit with the through holes, fixing glue is filled in the middle of the cylindrical through holes to ensure that the permanent magnets are firmly adhered, and the polarity of the circle center direction of the M columnar permanent magnets is the same as that of the shaft sleeve connecting end of the axial suspension permanent magnet (3); the rotating shaft (4) sequentially penetrates through the through holes in the circle centers of the suspension turntable (2), the second support (11) and the permanent magnet rotor (1) from top to bottom and is fixed with the permanent magnet rotor and the suspension turntable (2), a gap is reserved between the rotating shaft and the through holes in the circle centers of the second support (11), cylindrical through holes are formed in the circle centers of the disc-shaped support (14) of the upper suspension magnet array (1) and the disc-shaped support (14) of the lower suspension magnet array (2), the upper end of the axial suspension permanent magnet (3) above the rotating shaft (4) and the lower end of the axial suspension permanent magnet (3) below the rotating shaft (4) are located in the cylindrical through holes and have a gap with the circumference of the through holes; the axial support rod (13) is fixed on the support base (12), mounting holes are formed in the disc-shaped support (14), the first support (7) and the second support (11), and the disc-shaped support (12) of the upper suspension magnet array (8), the first support (7), the second support (11) and the disc-shaped support (12) of the lower suspension magnet array (9) are fixed on the axial support rod (13) through the mounting holes in the axial support rod (11).
2. A passive anti-magnetic suspension motor according to claim 1, wherein the permanent magnet array is arranged in a ring-shaped Halbach manner by nesting and splicing four permanent magnet rings with different magnetizing directions, the magnetizing directions of the permanent magnets from inside to outside are respectively axially upward, radially inward, axially downward and radially outward, and ten circles are circularly arranged.
3. A passive anti-magnetic suspension motor according to claim 1, wherein the center of the suspension turntable (2) is vertically concentric with the center of the permanent magnet array (10), and the peripheral edge of the suspension turntable (2) coincides with the junction of the eighth magnetic ring and the ninth magnetic ring.
4. A passive anti-magnetic levitation motor as recited in claim 1, wherein the number N of permanent magnet rotor tiles is 4.
5. A passive anti-magnetic levitation motor as claimed in claim 1, wherein the disc-shaped holder (14) has 8 through holes and 8 permanent magnets.
6. A passive anti-magnetic levitation motor as recited in claim 1, wherein the anti-magnetic material of the levitation rotor can be pyrolytic graphite.
7. A passive anti-magnetic levitation motor as recited in claim 1, wherein the disc-shaped holder (14) in the levitation magnet array is an acrylic plate.
8. A passive anti-maglev motor according to claim 1, wherein the shaft (4) and the second support (3) are made of ABS.
9. A passive anti-magnetic levitation motor as claimed in claim 1, wherein the rotating shaft (4) is of hollow construction.
10. A new passive anti-magnetic levitation motor as claimed in claim 1, characterized in that the number of axial support bars (13) is four.
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| CN112953309A (en) * | 2021-03-17 | 2021-06-11 | 槃实科技(深圳)有限公司 | Permanent magnet synchronous magnetic suspension motor |
| CN113224902A (en) * | 2021-05-10 | 2021-08-06 | 深圳市细猫科技有限公司 | Magnetic suspension power device |
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| CN109026995A (en) * | 2018-07-20 | 2018-12-18 | 南京航空航天大学 | A kind of diamagnetic suspension Minisize axial bearing rotor system |
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