Magnetic suspension bearing, system and control method

Abstract

The invention provides a magnetic suspension bearing, a system and a control method, the magnetic suspension bearing comprises a stator and a rotor arranged in the center of the stator, and at least one electromagnet is formed on the inner side surface, close to the rotor, of the stator; at least one electromagnet is sleeved with a plurality of coils, and the coils are arranged in parallel. According to the two-section type winding magnetic suspension bearing, the control flexibility of the magnetic suspension bearing is improved, and the application field of the magnetic suspension bearing can be expanded.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic bearings, and in particular to a magnetic bearing, system and control method. Background Art

[0002] Magnetic bearings are mainly composed of electromagnets, displacement sensors, controllers, and power amplifiers. Magnetic bearings use electromagnets mounted on the stator to generate electromagnetic force on the rotor, allowing the rotor to stably levitate and rotate without contact with the bearings. Figure 1 As shown, existing magnetic bearings usually adopt one-stage winding, and the operation and control methods are single, which is not conducive to the flexible control of the magnetic bearings. Summary of the Invention

[0003] To address at least one of the above problems, one object of the present application is to provide a magnetic bearing, and to propose a two-stage winding magnetic bearing, which improves the flexibility of magnetic bearing control and facilitates the expansion of the application field of magnetic bearings. Another object of the present application is to provide a magnetic bearing system. Another object of the present application is to provide a control method for a magnetic bearing system. Another object of the present invention is to provide a computer device. Another object of the present invention is to provide a computer-readable medium.

[0004] To achieve the above objectives, the present application discloses, on one hand, a magnetic bearing, comprising a stator and a rotor disposed in the center of the stator, wherein at least one electromagnet is formed on the inner surface of the stator close to the rotor;

[0005] At least one of the electromagnets is provided with a plurality of coils, and the plurality of coils are arranged in parallel.

[0006] Optionally, a magnetic pole is formed on the inner surface of the stator corresponding to two sides of each electromagnet.

[0007] Optionally, gaps are formed between the multiple coils and the corresponding magnetic poles.

[0008] Optionally, a first coil and a second coil are sleeved on at least one of the electromagnets, and the first coil and the second coil are arranged side by side on the electromagnet along a direction from the stator to the rotor.

[0009] Optionally, a first insulating spacer is provided between two adjacent coils among the multiple coils.

[0010] Optionally, the connection terminal of the coil connected to the external control circuit is provided with a waterproof insulation layer.

[0011] Optionally, the coil is fixedly arranged with respect to the inner surface of the electromagnet.

[0012] Optionally, the coil corresponds to an inner surface of the electromagnet and is fixedly bonded to the electromagnet.

[0013] Optionally, a second insulating gasket is arranged between the electromagnet and a stator surface of the magnetic pole.

[0014] The application further discloses a magnetic suspension bearing system, which comprises the magnetic suspension bearing, the driving circuit and the control device.

[0015] The control device is configured to determine a corresponding control signal according to the displacement of the rotor.

[0016] The driving circuit is configured to form a plurality of driving signals of the electromagnet according to the control signal and input the plurality of driving signals into a plurality of coils on the corresponding electromagnet.

[0017] Optionally, when the plurality of coils comprises a first coil and a second coil, and the magnetic suspension bearing is a four-magnet radial magnetic suspension bearing.

[0018] The plurality of driving signals comprises a first driving signal corresponding to an electromagnet bias component and a second driving signal corresponding to an electromagnet differential control component, and the control device is configured to input the first driving signal into the first coil and the second driving signal into the second coil through the driving circuit.

[0019] Optionally, when the plurality of coils comprises a first coil and a second coil.

[0020] When the magnetic suspension bearing is a three-magnet radial magnetic suspension bearing, the plurality of driving signals comprises a third driving signal corresponding to an electromagnet bias component and a fourth driving signal corresponding to a three-phase symmetrical component of the electromagnet, and the control device is configured to input the third driving signal into the first coil and the fourth driving signal into the second coil through the driving circuit.

[0021] Optionally, when the plurality of coils comprises a first coil and a second coil.

[0022] The control device is further configured to input a first working current into the first coil through the driving circuit when the magnetic suspension bearing is normally working, and input the first working current into the first coil and a second working current into the second coil through the driving circuit when the magnetic suspension bearing is subjected to an impact.

[0023] The application further discloses a control method of a magnetic suspension bearing system, which comprises the following steps.

[0024] determining a corresponding control signal according to the displacement of the rotor;

[0025] A plurality of driving signals of the electromagnet are generated according to the control signal, and the plurality of driving signals are respectively input into a plurality of coils on the corresponding electromagnet.

[0026] The present application also discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the control method of the magnetic bearing system as described above is implemented.

[0027] The present application also discloses a computer-readable medium having a computer program stored thereon. When the program is executed by a processor, the control method of the magnetic bearing system described above is implemented.

[0028] The technical solution of this application has the following significant beneficial effects:

[0029] The magnetic bearing of the present application includes a stator and a rotor arranged in the center of the stator, and at least one electromagnet is formed on the inner surface of the stator close to the rotor; at least one of the electromagnets is provided with a plurality of coils, and the plurality of coils are arranged in parallel. The magnetic bearing of the present application is provided with a plurality of coils, and the plurality of coils are independently controlled from each other, so that the magnetic bearing can input different signals to achieve flexible control of the magnetic bearing, so that the magnetic bearing can be applied to a three-magnet radial magnetic bearing, and can cope with scenarios with large impact loads, thereby improving the application scenarios and comprehensive impact resistance of the magnetic bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are merely illustrative and are used to help understand the present disclosure, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present disclosure. Those skilled in the art, under the guidance of the present disclosure, can select various possible shapes and proportional dimensions to implement the present disclosure according to specific circumstances.

[0032] Figure 1 Schematic diagram of a magnetic bearing in the prior art;

[0033] Figure 2 A schematic diagram of a specific embodiment of the magnetic bearing of the present application;

[0034] Figure 3This is a schematic diagram of a stator of a three-phase magnet radial magnetic bearing according to a specific embodiment of the magnetic bearing of the present application;

[0035] Figure 4 A schematic diagram of magnetic flux calculation for a specific embodiment of a magnetic bearing of this application;

[0036] Figure 5 A schematic diagram showing the structure of a computer device suitable for implementing an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0040] Positional relationships such as “parallel” or “perpendicular” include not only completely “parallel” or “perpendicular” positional relationships, but also positional relationships with angular deviations relative to completely “parallel” or “perpendicular” within a preset deviation range.

[0041] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0042] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] Figure 2 This is a schematic diagram of the structure of the magnetic bearing provided by this application. Figure 2 As shown, the magnetic bearing provided by the embodiment of the present application includes a stator and a rotor arranged in the center of the stator, and at least one electromagnet is formed on the inner surface of the stator close to the rotor.

[0045] Wherein, at least one of the electromagnets is provided with a plurality of coils, and the plurality of coils are arranged in parallel.

[0046] The magnetic levitation bearing of the present application is provided with multiple coils, and the multiple coils are independently controlled with each other, so that the magnetic levitation bearing can input different signals to realize flexible control of the magnetic levitation bearing, so that the magnetic levitation bearing can be applied to three-magnet radial magnetic levitation bearings, and can cope with scenarios with large impact loads, thereby improving the application scenarios and comprehensive impact resistance of the magnetic levitation bearing.

[0047] In an optional embodiment, a magnetic pole is formed on the inner surface of the stator corresponding to both sides of each electromagnet to assist the electromagnet in forming a magnetic field, so that the coil can form a magnetic field force under the action of the magnetic field when a current signal passes through it. The resultant force of all magnetic field forces forms a bearing force on the rotor, so as to achieve the purpose of adjusting the position of the rotor through the bearing force.

[0048] In an optional embodiment, gaps are formed between the multiple coils and the corresponding magnetic poles to facilitate heat dissipation of the coils.

[0049] In an optional embodiment, a first coil 1 and a second coil 2 are sleeved on the electromagnet, and the first coil 1 and the second coil 2 are arranged side by side on the electromagnet in the direction of the stator towards the rotor.

[0050] It can be understood that in this optional embodiment, two coils including the first coil 1 and the second coil 2 can be arranged on the electromagnet, and the two coils can be sleeved on the electromagnet in sequence in the direction towards the rotor. Of course, in other embodiments, a person skilled in the art can arrange other numbers of coils on the magnetic bearing according to actual needs, and the present application does not limit this.

[0051] In an optional embodiment, a first insulating pad is arranged between adjacent two coils in the plurality of coils to insulate the plurality of coils, so as to avoid mutual interference when each coil is controlled respectively, and to realize independent control of the plurality of coils.

[0052] In an optional embodiment, a waterproof insulating layer is arranged on the wiring end of the coil connected with the external control circuit, so as to avoid short circuit and other fault conditions caused by the contact of the wiring end with water source.

[0053] In an optional embodiment, the coil is fixed on the inner side surface of the electromagnet. The inner side surface of the coil is fixed on the surface of the electromagnet, so that the coil is relatively fixed on the electromagnet, and the plurality of coils on the electromagnet will not collide and interfere with each other during control.

[0054] In an optional embodiment, the coil is fixed on the inner side surface of the electromagnet. The inner side surface of the coil is fixed on the surface of the electromagnet, so that the coil is relatively fixed on the electromagnet, and the plurality of coils on the electromagnet will not collide and interfere with each other during control.

[0055] In an optional embodiment, a second insulating pad is arranged on the stator surface between the electromagnet and the magnetic pole, so as to protect the coil and the wiring terminal of the coil.

[0056] Based on the same principle, the present embodiment also discloses a magnetic bearing system. The magnetic bearing system comprises the magnetic bearing, a driving circuit and a control device.

[0057] The control device is used to determine a corresponding control signal according to the displacement of the rotor.

[0058] The driving circuit is used to form a plurality of driving signals of the electromagnet according to the control signal, and input the plurality of driving signals into the plurality of coils on the corresponding electromagnet.

[0059] In an optional embodiment, when the multiple coils include a first coil 1 and a second coil 2, and the magnetic levitation bearing is a four-magnet radial magnetic levitation bearing, the multiple drive signals include a first drive signal corresponding to the electromagnet bias component and a second drive signal corresponding to the electromagnet differential control component, and the control device is used to input the first drive signal to the first coil 1 and the second drive signal to the second coil 2 through the drive circuit.

[0060] It should be noted that determining the corresponding control signal based on the rotor displacement can be determined based on existing technologies. By detecting the rotor displacement, it is determined whether the rotor has deviated from its normal position, and then the expected bearing force required to pull the rotor back to its normal position is determined. Based on the expected bearing force, the control signal required to generate the expected bearing force can be determined. In addition, because the electromagnet is provided with a first coil 1 and a second coil 2, those skilled in the art can generate a first drive signal and a second drive signal based on the control signal as required, thereby obtaining a bias component and a differential control component, forming the expected bearing force, and reducing the overall energy consumption and heat generation of the system.

[0061] In an optional embodiment, when the multiple coils include a first coil 1 and a second coil 2, and when the magnetic levitation bearing is a three-magnet radial magnetic levitation bearing, the multiple drive signals include a third drive signal corresponding to the electromagnet bias component and a fourth drive signal corresponding to the electromagnet three-phase symmetrical component, and the control device is used to input the third drive signal to the first coil 1 and the fourth drive signal to the second coil 2 through the drive circuit.

[0062] Similarly, since the electromagnet is provided with a first coil 1 and a second coil 2, technical personnel in this field can generate a third drive signal and a fourth drive signal based on the control signal as required, and then obtain a bias component and a three-phase symmetrical component to form the expected bearing force and reduce the overall energy consumption and heat generation of the system.

[0063] In a specific example, when the magnetic bearing is a three-magnet radial magnetic bearing, the magnetic bearing includes a stator, and the stator includes a three-phase magnet. The control method for the three-magnet radial magnetic bearing includes determining an expected bearing force based on the rotor displacement at the magnetic bearing. Determining an offset component and a three-phase symmetrical component based on the expected bearing force. Obtaining a magnetic flux vector of the three-phase magnet based on the offset component and the three-phase symmetrical component, calculating a drive signal for the three-phase magnet based on the magnetic flux vector and inputting it into a corresponding drive circuit, such that the resultant force of the three-phase magnet on the rotor is the expected bearing force.

[0064] Among them, the three-magnet radial magnetic bearing control method determines the expected bearing force based on the displacement of the rotor corresponding to the magnetic bearing; determines the bias component and the three-phase symmetrical component based on the expected bearing force; obtains the magnetic flux vector of the three-phase magnet based on the bias component and the three-phase symmetrical component, calculates the driving signal of the three-phase magnet based on the magnetic flux vector and inputs it into the corresponding driving circuit, so that the resultant force of the three-phase magnet on the rotor is the expected bearing force. The present application divides the magnetic flux vector of the radial magnetic bearing electromagnet into a bias component and a symmetrical three-phase component, so that the driving signal formed by the magnetic flux vector does not have a mutation point, reduces the oscillation of the driving circuit, and affects the safety of the system. In addition, a three-phase magnet with three weakly coupled electromagnets is used, and a bias component is set to reduce the bearing force error, so that the radial magnetic bearing can obtain good dynamic performance. The present application can simultaneously achieve a small bearing force error and a smooth magnetic flux vector.

[0065] Determining the bias component and the three-phase symmetric component according to the expected bearing force includes determining the three-phase symmetric component according to the expected bearing force and a preset magnetic constant. Determining the bias component according to the three-phase symmetric component and a preset magnetic constant.

[0066] Specifically, Figure 3 The stator structure of a three-phase radial magnetic bearing with different configurations is shown. The electromagnet aligned with the x-axis is defined as electromagnet 1, and the electromagnets at 120° and 240° to the x-axis are defined as electromagnets 2 and 3, respectively. When the rotor deviates from the center of the magnetic bearing, the rotor displacement can be measured, and the expected bearing force u = u can be calculated based on the rotor displacement. x +ju y (The real part represents the component of the expected bearing force in the x direction, and the imaginary part represents the component in the y direction), and then the reference flux signal of each electromagnet is calculated by the flux distribution method. Input it into the driving circuit, and the driving circuit can control the actual magnetic flux φ1, φ2, φ3 in each coil of the three-magnet radial magnetic bearing to track the reference magnetic flux signal Since the drive circuit usually has sufficient bus voltage, the actual flux signal can quickly track the reference flux signal. There is no distinction between the two.

[0067] The expression of the bearing force that the magnetic bearing can generate is:

[0068]

[0069] Among them, f b =f bx +jf by , represents the plane bearing force, the real part f bx represents the bearing force component in the x direction, the imaginary part fby A represents the bearing force component in the y direction; b is the effective magnetic pole area of ​​each electromagnet; μ0 is the vacuum permeability; φ=[φ1φ2 φ3] T is the electromagnet flux vector, where each element is the magnetic flux of each electromagnet in the radial magnetic bearing. Subscript 1 represents the electromagnet coinciding with the x-axis, 2 and 3 represent the electromagnets coinciding with the x-axis at 120° and 240°, respectively. represents the magnetic flux square vector; is the direction vector of the line of action of the force generated by the three electromagnets.

[0070] The flux distribution method is essentially to solve the problem of φ1, φ2, φ3 with respect to u x ,u y (or |u|,θ u ). When designing the flux distribution method, we always hope that there will be a small error between the actual bearing force fb and the expected bearing force u, that is:

[0071] f b →u(2)

[0072] At the same time, the magnetic flux signals φ1, φ2, φ3 are continuous and smooth for the continuous expected bearing force u, so as to facilitate the implementation of the driving circuit.

[0073] Here, the magnetic flux vector φ is decomposed into the bias component φ b and symmetrical three-phase components φ c ,Right now:

[0074] φ=φ b [1 1 1] T +φ c (3)

[0075] Where,

[0076] If we define φ=|v T φ c |,θ φ =∠v T φ,u=4μ0A b |u|,θ u =∠u, then the magnetic flux signal can be expressed as Figure 4 The calculation is shown in the flowchart.

[0077] Preferably, the preset magnetic constant is half of the maximum magnetic flux of the electromagnet.

[0078] In an optional embodiment, determining the amplitude of the three-phase symmetrical component based on the expected bearing force and the preset magnetic constant includes obtaining an expected reference bearing force based on the expected bearing force, vacuum magnetic permeability, and the effective magnetic pole area of ​​the electromagnet. If the expected reference bearing force is less than twice the square of the preset magnetic constant, the amplitude of the three-phase symmetrical component is obtained by dividing the reference bearing force by twice the preset magnetic constant. If the expected reference bearing force is greater than or equal to twice the square of the preset magnetic constant, the amplitude of the three-phase symmetrical component is obtained by calculating the square root of half the expected reference bearing force.

[0079] In an optional embodiment, determining the bias component according to the amplitudes of the three-phase symmetrical components and a preset magnetic constant includes determining a maximum value between the preset magnetic constant and the amplitudes of the three-phase symmetrical components as the bias component.

[0080] In an optional embodiment, obtaining the magnetic flux vector of the three-phase magnet according to the bias component and the amplitude of the three-phase symmetrical component includes obtaining the magnetic flux vector of the three-phase magnet according to the bias component, the amplitude of the three-phase symmetrical component, the expected bearing force and the setting angle of each of the electromagnets.

[0081] In an optional embodiment, obtaining the magnetic flux vector of the three-phase magnet based on the bias component, the three-phase symmetrical component, the expected bearing force, and the setting angle of each electromagnet includes: obtaining an angle difference based on the bearing force angle of the expected bearing force and the setting angle of each electromagnet; obtaining a three-phase symmetrical component based on the angle difference corresponding to each electromagnet in the three-phase magnet and the amplitude of the symmetrical three-phase component; and superimposing the three-phase symmetrical component of each electromagnet with the bias component to obtain the magnetic flux of each electromagnet.

[0082] In an optional embodiment, the electromagnet is a horseshoe-shaped electromagnet, a mountain-shaped electromagnet, or a homopolar electromagnet.

[0083] In an optional embodiment, generating a drive signal for the radial magnetic bearing based on the magnetic flux vector and inputting the drive signal to the corresponding three electromagnets includes: generating a magnetic flux adjustment value based on the magnetic flux vector and an actual magnetic flux signal of each electromagnet; performing PI adjustment on the magnetic flux adjustment value and then pulse width modulation to obtain the drive signal; and inputting the drive signal to the corresponding electromagnet.

[0084] Under the three-phase variable bias flux distribution method, the error between the expected bearing force and the actual bearing force can be defined as the amplitude error and the phase error. Here, the amplitude error is defined as The phase error is θ u -θ f (where θ f =∠fb ). Compared with the three-phase constant bias linearized flux distribution method, the error of this application is significantly reduced. The three electromagnet flux signals are about θ u Continuous and smooth, which greatly reduces the hardware requirements for the bus voltage of the drive circuit. Especially compared with the three-phase zero-bias flux distribution method, due to the application of θ φ =θ u So in θ u When spanning 360°, no sudden change in the magnetic flux signal is introduced, which increases the safety of the drive circuit.

[0085] In an optional embodiment, when the multiple coils include a first coil 1 and a second coil 2, the control device is further used to input a first working current to the first coil 1 through the drive circuit when the magnetic bearing is working normally; when the magnetic bearing is impacted, input a first working current to the first coil 1 through the drive circuit, and input a second working current to the second coil 2.

[0086] Specifically, during normal operation, only the first coil 1 flows with the first operating current, ensuring the rotor is suspended and centered on the bearing. When the rotating machinery is subjected to a significant shock, the second coil 2 is activated, and a separately designed shock-resistant controller controls the current in the second coil 2 to ensure that the magnetically levitated rotating machinery can maintain normal operation under significant shock loads. Optionally, a supercapacitor can be added to the power amplifier in the controller that controls the second coil 2. This allows the second coil 2 to quickly generate a high current when the system experiences a short-term shock load, thereby improving the shock resistance of the magnetic bearing.

[0087] Since the principle of solving the problem of this system is similar to that of the above-mentioned magnetic levitation bearing, the implementation of this system can refer to the implementation of the magnetic levitation bearing, and will not be repeated here.

[0088] Based on the same principle, this embodiment also discloses a control method for a magnetic bearing system. The method includes:

[0089] S100: Determine a corresponding control signal according to the displacement of the rotor.

[0090] S200: generating a plurality of driving signals for the electromagnet according to the control signal, and inputting the plurality of driving signals into a plurality of coils on the corresponding electromagnet respectively.

[0091] Since the principle of solving the problem by this method is similar to that of the above-mentioned magnetic levitation bearing and system, the implementation of this method can refer to the implementation of the magnetic levitation bearing and system, and will not be repeated here.

[0092] The systems, apparatuses, modules or units disclosed in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, and specifically, the computer device can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0093] In a typical example, the computer device specifically includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method performed by the client as described above, or the processor implements the method performed by the server as described above when executing the program.

[0094] Reference is made below to Figure 5 which shows a structural schematic diagram of a computer device 600 suitable for use in implementing embodiments of the present application.

[0095] As shown in Figure 5 , the computer device 600 includes a central processing unit (CPU) 601, which can perform various appropriate operations and processes according to programs stored in a read-only memory (ROM) 602 or loaded from a storage portion 608 to a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the computer device 600 are also stored. The CPU 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0096] The following components are connected to the I / O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output portion 607 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), and the like, and a speaker, and the like; a storage portion 608 including a hard disk, and the like; and a communication portion 609 including a network interface card such as a LAN card, a modem, and the like. The communication portion 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as necessary. A removable recording medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, and the like is attached to the drive 610 as necessary, so that a computer program read therefrom is installed in the storage portion 608 as necessary.

[0097] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program including program code for executing the methods illustrated in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication portion 609 and / or installed from removable media 611.

[0098] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0099] For the convenience of description, the above devices are described as being divided into various units according to their functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0100] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0103] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0104] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0105] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0106] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0107] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A magnetic bearing, characterized in that: The invention comprises a stator and a rotor arranged in the center of the stator, wherein at least one electromagnet is formed on the inner surface of the stator close to the rotor; At least one of the electromagnets is provided with a plurality of coils, and the plurality of coils are arranged in parallel.

2. The magnetic bearing according to claim 1, characterized in that: A magnetic pole is formed on the inner surface of the stator corresponding to two sides of each electromagnet.

3. The magnetic bearing according to claim 2, characterized in that: Gaps are formed between the plurality of coils and the corresponding magnetic poles.

4. The magnetic bearing according to claim 1, characterized in that: A first coil and a second coil are sleeved on at least one of the electromagnets, and the first coil and the second coil are arranged side by side on the electromagnet along a direction from the stator to the rotor.

5. The magnetic bearing according to claim 1, characterized in that: A first insulating spacer is provided between two adjacent coils among the plurality of coils.

6. The magnetic bearing according to claim 1, characterized in that: The connection terminal of the coil connected to the external control circuit is provided with a waterproof insulation layer.

7. The magnetic bearing according to claim 1, characterized in that: The coil is fixedly arranged on the electromagnet corresponding to the inner surface of the electromagnet.

8. The magnetic bearing according to claim 7, characterized in that: The coil is bonded and fixed to the electromagnet corresponding to the inner surface of the electromagnet.

9. The magnetic bearing according to claim 2, characterized in that: A second insulating gasket is provided on the stator surface between the electromagnet and the magnetic pole.

10. A magnetic bearing system, characterized in that: Comprising the magnetic bearing, drive circuit and control device according to any one of claims 1 to 9; The control device is used to determine a corresponding control signal according to the displacement of the rotor; The driving circuit is used to generate a plurality of driving signals for the electromagnet according to the control signal, and input the plurality of driving signals into a plurality of coils on the corresponding electromagnet respectively.

11. The magnetic bearing system according to claim 10, characterized in that: When the plurality of coils include a first coil and a second coil, and the magnetic bearing is a four-magnet radial magnetic bearing; The multiple drive signals include a first drive signal corresponding to the electromagnet bias component and a second drive signal corresponding to the electromagnet differential control component. The control device is used to input the first drive signal to the first coil and the second drive signal to the second coil through the drive circuit.

12. The magnetic bearing system according to claim 10, characterized in that: When the plurality of coils include a first coil and a second coil; When the magnetic levitation bearing is a three-magnet radial magnetic levitation bearing, the multiple drive signals include a third drive signal corresponding to the electromagnet bias component and a fourth drive signal corresponding to the three-phase symmetrical component of the electromagnet. The control device is used to input the third drive signal to the first coil and the fourth drive signal to the second coil through the drive circuit.

13. The magnetic bearing system according to claim 10, characterized in that: When the plurality of coils include a first coil and a second coil; The control device is further configured to input a first working current to the first coil through the drive circuit when the magnetic bearing is operating normally; and to input a first working current to the first coil and a second working current to the second coil through the drive circuit when the magnetic bearing is impacted.

14. A control method for a magnetic bearing system, characterized in that: include: Determine the corresponding control signal according to the displacement of the rotor; A plurality of driving signals of the electromagnet are generated according to the control signal, and the plurality of driving signals are respectively input into a plurality of coils on the corresponding electromagnet.

15. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the control method of the magnetic bearing system according to claim 14 is implemented.

16. A computer-readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the control method of the magnetic bearing system according to claim 14 is implemented.

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