Rotor position control system of magnetic suspension motor and magnetic suspension motor

Abstract

The invention provides a rotor position control system of a magnetic suspension motor and the magnetic suspension motor, the rotor position control system comprises a first electromagnetic bearing module and a second electromagnetic bearing module, the first electromagnetic bearing module and the second electromagnetic bearing module each comprise a position sensor, an electromagnetic bearing, a signal processor and a power driver, the first electromagnetic bearing module further comprises a rotor position controller electrically connected with the signal processor and the power driver of the first electromagnetic bearing module, and sensor signals and power driving instructions are transmitted between the rotor position controller and the second electromagnetic bearing module through optical fibers. According to the rotor position control system, the distributed modular architecture design is adopted, all the modules communicate with one another through optical fibers, and each module only needs a pair of power lines externally connected with a power supply and one optical fiber, so that the cable consumption is greatly reduced, the system complexity and the manufacturing and maintenance cost are reduced, and the quality consistency of the control system is guaranteed. And moreover, electromagnetic interference can be effectively suppressed and isolated, and the device is particularly suitable for megawatt-level high-power application.

Description

Technical Field

[0001] This invention belongs to the field of magnetic levitation motor technology, specifically relating to a rotor position control system for a magnetic levitation motor. Background Technology

[0002] Traditional magnetic levitation motors typically employ a centralized layout architecture, mainly consisting of the motor body, position sensors, electromagnetic bearings, signal processors, power drivers, rotor position controllers, and numerous power and signal cables. The position sensors and electromagnetic bearings are mounted on the motor body, while the signal processor, power driver, and rotor position controller are housed within the motor control box or a separate control cabinet.

[0003] This architecture requires connecting the motor body and the control box through a large number of power cables and signal cables, which presents many technical challenges.

[0004] Firstly, the sheer number and complex layout of the cables are a major factor. For example, a typical five-degree-of-freedom rotor control system requires at least 20 power cables to drive the electromagnetic coils of the electromagnetic bearings and 20 signal cables to transmit sensor signals. In addition, auxiliary cables for temperature and vibration monitoring further increase the system's cost and create numerous potential points of failure, making installation more difficult.

[0005] Secondly, the signal transmission quality is poor. The weak analog signal output by the position sensor is easily affected by electromagnetic interference when transmitted over long distances. The electromagnetic noise generated by frequency converters and high-power motors in the industrial environment will significantly reduce the signal quality. Even with shielded cables and differential transmission technology, it is difficult to completely eliminate the interference, resulting in a decrease in control accuracy.

[0006] Third, the system's dynamic performance is limited. The parasitic inductance and capacitance effects of long signal cables restrict the excitation frequency of the position sensor, reduce the bandwidth of the sensor and control system, and cannot effectively suppress high-frequency vibrations for high-speed rotating rotors, affecting system stability and control accuracy.

[0007] Fourth, high-power applications present significant challenges. The cross-sectional area, length, and weight of power cables in megawatt-level systems increase significantly, resulting in high costs and great difficulties in installation and maintenance. Cable bending radius limitations and mechanical stress issues have become major bottlenecks in project implementation. Moreover, signal cables are longer, making electromagnetic interference issues more severe.

[0008] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide a rotor position control system for a magnetic levitation motor and a magnetic levitation motor, so as to solve the problems of complex layout of existing rotor position control systems.

[0010] To achieve the above objectives, a specific embodiment of the present invention provides a rotor position control system for a magnetic levitation motor. The rotor position control system includes a first electromagnetic bearing module and a second electromagnetic bearing module. Both the first and second electromagnetic bearing modules include a position sensor for detecting the rotor position, an electromagnetic bearing mounted on the rotor, a signal processor electrically connected to the position sensor, and a power driver electrically connected to the electromagnetic bearing. The first electromagnetic bearing module also includes a rotor position controller electrically connected to its signal processor and power driver. The rotor position controller and the second electromagnetic bearing module transmit sensor signals and power drive commands via optical fiber.

[0011] In one or more embodiments of the present invention, both the first electromagnetic bearing module and the second electromagnetic bearing module include an optical fiber transceiver. The optical fiber transceiver of the first electromagnetic bearing module is electrically connected to the rotor position controller, and the optical fiber transceiver of the second electromagnetic bearing module is electrically connected to its signal processor and power driver, and transmits sensor signals and power drive commands to the optical fiber transceiver of the first electromagnetic bearing module via optical fiber.

[0012] In one or more embodiments of the present invention, the position sensor includes a radial position sensor.

[0013] In one or more embodiments of the present invention, the position sensor includes an axial position sensor.

[0014] In one or more embodiments of the present invention, the electromagnetic bearing includes a radial electromagnetic bearing.

[0015] In one or more embodiments of the present invention, the electromagnetic bearing includes an axial electromagnetic bearing.

[0016] In one or more embodiments of the present invention, the first electromagnetic bearing module further includes a host computer communication module for data interaction with a host computer.

[0017] In one or more embodiments of the present invention, at least two second electromagnetic bearing modules are provided, and the rotor position controller transmits sensor signals and power drive commands to each second electromagnetic bearing module via optical fiber.

[0018] In one or more embodiments of the present invention, both the first electromagnetic bearing module and the second electromagnetic bearing module include a housing for mounting on the rotor.

[0019] On the other hand, a specific embodiment of the present invention provides a magnetic levitation motor, the magnetic levitation motor including a rotor, a stator mounted on the rotor, and the aforementioned rotor position control system, wherein the first electromagnetic bearing module and the second electromagnetic bearing module are mounted on the rotor.

[0020] In another aspect, a specific embodiment of the present invention provides a rotor position control system for a magnetic levitation motor. The magnetic levitation motor includes two sets of position sensors and electromagnetic bearings arranged in cooperation. The rotor position control system includes a first electromagnetic bearing control module and a second electromagnetic bearing control module arranged in a one-to-one correspondence with the two sets of position sensors and electromagnetic bearings. Both the first and second electromagnetic bearing control modules include a signal processor for electrical connection with the position sensors and a power driver for electrical connection with the electromagnetic bearings. The first electromagnetic bearing control module also includes a rotor position controller electrically connected to its signal processor and power driver. The rotor position controller and the second electromagnetic bearing control module transmit sensor signals and power drive commands through optical fiber.

[0021] In another aspect, a specific embodiment of the present invention provides a magnetic levitation motor, the magnetic levitation motor including a rotor, a stator mounted on the rotor, at least two sets of radial position sensors configured in cooperation with the rotor, at least one axial position sensor configured in cooperation with the rotor, at least two radial electromagnetic bearings configured in cooperation with the rotor, at least one axial electromagnetic bearing configured in cooperation with the rotor, and the aforementioned rotor position control system.

[0022] Compared with existing technologies, the rotor position control system of this invention adopts a distributed modular architecture design. Different modules communicate with each other via optical fiber. Each module only requires one external power supply line and one optical fiber, significantly reducing the amount of cable used and greatly reducing the complexity of the control system, wiring costs, and installation and maintenance difficulties. The distributed modular architecture design also facilitates mass production and testing, reduces the manufacturing cost of the control system, and ensures the consistency of the control system's quality.

[0023] Furthermore, the compact electromagnetic structure within each module, combined with the inherent electromagnetic immunity of fiber optic communication, effectively suppresses and isolates electromagnetic interference, significantly improves control accuracy and system stability, greatly increases the bandwidth of the control system, and enhances the dynamic performance of the control system in suppressing high-frequency vibrations.

[0024] In addition, the distributed modular architecture design is particularly suitable for megawatt-level high-power applications, which can avoid problems such as prominent parasitic parameters, severe electromagnetic interference and high costs caused by long signal cables and power cables, making the engineering layout, expansion and implementation of high-power magnetic levitation systems more practical and feasible. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the magnetic levitation motor in Embodiment 4 of the present invention;

[0027] Figure 2 This is a schematic diagram of the rotor position control system in Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the magnetic levitation motor in Embodiment 5 of the present invention;

[0029] Figure 4 This is a schematic diagram of the magnetic levitation motor in Embodiment 6 of the present invention.

[0030] Key reference numerals: 100, First electromagnetic bearing module; 200, Second electromagnetic bearing module; 300, First electromagnetic bearing control module; 400, Second electromagnetic bearing control module; 1, Radial position sensor; 2, Axial position sensor; 3, Radial electromagnetic bearing; 4, Axial electromagnetic bearing; 5, Signal processor; 6, Power driver; 7, Rotor position controller; 8, Fiber optic transceiver; 9, Host computer communication module; 10, Rotor; 11, Stator; 12, Magnetic thrust structure; 13, Turbine wheel. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0032] In the description of this invention, it should be understood that the terms "top", "bottom", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example 1

[0035] Reference Figure 1 and Figure 2 As shown, this embodiment provides a rotor position control system for a magnetic levitation motor. This rotor position control system adopts a system architecture design of "distributed intelligent modules, high-speed fiber optic network, and central coordination control." The rotor position control system includes independently configured first electromagnetic bearing module 100 and second electromagnetic bearing module 200. The first electromagnetic bearing module 100 includes a housing (not shown) and integrated within the housing: a position sensor, an electromagnetic bearing, a signal processor 5, a power driver 6, and a rotor position controller 7. The housing of the first electromagnetic bearing module 100 can be fitted onto the rotor 10, with its position sensor positioned around the rotor 10 and its electromagnetic bearing fitted onto the rotor 10. The position sensor of the first electromagnetic bearing module 100 is electrically connected to the signal processor 5, the electromagnetic bearing is electrically connected to the power driver 6, and the rotor position controller 7 is electrically connected to both the signal processor 5 and the power driver 6. The position sensor is mainly used to detect the position of the rotor 10 (e.g., radial position, axial position) and transmits the raw sensor signal (usually an analog signal) containing the rotor position to the signal processor 5. The signal processor 5 amplifies, filters and decomposes the received raw sensor signal to obtain the corresponding digital sensor signal, and transmits the digital sensor signal to the rotor position controller 7. The rotor position controller 7 calculates the required rotor position correction amount based on the rotor position control command sent by the host computer, the built-in control algorithm and the current position of the rotor 10, and transmits the corresponding power drive command to the power driver 6. The power driver 6 amplifies the power drive command using PWM (Pulse Width Modulation) technology based on the received power drive command, and outputs a precise high-frequency switching current to the bearing coil of the electromagnetic bearing to generate the corresponding levitation force to adjust the rotor 10 to the preset position.

[0036] Furthermore, the structure of the second electromagnetic bearing module 200 is similar to the physical structure and working principle of the first electromagnetic bearing module 100. The second electromagnetic bearing module 200 also includes a housing (not shown) and a position sensor, electromagnetic bearing, signal processor 5, and power driver 6 integrated within the housing. However, the second electromagnetic bearing module 200 generally does not include a rotor position controller 7. The housing of the second electromagnetic bearing module 200 can also be fitted onto the rotor 10, with its position sensor positioned around the rotor 10 and its electromagnetic bearing fitted onto the rotor 10. The first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 are generally mounted at different positions on the rotor 10 (e.g., the front and rear ends of the rotor 10). The rotor position controller 7 of the first electromagnetic bearing module 100 establishes a communication transmission relationship with the second electromagnetic bearing module 200 through optical fiber. The signal processor 5 of the second electromagnetic bearing module 200 can transmit the calculated digital sensor signal to the rotor position controller 7 of the first electromagnetic bearing module 100. After obtaining the rotor position correction amount, the rotor position controller 7 can transmit the corresponding power drive commands to the power driver 6 of the first electromagnetic bearing module 100 and the power driver 6 of the second electromagnetic bearing module 200, respectively. This enables the electromagnetic bearings of the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 to work together to perform independent and precise closed-loop control of the rotor 10 with multiple degrees of freedom, thereby achieving stable levitation of the rotor 10 and precise adjustment of the rotor position.

[0037] In the above structural design, both the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 are constructed as integrated physical-mechanical structures. Together, they form a distributed rotor position control system. Different bearing modules communicate with each other via optical fiber. Each bearing module requires only one external power supply line and one optical fiber, significantly reducing the amount of cable used and greatly reducing the complexity of the control system, wiring costs, and installation and maintenance difficulties. The distributed modular architecture design also facilitates mass production and testing, reduces the manufacturing cost of the control system, and ensures the consistency of the control system's quality.

[0038] Furthermore, the compact electromagnetic structure within the bearing module of this embodiment, combined with the inherent electromagnetic immunity of fiber optic communication, effectively suppresses and isolates electromagnetic interference, significantly improving control accuracy and system stability. The power driver 6, integrated within the bearing module, eliminates parasitic parameters introduced by long cables, greatly increasing the bandwidth of the control system and enhancing its dynamic performance in suppressing high-frequency vibrations. Simultaneously, the bearing module of this embodiment can also incorporate a built-in diagnostic unit to provide early warnings of potential faults, making fault location and module replacement simple and quick. This transforms the passive maintenance of the magnetic levitation motor into proactive maintenance, significantly reducing unplanned downtime.

[0039] Furthermore, the distributed modular architecture of the control system in this embodiment is particularly suitable for megawatt-level high-power applications. It fundamentally avoids the problems of prominent parasitic parameters, severe electromagnetic interference, and high costs associated with traditional control systems due to long signal and power cables, making the engineering layout, expansion, and implementation of high-power magnetic levitation systems more practical. Simultaneously, the control system in this embodiment can provide a platform for intelligent upgrades based on an industrial Ethernet communication architecture. It not only supports seamless integration with upper-level systems such as MES (Manufacturing Execution System) and ERP (Enterprise Resource Planning), laying the foundation for upgrading the control system to Industry 4.0 functionality, but also enables continuous learning and optimization of system performance through built-in big data analysis and artificial intelligence algorithms.

[0040] Furthermore, referring to Figure 2 As shown, in this embodiment, the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 both include fiber optic transceivers 8 integrated within their respective housings. The fiber optic transceiver 8 of the first electromagnetic bearing module 100 is electrically connected to the rotor position controller 7 of the first electromagnetic bearing module 100, and the fiber optic transceiver 8 of the second electromagnetic bearing module 200 is electrically connected to the signal processor 5 and the power driver 6 of the second electromagnetic bearing module 200. Furthermore, the fiber optic transceivers 8 of the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 are interconnected through a dedicated fiber optic link to form a core data channel between modules, thereby transmitting sensor signals and power drive commands.

[0041] The fiber optic transceiver 8 is mainly used for electro-optic / photoelectric signal conversion and high-speed signal transmission. Specifically, in the first electromagnetic bearing module 100, after the power drive command generated by its rotor position controller 7 is transmitted to the fiber optic transceiver 8 of this module, the fiber optic transceiver 8 can convert the power drive command into a corresponding optical signal and transmit the optical signal at high speed through optical fiber to the fiber optic transceiver 8 of the second electromagnetic bearing module 200. After receiving the optical signal, the fiber optic transceiver 8 of the second electromagnetic bearing module 200 can accurately restore it to the power drive command and transmit the power drive command to the power driver 6 of this module. At the same time, the sensor signals of the second electromagnetic bearing module 200 can also be transmitted back to the rotor position controller 7 of the first electromagnetic bearing module 100 in real time in the form of optical signals via the opposite path for calculating the rotor position correction amount.

[0042] Furthermore, referring to Figure 2As shown, the first electromagnetic bearing module 100 in this embodiment is generally installed at the front end of the rotor 10, and its position is relatively close to the turbine wheel 13 of the rotor 10. The position sensors of the first electromagnetic bearing module 100 include a radial position sensor 1 and an axial position sensor 2. The radial position sensor 1 is used to detect the radial position of the front end of the rotor 10, and the axial position sensor 2 is used to detect the axial position of the front end of the rotor 10. The radial position sensor 1 and the axial position sensor 2 are generally non-contact sensors, such as eddy current displacement sensors, capacitive displacement sensors, inductive displacement sensors, or photoelectric displacement sensors.

[0043] Furthermore, referring to Figure 2 As shown, the second electromagnetic bearing module 200 in this embodiment is generally installed at the rear end of the rotor 10, and the position of the second electromagnetic bearing module 200 is relatively far away from the turbine wheel 13 of the rotor 10. The position sensor of the second electromagnetic bearing module 200 includes a radial position sensor 1, which is used to detect the radial position of the rear end of the rotor 10. The radial position sensor 1 is generally a non-contact sensor, such as an eddy current displacement sensor, a capacitive displacement sensor, an inductive displacement sensor, or a photoelectric displacement sensor.

[0044] Furthermore, referring to Figure 2 As shown, the electromagnetic bearing of the first electromagnetic bearing module 100 includes a radial electromagnetic bearing 3, which is mounted on the rotor 10. The radial electromagnetic bearing 3 is mainly used to adjust the radial position of the front end of the rotor 10.

[0045] Furthermore, referring to Figure 2 As shown, the electromagnetic bearings of the second electromagnetic bearing module 200 include a radial electromagnetic bearing 3 and an axial electromagnetic bearing 4. Both the radial electromagnetic bearing 3 and the axial electromagnetic bearing 4 of the second electromagnetic bearing module 200 are mounted on the rotor 10 and are used to adjust the radial and axial positions of the rear end of the rotor 10, respectively. The axial electromagnetic bearing 4 needs to cooperate with the magnetic thrust structure 12 on the rotor 10. The axial electromagnetic bearing 4 generally includes two electromagnets arranged along the axial direction of the rotor 10, and the magnetic thrust structure 12 on the rotor 10 is located between the two electromagnets of the axial electromagnetic bearing 4.

[0046] In other embodiments, the installation positions of the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200, as well as the number of position sensors and electromagnetic bearings integrated in each bearing module, can be adjusted according to actual application requirements.

[0047] The installation positions of the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 are not fixed. In actual deployment, the positions of the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 can be interchanged or adjusted according to the requirements of rotor 10 dynamic characteristics, overall mechanical layout, or maintenance convenience. For example, the first electromagnetic bearing module 100 can be installed at the rear end of rotor 10, while the second electromagnetic bearing module 200 can be installed at the front end.

[0048] The type and number of position sensors integrated within each bearing module can be flexibly configured and do not have to be the same. For example, the first electromagnetic bearing module 100 may integrate only radial position sensor 1. For example, the first electromagnetic bearing module 100 may integrate multiple (generally two or more) radial position sensors 1, or multiple axial position sensors 2.

[0049] This diverse design of sensor and bearing configurations enables the control system to accurately match the specific requirements of radial suspension accuracy, axial thrust control, or cost control in different application scenarios. It can effectively improve the adaptability of the control system to different application scenarios (such as five-degree-of-freedom control of rotor 10, three-degree-of-freedom control of rotor 10, etc.) and balance the functionality and manufacturing cost of the control system.

[0050] Furthermore, referring to Figure 2 As shown, the first electromagnetic bearing module 100 in this embodiment also includes a host computer communication module 9. The host computer communication module 9 is interconnected with the fiber optic transceiver 8 of the first electromagnetic bearing module 100 via an optical fiber link, enabling bidirectional data interaction between the host computer and the host computer. Specifically, the host computer communication module 9 is mainly used to receive rotor position control commands, control parameters (such as speed, flow rate, pressure, etc.) and system operation commands issued by the host computer, and transmit them to the rotor position controller 7 of the bearing module. At the same time, the host computer communication module 9 can also continuously collect key operating parameters of the magnetic levitation motor (such as the real-time position of the rotor 10, vibration spectrum, displacement of each degree of freedom, electromagnetic bearing coil current and temperature, module health status and fault warning codes), and upload them to the host computer. This data interaction not only realizes remote monitoring and high-precision debugging of the rotor position control system, but also provides a reliable data channel and interconnection foundation, significantly improving the intelligence level of the control system.

[0051] Example 2

[0052] Reference Figure 3As shown, this embodiment provides a rotor position control system for a magnetic levitation motor. The difference from Embodiment 1 is that the rotor position control system in this embodiment includes at least two second electromagnetic bearing modules 200. The fiber optic transceiver 8 of each second electromagnetic bearing module 200 is interconnected with the fiber optic transceiver 8 of the first electromagnetic bearing module 100 via an optical fiber link. The installation position of each second electromagnetic bearing module 200 can be set according to actual application requirements. For example, one second electromagnetic bearing module 200 can be installed at the rear end of the rotor 10, while the remaining second electromagnetic bearing modules 200 can be installed at the front, middle, or rear end of the rotor 10 as needed.

[0053] Example 3

[0054] Reference Figure 4 As shown, this embodiment provides a rotor position control system for a magnetic levitation motor. The difference from Embodiment 1 is that the rotor position control system in this embodiment does not integrate position sensors and electromagnetic bearings. The position sensors and electromagnetic bearings are still non-contactly mounted on the rotor 10 as independent components. Therefore, the magnetic levitation motor to which the rotor position control system of this embodiment is applicable has at least two sets of position sensors and electromagnetic bearings that are configured in cooperation.

[0055] Specifically, the rotor position control system of this embodiment includes a first electromagnetic bearing control module 300 and a second electromagnetic bearing control module 400. The first electromagnetic bearing control module 300 is configured in conjunction with one set of position sensors and electromagnetic bearings of the magnetic levitation motor, and the second electromagnetic bearing control module 400 is configured in conjunction with another set of position sensors and electromagnetic bearings of the magnetic levitation motor.

[0056] The first electromagnetic bearing control module 300 includes a housing and a signal processor 5, a power driver 6, a rotor position controller 7, and a fiber optic transceiver 8 integrated within the housing. The second electromagnetic bearing control module 400 includes a housing and a signal processor 5, a power driver 6, and a fiber optic transceiver 8 integrated within the housing. The fiber optic transceiver 8 of the first electromagnetic bearing control module 300 and the fiber optic transceiver 8 of the second electromagnetic bearing control module 400 are interconnected via a fiber optic link to transmit sensor signals and power drive commands between the rotor position controller 7 and the second electromagnetic bearing control module 400.

[0057] According to the above structural design, the magnetic levitation motor can still adopt the traditional structural design without changing the structure of the magnetic levitation motor. The first electromagnetic bearing control module 300 and the second electromagnetic bearing control module 400 can be installed nearby around the magnetic levitation motor. This can also reduce the amount of cables used and improve the electromagnetic interference resistance of the control system.

[0058] Example 4

[0059] Reference Figure 1 and Figure 2 As shown, this embodiment provides a magnetic levitation motor, which includes a rotor 10, a stator 11, and the rotor position control system in Embodiment 1. The stator 11 is mounted on the rotor 10, and the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 of the rotor position control system are also mounted on the rotor 10.

[0060] Example 5

[0061] Reference Figure 3 As shown, this embodiment provides a magnetic levitation motor, which includes a rotor 10, a stator 11, and a rotor position control system as described in Embodiment 2. The stator 11 is mounted on the rotor 10, and the first electromagnetic bearing module 100 and the second electromagnetic bearing module 200 of the rotor position control system are also mounted on the rotor 10.

[0062] Example 6

[0063] Reference Figure 4 As shown, this embodiment provides a magnetic levitation motor, which includes a rotor 10, a stator 11, at least two sets of radial position sensors 1, at least one axial position sensor 2, at least two radial electromagnetic bearings 3, at least one axial electromagnetic bearing 4, and the rotor position control system of Embodiment 3. The stator 11 is mounted on the rotor 10. The position sensors are configured to cooperate with corresponding parts of the rotor 10. The electromagnetic bearings are mounted on the rotor 10. The first electromagnetic bearing control module 300 and the second electromagnetic bearing control module 400 are located near the physical positions of the electromagnetic bearings, or are mounted on the housing of the magnetic levitation motor. The first electromagnetic bearing control module 300 is electrically connected to one set of position sensors and electromagnetic bearings, and the second electromagnetic bearing control module 400 is electrically connected to the other set of position sensors and electromagnetic bearings. Both the first electromagnetic bearing control module 300 and the second electromagnetic bearing control module 400 are electrically connected to at least one set of radial position sensors 1, and one of the first electromagnetic bearing control module 300 and the second electromagnetic bearing control module 400 is electrically connected to the axial position sensor 2. The first electromagnetic bearing control module 300 and the second electromagnetic bearing control module 400 are each electrically connected to at least one of the radial electromagnetic bearings 3, and one of the first electromagnetic bearing control module 300 and the second electromagnetic bearing control module 400 is electrically connected to the axial electromagnetic bearing 4.

[0064] It should be noted that in the above and other embodiments of this application, each position sensor may be equipped with a separate signal processor 5, or multiple position sensors in the same module or the same region (e.g., the front end region and the rear end region of the rotor 10) may be equipped with one signal processor 5. Similarly, each electromagnetic bearing may be equipped with a separate power driver 6, or multiple electromagnetic bearings in the same module or the same region may be equipped with one power driver 6.

[0065] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0066] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotor position control system for a magnetic levitation motor, characterized in that, The rotor position control system includes a first electromagnetic bearing module and a second electromagnetic bearing module. Both the first and second electromagnetic bearing modules include a position sensor for detecting the rotor position, an electromagnetic bearing for mounting on the rotor, a signal processor electrically connected to the position sensor, and a power driver electrically connected to the electromagnetic bearing. The first electromagnetic bearing module also includes a rotor position controller electrically connected to its signal processor and power driver. The rotor position controller and the second electromagnetic bearing module transmit sensor signals and power drive commands through optical fiber.

2. The rotor position control system according to claim 1, characterized in that, Both the first electromagnetic bearing module and the second electromagnetic bearing module include fiber optic transceivers. The fiber optic transceiver of the first electromagnetic bearing module is electrically connected to the rotor position controller, and the fiber optic transceiver of the second electromagnetic bearing module is electrically connected to its signal processor and power driver, and transmits sensor signals and power drive commands to the fiber optic transceiver of the first electromagnetic bearing module via fiber optics.

3. The rotor position control system according to claim 1, characterized in that, The position sensor includes a radial position sensor; and / or, The position sensor includes an axial position sensor.

4. The rotor position control system according to claim 1, characterized in that, The electromagnetic bearing includes a radial electromagnetic bearing; and / or, The electromagnetic bearing includes an axial electromagnetic bearing.

5. The rotor position control system according to claim 1, characterized in that, The first electromagnetic bearing module also includes a host computer communication module for data interaction with the host computer.

6. The rotor position control system according to claim 1, characterized in that, At least two second electromagnetic bearing modules are provided, and the rotor position controller transmits sensor signals and power drive commands to each second electromagnetic bearing module via optical fiber.

7. The rotor position control system according to claim 1, characterized in that, Both the first electromagnetic bearing module and the second electromagnetic bearing module include a housing for mounting on the rotor.

8. A magnetic levitation motor, characterized in that, The magnetic levitation motor includes a rotor, a stator mounted on the rotor, and a rotor position control system as described in any one of claims 1 to 7, wherein the first electromagnetic bearing module and the second electromagnetic bearing module are mounted on the rotor.

9. A rotor position control system for a magnetic levitation motor, the magnetic levitation motor comprising two sets of position sensors and electromagnetic bearings arranged in cooperation, characterized in that, The rotor position control system includes a first electromagnetic bearing control module and a second electromagnetic bearing control module, which are configured in a one-to-one correspondence with two sets of position sensors and electromagnetic bearings. Both the first and second electromagnetic bearing control modules include a signal processor for electrical connection with the position sensors and a power driver for electrical connection with the electromagnetic bearings. The first electromagnetic bearing control module also includes a rotor position controller electrically connected to its signal processor and power driver. The rotor position controller and the second electromagnetic bearing control module transmit sensor signals and power drive commands through optical fiber.

10. A magnetic levitation motor, characterized in that, The magnetic levitation motor includes a rotor, a stator mounted on the rotor, at least two sets of radial position sensors that cooperate with the rotor, at least one axial position sensor that cooperates with the rotor, at least two radial electromagnetic bearings that cooperate with the rotor, at least one axial electromagnetic bearing that cooperates with the rotor, and a rotor position control system as described in claim 9.

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