A high efficiency magnetic levitation flywheel system
By combining magnetic levitation technology with a brushless, coreless rare-earth permanent magnet DC motor, the problems of high wear and poor stability of traditional mechanical bearings have been solved, achieving efficient attitude control and improved stability, and extending the service life of spacecraft.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING YAXIN HUACHUANG TECH CO LTD
- Filing Date
- 2024-05-20
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional mechanical bearings suffer from high wear and poor stability. The viscous torque, torque disturbance, and static friction caused by mechanical contact affect the attitude stability and accuracy of spacecraft.
By employing magnetic levitation technology, utilizing radial and axial magnetic bearings, Hall position sensors, and eddy current displacement sensors, combined with a brushless, coreless rare-earth permanent magnet DC motor, rotor levitation and stable control are achieved, reducing mechanical contact.
It improves the stability and attitude control precision of the flywheel, reduces wear and disturbance torque, and extends the life of the spacecraft.
Smart Images
Figure CN224583003U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to flywheel systems, and more particularly to a high-efficiency magnetic levitation flywheel system. Background Technology
[0002] With the increasing demands on the performance of satellites and other spacecraft, the development of magnetically levitated high-speed spacecraft flywheels has become a research hotspot. As one of the key components that determine the performance of spacecraft in satellite and other spacecraft systems, it can not only serve as the actuator of the attitude control system—the momentum wheel, but also utilize its ability to store energy during high-speed rotation to provide the energy required by the spacecraft when it enters the shadow region.
[0003] However, current traditional spacecraft flywheels use mechanical bearings for support, operating at relatively low speeds. Mechanical contact leads to significant bearing wear, which in turn affects satellite lifespan. Furthermore, bearing lubrication introduces adverse factors such as viscous torque, torque disturbances, and static friction. In addition, there is a lack of effective means to control vibrations such as imbalance disturbances. These additional disturbance forces and torques are directly transmitted to the spacecraft's structural integrity, inevitably reducing its attitude stability and accuracy. Utility Model Content
[0004] The purpose of this invention is to solve the problems of high wear and poor stability of traditional mechanical bearings in the prior art. Due to their mechanical structure, mechanical bearings will experience significant wear due to mechanical contact during use. Furthermore, mechanical bearings require lubrication during use, which inevitably leads to adverse factors such as viscous torque, torque disturbance, and static friction.
[0005] To achieve the above objectives, this application proposes a high-efficiency magnetic levitation flywheel system, which will be described below in conjunction with the attached diagram. Figure 1 , Figure 2 The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0006] This application discloses a high-efficiency magnetic levitation flywheel system, which includes: a rotor section 1, a magnetic bearing section 2, a motor section 3, a housing section 4, and a spindle 5.
[0007] Furthermore, the rotor section 1 includes an inner section 11, a middle section 12, and an outer section 13.
[0008] Furthermore, the magnetic bearing section 2 includes: a radial magnetic bearing 21, an axial magnetic bearing 22, a protective bearing 23, and a Hall position sensor 24.
[0009] Furthermore, eight radial magnetic bearings 21 are installed in the middle section 12 of the rotor section 1, and two axial magnetic bearings 22 are installed in the inner section 11 of the rotor. The protective bearing 23 is a deep groove ball bearing, which is installed between the two axial magnetic bearings 22 and the housing section 4. The compact structure formed by this can improve the flatness of the flywheel body, obtain a higher moment-to-mass ratio, and the flywheel rotor can achieve five degrees of freedom by controlling the four pairs of radial magnets and one pair of axial magnets.
[0010] The motor part 3, installed below the rotor part 1, drives the rotor part 1 to rotate around the axis. The housing part 4 is installed on the outermost side of the entire device, and the spindle 5 is installed at the center of the magnetic levitation flywheel system.
[0011] Furthermore, to improve measurement accuracy and stability, the eddy current displacement sensor 2 is installed between the axial magnetic bearing 22 and the protective bearing 23, and is kept parallel to the axial magnetic bearing 22.
[0012] Furthermore, the Hall position sensor 24 is connected to an external monitoring system. The Hall position sensor 24 detects the output voltage signal of the radial axial displacement of the rotor 1. This signal is the input signal of the controller. The controller calculates the displacement signals in the five degrees of freedom according to a certain control algorithm to generate a control signal, and then outputs the control signal to the power amplifier. The power amplifier completes the conversion of control voltage to control current. The control current flows into the electromagnet coil, drives the electromagnet to generate electromagnetic force, and suspends the rotor. The coil current is detected by the Hall current sensor 32 and fed back to the control circuit of the power amplifier. The flywheel drive motor 31 control circuit controls the flywheel drive motor 31 drive circuit to drive the rotor 1 through the phase signal output by the Hall position sensor 24.
[0013] Furthermore, the motor unit 3 includes a flywheel drive motor 31 and a Hall current sensor 32. The motor unit 3 uses the Hall current sensor 32 to measure the phase and speed of the flywheel drive motor 31. The three Hall current sensors 32 are spaced 60 electrical degrees apart and are embedded inside the motor stator.
[0014] The housing part 4 includes a sealing cover 41 and a base 42. The sealing cover 41 is mounted on the base 42 to provide a sealed environment for the entire flywheel system.
[0015] The flywheel drive motor 31 is a six-pole, three-phase brushless, coreless rare-earth permanent magnet DC motor, which is installed between the rotor section 1 and the base 42.
[0016] The beneficial effects of this application are as follows: 1. The magnetic levitation high-speed flywheel of this application has a hollow flywheel body design. This hollow design helps to reduce the overall weight of the flywheel while maintaining its structural strength.
[0017] 2. The radial magnetic bearing of this application adopts a differential mounting structure and is installed on the outside of the flywheel rotor to improve the flatness of the flywheel body and obtain a higher moment-to-mass ratio.
[0018] 3. The eddy current displacement sensor of this application can adjust the magnitude and direction of the electromagnetic force according to the real-time monitoring data to ensure that the flywheel remains stable when rotating at high speed.
[0019] 4. The flywheel drive motor of this application has an external rotor structure and is equipped with a Hall current sensor to monitor the motor's phase and speed. The coil current is detected by the Hall current sensor and fed back to the power amplifier's control circuit. The motor control circuit controls the motor drive circuit to drive the rotor using the phase signal output by the sensor. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of a high-efficiency magnetic levitation flywheel system in an embodiment of this application; Figure 2 The system structure of the magnetically levitated high-speed aerospace flywheel in the embodiments of this application is shown. Figure 3 This is a schematic diagram of the rotor section in an embodiment of this application.
[0022] Explanation of reference numerals in the attached figures: 1. Rotor section; 11. Inner section; 12. Middle section; 13. Outer section; 2. Magnetic bearing section; 21. Radial magnetic bearing; 22. Axial magnetic bearing; 23. Protective bearing; 24. Hall position sensor; 3. Motor section; 31. Flywheel drive motor; 32. Hall effect current sensor; 4. Housing section; 41. Sealing cover; 42. Base; 5. Mandrel. Detailed Implementation
[0023] The following will be combined with the appendix Figure 1 , Figure 2The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0024] like Figures 1-3 This illustration shows a high-efficiency magnetic levitation flywheel system, which includes: a rotor section 1, a magnetic bearing section 2, a motor section 3, a housing section 4, and a spindle 5.
[0025] Furthermore, the rotor section 1 includes an inner section 11, a middle section 12, and an outer section 13.
[0026] Furthermore, the magnetic bearing section 2 includes: a radial magnetic bearing 21, an axial magnetic bearing 22, a protective bearing 23, and a Hall position sensor 24.
[0027] Furthermore, eight radial magnetic bearings 21 are installed in the middle section 12 of the rotor section 1, and two axial magnetic bearings 22 are installed in the inner section 11 of the rotor. The protective bearing 23 is a deep groove ball bearing, which is installed between the two axial magnetic bearings 22 and the housing section 4. The compact structure formed by this can improve the flatness of the flywheel body, obtain a higher moment-to-mass ratio, and the flywheel rotor can achieve five degrees of freedom by controlling the four pairs of radial magnets and one pair of axial magnets.
[0028] The motor part 3, installed below the rotor part 1, drives the rotor part 1 to rotate around the axis. The housing part 4 is installed on the outermost side of the entire device, and the spindle 5 is installed at the center of the magnetic levitation flywheel system.
[0029] In this embodiment, to improve measurement accuracy and stability, the eddy current displacement sensor 2 is installed between the axial magnetic bearing 22 and the protective bearing 23, and is kept parallel to the axial magnetic bearing 22.
[0030] Furthermore, continue to refer to Figure 2The Hall position sensor 24 is connected to an external monitoring system. The Hall position sensor 24 detects the output voltage signal of the radial axial displacement of the rotor 1. This signal is the input signal of the controller. The controller calculates the displacement signals in the five degrees of freedom according to a certain control algorithm to generate a control signal. Then, the control signal is output to the power amplifier. The power amplifier completes the conversion of control voltage to control current. The control current flows into the electromagnet coil, drives the electromagnet to generate electromagnetic force, and suspends the rotor. The coil current is detected by the Hall current sensor 32 and fed back to the control circuit of the power amplifier. The flywheel drive motor 31 control circuit controls the flywheel drive motor 31 drive circuit to drive the rotor 1 through the phase signal output by the Hall position sensor 24.
[0031] Continue to refer to Figure 1 As an improvement to the motor section 3 described above in this application, the motor section 3 includes a flywheel drive motor 31 and a Hall current sensor 32. The motor section 3 uses the Hall current sensor 32 to measure the phase and speed of the flywheel drive motor 31. The three Hall current sensors 32 are spaced 60 electrical degrees apart and are embedded inside the motor stator.
[0032] The housing part 4 includes a sealing cover 41 and a base 42. The sealing cover 41 is mounted on the base 42 to provide a sealed environment for the entire flywheel system.
[0033] The flywheel drive motor 31 is a six-pole, three-phase brushless, coreless rare-earth permanent magnet DC motor, which is installed between the rotor section 1 and the base 42.
[0034] This flywheel employs a relatively compact internal structure. The rotor section 1 is hollow and mounted on the outside of the rotor via two radial magnetic bearings 21, which increases the flatness of the flywheel body and achieves a higher moment-to-mass ratio. The displacement sensor is a Hall position sensor 24, which uses a differential mounting structure to improve measurement accuracy and stability, and is parallel to the bearings on the inside of the rotor. The flywheel drive motor 31 is a six-pole, three-phase brushless, coreless rare-earth permanent magnet DC motor, with the rotor yoke located outside the motor stator, forming an external rotor structure. A Hall current sensor 32 is used to measure the phase and speed of the motor, and this sensor is installed inside the motor stator. The protective bearing 23 is a deep groove ball bearing, which supports the rotor when it is not in a levitated state and acts as a protective device when the rotor experiences severe vibration or system instability. When in operation, the magnetic levitation flywheel system is sealed externally by a sealing cover 41.
[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A high-efficiency magnetic levitation flywheel system, characterized in that, include: The rotor (1), magnetic bearing (2), motor (3), housing (4) and spindle (5) are provided. The rotor (1) includes an inner section (11), a middle section (12) and an outer section (13). The magnetic bearing (2) includes a radial magnetic bearing (21), an axial magnetic bearing (22), a protective bearing (23) and a Hall position sensor (24). Eight radial magnetic bearings (21) are installed in the middle section (12) of the rotor (1), and two axial magnetic bearings (22) are installed in the inner section (11) of the rotor. The protective bearing (23) is a deep groove ball bearing and is installed between the two axial magnetic bearings (22) and the housing (4).
2. The high-efficiency magnetic levitation flywheel system according to claim 1, characterized in that, The motor part (3) installed below the rotor part (1) drives the rotor part (1) to rotate around the axis. The housing part (4) is installed on the outermost side of the entire device, and the spindle (5) is installed at the center of the magnetic levitation flywheel system.
3. The high-efficiency magnetic levitation flywheel system according to claim 1, characterized in that, The Hall position sensor (24) is installed between the axial magnetic bearing (22) and the protective bearing (23) and is parallel to the axial magnetic bearing (22).
4. A high-efficiency magnetic levitation flywheel system according to claim 1 or 2, characterized in that, The motor unit (3) includes a flywheel drive motor (31) and a Hall current sensor (32).
5. A high-efficiency magnetic levitation flywheel system according to claim 4, characterized in that, The housing part (4) includes a sealing cover (41) and a base (42), the sealing cover (41) being mounted on the base (42).
6. A high-efficiency magnetic levitation flywheel system according to claim 5, characterized in that, The flywheel drive motor (31) is a six-pole, three-phase brushless, coreless rare-earth permanent magnet DC motor, which is installed between the outer section (13) and the base (42).
7. A high-efficiency magnetic levitation flywheel system according to claim 6, characterized in that, The three Hall current sensors (32) are spaced 60 electrical degrees apart and are installed inside the stator of the flywheel drive motor (31).