Experimental system and method for simulating flywheel eccentricity fault under high-speed rotation conditions

Abstract

The present invention discloses a flywheel eccentricity fault simulation experimental system and experimental method under high-speed rotation conditions, which belongs to the field of flywheel eccentricity fault experiments, including a platform experimental mechanism and an information collection and processing mechanism, wherein the platform experimental mechanism includes an experimental platform and a permanent magnet synchronous motor and a flywheel axially arranged on the top of the experimental platform in sequence, the permanent magnet synchronous motor and the flywheel are connected via a coupling, and both ends of the flywheel shaft of the flywheel are vertically connected to the experimental platform via eccentric bearings; the permanent magnet synchronous motor is electrically connected to a vector frequency converter; the information collection and processing mechanism is used to monitor the vibration and temperature of the platform experimental mechanism, and analyze the charge and discharge efficiency of the energy storage system under eccentricity faults. The present invention adopts the above-mentioned flywheel eccentricity fault simulation experimental system and experimental method under high-speed rotation conditions, which can simulate the eccentricity fault of the flywheel energy storage system under high-speed rotation conditions, and the obtained results are more in line with reality, providing a scientific basis for the subsequent intelligent operation and maintenance of the flywheel energy storage system.

Description

Technical Field

[0001] The invention relates to the technical field of flywheel eccentricity fault experiments, and in particular to a flywheel eccentricity fault simulation experiment system and an experiment method under high-speed rotation conditions. Background Art

[0002] Flywheel energy storage refers to a storage method that uses an electric motor to drive a flywheel to rotate at high speed, and then uses the flywheel to drive a generator to generate electricity when needed. The technical characteristics are high power density and long life. As an emerging energy storage method, it has broad application prospects in the fields of power quality control, uninterruptible transition power supply, and grid frequency regulation.

[0003] During the operation of the flywheel energy storage system, eccentricity failure often occurs. Once an eccentricity failure occurs, the high-speed operation of the flywheel will produce obvious vibration and noise, increase mechanical internal stress, intensify wear and fatigue of parts, and reduce the service life of the energy storage system. Even in extreme cases, eccentricity may cause serious accidents such as flywheel rupture, posing a potential safety threat to the surrounding environment and personnel. Therefore, in-depth research on flywheel eccentricity failure is crucial to improving the reliability and stability of flywheel energy storage systems.

[0004] Existing flywheel eccentricity faults are mostly solved by adding a mass block to the outer circumference of the rotor to achieve eccentricity. This method is very likely to cause the mass block to derail when running at high speed, posing a great threat to the safety of the experimenters. Therefore, it can only operate at low speed and is not suitable for the actual working conditions of the flywheel energy storage system (i.e., high-speed rotation conditions). Summary of the invention

[0005] To solve the above problems, the present invention provides a flywheel eccentricity fault simulation experimental system and experimental method under high-speed rotation conditions, which can simulate the eccentricity fault of the flywheel energy storage system under high-speed rotation conditions. The obtained results are more in line with reality, providing a scientific basis for the subsequent intelligent operation and maintenance of the flywheel energy storage system.

[0006] To achieve the above-mentioned purpose, the present invention provides a flywheel eccentricity fault simulation experiment system under high-speed rotation conditions, including a platform experiment mechanism and an information collection and processing mechanism, the platform experiment mechanism includes an experiment platform and a permanent magnet synchronous motor and a flywheel axially arranged on the top of the experiment platform in sequence, the permanent magnet synchronous motor and the flywheel are connected via a coupling, and both ends of the flywheel shaft of the flywheel are vertically rotatably connected to the experiment platform via eccentric bearings;

[0007] The permanent magnet synchronous motor is electrically connected to the vector inverter;

[0008] The information collection and processing mechanism is used to monitor the vibration and temperature of the platform experimental mechanism, and analyze the charging and discharging efficiency of the energy storage system under eccentric fault based on the vibration and temperature.

[0009] Preferably, both ends of the rotor shaft of the permanent magnet synchronous motor are rotatably arranged on the top of the experimental platform via concentric bearings, and the rotor shaft close to one end of the flywheel passes through the concentric bearing and is connected to the flywheel shaft passing through the eccentric bearing via a coupling;

[0010] The concentric bearing comprises a first outer ring, a first inner ring concentrically arranged inside the first outer ring, and a first ball disposed between the first outer ring and the first inner ring;

[0011] The eccentric bearing comprises a second outer ring, a second inner ring eccentrically arranged inside the second outer ring, and second balls rollingly arranged between the second outer ring and the second inner ring.

[0012] Preferably, the eccentricity between the second outer ring and the second inner ring is 0.1 mm-0.3 mm.

[0013] Preferably, the eccentric bearing and the concentric bearing are both linearly arranged on the experimental platform via a split bearing seat, the split bearing seat comprises a bearing base fixed to the top of the experimental platform and a bearing upper end cover detachably arranged on the top of the bearing base via bolts, and an eccentric bearing or a concentric bearing is arranged between the bearing base and the bearing upper end cover;

[0014] Multiple split bearing seats are coaxially arranged.

[0015] Preferably, the coupling is an Oldham coupling, which includes a left mounting disk, a middle flexible disk and a right mounting disk, one side of the left mounting disk has an interference fit with the rotor shaft of the permanent magnet synchronous motor, and the other side is connected to one side of the middle flexible disk via a slot, the other side of the middle flexible disk is connected to one side of the right mounting disk via a slot, and the other side of the right mounting disk has an interference fit with the flywheel shaft.

[0016] Preferably, the information acquisition and processing mechanism includes a host computer, a vibration sensor group for collecting vibration information of the flywheel and the permanent magnet synchronous motor, a temperature sensor group for collecting temperature information of the permanent magnet synchronous motor, a torque speed sensor for collecting the output torque of the permanent magnet synchronous motor, and a voltage and current sensor for collecting voltage and current information of the permanent magnet synchronous motor. The vibration sensor group, the temperature sensor group, the torque speed sensor, and the voltage and current sensor are all in communication with the host computer, and are used to analyze the fault information of the eccentric energy storage system according to the collected vibration information and temperature, and analyze the charge and discharge efficiency of the energy storage system according to the data of the voltage and current sensors;

[0017] The vibration sensor group includes a first vibration sensor arranged on a split bearing seat of a flywheel shaft, a second vibration sensor arranged on a split bearing seat of a rotor shaft of a permanent magnet synchronous motor, a third vibration sensor arranged on a stator of the permanent magnet synchronous motor, and a fourth vibration sensor arranged on an extended end of a stator winding of the permanent magnet synchronous motor;

[0018] The temperature sensor group includes a plurality of temperature sensors uniformly distributed on the stator end surface of the permanent magnet synchronous motor in a circumferential array;

[0019] The torque and speed sensor is connected between the rotor shaft and the flywheel shaft of the permanent magnet synchronous motor via an elastic coupling.

[0020] The experimental method of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions includes the following steps:

[0021] S1. Manufacturing a plurality of eccentric bearings with different eccentricity values;

[0022] S2. Assembly:

[0023] The permanent magnet synchronous motor is fixed on the experimental platform with bolts, and the two ends of the rotor shaft are connected to concentric bearings respectively, and then connected to the flywheel through a coupling and an eccentric bearing, and another eccentric bearing is connected to the side of the flywheel away from the permanent magnet synchronous motor;

[0024] S3, turning on the permanent magnet synchronous motor, and using the vector inverter to control the speed of the permanent magnet synchronous motor to increase evenly until the set speed is reached;

[0025] S4, using a vibration sensor group, a temperature sensor group, a torque sensor and a voltage and current sensor to respectively collect flywheel vibration information, permanent magnet synchronous motor vibration information, permanent magnet synchronous motor temperature information, output torque and voltage and current information of the permanent magnet synchronous motor, and transmit the collected data to a host computer;

[0026] S5. The host computer analyzes the vibration response and charging and discharging efficiency of the energy storage system under the eccentricity fault according to the received vibration information, temperature information, output torque, and voltage and current information;

[0027] S6. Replace the eccentric bearing and repeat steps S2-S3 to detect the vibration response and charging and discharging efficiency of the energy storage system under this eccentric bearing until all eccentric bearings are tested and the influence of the flywheel eccentricity fault on the permanent magnet synchronous motor is determined.

[0028] Preferably, in step S1, three eccentric bearings are manufactured, and the eccentricity values ​​of the three eccentric bearings are 0.1 mm, 0.2 mm, and 0.3 mm, respectively.

[0029] Preferably, in step S3, the set rotation speed is 18000 r / min.

[0030] Preferably, the charging and discharging efficiency of the energy storage system in step S5 is calculated as follows:

[0031]

[0032] In the formula, the released energy represents the energy transmitted back to the grid by the flywheel during the discharge process; the stored energy represents the electrical energy consumed by the grid side during the charging process.

[0033] The present invention has the following beneficial effects:

[0034] 1. It can simulate the eccentricity fault of the flywheel energy storage system under high-speed rotation conditions, and the results obtained are more realistic, providing a scientific basis for the subsequent intelligent operation and maintenance of the flywheel energy storage system;

[0035] 2. Simple structure and easy testing.

[0036] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A three-dimensional diagram of a flywheel eccentricity fault simulation experimental system under high-speed rotation conditions of the present invention;

[0038] Figure 2 A schematic diagram of the structure of a permanent magnet synchronous motor of a flywheel eccentricity fault simulation experimental system under high-speed rotation conditions of the present invention;

[0039] Figure 3 It is a schematic diagram of the arrangement of eccentric bearings of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions of the present invention;

[0040] Figure 4 It is a schematic diagram of the concentric bearing structure of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions of the present invention;

[0041] Figure 5 The figure is a schematic diagram of the structure of the Oldham coupling of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions of the present invention.

[0042] Among them, 1. experimental platform; 2. permanent magnet synchronous motor; 21. stator; 22. rotor shaft; 3. split bearing seat; 4. torque and speed sensor; 5. Oldham coupling; 51. left mounting disk; 52. middle flexible disk; 53. right mounting disk; 6. flywheel; 61. flywheel shaft; 7. vibration sensor group; 71. first vibration sensor; 72. second vibration sensor; 73. third vibration sensor; 8. eccentric bearing; 81. second inner ring; 82. second ball; 83. second outer ring; 9. concentric bearing; 91. first inner ring; 92. first ball; 93. first outer ring; 10. elastic coupling. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0044] It should be noted that the terms "include", "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or devices.

[0045] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] like Figure 1-Figure 5The figure shows a flywheel eccentricity fault simulation experimental system under high-speed rotation conditions, including a platform experimental mechanism and an information acquisition and processing mechanism. The platform experimental mechanism includes an experimental platform 1 and a permanent magnet synchronous motor 2 and a flywheel 6 axially arranged on the top of the experimental platform 1 in sequence. The permanent magnet synchronous motor 2 and the flywheel 6 are connected via a coupling, and both ends of the flywheel shaft 61 of the flywheel 6 are vertically rotatably connected to the experimental platform 1 via an eccentric bearing 8; the permanent magnet synchronous motor 2 is electrically connected to the vector inverter to control the speed of the permanent magnet synchronous motor 2; the information acquisition and processing mechanism is used to monitor the vibration and temperature of the platform experimental mechanism, and analyze the charging and discharging efficiency of the energy storage system under the eccentricity fault based on the vibration and temperature.

[0049] Both ends of the rotor shaft 22 of the permanent magnet synchronous motor 2 are rotatably arranged at the top of the experimental platform 1 through the concentric bearing 9, and the rotor shaft 22 near one end of the flywheel 6 passes through the concentric bearing 9 and is connected to the flywheel shaft 61 passing through the eccentric bearing 8 through the coupling; the concentric bearing 9 includes a first outer ring 93, a first inner ring 91 concentrically arranged inside the first outer ring 93, and a first ball 92 arranged between the first outer ring 93 and the first inner ring 91; the eccentric bearing 8 includes a second outer ring 83, a second inner ring 81 eccentrically arranged inside the second outer ring 83, and a second ball 82 rollingly arranged between the second outer ring 83 and the second inner ring 81. The eccentricity between the second outer ring 83 and the second inner ring 81 is 0.1mm-0.3mm.

[0050] The eccentric bearing 8 and the concentric bearing 9 are both linearly arranged on the experimental platform 1 via a split bearing seat 3. The split bearing seat 3 includes a bearing base fixed to the top of the experimental platform 1 and a bearing upper end cover detachably arranged on the top of the bearing base via bolts. An eccentric bearing 8 or a concentric bearing 9 is arranged between the bearing base and the bearing upper end cover; multiple split bearing seats 3 are coaxially arranged and have the same size.

[0051] The coupling is an Oldham coupling 5, which includes a left mounting disk 51, an intermediate flexible disk 52 and a right mounting disk 53. One side of the left mounting disk 51 is interference fit with the rotor shaft 22 of the permanent magnet synchronous motor 2, and the other side is connected to one side of the intermediate flexible disk 52 via a slot, and the other side of the intermediate flexible disk 52 is connected to one side of the right mounting disk 53 via a slot, and the other side of the right mounting disk 53 is interference fit with the flywheel shaft 61.

[0052] The information acquisition and processing mechanism includes a host computer, a vibration sensor group 7 for collecting vibration information of the flywheel 6 and the permanent magnet synchronous motor 2, a temperature sensor group for collecting temperature information of the permanent magnet synchronous motor 2, and a torque speed sensor 4 for collecting the output torque of the permanent magnet synchronous motor 2. The vibration sensor group 7, the temperature sensor group and the torque speed sensor 4 are all in communication with the host computer, and are used to analyze the charging and discharging efficiency of the energy storage system under eccentricity fault according to the collected vibration information and temperature; the vibration sensor group 7 includes a first vibration sensor 71 arranged on the flywheel shaft 61, a second vibration sensor 72 arranged on the rotor shaft 22 of the permanent magnet synchronous motor 2, a third vibration sensor 73 arranged on the stator 21 of the permanent magnet synchronous motor 2, and a fourth vibration sensor arranged at the protruding end of the stator winding of the permanent magnet synchronous motor 2; the temperature sensor group includes a plurality of temperature sensors uniformly distributed on the stator end face of the permanent magnet synchronous motor 2 in a circular array; the torque speed sensor 4 is connected between the rotor shaft 22 of the permanent magnet synchronous motor 2 and the flywheel shaft 61 via an elastic coupling 10.

[0053] The experimental method of the flywheel 6 eccentricity fault simulation experimental system under high-speed rotation conditions includes the following steps:

[0054] S1, manufacturing a plurality of eccentric bearings 8 with different eccentricity values;

[0055] In step S1 , three eccentric bearings 8 are manufactured. The eccentricity values ​​of the three eccentric bearings 8 are 0.1 mm, 0.2 mm, and 0.3 mm, respectively.

[0056] S2. Assembly:

[0057] The permanent magnet synchronous motor 2 is fixed on the experimental platform 1 by bolts, and the two ends of the rotor shaft 22 are respectively connected to the concentric bearings 9, and then connected to the flywheel 6 through the coupling and the eccentric bearing 8, and another eccentric bearing 8 is connected to the side of the flywheel 6 away from the permanent magnet synchronous motor 2;

[0058] S3, turning on the permanent magnet synchronous motor 2, and using the vector inverter to control the speed of the permanent magnet synchronous motor 2 to increase uniformly until the set speed is reached;

[0059] In step S3, the set rotation speed is 18000 r / min.

[0060] S4, using the vibration sensor group 7, the temperature sensor group, the torque sensor and the voltage and current sensor to respectively collect the vibration information of the flywheel 6, the vibration information of the permanent magnet synchronous motor 2, the temperature information of the permanent magnet synchronous motor 2, the output torque and the voltage and current information of the permanent magnet synchronous motor 2, and transmit the collected data to the host computer;

[0061] S5. The host computer analyzes the vibration response and charging and discharging efficiency of the energy storage system under the eccentricity fault according to the received vibration information, temperature information, output torque, and voltage and current information;

[0062] When analyzing the charging and discharging efficiency, it is first necessary to clarify the input / output energy of the energy storage system. Usually, the input / output energy is measured by using an electricity meter. In the process of the energy storage system increasing from the minimum speed to the maximum speed, that is, the charging process, the electricity meter is used to measure the electric energy consumed on the grid side during the process. Similarly, in the discharge process, that is, the process of the flywheel 6 decreasing from the maximum speed to the minimum speed, the electricity meter is used to record the energy transmitted back to the grid by the flywheel 6.

[0063] The calculation method of the charging and discharging efficiency of the energy storage system in step S5 is as follows:

[0064]

[0065] In the formula, the released energy represents the energy transmitted back to the grid by the flywheel 6 during the energy discharge process; the stored energy represents the electric energy consumed by the grid side during the energy charging process.

[0066] By calculating the charging and discharging efficiency of the energy storage system, the energy conversion efficiency of the energy storage system during the charging and discharging process can be evaluated. That is, the higher the charging and discharging efficiency, the smaller the energy loss of the energy storage system during the charging and discharging process, and the better the overall performance of the energy storage system.

[0067] S6, replace the eccentric bearing 8, repeat steps S2-S3, detect the vibration response and charging and discharging efficiency of the energy storage system under the eccentric bearing 8, until all eccentric bearings 8 are tested, and the influence of the eccentricity fault of the output flywheel 6 on the permanent magnet synchronous motor 2 is determined;

[0068] In this embodiment, the eccentricity fault of the flywheel 6 energy storage system can also be analyzed, and its main process is as follows:

[0069] First, vibration sensors and temperature sensors are used to monitor parameters such as vibration, noise and temperature of the energy storage system. At this time, the vibration sensor can be installed on the stator and rotor of the motor, the stator winding, the flywheel 6 near the eccentric bearing 8 or on the eccentric bearing 8 support seat to capture vibration signals at different positions; the temperature sensor can be installed near the stator winding of the permanent magnet synchronous motor 2 to monitor the temperature changes of key components.

[0070] Then, signal processing techniques such as time-frequency analysis (such as Fourier transform (FFT) and wavelet transform, which can analyze the time-frequency characteristics of the signal and reveal the characteristics of the eccentricity fault) are used to extract the fault characteristics. Then, by analyzing the frequency and amplitude of the vibration signal, the characteristics of the vibration signal under the eccentricity fault are identified, such as specific frequency components and amplitude changes.

[0071] Finally, verify the characteristics of the vibration signal under the eccentricity fault: By comparing the characteristics of the vibration signals during normal operation and under different eccentricity faults, not only the existence of the eccentricity fault can be determined, but also the degree of the eccentricity fault can be verified.

[0072] Therefore, the present invention adopts the above-mentioned flywheel eccentricity fault simulation experimental system and experimental method under high-speed rotation conditions, which can simulate the eccentricity fault of the flywheel energy storage system under high-speed rotation conditions. The obtained results are more in line with reality and provide a scientific basis for the subsequent intelligent operation and maintenance of the flywheel energy storage system.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. The flywheel eccentricity fault simulation experimental system under high-speed rotation conditions is characterized by: It includes a platform experiment mechanism and an information collection and processing mechanism. The platform experiment mechanism includes an experiment platform and a permanent magnet synchronous motor and a flywheel axially arranged on the top of the experiment platform in sequence. The permanent magnet synchronous motor and the flywheel are connected via a coupling, and both ends of the flywheel shaft of the flywheel are vertically rotatably connected to the experiment platform via eccentric bearings. The permanent magnet synchronous motor is electrically connected to the vector inverter; Information collection and processing mechanism, used to monitor the vibration and temperature of the platform experimental mechanism, and analyze the charging and discharging efficiency of the energy storage system under eccentric fault; The information collection and processing mechanism includes a host computer, a vibration sensor group for collecting vibration information of the flywheel and the permanent magnet synchronous motor, a temperature sensor group for collecting temperature information of the permanent magnet synchronous motor, a torque speed sensor for collecting output torque of the permanent magnet synchronous motor, and a voltage and current sensor for collecting electrical quantity information of the permanent magnet synchronous motor. The vibration sensor group, the temperature sensor group, the torque speed sensor, and the voltage and current sensor are all in communication with the host computer, and are used to analyze the fault information of the eccentric energy storage system according to the collected vibration information and temperature, and analyze the charge and discharge efficiency of the energy storage system according to the data of the voltage and current sensors; The vibration sensor group includes a first vibration sensor arranged on a split bearing seat of a flywheel shaft, a second vibration sensor arranged on a split bearing seat of a rotor shaft of a permanent magnet synchronous motor, a third vibration sensor arranged on a stator of the permanent magnet synchronous motor, and a fourth vibration sensor arranged on an extended end of a stator winding of the permanent magnet synchronous motor; The temperature sensor group includes a plurality of temperature sensors uniformly distributed on the stator end surface of the permanent magnet synchronous motor in a circumferential array; The torque and speed sensor is connected between the rotor shaft and the flywheel shaft of the permanent magnet synchronous motor via an elastic coupling.

2. The flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to claim 1 is characterized in that: Both ends of the rotor shaft of the permanent magnet synchronous motor are rotatably arranged on the top of the experimental platform via concentric bearings, and the rotor shaft near one end of the flywheel passes through the concentric bearing and is connected to the flywheel shaft passing through the eccentric bearing via a coupling; The concentric bearing comprises a first outer ring, a first inner ring concentrically arranged inside the first outer ring, and a first ball disposed between the first outer ring and the first inner ring; The eccentric bearing comprises a second outer ring, a second inner ring eccentrically arranged inside the second outer ring, and second balls rollingly arranged between the second outer ring and the second inner ring.

3. The flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to claim 2 is characterized in that: The eccentricity between the second outer ring and the second inner ring is 0.1 mm to 0.3 mm.

4. The flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to claim 1 is characterized in that: The eccentric bearing and the concentric bearing are both linearly arranged on the experimental platform via a split bearing seat. The split bearing seat includes a bearing base fixed to the top of the experimental platform and a bearing upper end cover detachably arranged on the top of the bearing base via bolts. An eccentric bearing or a concentric bearing is arranged between the bearing base and the bearing upper end cover. Multiple split bearing seats are coaxially arranged.

5. The flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to claim 4 is characterized in that: The coupling is an Oldham coupling, which includes a left mounting plate, a middle flexible plate and a right mounting plate. One side of the left mounting plate has an interference fit with the rotor shaft of the permanent magnet synchronous motor, and the other side is connected to one side of the middle flexible plate through a slot, the other side of the middle flexible plate is connected to one side of the right mounting plate through a slot, and the other side of the right mounting plate has an interference fit with the flywheel shaft.

6. The experimental method of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to any one of claims 1 to 5 comprises the following steps: S1. Manufacturing a plurality of eccentric bearings with different eccentricity values; S2. Assembly: The permanent magnet synchronous motor is fixed on the experimental platform with bolts, and the two ends of the rotor shaft are connected to concentric bearings respectively, and then connected to the flywheel through a coupling and an eccentric bearing, and another eccentric bearing is connected to the side of the flywheel away from the permanent magnet synchronous motor; S3, turn on the permanent magnet synchronous motor, and use the vector inverter to control the speed of the permanent magnet synchronous motor to increase evenly until it reaches the set speed of 18000r / min; S4, using a vibration sensor group, a temperature sensor group, a torque sensor and a voltage and current sensor to respectively collect flywheel vibration information, permanent magnet synchronous motor vibration information, permanent magnet synchronous motor temperature information, output torque and voltage and current information of the permanent magnet synchronous motor, and transmit the collected data to a host computer; S5. The host computer analyzes the vibration response and charging and discharging efficiency of the energy storage system under the eccentricity fault according to the received vibration information, temperature information, output torque, and voltage and current information; The calculation method of the charging and discharging efficiency of the energy storage system in step S5 is as follows: In the formula, the released energy represents the electric energy transmitted back to the grid by the flywheel during the discharge process; the stored energy represents the electric energy consumed by the grid side during the charging process; S6. Replace the eccentric bearing and repeat steps S2-S3 to detect the vibration response and charging and discharging efficiency of the energy storage system under this eccentric bearing until all eccentric bearings are tested and the influence of the flywheel eccentricity fault on the permanent magnet synchronous motor is determined.

7. The experimental method of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to claim 6 is characterized in that: In step S1, three eccentric bearings are manufactured, and the eccentricity values ​​of the three eccentric bearings are 0.1 mm, 0.2 mm, and 0.3 mm, respectively.

8. The experimental method of the flywheel eccentricity fault simulation experimental system under high-speed rotation conditions according to claim 6 is characterized in that: In step S3, the set rotation speed is 18000 r / min.

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