A device and method for simulating air gap eccentricity of a permanent magnet wind turbine based on a shaft sleeve

Abstract

The present invention discloses a permanent magnet wind generator air gap eccentricity simulation device and method based on a shaft sleeve, belonging to the technical field of motors; comprising a drive motor and a permanent magnet wind generator, the drive motor and the permanent magnet wind generator are both arranged on a bottom plate, the permanent magnet wind generator comprises a stator and an input rotor, the output shaft of the drive motor is connected to the input rotor of the permanent magnet wind generator through a coupling, both ends of the input rotor are provided with bearing seats, the bearing seats comprise an upper fixed seat and a lower fixed seat connected by bolts, and a test bearing is sleeved between the upper fixed seat and the lower fixed seat. The present invention adopts the above structure and method, the device is simple and easy to use, and can realize the simulation of five types of air gap eccentricity faults, namely, air gap dynamic eccentricity, air gap radial static eccentricity, air gap single-sided oblique eccentricity, air gap double-sided oblique eccentricity, and air gap dynamic and static mixed eccentricity, and can provide experimental simulation data support for the monitoring of air gap eccentricity faults.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a device and method for simulating air gap eccentricity of a permanent magnet wind generator based on a shaft sleeve. Background Art

[0002] Under the background of the country's major demand for green and efficient energy transformation, reliable and stable wind power output is an important guarantee for building a green China and achieving carbon neutrality. In the long-term operation of permanent magnet wind turbines, air gap eccentricity faults will occur due to bearing wear. Air gap eccentricity faults aggravate stator vibration and winding temperature, so it is urgent to conduct experimental research on the electromagnetic, mechanical and temperature characteristics of permanent magnet wind turbines under air gap eccentricity faults. However, most of the current experimental units for air gap eccentricity faults focus on adjusting the stator position to achieve eccentricity. This type of method has complex equipment and low adjustment accuracy. Summary of the invention

[0003] The purpose of the present invention is to provide a permanent magnet wind turbine air gap eccentricity simulation device and method based on a shaft sleeve. The device is simple and easy to use. It only requires the cooperation of an inner shaft sleeve and an outer shaft sleeve to realize the simulation of five types of air gap eccentricity faults, namely, air gap dynamic eccentricity, air gap radial static eccentricity, air gap single-sided oblique eccentricity, air gap double-sided oblique eccentricity, and air gap dynamic and static mixed eccentricity, thereby providing experimental simulation data support for the monitoring of air gap eccentricity faults.

[0004] To achieve the above-mentioned purpose, the present invention provides a permanent magnet wind generator air gap eccentricity simulation device based on a shaft sleeve, comprising a drive motor and a permanent magnet wind generator, wherein the drive motor and the permanent magnet wind generator are both arranged on a base plate, the permanent magnet wind generator comprises a stator and an input rotor, the output shaft of the drive motor is connected to the input rotor of the permanent magnet wind generator through a coupling, bearing seats are arranged at both ends of the input rotor, the bearing seat comprises an upper fixed seat and a lower fixed seat connected by bolts, and a test bearing is sleeved between the upper fixed seat and the lower fixed seat.

[0005] Preferably, the test bearing comprises a rotor bearing, the inner ring of the rotor bearing is provided with an inner sleeve, the outer ring of the rotor bearing is provided with an outer sleeve, and the sleeve thickness of the inner sleeve and the outer sleeve is set to be uniform or non-uniform.

[0006] A method for simulating air gap eccentricity of a permanent magnet wind turbine based on a shaft sleeve comprises the following steps:

[0007] S1: For permanent magnet wind turbines, there are two working conditions, normal condition and eccentric condition. The normal condition is one, and the eccentric condition includes five types, namely, dynamic eccentricity of air gap, radial static eccentricity of air gap, single-sided oblique eccentricity of air gap, double-sided oblique eccentricity of air gap and dynamic-static mixed eccentricity of air gap. The simulation of these five types of air gap eccentricity faults is simulated by adjusting the wall thickness of two outer sleeves and two inner sleeves. The specific simulation process is as follows:

[0008] S2: Normal situation simulation, two inner sleeves with uniform thickness and two outer sleeves with uniform thickness are respectively sleeved on the inner ring and outer ring of the rotor bearing, and the driving motor drives the permanent magnet wind turbine to rotate, and the normal situation simulation is completed;

[0009] S3: Air gap dynamic eccentricity simulation, changing the thickness of the two ends of the two inner sleeves to form a larger thickness on one side and a smaller thickness on the other side, the air gap dynamic eccentricity simulation is completed, and the thickness of the inner sleeve is changed to achieve different degrees of air gap dynamic eccentricity simulation;

[0010] S4: Simulation of radial static eccentricity of the air gap. At the same time, the thickness of the two ends of the outer sleeve is changed to form a larger thickness on one side and a smaller thickness on the other side. The simulation of radial static eccentricity of the air gap is completed. The two outer sleeves are rotated to change the direction of the side with the smallest thickness to simulate the radial static eccentricity of the air gap at different eccentric positions. The thickness of the outer sleeve is changed to achieve different degrees of radial static eccentricity simulation of the air gap.

[0011] S5: Simulation of single-sided oblique eccentricity of air gap. The thickness of the outer sleeve at one end of the input shaft rotor is changed to form an outer sleeve with a larger thickness on one side and a smaller thickness on the other side. The thickness of the other outer sleeve remains unchanged. The thickness of the outer sleeve is changed to achieve simulation of single-sided oblique eccentricity of air gap to different degrees.

[0012] S6: Simulation of double-sided oblique eccentricity of the air gap. The thickness of the outer sleeves on both sides is changed to form two outer sleeves with one side thicker and the other side thinner. The minimum thickness direction of the two outer sleeves on the bearing seats on both sides is adjusted to be 180° apart. The thickness of the outer sleeves is changed to achieve different degrees of double-sided oblique eccentricity simulation of the air gap.

[0013] S7: Mixed eccentricity simulation. The thickness of the two inner sleeves and the two outer sleeves on both sides is changed, so that one side of the outer sleeve is thicker and the other side is thinner, and one side of the inner sleeve is thicker and the other side is thinner. The dynamic and static mixed eccentricity simulation of the air gap is completed. The thickness of the outer sleeve and the inner sleeve is changed to achieve different degrees of mixed eccentricity simulation.

[0014] Therefore, the present invention adopts the above-mentioned permanent magnet wind turbine air gap eccentricity simulation device and method based on a shaft sleeve, which has the following advantages:

[0015] (1) In the present invention, the simulation device used has a simple structure and is easy to use. By providing a simple experimental platform that is consistent with the actual operating conditions of the generator, it can be used to simulate different types of air gap eccentricity, different degrees of eccentricity and eccentricity directions in the experiment, thereby providing experimental data and scientific basis for the diagnosis of air gap eccentricity faults of permanent magnet wind turbines.

[0016] (2) In the present invention, an inner sleeve and an outer sleeve are respectively provided inside and outside the rotor bearing. By adjusting whether the wall thickness of the inner sleeve and the outer sleeve is uniform and adjusting the running state of the rotor, five different air gap eccentricity faults can be quickly simulated.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a permanent magnet wind turbine air gap eccentricity simulation platform in a permanent magnet wind turbine air gap eccentricity simulation device based on a shaft sleeve of the present invention;

[0019] Figure 2 It is a schematic diagram of a bearing seat in a permanent magnet wind turbine air gap eccentricity simulation device based on a shaft sleeve of the present invention;

[0020] Figure 3 It is a schematic diagram of an outer shaft sleeve in a shaft sleeve-based air gap eccentricity simulation device of a permanent magnet wind turbine generator according to the present invention;

[0021] Figure 4 Schematic diagram of the rotor bearing in a sleeve-based permanent magnet wind turbine air gap eccentricity simulation device of the present invention

[0022] Figure 5 This is a schematic diagram of an inner shaft sleeve in a shaft sleeve-based air gap eccentricity simulation device for a permanent magnet wind turbine generator according to the present invention;

[0023] Figure 6 It is a schematic diagram of a normal condition of a generator in a method for simulating air gap eccentricity of a permanent magnet wind turbine generator based on a shaft sleeve according to the present invention;

[0024] Figure 7 It is a schematic diagram of the working condition of the dynamic eccentricity of the air gap of the generator in the method for simulating the air gap eccentricity of the permanent magnet wind turbine based on the shaft sleeve of the present invention;

[0025] Figure 8 It is a schematic diagram of the radial static eccentricity of the air gap of the generator in the air gap eccentricity simulation method of the permanent magnet wind turbine based on the shaft sleeve of the present invention;

[0026] Fig. 9 It is a schematic diagram of a single-side oblique eccentricity condition of the air gap of a permanent magnet wind turbine generator in a method for simulating the air gap eccentricity of the shaft sleeve based on the present invention;

[0027] Fig.10 It is a schematic diagram of a generator air gap double-side oblique eccentricity working condition in a permanent magnet wind turbine air gap eccentricity simulation method based on a shaft sleeve of the present invention;

[0028] Fig.11 It is a schematic diagram of a generator air gap dynamic and static mixed eccentricity working condition in a permanent magnet wind turbine air gap eccentricity simulation method based on a shaft sleeve of the present invention;

[0029] Figure numerals: 1, driving motor; 2, coupling; 3, permanent magnet wind turbine; 4, bearing seat; 41, upper fixing seat; 42, lower fixing seat; 5, base plate; 6, rotor bearing; 7, outer sleeve; 8, inner sleeve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. The specific model specifications need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the field, so it will not be described in detail.

[0031] Example

[0032] like Figure 1-Figure 5 The present invention provides a permanent magnet wind generator air gap eccentricity simulation device based on a shaft sleeve, comprising a drive motor 1 and a permanent magnet wind generator 3, both of which are arranged on a bottom plate 5, the permanent magnet wind generator 3 comprising a stator and an input rotor, the output shaft of the drive motor 1 is connected to the input rotor of the permanent magnet wind generator 3 through a coupling 2, both ends of the input rotor are provided with bearing seats 4, the bearing seats 4 are used to support the input rotor, the bearing seats 4 comprise an upper fixing seat 41 and a lower fixing seat 42 connected by bolts, and a test bearing is sleeved between the upper fixing seat 41 and the lower fixing seat 42;

[0033] The test bearing includes a rotor bearing 6, an inner ring of the rotor bearing 6 is provided with an inner sleeve 8, an outer ring of the rotor bearing 6 is provided with an outer sleeve 7, the sleeve thickness of the inner sleeve 8 and the outer sleeve 7 is set to be uniform or non-uniform, and the thickness of the inner and outer sleeves 7 is replaced by a detachable bearing seat 4, so as to simulate different types and directions of air gap eccentricity;

[0034] A method for simulating air gap eccentricity of a permanent magnet wind turbine generator based on a shaft sleeve adopts the above-mentioned air gap eccentricity simulation device of a permanent magnet wind turbine generator based on a shaft sleeve, and comprises the following steps:

[0035] S1: For permanent magnet wind turbines, there are two working conditions, normal condition and eccentric condition. The normal condition is one, and the eccentric condition includes five types, namely, dynamic eccentricity of air gap, radial static eccentricity of air gap, single-sided oblique eccentricity of air gap, double-sided oblique eccentricity of air gap and dynamic-static mixed eccentricity of air gap. The simulation of these five types of air gap eccentricity faults is simulated by adjusting the wall thickness of two outer sleeves and two inner sleeves. The specific simulation process is as follows:

[0036] S2: Normal situation simulation, such as Figure 6 , two inner sleeves with uniform thickness and two outer sleeves with uniform thickness are respectively put on the inner ring and outer ring of the rotor bearing, the center of the rotor is aligned with the center of the stator, the generator has no air gap eccentricity fault, the driving motor drives the permanent magnet wind turbine to rotate, and the normal simulation is completed;

[0037] S3: Air gap dynamic eccentricity simulation, such as Figure 7 , δ d The relative dynamic eccentricity of the rotor offset. When the thickness of the two inner sleeves at both ends is changed at the same time, one side has a larger thickness and the other side has a smaller thickness. The air gap length of the generator is no longer uniform, and an air gap eccentricity fault occurs. Since the inner sleeve is nested in the inner ring of the bearing and rotates with the rotation of the rotor, the minimum position of the air gap changes all the time. At this time, the type of air gap eccentricity fault is an air gap dynamic eccentricity fault. Changing the thickness of the inner sleeve can achieve different degrees of air gap dynamic eccentricity simulation.

[0038] S4: Air gap radial static eccentricity simulation, such as Figure 8 , δ s is the relative static eccentricity value of the rotor offset. When the thickness of both ends of the outer sleeve is changed at the same time, one side has a larger thickness and the other side has a smaller thickness. The air gap length of the generator is no longer uniform, and an air gap eccentricity fault occurs. Since the outer sleeve is installed on the outer ring of the rotor bearing, the minimum position of the air gap is fixed. At this time, the type of air gap eccentricity fault is the radial static eccentricity of the air gap, and the direction of the side with the smallest thickness can be changed by rotating the two outer sleeves. At this time, the direction of the air gap eccentricity also changes accordingly, and the range of change is 0° to 360°. Changing the thickness of the outer sleeve 7 can achieve different degrees of radial static eccentricity simulation of the air gap;

[0039] S5: Simulation of one-sided oblique eccentricity of the air gap, such as Fig. 9, θ1 is the rotor tilt angle under the condition of single-sided eccentricity of the air gap. When the thickness of the outer sleeve on one side is changed, one side of the outer sleeve has a larger thickness and a smaller thickness, while the other outer sleeve has a uniform thickness. The air gap length of the generator is also no longer uniform, and an air gap eccentricity fault occurs. Since the outer sleeve is installed on the outer ring of the rotor bearing, the minimum position of the air gap is fixed. At this time, the type of air gap eccentricity fault is static air gap eccentricity. More specifically, the air gap length of the generator changes along the axial direction, and the x-axis or y-axis direction of the air gap length decreases with the increase of the axial length. This special static air gap eccentricity fault can be called single-sided eccentricity of the air gap. Changing the thickness of the outer sleeve can achieve different degrees of single-sided eccentricity simulation of the air gap. The tilt angle range of single-sided eccentricity is g0 is the generator air gap length, l is the stator core length;

[0040] S6: Simulation of double-sided oblique eccentricity of the air gap, such as Fig.10 , θ2 is the rotor inclination angle under the condition of double-sided oblique eccentricity of the air gap. When the thickness of the outer sleeves on both sides is changed, the thickness of the two outer sleeves is larger on one side and smaller on the other side. The air gap length of the generator is also no longer uniform. The minimum thickness directions of the two outer sleeves on the bearing seats on both sides are adjusted to differ by 180°. The generator has an air gap eccentricity fault. Since the outer sleeve is installed on the outer ring of the rotor bearing, the minimum position of the air gap is fixed. At this time, the type of air gap eccentricity fault is static air gap eccentricity. More specifically, the air gap length of the generator changes along the axial direction. The x-axis direction or y-axis direction of the air gap length first increases and then decreases. This special air gap static eccentricity fault can be called double-sided oblique eccentricity of the air gap. Changing the thickness of the outer sleeve can achieve the adjustment of different degrees of double-sided oblique eccentricity of the air gap. The inclination angle range of the double-sided oblique eccentricity is g0 is the generator air gap length, l is the stator core length;

[0041] S7: Hybrid eccentricity simulation, e.g. Fig.11 , δ d is the relative dynamic eccentricity of the rotor, δ s is the relative static eccentricity value of the rotor offset. When the thickness of the four inner and outer sleeves on both sides are changed at the same time, the thickness of the outer sleeve on one side is larger and the thickness of the other side is smaller, and the thickness of the inner sleeve on one side is larger and the thickness of the other side is smaller. The air gap length of the generator is no longer uniform, and an air gap eccentricity fault occurs. At this time, the type of air gap eccentricity fault is a mixed dynamic and static eccentricity of the air gap. Changing the thickness of the outer and inner sleeves can achieve different degrees of mixed eccentricity simulation.

[0042] Therefore, the present invention adopts a permanent magnet wind turbine air gap eccentricity simulation device and method based on a sleeve. The device is simple and easy to use. It only needs to adjust the wall thickness of the inner sleeve and the outer sleeve to realize the simulation of five types of air gap eccentricity faults, namely, air gap dynamic eccentricity, air gap radial static eccentricity, air gap single-sided oblique eccentricity, air gap double-sided oblique eccentricity, and air gap dynamic and static mixed eccentricity. It can provide experimental simulation data support for the monitoring of air gap eccentricity faults.

[0043] 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. A permanent magnet wind turbine air gap eccentricity simulation device based on a shaft sleeve, characterized in that: It includes a drive motor and a permanent magnet wind generator, both of which are arranged on a bottom plate, the permanent magnet wind generator includes a stator and an input rotor, the output shaft of the drive motor is connected to the input rotor of the permanent magnet wind generator through a coupling, both ends of the input rotor are provided with bearing seats, the bearing seats include an upper fixing seat and a lower fixing seat connected by bolts, and a test bearing is sleeved between the upper fixing seat and the lower fixing seat; The test bearing comprises a rotor bearing, the inner ring of the rotor bearing is provided with an inner sleeve, the outer ring of the rotor bearing is provided with an outer sleeve, and the sleeve thickness of the inner sleeve and the outer sleeve is set to be uniform or non-uniform; The simulation steps of the simulation device include the following: S1: For permanent magnet wind turbines, there are two working conditions, normal condition and eccentric condition. The normal condition is one, and the eccentric condition includes five types, namely, dynamic eccentricity of air gap, radial static eccentricity of air gap, single-sided oblique eccentricity of air gap, double-sided oblique eccentricity of air gap and dynamic-static mixed eccentricity of air gap. The simulation of these five types of air gap eccentricity faults is simulated by adjusting the wall thickness of two outer sleeves and two inner sleeves. The specific simulation process is as follows: S2: Normal situation simulation, two inner sleeves with uniform thickness and two outer sleeves with uniform thickness are respectively sleeved on the inner ring and outer ring of the rotor bearing, and the driving motor drives the permanent magnet wind turbine to rotate, and the normal situation simulation is completed; S3: Air gap dynamic eccentricity simulation, changing the thickness of the two ends of the two inner sleeves to form a larger thickness on one side and a smaller thickness on the other side, the air gap dynamic eccentricity simulation is completed, and the thickness of the inner sleeve is changed to achieve different degrees of air gap dynamic eccentricity simulation; S4: Simulation of radial static eccentricity of the air gap. At the same time, the thickness of the two ends of the outer sleeve is changed to form a larger thickness on one side and a smaller thickness on the other side. The simulation of radial static eccentricity of the air gap is completed. The two outer sleeves are rotated to change the direction of the side with the smallest thickness to simulate the radial static eccentricity of the air gap at different eccentric positions. The thickness of the outer sleeve is changed to achieve different degrees of radial static eccentricity simulation of the air gap. S5: Simulation of single-sided oblique eccentricity of air gap. The thickness of the outer sleeve at one end of the input shaft rotor is changed to form an outer sleeve with a larger thickness on one side and a smaller thickness on the other side. The thickness of the other outer sleeve remains unchanged. The thickness of the outer sleeve is changed to achieve simulation of single-sided oblique eccentricity of air gap to different degrees. S6: Simulation of double-sided oblique eccentricity of the air gap. The thickness of the outer sleeves on both sides is changed to form two outer sleeves with one side thicker and the other side thinner. The minimum thickness direction of the two outer sleeves on the bearing seats on both sides is adjusted to be 180° apart. The thickness of the outer sleeves is changed to achieve different degrees of double-sided oblique eccentricity simulation of the air gap. S7: Mixed eccentricity simulation. The thickness of the two inner sleeves and the two outer sleeves on both sides is changed, so that one side of the outer sleeve is thicker and the other side is thinner, and one side of the inner sleeve is thicker and the other side is thinner. The dynamic and static mixed eccentricity simulation of the air gap is completed. The thickness of the outer sleeve and the inner sleeve is changed to achieve different degrees of mixed eccentricity simulation.

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