Fault detection circuit and wind turbine generator system
Patent Information
- Application Number
- CN202522537804.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0004]本申请的主要目的在于提供一种故障检测电路及风力发电机组，旨在解决故障检测电路的准确性不高的技术问题
[0015]This application provides a fault detection circuit, including a vibration detection unit disposed at a vibration detection position of a gear, used to detect the vibration signal of the gear; a gear contact unit disposed at a contact detection position of the gear, used to detect the contact signal of the gear; a speed detection unit disposed at a speed detection position of the gear, used to detect the speed signal of the gear; and a fault detection unit connected to the vibration detection unit, gear contact unit, and speed detection unit, respectively. The fault detection unit is used to determine gear faults based on vibration signals and contact signals and/or determine bearing faults based on vibration signals, speed signals, and contact signals. The detection circuit determines gear faults by using vibration signals detected by the vibration detection unit and contact signals detected by the gear contact unit, and/or determines bearing faults by using vibration signals, speed signals detected by the speed detection unit, and contact signals. It can accurately distinguish between gear faults and/or bearing faults, and can also combine multiple signals to ensure the accuracy of detection. This avoids the phenomenon that relying solely on vibration signals as a detection condition can lead to a one-sided fault detection (for example, the transmission chain in a wind turbine is complex, and vibration signals can cause interference). In other words, it determines gear faults based on vibration signals and contact signals, and/or determines bearing faults based on vibration signals, speed signals, and contact signals, thereby achieving fault detection for both bearings and gears and improving the accuracy of the fault detection circuit.
Smart Images
Figure CN224770371U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of fault detection technology, and in particular to a fault detection circuit and a wind turbine generator set. Background Technology
[0002] With the increasing popularity of wind turbine generators, users have also raised higher requirements for the design of fault detection circuits on wind turbine generators.
[0003] Traditional fault detection circuits are designed based on vibration signal detection of bearings and gears to determine whether they are faulty. This design has certain drawbacks. Relying solely on vibration signals as a detection condition can lead to a one-sided fault detection approach (for example, the complex transmission chain in a wind turbine generator can cause interference from vibration signals). In other words, this design method results in a one-sided fault detection approach due to its reliance on vibration signals, leading to low accuracy in fault detection circuits. Utility Model Content
[0004] The main purpose of this application is to provide a fault detection circuit and a wind turbine generator set, aiming to solve the technical problem of low accuracy of fault detection circuits.
[0005] To achieve the above objectives, this application provides a fault detection circuit, the fault detection circuit comprising: A vibration detection unit is provided, which is located at the vibration detection position of the gear and is used to detect the vibration signal of the gear. A gear contact unit is disposed at the contact detection position of the gear and is used to detect the contact signal of the gear. A speed detection unit is disposed at the speed detection position of the gear, and the speed detection unit is used to detect the speed signal of the gear. A fault detection unit is provided, which is connected to the vibration detection unit, the gear contact unit, and the speed detection unit respectively. The fault detection unit is used to determine gear faults based on the vibration signal and the contact signal and / or determine bearing faults based on the vibration signal, the speed signal, and the contact signal.
[0006] In one embodiment, the vibration detection unit includes: A vibration sensor is disposed at the vibration detection position of the gear and is connected to the fault detection unit. The vibration sensor is configured to output a high level when the vibration frequency is greater than a preset frequency. The vibration detection position includes the side of the gear.
[0007] In one embodiment, the gear includes a primary gear and an auxiliary gear, and the gear contact unit includes: A first wire covers each gear block of the main gear, and a first end of the first wire is connected to a first power source, and a second end of the first wire is grounded, wherein the first power source is disposed on the side of the main gear. The second wire covers each gear block of the auxiliary gear; A contact detection subunit, wherein the first end of the contact detection subunit is connected to the second wire, and the second end of the contact detection subunit is connected to the fault detection unit.
[0008] In one embodiment, the contact detection subunit includes: A voltage amplifier, wherein a first terminal of the voltage amplifier is connected to the second wire; A first switching transistor, the third terminal of which is connected to the second terminal of the voltage amplifier, and the second terminal of which is connected to a second power supply; A timer, the first end of which is connected to the second end of the first switching transistor, and the second end of which is connected to the fault detection unit.
[0009] In one embodiment, the fault detection circuit further includes: A wireless transmitter, wherein the wireless transmitter is connected to the second end of the timer; A wireless receiver, which is connected to the fault detection unit, or; A third wire, the first end of which is connected to the second end of the timer; A coaxial component, wherein the first end of the coaxial component is slidably connected to the second end of the third conductor, and the second end of the coaxial component is connected to the fault detection unit.
[0010] In one embodiment, the speed detection unit includes: A speed sensor is disposed at the speed detection position of the gear and is connected to the fault detection unit, wherein the speed detection position includes the side of the gear.
[0011] In one embodiment, the fault detection unit includes: The fault detector has its first terminal connected to the speed sensor and motor controller in the speed detection unit. When the motor speed value of the motor controller is greater than the gear speed of the speed sensor, the third terminal of the fault detector outputs a high level. The second terminal of the fault detector is connected to the second terminal of the timer in the gear contact unit. When the timing value of the timer is not within a preset range, the fourth terminal of the fault detector outputs a high level. A bearing detection subunit is provided, which is connected to the third end of the fault detector, the fourth end of the fault detector, and the vibration sensor in the vibration detection unit. A gear detection subunit is provided, which is connected to the fourth end of the fault detector and the vibration sensor.
[0012] In one embodiment, the gear detection subunit includes: Gear fault indicator light, the negative terminal of which is grounded; The second switch is connected to the fourth terminal of the fault detector, and the first terminal of the second switch is connected to the positive terminal of the gear fault indicator light. The third switch is connected to the vibration sensor at its third terminal, and the first terminal of the third switch is connected to the second terminal of the second switch. The second terminal of the third switch is connected to the power supply.
[0013] In one embodiment, the bearing detection subunit includes: The bearing fault indicator light has its negative terminal grounded. The fourth switch is connected to the third terminal of the fault detector, and the first terminal of the fourth switch is connected to the positive terminal of the bearing fault indicator light. The fifth switch is connected to the vibration sensor at its third terminal, and to the power supply at its first terminal. The sixth switch is connected to the fourth terminal of the fault detector, the first terminal of the sixth switch is connected to the positive terminal of the bearing fault indicator light, and the second terminal of the sixth switch is connected to the negative terminal of the bearing fault indicator light.
[0014] In addition, to achieve the above objectives, this application also provides a wind turbine generator set, which includes the aforementioned fault detection circuit.
[0015] This application provides a fault detection circuit, including a vibration detection unit disposed at a vibration detection position of a gear, used to detect the vibration signal of the gear; a gear contact unit disposed at a contact detection position of the gear, used to detect the contact signal of the gear; a speed detection unit disposed at a speed detection position of the gear, used to detect the speed signal of the gear; and a fault detection unit connected to the vibration detection unit, gear contact unit, and speed detection unit, respectively. The fault detection unit is used to determine gear faults based on vibration signals and contact signals and / or determine bearing faults based on vibration signals, speed signals, and contact signals. The detection circuit determines gear faults by using vibration signals detected by the vibration detection unit and contact signals detected by the gear contact unit, and / or determines bearing faults by using vibration signals, speed signals detected by the speed detection unit, and contact signals. It can accurately distinguish between gear faults and / or bearing faults, and can also combine multiple signals to ensure the accuracy of detection. This avoids the phenomenon that relying solely on vibration signals as a detection condition can lead to a one-sided fault detection (for example, the transmission chain in a wind turbine is complex, and vibration signals can cause interference). In other words, it determines gear faults based on vibration signals and contact signals, and / or determines bearing faults based on vibration signals, speed signals, and contact signals, thereby achieving fault detection for both bearings and gears and improving the accuracy of the fault detection circuit. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the framework of the first embodiment of the fault detection circuit of this application; Figure 2 This is a schematic diagram of the framework of the second embodiment of the fault detection circuit of this application; Figure 3 This is a schematic diagram of a scenario in the second embodiment of the fault detection circuit of this application; Figure 4 This is another scenario diagram of the second embodiment of the fault detection circuit of this application; Figure 5 This is a schematic diagram of the framework of the third embodiment of the fault detection circuit of this application; Figure 6 This is a circuit diagram of the fourth embodiment of the fault detection circuit of this application.
[0017] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.
[0018] Explanation of icon numbers: 200, Gear; 210, Vibration detection position; 220, Contact detection position; 230, Speed detection position; 10, Fault detection unit; 20, Vibration detection unit; 30, Gear contact unit; 40, Speed detection unit; 21, Vibration sensor; 201, Main gear; 202, Auxiliary gear; 211, Gear block of main gear; 212, Gear block of auxiliary gear; 31, First wire; 32, Second wire; 33, First power supply; 34, Contact detection subunit; 341, Voltage amplifier; 342, First switching transistor; 343, Timer; 52, Coaxial component; 51, Third wire; 41, Speed sensor; VCC, Power supply; 11, Fault detector; 12, Gear detection subunit; 13, Bearing detection subunit; D1, Gear fault indicator light; D2, Bearing fault indicator light; Q2, Second switching transistor; Q3, Third switching transistor; Q4, Fourth switching transistor; Q5, Fifth switching transistor; Q6, Sixth switching transistor. Detailed Implementation
[0019] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.
[0020] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.
[0021] Traditional fault detection methods rely on vibration signal detection of bearings and gears 200 to determine if they are faulty. However, due to the complexity of the transmission chain within wind turbine generators, vibrations from other components may cause the bearings and gears 200 to vibrate, or vibrations from other parts may be detected and mistakenly attributed to the bearings and gears 200, leading to misdiagnosis. Furthermore, vibration signals cannot distinguish between bearing and gear 200 faults, resulting in low fault detection accuracy due to false detections and the inability to differentiate between them.
[0022] Therefore, based on the shortcomings of the above fault detection circuits, the fault detection circuit of this application is proposed. The main solution of the embodiments of this application is: to determine the fault of gear 200 by the vibration signal detected by vibration detection unit 20 and the contact signal detected by gear contact unit 30, and / or to determine the bearing fault by the vibration signal, the speed signal detected by speed detection unit 40 and the contact signal. This can accurately distinguish between gear 200 faults and / or bearing faults. It can also combine multiple signals to ensure the accuracy of detection, thereby avoiding the phenomenon that the entire fault detection is relatively one-sided due to the use of vibration signal as the detection condition alone (for example, the transmission chain in the wind turbine generator is complex, and the vibration signal will be interfered with). That is, to determine the fault of gear 200 by vibration signal and contact signal and / or to determine the bearing fault by vibration signal, speed signal and contact signal, thereby realizing the fault detection of bearing and gear 200, and thus improving the accuracy of fault detection circuit.
[0023] Based on this, embodiments of this application provide a fault detection circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the framework of the first embodiment of the fault detection circuit of this application.
[0024] Reference Figure 1 This application provides a fault detection circuit, which includes: Vibration detection unit 20 is set at vibration detection position 210 of gear 200 and is used to detect vibration signal of gear 200. Gear contact unit 30 is disposed at the contact detection position 220 of gear 200 and is used to detect the contact signal of gear 200. Speed detection unit 40 is set at speed detection position 230 of gear 200 and is used to detect speed signal of gear 200. The fault detection unit 10 (which can be input from the same end or different ends) is connected to the vibration detection unit 20, the gear contact unit 30 and the speed detection unit 40 respectively. The fault detection unit 10 is used to determine the gear 200 fault based on the vibration signal and the contact signal and / or to determine the bearing fault based on the vibration signal, the speed signal and the contact signal.
[0025] In this embodiment, a vibration detection unit 20 is set at the vibration detection position 210 of the gear 200. The vibration detection position 210 can be directly set on the gear 200, such as the side of the gear 200 (i.e., the flat surface without the gear 200 block, that is, the position on the gear 200 that is not engaged with other gears 200). For example, a vibration sensor 21 is used to detect the vibration of the gear 200 to feed back the vibration signal to the fault detection unit 10. The vibration signal can be a signal, such as the vibration frequency, or a high or low level. For example, a frequency controller is set in the vibration detection unit 20. When the vibration frequency is greater than the preset frequency, the frequency controller outputs a high level, and when it is not greater than the preset frequency, the frequency controller outputs a low level. The frequency controller can be a microcontroller with a fixed detection program set in it to implement the above detection process. For example, the fault detection circuit also includes a gear contact unit 30, which is located at the contact detection position 220 of the gear 200. This unit can collect the contact information between the two gears 200 as a contact signal. For example, assuming the normal contact duration of the two gears 200 during engagement is A-A+1, if the detected duration exceeds A+1 or is less than A, it indicates a gear 200 fault. This means the gear 200 may be worn down, resulting in a missing piece of gear 200, causing the contact duration to be outside the defined range. A contact signal can then be output. This contact signal can be a single signal, such as the contact duration, or a high / low level. For instance, the gear contact unit 30 can include a contact controller. When the contact duration is within a preset range, the contact controller outputs a low level; when it is outside the preset range, the frequency controller outputs a high level. The contact controller can be a microcontroller with a fixed detection program to implement the above detection process. Furthermore, a speed detection unit 40 is also provided, which is set at the speed detection position 230 of the gear 200, such as the side of the gear 200. For example, a speed sensor 41 is used to detect the speed of the gear 200 and feed back a speed signal to the fault detection unit 10. The speed signal can be a signal, such as a speed value. Then, the speed value is compared with the output speed value of the motor in the fault detection unit 10 to determine whether the two speeds match, and thus determine whether there is a bearing fault. For example, when the bearing is faulty, the bearing can rotate synchronously with the motor, but cannot drive the gear 200 to rotate synchronously, thus forming a situation of different speeds. Alternatively, when the bearing is faulty, the bearing cannot rotate synchronously with the motor. Even if the bearing drives the gear 200 to rotate synchronously, a situation of different speeds will still occur.
[0026] Furthermore, at this point, the vibration signal detected by the vibration detection unit 20, the contact signal detected by the gear contact unit 30, and the speed signal detected by the speed detection unit 40 can be obtained respectively. Then, the gear 200 fault can be determined by combining the vibration signal and the contact signal. That is, it is only when the vibration signal and the contact signal simultaneously meet the fault conditions of the gear 200 that the fault is determined. Similarly, the bearing fault can be determined by combining the vibration signal, speed signal, and contact signal. That is, if the vibration signal and speed signal meet the bearing fault conditions and the contact signal does not indicate a gear 200 fault, then the bearing fault can be determined. This enables separate fault detection of the bearing and gear 200, as well as fault detection by combining multiple data, thereby improving the accuracy of the fault detection circuit.
[0027] In this embodiment, a fault detection circuit is provided, including a vibration detection unit 20, which is disposed at a vibration detection position 210 of a gear 200 and is used to detect the vibration signal of the gear 200; a gear contact unit 30, which is disposed at a contact detection position 220 of the gear 200 and is used to detect the contact signal of the gear 200; a speed detection unit 40, which is disposed at a speed detection position 230 of the gear 200 and is used to detect the speed signal of the gear 200; and a fault detection unit 10, which is connected to the vibration detection unit 20, the gear contact unit 30, and the speed detection unit 40, respectively, and is used to determine a fault in the gear 200 based on the vibration signal and the contact signal and / or based on the vibration signal. This fault detection circuit determines bearing faults by using vibration signals detected by vibration detection unit 20 and contact signals detected by gear contact unit 30 to determine gear 200 faults and / or by using vibration signals, speed signals detected by speed detection unit 40, and contact signals to determine bearing faults. It can accurately distinguish between gear 200 faults and / or bearing faults. It can also combine multiple signals to ensure the accuracy of detection, thereby avoiding the phenomenon that the entire fault detection is relatively one-sided when relying solely on vibration signals as a detection condition (for example, the transmission chain in a wind turbine is complex, and vibration signals may cause interference). In other words, it determines gear 200 faults based on vibration signals and contact signals and / or determines bearing faults based on vibration signals, speed signals, and contact signals, thereby realizing the fault detection of bearings and gear 200, and thus improving the accuracy of the fault detection circuit.
[0028] Furthermore, based on the first embodiment of this application described above, a second embodiment of the fault detection circuit of this application is proposed, referring to... Figure 2 , Figure 2 This is a schematic diagram of the framework of the second embodiment of the fault detection circuit of this application. The vibration detection unit 20 includes: Vibration sensor 21 is set at vibration detection position 210 of gear 200. Vibration sensor 21 is connected to fault detection unit 10. Vibration sensor 21 is set to output a high level when the vibration frequency is greater than a preset frequency. Vibration detection position 210 includes the side of gear 200.
[0029] In this embodiment, the vibration detection unit 20 includes a vibration sensor 21. Of course, other vibration detection instruments can also be used; this embodiment uses the vibration sensor 21 as an example. For example, the vibration sensor 21 is set at the vibration detection position 210 of the gear 200. The gear 200 can be one of multiple gears 200 connected in sequence, or each gear 200 can have a vibration sensor 21. When the vibration sensor 21 is set at the vibration detection position 210 of the gear 200, if a vibration signal is detected, it will be transmitted back to the fault detection unit 10. For example, as described in the above embodiment, the vibration signal can be a signal, such as a vibration frequency, or a high / low level. This will not be repeated here; this embodiment uses a high / low level output as an example. In another embodiment, the vibration detection unit 20 can also be a spring set at the vibration detection position 210 of the gear 200. One side of the spring is connected to a low-voltage source and fixed together with the low-voltage source at the vibration detection position 210 of the gear 200. An iron plate is spaced apart on the other side of the spring and is also connected to the fault detection unit 10. At this time, the working principle of the entire vibration detection unit 20 is that when the vibration is greater than a certain value (actually manifested as a certain vibration force acting on the gear 200), the other side of the spring will contact the iron plate, and then the voltage of the low voltage source will be supplied to the fault detection unit 10 to inform the fault detection unit 10 that the vibration exceeds a certain vibration threshold. Different types of springs or intervals can be selected to design the vibration threshold size, thereby realizing the vibration detection of the gear 200 and providing a basis for subsequent fault detection.
[0030] In one embodiment, reference is made to Figure 3 , Figure 3 This is a schematic diagram of a scenario in the second embodiment of the fault detection circuit of this application. The gear 200 includes a main gear 201 and an auxiliary gear 201, and the gear contact unit 30 includes: The first wire 31 covers each of the 200 gears of the main gear 201, and the first end of the first wire 31 is connected to the first power supply 33, and the second end of the first wire 31 is grounded. The first power supply 33 is located on the side of the main gear 201. The second wire 32 covers each of the 200 gears of the auxiliary gear 201; The contact detection subunit 34 has its first end connected to the second wire 32 and its second end connected to the fault detection unit 10.
[0031] Furthermore, the contact detection subunit 34 includes: Voltage amplifier 341 (common voltage amplifier 341), the first terminal of voltage amplifier 341 is connected to the second wire 32; The first switching transistor 342 has its third terminal connected to the second terminal of the voltage amplifier 341, and its second terminal connected to the second power supply. Timer 343, the first terminal of timer 343 is connected to the second terminal of the first switching transistor 342, and the second terminal of timer 343 is connected to the fault detection unit 10.
[0032] In this embodiment, the gear contact unit 30 primarily detects the contact duration of the gears 200. Each time the gear 200 rotates, there is contact between gear blocks 200, resulting in wires covering the gear blocks of the main gear 201 and auxiliary gear 201. When the wires between the two gears 200 make contact, the other gear 200 without the first power supply 33 receives a voltage. The contact duration is then determined based on the duration of the voltage. For example, placing the contact unit on each gear block has the advantage that when the gear block wears, it wears down the wires, causing a change in the contact duration, thus enabling gear 200 fault detection. (See also...) Figure 3The white squares represent gears 200 in contact, with the middle gear 200 in contact and the adjacent gears 200 not in contact. The black lines represent wires that can be embedded in the gears 200, but some exposed portions are required. The wires on each gear 200 can wrap around each gear 200 one or more times to ensure accurate detection. For example, when two gears 200 in contact, voltage is transmitted to the contact detection subunit 34, which then uses a timer 343 to count and compare the count with a preset duration. For instance, if the timer 343 counts 1, 1.5, 1, 1, 4, 1, then the count corresponding to 4 indicates an abnormal contact of the gear 200, and a specific signal is output to notify the fault detection unit 10. For example, timer 343 can be set to start timing using a high level trigger. However, since the first power supply 33 cannot be set to an excessively high voltage, it needs to be amplified by voltage amplifier 341 before driving the first switching transistor 342 to turn on, thereby starting the second voltage-triggered timer 343. Of course, timing can also start directly based on the amplified voltage-triggered timer 343, which is not limited here. Alternatively, a controller can be used to perform the above operations, which is also not limited here.
[0033] In one embodiment, the fault detection circuit further includes: A wireless transmitter is connected to the second end of timer 343; A wireless receiver, which is connected to the fault detection unit 10, or; Reference Figure 4 , Figure 4 This is a schematic diagram of another scenario of the second embodiment of the fault detection circuit of this application. The third wire 51 is connected to the second end of the timer 343. The coaxial component 52 has its first end slidably connected to the second end of the third wire 51, and its second end is connected to the fault detection unit 10.
[0034] In this embodiment, because the contact detection subunit 34 is mounted on the gear 200, it rotates with the gear 200. Therefore, when a wireless transmitter and receiver are needed for wireless data transmission, the data cable can be prevented from becoming tangled. Alternatively, a coaxial component 52 can be used. For example, the second end of the timer 343 can be connected to a third wire 51, and the second end of the third wire 51 can be slidably connected to the first end of the coaxial component 52. This allows for real-time data acquisition without causing the wire to become tangled. (Refer to...) Figure 4For example, the first end of the coaxial component 52 is a circular conductive groove, which is also connected to the fault detection unit 10 via data transmission. The second end of the third wire 51 is a protrusion, which is located inside the circular conductive groove and rotates synchronously with the gear 200, but is always in contact with the circular conductive groove to transmit data. Therefore, data transmission can be achieved. Of course, all data transmission methods in the above embodiments can use the above method, and will not be described in detail here.
[0035] In one embodiment, based on the first and / or second embodiments of this application described above, a third embodiment of the fault detection circuit of this application is proposed, referring to... Figure 5 , Figure 5 This is a schematic diagram of the framework of the third embodiment of the fault detection circuit of this application. The speed detection unit 40 includes: Speed sensor 41 is set at speed detection position 230 of gear 200. Speed sensor 41 is connected to fault detection unit 10. Speed detection position 230 includes the side of gear 200.
[0036] In this embodiment, the speed detection unit 40 includes a speed sensor 41. Of course, other speed detection instruments can also be used; this embodiment uses the speed sensor 41 as an example. For example, the speed sensor 41 is located at the speed detection position 230 of the gear 200. The gear 200 can be one of multiple gears 200 connected in sequence, or each gear 200 can have a speed sensor 41. When the speed sensor 41 is located at the speed detection position 230 of the gear 200, if a speed signal is detected, it will be transmitted back to the fault detection unit 10. For example, as described in the above embodiment, the speed signal can be a single signal, such as a speed value, or a high / low level signal. This will not be repeated here; this embodiment uses the output of a speed value as an example. In another embodiment, the speed detection unit 40 can also be a spring located at the speed detection position 230 of the gear 200. One side of the spring is connected to a low-voltage source and fixed together with the low-voltage source at the speed detection position 230 of the gear 200. The other side of the spring is connected to the first side of another spring, and the two springs are in contact under normal conditions. The second side of the other spring is connected to the motor output shaft. At this time, the working principle of the entire speed detection unit 40 is that when the speed output by the motor is the same as the speed of the gear 200, the two springs contact each other, and then the voltage of the low voltage source is supplied to the fault detection unit 10 to inform the fault detection unit 10 that the speed is normal at this time. Conversely, when the voltage of the low voltage source cannot be detected, the speed will be determined to be abnormal, and the speed of the gear 200 can be detected to provide a basis for subsequent fault detection.
[0037] In one embodiment, based on the first, second, and / or third embodiments of this application described above, a fourth embodiment of the fault detection circuit of this application is proposed, referring to... Figure 6 , Figure 6 This is a circuit diagram of the fourth embodiment of the fault detection circuit of this application. The fault detection unit 10 includes: Fault detector 11 has its first terminal connected to the speed sensor 41 and the motor controller in the speed detection unit 40. When the motor speed value of the motor controller is greater than the speed of the gear 200 of the speed sensor 41, the third terminal of fault detector 11 outputs a high level. The second terminal of fault detector 11 is connected to the second terminal of the timer 343 in the gear contact unit 30. When the timing value of the timer 343 is not within the preset range, the fourth terminal of fault detector 11 outputs a high level. The bearing detection subunit 13 is connected to the third end of the fault detector 11, the fourth end of the fault detector 11, and the vibration sensor 21 in the vibration detection unit 20. Gear detection subunit 12 is connected to the fourth end of fault detector 11 and vibration sensor 21.
[0038] Furthermore, the gear detection subunit 12 includes: Gear fault indicator D1, the negative terminal of gear fault indicator D1 is grounded; The second switch Q2 has its third terminal connected to the fourth terminal of the fault detector 11, and its first terminal connected to the positive terminal of the gear fault indicator D1. The third switch Q3 has its third terminal connected to the vibration sensor 21, its first terminal connected to the second terminal of the second switch Q2, and its second terminal connected to the power supply VCC.
[0039] In this embodiment, since the acquired signals need to be processed, a fault detector 11 can be set in the fault detection unit 10. The fault detector 11 can be a microcontroller, and a detection program can be set in the microcontroller. This detection program can be a commonly used program for comparing values. For example, the fault detector 11 is used to output a high level at its third terminal when the motor speed value of the motor controller is greater than the speed of the gear 200 of the speed sensor 41, and a low level when the two are equal or within the allowable error range. Of course, the comparison method between the motor speed value of the motor controller and the speed of the gear 200 of the speed sensor 41 can also be the comparison method through a spring connection as described in the above embodiment, which is not limited here. Meanwhile, when the timing value of the timer 343 is not within the preset range, the fourth terminal of the fault detector 11 outputs a high level. For example, the preset range of each contact duration is a-a1. If it is within this range, it is determined that the contact between gears 200 is normal; otherwise, it is determined that the contact between gears 200 is abnormal. For example, if a gear 200 is missing, the contact time will be longer or shorter. Therefore, the fault of gear 200 can be determined based on the contact. The contact signal and speed signal can be processed to obtain the final high and low levels, so as to detect the fault based on the high and low levels.
[0040] In one embodiment, the gear detection subunit 12 includes a gear fault indicator light D1, which illuminates when the gear 200 malfunctions to alert the user. Assuming the fourth terminal of the fault detector 11 is set to output a high level when there is no contact abnormality and the vibration sensor 21 outputs a high level when there is vibration abnormality, the second switch Q2 can be set to a low-level conducting device and the third switch Q3 to a high-level conducting device. This allows for the selection of either an N-type or P-type switch to detect gear 200 faults. For example, assuming the above control logic, when a low level is input to the third terminal of the second switch Q2 (the second switch Q2 is conducting), a contact abnormality is detected. The positive terminal of the gear fault indicator light D1 is then connected to the first terminal of the third switch Q3. If the vibration sensor 21 outputs a high level (i.e., vibration abnormality), the third switch Q3 is turned on, connecting its first and second terminals. This means the positive terminal of the gear fault indicator light D1 is connected to the power supply VCC, illuminating the gear fault indicator light D1 and alerting the user. Of course, if the control signal of either of the two switching transistors is not satisfied, the gear 200 fault will not be detected. Thus, the gear 200 fault detection can be achieved based on contact and vibration.
[0041] In one embodiment, the bearing detection subunit 13 includes: Bearing fault indicator D2, the negative terminal of bearing fault indicator D2 is grounded; The third terminal of the fourth switch Q4 is connected to the third terminal of the fault detector 11, and the first terminal of the fourth switch Q4 is connected to the positive terminal of the bearing fault indicator D2. The fifth switch Q5 has its third terminal connected to the vibration sensor 21, its first terminal connected to the second terminal of the fourth switch Q4, and its second terminal connected to the power supply VCC. The sixth switch Q5 has its third terminal connected to the fourth terminal of the fault detector 11, its first terminal connected to the positive terminal of the bearing fault indicator D2, and its second terminal connected to the negative terminal of the bearing fault indicator D2.
[0042] In this embodiment, the bearing detection subunit 13 includes a bearing fault indicator light D2, which illuminates when a bearing fault occurs to alert the user. Assuming the fourth terminal of the fault detector 11 is set to output a high level when there is no contact abnormality, and the vibration sensor 21 outputs a high level when there is vibration abnormality, and the third terminal of the fault detector 11 is set to output a high level when there is speed abnormality, then the sixth switch Q5 can be set to a low-level conduction device, while the fourth switch Q4 and the fifth switch Q5 can be set to a high-level conduction device. This means that by selecting either N-type or P-type switches, bearing fault detection can be achieved. For example, assuming the above control logic, when a high level is input at the third terminal of the fourth switch Q4 (the fourth switch Q4 is turned on), an abnormal speed is detected. At this time, the positive terminal of the bearing fault indicator D2 is connected to the first terminal of the fifth switch Q5. At this time, it is found that the vibration sensor 21 outputs a high level (i.e., abnormal vibration). Then, the fifth switch Q5 is turned on, that is, the first terminal of the fifth switch Q5 is connected to the second terminal of the fifth switch Q5. In other words, the positive terminal of the bearing fault indicator D2 is connected to the power supply VCC, so that the bearing fault indicator D2 lights up, thereby alerting the user. Furthermore, the bearing detection subunit 13 is also equipped with a sixth switch Q5. The third terminal of the sixth switch Q5 is connected to the fourth terminal of the fault detector 11, the first terminal of the sixth switch Q5 is connected to the positive terminal of the bearing fault indicator D2, and the second terminal of the sixth switch Q5 is connected to the negative terminal of the bearing fault indicator D2. This avoids mistaking speed changes caused by gear 200 faults for bearing faults. Therefore, only when there is no gear 200 fault (i.e., the third terminal of the sixth switch Q5 is low-level, and the sixth switch Q5 is not conducting) will the subsequent bearing fault detection process be executed. Conversely, if an abnormal contact is detected, the sixth switch Q5 will be turned on, i.e., the bearing fault indicator D2 will be short-circuited, thus confirming a gear 200 fault. Of course, if the control signal of either of the two switches is not satisfied, a bearing fault will not be detected. Thus, bearing fault detection can be achieved based on speed, contact, and vibration.
[0043] Based on the above embodiments of the fault detection circuit, a wind turbine generator set is proposed, which includes the aforementioned fault detection circuit.
[0044] In this embodiment, the wind turbine generator set uses a fault detection circuit to determine gear 200 faults based on vibration signals detected by vibration detection unit 20 and contact signals detected by gear contact unit 30, and / or bearing faults based on vibration signals, speed signals detected by speed detection unit 40, and contact signals. This accurately distinguishes between gear 200 faults and / or bearing faults. Furthermore, combining multiple signals ensures accurate detection, avoiding the one-sidedness of relying solely on vibration signals (e.g., the complex transmission chain within the wind turbine generator set can cause interference from vibration signals). Specifically, it determines gear 200 faults based on vibration and contact signals, and / or bearing faults based on vibration, speed, and contact signals, thereby achieving fault detection for both bearings and gear 200 and improving the accuracy of the fault detection circuit. Moreover, the entire fault detection circuit ensures accurate normal operation and allows for timely maintenance by identifying faults, ensuring operational safety.
[0045] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.
Claims
1. A fault detection circuit, characterized by, The fault detection circuit includes: A vibration detection unit is provided, which is located at the vibration detection position of the gear and is used to detect the vibration signal of the gear. A gear contact unit is disposed at the contact detection position of the gear and is used to detect the contact signal of the gear. A speed detection unit is disposed at the speed detection position of the gear, and the speed detection unit is used to detect the speed signal of the gear. A fault detection unit is provided, which is connected to the vibration detection unit, the gear contact unit, and the speed detection unit respectively. The fault detection unit is used to determine gear faults based on the vibration signal and the contact signal and / or determine bearing faults based on the vibration signal, the speed signal, and the contact signal.
2. The fault detection circuit of claim 1, wherein, The vibration detection unit includes: A vibration sensor is disposed at the vibration detection position of the gear and is connected to the fault detection unit. The vibration sensor is configured to output a high level when the vibration frequency is greater than a preset frequency. The vibration detection position includes the side of the gear.
3. The fault detection circuit of claim 1, wherein, The gear includes a primary gear and an auxiliary gear, and the gear contact unit includes: A first wire covers each gear block of the main gear, and a first end of the first wire is connected to a first power source, and a second end of the first wire is grounded, wherein the first power source is disposed on the side of the main gear. The second wire covers each gear block of the auxiliary gear; A contact detection subunit, wherein the first end of the contact detection subunit is connected to the second wire, and the second end of the contact detection subunit is connected to the fault detection unit.
4. The fault detection circuit of claim 3, wherein, The contact detection subunit includes: A voltage amplifier, wherein a first terminal of the voltage amplifier is connected to the second wire; A first switching transistor, the third terminal of which is connected to the second terminal of the voltage amplifier, and the second terminal of which is connected to a second power supply; A timer, the first end of which is connected to the second end of the first switching transistor, and the second end of which is connected to the fault detection unit.
5. The fault detection circuit of claim 4, wherein, The fault detection circuit also includes: A wireless transmitter, wherein the wireless transmitter is connected to the second end of the timer; A wireless receiver, which is connected to the fault detection unit, or; A third wire, the first end of which is connected to the second end of the timer; A coaxial component, wherein the first end of the coaxial component is slidably connected to the second end of the third conductor, and the second end of the coaxial component is connected to the fault detection unit.
6. The fault detection circuit of claim 1, wherein, The speed detection unit includes: A speed sensor is disposed at the speed detection position of the gear and is connected to the fault detection unit, wherein the speed detection position includes the side of the gear.
7. The fault detection circuit of claim 1, wherein, The fault detection unit includes: The fault detector has its first terminal connected to the speed sensor and motor controller in the speed detection unit. When the motor speed value of the motor controller is greater than the gear speed of the speed sensor, the third terminal of the fault detector outputs a high level. The second terminal of the fault detector is connected to the second terminal of the timer in the gear contact unit. When the timing value of the timer is not within a preset range, the fourth terminal of the fault detector outputs a high level. A bearing detection subunit is provided, which is connected to the third end of the fault detector, the fourth end of the fault detector, and the vibration sensor in the vibration detection unit. A gear detection subunit is provided, which is connected to the fourth end of the fault detector and the vibration sensor.
8. The fault detection circuit of claim 7, wherein, The gear detection subunit includes: Gear fault indicator light, the negative terminal of which is grounded; The second switch is connected to the fourth terminal of the fault detector, and the first terminal of the second switch is connected to the positive terminal of the gear fault indicator light. The third switch is connected to the vibration sensor at its third terminal, and the first terminal of the third switch is connected to the second terminal of the second switch. The second terminal of the third switch is connected to the power supply.
9. The fault detection circuit of claim 7, wherein, The bearing detection subunit includes: The bearing fault indicator light has its negative terminal grounded. The fourth switch is connected to the third terminal of the fault detector, and the first terminal of the fourth switch is connected to the positive terminal of the bearing fault indicator light. The fifth switch is connected to the vibration sensor at its third terminal, and to the power supply at its first terminal. The sixth switch is connected to the fourth terminal of the fault detector, the first terminal of the sixth switch is connected to the positive terminal of the bearing fault indicator light, and the second terminal of the sixth switch is connected to the negative terminal of the bearing fault indicator light.
10. A wind power unit, characterized in that The wind turbine generator set includes the fault detection circuit described in any one of claims 1 to 9.