Yaw driving rotating speed monitoring device of wind turbine generator

Abstract

The utility model provides a yaw driving rotating speed monitoring device of a wind turbine generator set, which is used for realizing high-precision and low-cost monitoring of yaw driving rotating speed and realizing rapid installation and maintenance of the device. The yaw driving rotating speed monitoring device of the wind turbine generator comprises an electromagnetic brake, a yaw driving motor, a proximity switch support, an inductance type proximity switch and a flange plate provided with a speed measuring hole. A central shaft of the yaw driving motor sequentially penetrates through the electromagnetic brake and the flange plate; a plurality of speed measuring holes are evenly distributed in the flange plate in the circumferential direction of the flange plate. The proximity switch support is fixedly installed on the side, facing the flange plate, of the proximity switch support. The induction end of the inductance type proximity switch is perpendicular to the surface of the flange plate and right faces the rotation track of the speed measurement hole, and a preset detection distance is kept between the induction end of the inductance type proximity switch and the surface of the flange plate.

Description

Technical Field

[0001] This application relates to the field of wind power generation, specifically a yaw drive speed monitoring device for wind turbine generators. Background Technology

[0002] The yaw system of a wind turbine generator set, as a core component, plays a crucial role in enabling the unit to quickly and smoothly engage with the wind and maximize the wind capture efficiency of the rotor. Its control accuracy directly affects the unit's operational safety and power generation performance. However, in existing technologies, the yaw drive motor speed of the yaw system is calculated and monitored based on the nacelle position signal collected by the low-speed end yaw position sensor. This method is susceptible to factors such as transient wind speed and direction changes, inherent sensor inaccuracies, and electrical interference. Consequently, this existing speed monitoring method results in insufficient speed monitoring accuracy and delayed protection response, thus reducing system operating efficiency. It also leads to untimely identification of problems such as yaw system stall, abnormal wear of the braking device, and mechanical component failure, ultimately causing the yaw system protection and control to malfunction, seriously threatening the safe and stable operation of the unit and its power generation efficiency. Furthermore, the yaw position sensor has a complex structure, high cost, and is difficult to maintain.

[0003] Therefore, there is an urgent need to develop a yaw drive speed monitoring solution that combines high-precision speed monitoring capability, simple structure, low cost, and easy maintenance. Utility Model Content

[0004] This application provides a yaw drive speed monitoring device for wind turbines, which enables high-precision and low-cost monitoring of yaw drive speed, and allows for quick installation and maintenance of the device.

[0005] The technical solution of this application is as follows:

[0006] A yaw drive speed monitoring device for a wind turbine includes:

[0007] Electromagnetic brake, yaw drive motor, proximity switch bracket, inductive proximity switch and flange with speed measuring hole;

[0008] The central shaft of the yaw drive motor passes through the electromagnetic brake and the flange in sequence.

[0009] The flange has multiple speed measuring holes evenly distributed along its circumference.

[0010] The inductive proximity switch is fixedly installed on the side of the proximity switch bracket facing the flange;

[0011] The sensing end of the inductive proximity switch is perpendicular to the surface of the flange and directly opposite the rotation trajectory of the speed measuring hole, and maintains a preset detection distance from the surface of the flange.

[0012] Preferably, the proximity switch bracket is fixed to the mounting flange of the electromagnetic brake by fastening bolts.

[0013] Preferably, the yaw drive speed monitoring device for the wind turbine further includes:

[0014] The cooling fan blades are fixedly mounted on the central shaft of the yaw drive motor, located on one axial side of the flange, and between the electromagnetic brake and the flange.

[0015] A preset axial gap is provided between the cooling fan blades and the flange to avoid interfering with the rotation of the flange.

[0016] Preferably, the flange is installed at the tail end of the central shaft of the yaw drive motor, the lower end face of the flange abuts against the shoulder provided at the end of the central shaft, and the upper end face of the flange is axially fixed by a shaft retaining ring installed in the retaining ring groove of the central shaft;

[0017] The yaw drive motor has a keyway on its central shaft, and the flange achieves radial positioning and circumferential constraint through the cooperation of the key and the keyway.

[0018] Preferably, the proximity switch bracket has an oblong hole at the top, and the inductive proximity switch is installed in the oblong hole by an adjusting bolt.

[0019] The beneficial effects of this application are as follows:

[0020] The rotation of the yaw drive motor's central shaft causes the flange to rotate synchronously. Each time the inductive proximity switch passes a speed measuring hole, it generates a pulse. The main control PLC's high-speed counter calculates the yaw drive motor's central shaft speed in real time using the pulse count / time. By directly measuring the speed at the high-speed end of the yaw drive motor, errors caused by backlash and slippage at the low-speed end are eliminated, improving the accuracy of yaw speed monitoring. The entire monitoring device only requires three hardware components: an inductive proximity switch, a proximity switch bracket, and a flange, to calculate the yaw drive motor's central shaft speed, resulting in low overall hardware costs. Furthermore, the inductive proximity switch, proximity switch bracket, and flange are easy to install, disassemble, and maintain. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a yaw drive speed monitoring device for a wind turbine in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure of the central shaft of the yaw drive motor in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of the flange structure in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the proximity switch bracket in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of the inductive proximity switch in the embodiments of this application;

[0026] Figure 6 This is a flowchart of the wind turbine yaw drive motor speed monitoring method in the embodiments of this application;

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Yaw drive motor; 2-Mounting flange of electromagnetic brake; 3-Fasting bolt; 4-Electromagnetic brake; 5-Fan cover; 6-Cooling fan blade; 7-Central shaft; 8-Flat key; 9-Shaft retaining ring; 10-Flange; 11-Proximity switch bracket; 12-Fastener; 13-Inductive proximity switch sensor; 71-Shoulder; 72-Retaining ring groove; 73-Flat keyway; 101-Speed ​​measuring hole; 102-Flat keyway; 111-Oval hole; 112-Mounting hole; 131-Detection surface; 132-Fasting nut; 133-Fasting washer; 134-Terminal. Detailed Implementation

[0029] To facilitate understanding by those skilled in the art, the present utility model patent is further described below with reference to the accompanying drawings. While the description is quite detailed, it should not be construed as limiting the scope of the present utility model patent. Obvious variations and substitutions of the following examples are all within the protection scope of this patent.

[0030] Reference Figures 1-5 This application provides a yaw drive speed monitoring device for a wind turbine, comprising: an electromagnetic brake 4, a yaw drive motor 1, a proximity switch bracket 11, an inductive proximity switch 13, and a flange 10 with a speed measuring hole 101; the central shaft 7 of the yaw drive motor 1 passes through the electromagnetic brake 4 and the flange 10 in sequence; the flange 10 has a plurality of speed measuring holes 101 evenly distributed along its circumference; the inductive proximity switch 13 is fixedly installed on the side of the proximity switch bracket 11 facing the flange 10; the sensing end of the inductive proximity switch 13 is perpendicular to the surface of the flange 10 and faces the rotation trajectory of the speed measuring hole 101, and maintains a preset detection distance from the surface of the flange 10.

[0031] The speed of the yaw drive motor 1 is measured directly at the high-speed end (i.e., the central shaft 7) of the yaw drive motor 1 by means of an inductive proximity switch 13. The flange 10 and the inductive proximity switch 13 are integrated into a speed measuring unit, and the high-frequency speed of the yaw drive motor is accurately monitored through a non-contact testing method.

[0032] The rotation of the central shaft 7 of the yaw drive motor 1 will drive the flange 10 to rotate synchronously. Each time the inductive proximity switch 13 passes through a speed measuring hole 101, it will generate a pulse. The high-speed counter of the main control PLC calculates the motor speed in real time based on the number of pulses / time. By directly measuring the speed at the high-speed end of the yaw drive motor 1, the errors caused by backlash and slippage at the low-speed end are eliminated, and the monitoring accuracy of the yaw speed is improved.

[0033] In this embodiment, the flange 10 is specifically installed at the tail end of the central shaft 7 of the yaw drive motor 1. Its lower end face is fixed to the shoulder 71 at the end of the central shaft 7, and its upper end face is axially positioned by the shaft retaining ring 9 installed in the retaining ring groove 72 of the central shaft 7. At the same time, radial positioning and constraint are achieved by the flat key 8 installed in the flat keyway 73 on the central shaft 7.

[0034] Reference Figure 1 In this embodiment of the application, the yaw drive speed monitoring device for the wind turbine further includes: a cooling fan blade 6, which is fixedly installed on the central shaft 7 of the yaw drive motor 1 and located between the electromagnetic brake 4 and the flange 10; a preset axial distance is provided between the cooling fan blade 6 and the flange 10 to avoid interfering with the rotation of the flange 10.

[0035] The flange 10 maintains a certain distance from the cooling fan blade 6 in the axial direction, so there is no interference during rotation.

[0036] The proximity switch bracket 11 is fixed to the upper end face of the mounting flange of the electromagnetic brake 4 and is connected by fastening bolts 3, and remains stationary during operation.

[0037] In this embodiment, the inductive proximity switch 13 is an inductive proximity switch sensor. The surface of the inductive proximity switch sensor is threaded and is connected to the proximity switch bracket 11 through a matching fastening nut 132 and fastening washer 133. By adjusting the thread, the detection surface 131 of the inductive proximity switch 13 can maintain a specified detection distance with the upper surface of the flange 10.

[0038] The proximity switch bracket 11 is fixed to the flange mounting point of the electromagnetic brake 4, and has a waist-shaped hole 111 on the top. The inductive proximity switch 13 is installed on the upper end face of the proximity switch bracket 11 by fasteners 12. It can be adjusted radially, and gaps are reserved in both the radial and axial directions to ensure no interference with the heat dissipation fan blades 6 and the flange 10.

[0039] The axis of the inductive proximity switch 13 and the evenly distributed holes of the flange 10 can be located on the same pitch circle through the oblong hole 111 on the proximity switch bracket 11. The detection signal of the inductive proximity switch 13 is transmitted to the main control PLC for calculation through the signal cable arranged in the terminal 131.

[0040] The aforementioned device monitors the high-frequency rotational speed at the yaw drive input terminal in real time through non-contact measurement and transmits it to the main control PLC. After receiving the electrical signal transmitted by the inductive proximity switch 13, the main control PLC converts the electrical signal into the rotational speed signal of the yaw drive. The main control module compares the measured rotational speed with the target rotational speed and sets the yaw system control and protection program based on the rotational speed deviation value. After the rotational speed measured by the inductive proximity switch 13 reaches the target rotational speed deviation value of the main control system, the yaw system control and protection program is activated to solve control problems such as stall operation, nacelle reverse drag failure, and nacelle skidding in non-yaw state during yaw.

[0041] Combination Figure 6 This application also provides a method for accurately monitoring yaw drive speed, which is based on the above-mentioned yaw drive speed monitoring device, and the specific steps are as follows:

[0042] Parameter acquisition: The inductive proximity switch 13 acquires the rotational electrical signal of the yaw drive motor in real time and transmits the rotational electrical signal to the main control PLC;

[0043] Data Analysis and Processing: After receiving the rotating electrical signal transmitted by the inductive proximity switch 13, the main control PLC module performs data filtering and then converts the rotating electrical signal into the speed signal of the yaw drive motor according to the preset control algorithm.

[0044] Signal Feedback and Protection Procedure: The inductive proximity switch 13 is powered by the main control system's 24V power supply. The inductive proximity switch 13 continuously monitors the actual speed of the yaw drive and feeds this real-time data back to the main control PLC. The main control PLC compares the measured speed with the target speed and sets the yaw system control and protection program based on the deviation value. Once the speed measured by the proximity switch sensor reaches the deviation value of the main control system's target speed, the yaw system control and protection program is activated. The main control system sends commands to the yaw drive, enabling the yaw drive to quickly identify abnormal yaw drive speeds during yaw system start-up and shutdown phases, during yaw, and during non-yaw nacelle taxiing, achieving rapid and accurate control and protection judgments. This process constitutes a closed-loop control system, ensuring the accuracy of yaw drive speed monitoring.

[0045] This method enables rapid and accurate identification and calculation of yaw drive speed, providing a basis for judgment in the control and protection of wind turbine yaw systems. It significantly improves the response accuracy and fault diagnosis accuracy of the yaw system, and can detect and prevent potential faults. Through real-time data interaction between the proximity switch measuring element and the main control system, it can quickly identify yaw start-up and shutdown, and stall anomalies during yaw, enabling the main control system to quickly execute protection actions. In the non-yaw state of the unit, it can promptly detect nacelle slip and trigger control and protection procedures.

[0046] The yaw drive speed monitoring device in this embodiment achieves non-contact and accurate identification of yaw drive speed through a simple device without changing the original yaw drive structure. It has strong engineering operability and significantly reduced operation and maintenance costs.

[0047] This device overcomes the technical shortcomings of existing yaw position sensors, such as long measurement delay and large data fluctuation. By using the high-frequency rotation speed of the yaw drive as the criterion for calculating and controlling the rotation speed of the yaw system, it effectively improves the operational reliability and safety of the yaw system.

[0048] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0049] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A yaw drive speed monitoring device for a wind turbine generator, characterized in that, include: Electromagnetic brake (4), yaw drive motor (1), proximity switch bracket (11), inductive proximity switch (13) and flange (10) with speed measuring hole (101). The central shaft (7) of the yaw drive motor (1) passes through the electromagnetic brake (4) and the flange (10) in sequence. The flange (10) has multiple speed measuring holes (101) evenly distributed along its circumference. The inductive proximity switch (13) is fixedly installed on the side of the proximity switch bracket (11) facing the flange (10); The sensing end of the inductive proximity switch (13) is perpendicular to the surface of the flange (10) and faces the rotation trajectory of the speed measuring hole (101), and maintains a preset detection distance from the surface of the flange (10).

2. The yaw drive speed monitoring device for wind turbines according to claim 1, characterized in that, The proximity switch bracket (11) is fixed to the mounting flange of the electromagnetic brake (4) by fastening bolts.

3. The yaw drive speed monitoring device for wind turbine units according to claim 1, characterized in that, The yaw drive speed monitoring device for the wind turbine also includes: The cooling fan blade (6) is fixedly mounted on the central shaft (7) of the yaw drive motor (1) and located between the electromagnetic brake (4) and the flange (10); A preset axial gap is provided between the heat dissipation fan blades (6) and the flange (10) to avoid interfering with the rotation of the flange (10).

4. The yaw drive speed monitoring device for wind turbines according to claim 1, characterized in that, The flange (10) is installed at the tail end of the central shaft (7) of the yaw drive motor (1). The lower end face of the flange (10) abuts against the shoulder provided at the end of the central shaft (7). The upper end face of the flange (10) is axially fixed by a shaft retaining ring (9) installed in the retaining ring groove (72) of the central shaft (7). The yaw drive motor (1) has a keyway (73) on its central shaft (7). The flange (10) achieves radial positioning and circumferential constraint through the cooperation of the key (8) and the keyway (73).

5. The yaw drive speed monitoring device for wind turbines according to claim 1, characterized in that, The proximity switch bracket (11) has a waist-shaped hole (111) on the top, and the inductive proximity switch (13) is installed in the waist-shaped hole (111) by adjusting bolts.

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