In the same condition, the yaw system can position the nacelle. Turn 360* to prevent excessive cable distortion. 1 Structure and working principle of yaw system The yaw system of HSW-250T wind turbine is electrically driven, and the control system of wind turbine is controlled according to the signal from the wind direction meter. The yaw system includes main components such as a rotating ring, a yaw motor, a speed reducer, and a yaw brake. The rotating ring is a large-scale centripetal thrust single volleyball bearing. The inner and outer rings are fixed by the four-point pre-stressing method to the annular ports of the nacelle and the tower respectively, which provides a rotary connection between the tower and the generator nacelle. . The bearing has a diameter of 1.3m, and the outer ring is machined with teeth that mesh with the yaw spur gear, and is integrated with the deflection brake disc and the tower, and the inner ring is connected with the base of the generator nacelle. Lubrication of the rotating ring is accomplished by 12 isometric lubricating oil nipples mounted around the circumference. The yaw motor and reducer are installed in the generator cabin adjacent to the tower population. The gears on the output shaft of the reducer pass through holes in the base of the generator nacelle and mesh with external teeth on the outer ring of the rotating ring that is connected to the tower under the generator nacelle. The yaw brake consists of two brake calipers and brake discs. The brake caliper is bolted to the base of the generator nacelle, and the brake disc is fixed to the tower. Working principle When the position of the impeller deviates from the wind direction, the wind direction meter sends a signal. After the computer judges the signal, the hydraulic brake caliper is released (the other spring caliper always works, friction damping effect), the yaw motor is started, and the nacelle rotates until The cabin is in line with the wind direction. Yaw adjustment knot 07-03 2 Drive and transmission of the yaw system The directional correction of the generator nacelle is done by the yaw motor through a reduction gear with a gear ratio of 16000:1. The normal motor speed is 1450r/min, the yaw motor is connected to the worm gear transmission, and the transmission ratio is 100:1. The worm gear transmission is mounted on the planetary gearbox with the transmission ratio of 21.8:1, and the pinion gear of the planetary gear box extends. The external tooth engagement on the rotating ring is again decelerated, so that the entire system achieves a gear ratio of 16000:1. In this way, the engine speed of the engine is 0.09r/min. 3 yaw control system 3.1 yaw steering control HSW-250T wind turbine is upwind power generation, in order to ensure that the impeller faces the wind, the system is installed in the generator The wind direction meter on the cabin trailer detects the wind direction, and the electric signal sent by the wind direction meter is input to the system computer to judge. When there is a deviation between the wind direction and the position of the generator cabin, the computer issues a command, and the yaw motor drives the transmission device to perform correction. In order to filter out the effects of short-distance wind direction fluctuations, the wind direction correction is only performed after the correction command is continuously transmitted for 30 s. When the signal of the correction command is no longer communicated, the deflection of the generator nacelle lasts for 7 s and is adjusted by approximately 4°. The safety relay switching time is monitored by the timeout counter. 3.2 yaw limit control Because the rotation of the engine room will cause cable and wire stranding, in order to prevent the cable from being too deformed, the limit of the twisting range is set between *36 (f. If the allowable range is exceeded, the computer will control the yaw system to reverse until The cable strands are completely untied. The HSW-250T generator adopts GF4C type mechanical electric control hydraulic force to automatically change the skin and check Luo Fukun, Yang Fuying (Xuchang Vocational and Technical College, Henan Xuchang 461000) since the 1990s, automatically The transmission (EAT) has almost become the conventional equipment of modern cars. It is light and simple to operate, and does not require frequent shifting. It only needs to automatically control the shift timing according to a certain operating mode. The electronic control unit ECU smoothly transitions according to the preset procedure. The shifting and closing point, the whole system is in the control of flexibility and elasticity, there is no shift shock, and the ride is excellent. However, the structure of EAT is more complicated, and the technical requirements for use and maintenance are relatively slim. 1EAT's structural features EAT consists of a torque converter, planetary gear train, hydraulic and electronic control system, and a housing and oil cooler. The torque converter hydraulic torque converter is composed of a pump wheel, a turbine and a guide wheel, a one-way clutch, a lock-up clutch, an input shaft, an output shaft and the like. The pump wheel passes the hydraulic pressure: 2002-06-24 oil transmits the power to the turbine. The guide wheel and the one-way clutch increase the torsion when the car starts, climbs or low speed, and the lock-up clutch is driven at idle speed. The pump wheel and turbine are directly connected to each other to improve the transmission efficiency of the system. The fault that is easy to occur in this system is that the one-way clutch is damaged or the friction plate of the lock-up clutch is worn, which causes the system oil temperature to be too high and deteriorates early, the power is insufficient, and the idle speed is poor. 2.2 Planetary Gear Planetary gear trains are usually Simpson-style structures, with double-star rows and Samsung rows. For example, the Japanese Toyota series uses the Samsung 4-speed transmission produced by Aisin. It uses 3 clutches, 4 brakes and 3 one-way clutches as shifting actuators, eliminating the need for gear shifting during shifting. The system is prone to failures such as gear shift hysteresis, slippage due to damage to the friction plates of the clutch or brake, or the allowable degree of cable twisting due to the friction material control device. This device is mounted on a rigid mounting plate on the base of the generator nacelle. Installed on a yaw drive reduction gearbox. The transmission part is connected with the reduction gear box, and the movement of the output of the reduction gear box is transmitted to the switch shaft through a certain transmission ratio through the worm, the worm wheel and the gear system. After the shaft rotates through the set angle, the switch is activated to send a signal to start the yaw system. Turn or reverse, untie the strands. 4 Braking device of the yaw system To ensure the correction of the wind direction, the generator nacelle must have the ability to rotate at the top of the tower. In the case of constant wind direction, the nacelle should be in the correct position for accurate positioning. The function of the yaw brake system is to ensure the positioning of the nacelle when stationary, so that the additional load is transmitted from the nacelle to the tower through the brake device; during operation, the yaw gear is protected and the nacelle rotates smoothly. To this end, an annular brake disc with two brake calipers is installed at the interface between the tower and the nacelle. The brake disc is integrated with the tower. The brake calipers are bolted to the 5 yaw yaw system for wind power generation. The main function of the machine is to ensure timely, accurate and safe positioning of the cabin. The yaw system of HSW-250T wind turbine ensures the above functions, and has the following characteristics: The system uses brake calipers to brake, the structure is simple, the brake is reliable, and it is easy to repair. The yaw brake, the rotor brake and the safety brake are all supplied by the same hydraulic power unit, which saves components, reduces leakage, and simplifies the structure of the fan. The deflection ring adopts the external gear, which saves the space inside the tower of the cabin, but the maintenance, lubrication and maintenance of the deflection gear are slightly inconvenient.
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