Moreover, the gearbox is a complex component of a wind turbine, and as such has the longest downtime, constituting a critical loss 5. The high input torque of the blades engages the largest load at the first PGS 4. Therefore, most wind turbines require a gearbox to increase the rotor speed, and a planetary gear set (PGS) is preferred owing to its high-power density and concentric input and output shafts. However, induction generators produce electricity with adequate power at 1000–2000 rpm. Typically, the blades and rotor are rotated by the wind at a low speed of up to 10–20 rpm, transmitting a large torque.
#Freedom planet torque beta generator#
They comprise rotating blades mounted on a rotor transmitting power to the main shaft, a generator for converting mechanical energy into electrical energy, a gearbox that switches the rotating speed of the main shaft to the rated speed of the generator, and surrounding structures that include the tower and rotor yaw mechanism. Among these, wind energy constitutes the largest proportion of renewable energy sources in the United States 3, and wind turbines are used to effectively convert the kinetic energy of wind into electrical energy. Numerous countries have proposed environmental regulations to replace fossil fuels with environmentally friendly and renewable energy resources 1, 2. Consequently, the possibility of designing single helical-geared planetary gearboxes with flexible pins to take advantages of both helical gears and flexible pins was shown analytically. Therefore, it was verified that a flexible pin applied to a single helical-geared PGS, thus far considered impossible, enhances the durability of WTGBs by improving the load sharing and distribution of a PGS. Additionally, microgeometry optimization was applied to improve the load distribution.
Furthermore, the structure of the proposed flexible pin model was analyzed and verified that no static failure or interference occurred. The mesh load factor decreased from 1.37 to 1.08, whereas the maximum face load factor decreased slightly, moderating the overall safety factor variation. The improved durability was evaluated by calculating the mesh load factor and face load factor for contact stress and comparing these values with those of the original straddle-mounted pin. To guarantee their durability, a flexible pin was designed based on the original straddle-mounted pin for enhanced tooth load sharing and distribution in the planetary gear set (PGS) of a wind turbine gearbox (WTGB). Among their various components, gearboxes constitute the most critical loss owing to their longest downtime. Wind turbines are eco-friendly energy sources that generate electricity from wind power.
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