Abstract
Due to the advantages of smooth transmission, great transmission torque and low axial force, herringbone gears replace spur gears to construct the planetary gear set of the transmission system of the wind turbine. It is a reality that the variable speed process exists in the transmission system of the variable-speed constant-frequency wind turbine, so in this paper, a dynamic model for herringbone planetary gears is proposed which can be applied in the dynamic analysis of variable speed or large velocity fluctuation process. The planetary gear set is transformed into parallel-axis external and internal herringbone gear pairs in the moving coordinate system to obtain the meshing forces, then the Newton's law in non-inertial coordinate system is utilized to obtain the equations of motion of planetary gears. The dynamic responses of start process of planetary Gears in wind turbine are analyzed and the effect of the profile error excitation on the dynamic response is also investigated.
