Optimization of T-shaped Suspension Magnetic Ring for Vertical Axis Wind Turbine

Aiming at realizing breeze startup, light wind power generation, a novel T-shaped group of passive magnetic bearing (PMB) with three rings high suspension characteristics was proposed to increase the utilization of wind energy and improve the suspension characteristics of passive bearings. The inner magnetic ring of the T-shaped magnetic ring group adopts an oblique 45° polarization method, which can simultaneously balance radial force and axial force with high suspension characteristics. The static characteristics of the T-shaped magnetic ring group are compared with the traditional double rings which dynamic disturbance characteristics were analyzed in three degrees of freedom (DOF) and the parameters are optimized to achieve the optimal suspension characteristics through methods of Taguchi, response surface with mathematical model. The study shows that the capacity of T-shaped magnetic ring group is 2.5 times which can balance axial force and radial force simultaneously with 40% increase in volume than the double ring. The capacity of T-shaped magnetic ring group is increased by 33.6% and the stiffness is increased by 33.7% after optimized, which meets the requirements of suspension characteristics. When the bearing is disturbed in 3 DOF operation, the stable running state of the bearing can still be maintained due to its selfstabilizing system. It provides a reference for the suspension characteristics of the vertical axis wind turbine suspension system.