Abstract
Mechanical frictional resistance offered by the conventional ball bearings prevent the self starting ability of vertical axis wind turbine at low wind speed regimes. This is overcome with use of passive permanent magnetic bearings. The present study focuses on analysing different arrangements of stacked rings of passive permanent magnetic bearings for a small cross flow vertical axis wind turbine using COMSOL Multiphysics software. Configuration 1 shows the highest value of stiffness and maximum axial force exerted by the outer ring magnet on the inner magnet. Therefore, configuration 1 is chosen for fabrication and implementation in a cross flow VAWT. Rotational speed tests are carried out. The rotational speeds of cross flow VAWT with passive permanent magnetic bearings increased by around 2.36 to 3.28 times the speed of the VAWT with ball bearings. The test results showed that the use of permanent magnetic bearings would lead to a significant improvement in the performance of cross flow VAWT.
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