The traditional vertical axis wind turbine will produce a part of mechanical loss because of the transmission system between the wind wheel and generator, resulting the reduction of the wind energy utilization rate of the wind turbine. This paper proposes a new design method for off-grid small vertical axis wind turbine. The wind wheel is directly connected with the outer rotor of the generator that directly driven by the wind wheel needn't other transmission device, thereby effectively reducing the mechanical loss and the manufacturing cost of the wind generator, improving the utilization rate of the wind energy.

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