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A gyroscopic power generator which generates high speed rotation of permanent magnets using vibrations of human body in daily life is developed. A prototype generator and its fundamental characteristics based on the analysis of the rotor dynamics are presented. Various ways are tried in order to gain higher output power of the generator. High level potential of the generator and its availability for a mobile phone are verified. However, a gyroscopic power generator is difficult to maintain the rotation. Also, an initial velocity is needed for the rotor because it is a non-linear system. So we developed several ways to activate the rotor by external power automatically. 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