Abstract
A gyroscopic power generator produces high output power, but there is a problem that it is a difficult to keep it stable. First, the expression that enables to evaluate the stability margin was obtained from theoretical formula using the assumption of the stable state. The expression meant that if the phase difference decreased, the impedance must be decreased to keep the gyroscopic power generator stable and if the phase difference is large enough, increasing the impedance enables the gyroscopic power generator to produce larger output. Then, it was tested with the simulation. Finally, a gyroscopic power generator was kept stable and producing the maximum output to change external resistances or coils using the phase difference to evaluate the stability margin.