reciprocal motion of free pistons coincides with that of a displacer piston which is driven by an electric motor, forcing the reciprocal frequency of the power pistons to maintain a constant rated value. In the present design, the frequency is set at 60 Hz. The linear induction generator consists of permanent magnets on the moving power pistons and winding coils on the outer circumference of the cylinder. AC current is induced in the stationary coils by the reciprocal movement of the magnet. This linear induction generator is now designed by Toyota Central Research & Development Laboratories, Inc. The details of the Stirling engine generator are illustrated in Fig. 3.
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