SPRING DRIVE is a mechanical watch, which offers the same level of accuracy as quartz watches. This special feature is realized by a system composed of both mechanical and electrical subsystems. Simulation techniques, which are effective only in one isolated subsystem, have been used to design it. Designers had a demand to take into account the interactions among subsystems to remove the limit in conventional simulations. We have applied a simulation method, based on equivalent circuit technique, to the analysis of the complete system of SPRING DRIVE. The simulation results were in good agreement with measurements. With this validation, the simulation method made a powerful tool in designing and tuning the system as a whole.
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