A limit cycling speed control system.
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The concept of a limit cycling control in power supplies and speed control has advanced the application of these broad areas. ON-OFF switching of a thyristor provides a simple and economical method of control and regulation. This switching of the thyristor causes the system to limit cycle. Basic analysis and design of speed control was performed A describing function was developed to model the power-supply and rectifier bridge. Then it was used to predict the frequency and amplitude of the limit-cycle. A digital computer program was used to simulate the system response and to construct the describing function curves. To verify the describing function validity, the limit cycle predictions were compared with the simulated results. Fourier analyses were performed to determine the ripple instability and subharmonic effect of the system output.
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