A Single Chip Microcomputer Based DC Motor′s Speed Regulating System With All Digital and PLL Control

This paper reports on the application of the phase lock loop (PLL) technique to DC motor′s speed regulating and the realization of a all digital PLL system based on single chip microcomputer. In the system a variable structure was applied, and functions of speed setting, all digital trigger, three loops PI algorithm, M/T method and speed show were realized.