DC motor has excellent character on speed regulation, such as smooth timing in a wide range, simple method. Meanwhile as its capability on overload, enduring frequent impacting load, it is widely used in area of high performance electric drive such as cutting machine tool, paper machine, etc
This paper researches DC-drive speed system with a dual-converter and dual-closed-loop based DSP, discussing a new control method that combines DSP with D C-drive, designs applies in direct current motor's double closed loop current velocity modulation system. The union control theory's related knowledge as well as the direct-current velocity modulation system's new algorithm, the rotational speed link uses the fuzzy control algorithm, the electric current link uses the digital PI algorithm. Used digital signal processor (DSP) to take system's controller, its processing speed was high, happen to tallied this realizes timeliness to request the high characteristic; in the design of software , calculate the current loop and speed ,and generate trigger signal pulse.