DSP Speed Control of Single-Phase Induction Motor Using C Programming

Use of a high-speed DSP to provide speed-control of a single-phase induction motor is covered in this paper. DSP programming is performed in C rather than assembly language to illustrate the usefulness of a high-level language in such applications. Use of C programming produces direct-control of DSP hardware while allowing simpler programming than assembly language and reducing development time. Algorithms and system configuration are chosen to limit the complexity, cost and development-time for the system. Previously-programmed C-language inline functions are used to produce open-loop V/F speed-control of the single-phase induction motor or SPIM. Necessary modifications that allow open-loop V/f control of single-phase induction motors are examined. The modified open-loop V/F control for single-phase motors is adjusted experimentally to produce the optimum speed-control of a split-phase SPIM. Experimental results are provided for the entire system so the degree of success for such a control methodology can be evaluated