Closed Loop Real-time Speed Control of Single Phase Induction Motor Using a PC

摘要

This paper deals with real-time closed loop speed control of a single phase 0.75 kW induction motor using a PC. The motor is fed from a variable-frequency, variable-voltage IGBT power inverter and the driver circuits are interfaced with a PC. The latter executes the control program and serves also as a data acquisition system through an ADC/DAC add-on card. The program and time overhead on the PC are minimized by external hardware which digitally generates the PWM signals required by the inverter. The multitasking software in C language using foreground and background programs enables the PC to function interactively with an operator in real time.