{"title":"A Novel Digital Implementation of AC Voltage Controller for Speed Control of Induction Motor","authors":"Ali M. Eltamaly, A. I. Alolah, R. Hamouda, M. Y. Abdulghany","country":null,"institution":"","volume":30,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":678,"pagesEnd":684,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/13788","abstract":"In this paper a novel, simple and reliable digital firing\r\nscheme has been implemented for speed control of three-phase\r\ninduction motor using ac voltage controller. The system consists of\r\nthree-phase supply connected to the three-phase induction motor via\r\nthree triacs and its control circuit. The ac voltage controller has three\r\nmodes of operation depending on the shape of supply current. The\r\nperformance of the induction motor differs in each mode where the\r\nspeed is directly proportional with firing angle in two modes and\r\ninversely in the third one. So, the control system has to detect the\r\ncurrent mode of operation to choose the correct firing angle of triacs.\r\nThree sensors are used to feed the line currents to control system to\r\ndetect the mode of operation. The control strategy is implemented\r\nusing a low cost Xilinx Spartan-3E field programmable gate array\r\n(FPGA) device. Three PI-controllers are designed on FPGA to\r\ncontrol the system in the three-modes. Simulation of the system is\r\ncarried out using PSIM computer program. The simulation results\r\nshow stable operation for different loading conditions especially in\r\nmode 2\/3. The simulation results have been compared with the\r\nexperimental results from laboratory prototype.","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 30, 2009"}