Microprocessor Speed Control of Electrical Motors Using 3-Phase Semiconductor Converter

Abstract

Speed control of electrical motors is a common need in various industrial processes. DC motors are advantageous as variable speed drives for such applications. The conventional analog control and measuring devices used for speed control of de motor drives, are now widely replaced by digital components. Speed control of de motor by varying the annature voltage using tluee phase controllable rectifier gives precise, simple and cheap control metl10d. This thesis presents analytical and experimental studies for a microprocessor based speed control of de motor fed from semi converter supply during both transient and steady state condition. Also, this thesis presents experimental studies for a microprocessor based speed control of AC motor fed from 3-phase variable voltage variable frequency inverter. Tl1is inverter has two modes of operation , The fl.fst for normal speed and the second for decleration. The squirrel cage 1M is chosen for tl1is application.