Abstract:
In this thesis a microprocessor based speed control system for a dc motor drive is designed and implemented. The motor is fed by a three-phase fully-controlled bridge the delay angle of which is set directly by the microcomputer. The approach used is entirely digital and the system is centered around a Z-80 microprocessor. A digital PI (Proportional-Integral) algorithm implemented in the microcomputer acts on the error to result in the digital control voltage to drive the bridge. An inverse cosine look-up table is used to linearize the bridge characteristics. The stability and dynamic behaviour of the systen is analysed in Z-domain and the experimental investigations are given.
