Speed control of a DC series motor using an integral-cycle controlled single triac

The speed control of a DC series motor using an integral-cycle-controlled triac together with a bridge rectifier is studied. The triac is connected in series with one of the motor AC supply lines. Computer results for the motor dynamic and steady-state performance characteristics are presented. The saturation in the magnetic circuit, the iron losses, the mechanical losses and the variation of the motor self-inductance with the armature current are considered in the digital simulation of the motor model. The validity of the mathematical model is checked experimentally. A microprocessor-aided measuring circuit is used to measure the motor performances.>