In this paper, a complete modelling and numerical simulation are given
for a system consisting of a separately-excited dc motor fed from an AC to
DC symetrical angle controlled converter through a Bridge rectifier and a
power MOSFET. This work prcsents a detailed theoretical analysis and
experimental results to improve the power factor via this converter. The
differential equations describing the system behaviour in the different
modes of aperation are given. Both transient and steady-state conditions
are obtained by solving these equations numerically. Moreover, the effect
of control voltage of the converter on the system performance is
investigated. The computed performance is verified experimentally where
close agreement .between the computed and test results is achieved. The
results show that the present modelling and numerical simulation is
accurate and convenient to obtin the speed controller parameters for
closed loop speed control in order to provide specific response