Computer simulation and mathematical modelling of static rotor resistance chopper control of WRIM by reference frame theory

Abstract

A detailed analysis and software engineering applied to the static rotor resistance-capacitor drive system under steady state and dynamic conditions are presented. The nonlinear differential equations that describe the system in synchronously rotating reference frame theory are solved by using MATLAB software package. The mathematical state space model utilizing the representation of the machine in synchronously rotating reference frame, where by the direct and quadrature axes are rotating at synchronous speed are presented. The digital simulation results obtained for the torque-speed characteristic of this speed control system is essentially linear for a particular duty cycle. The solution sequence is controlled by a series of conditional statement direct the solution to take into account the type of load characteristics chosen and also the various operational changes, with the effect of duty cycle of the performance of the motor. A WRIM with static rotor-capacitor drive system with constant air gap flux, the electromagnetic torque is directly proportional to rotor rectified current. This control scheme has many advantages, such as smooth and step less control, fast response, less maintenance, longer life and compact size of overall system.