Evaluation of methods of speed estimation of asynchronous motor based on direct torque control (DTC)

In this paper two methods of speed estimation of a three phase induction motor system are analyzed. The method of direct torque control with no sensors was used to control the motor system. The mathematical models of the above mentioned methods are analyzed for every case. Following the estimation method analysis of open and closed loop the observation method of closed loop is expanded with the use of deterministic sets. The simulation on the computer of the whole motor system is carried out based on the mathematic models with Matlab/Simulink software. The results of the simulation bring forward the advantages of the expanded method in nonlinear systems.