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A model reference adaptive system (MRAS) based speed estimator for sensorless induction motor (IM) drive is proposed in this paper. The MRAS is formed with flux rotor and the estimated stator current vector. The reference model utilizes measured current vector. On the other hand, the adjustable model uses the estimated stator current vector. The current is estimated through the solution of machine...
Controlled synchronous machine drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. The eliminating of the speed sensors requires the estimation of speed from the machine itself. At standstill and low speed only the high frequency signal injection methods (HFSIM's) able to give accurate position estimation. The HFSIM's exploit the machine...
This paper deals with a new approach of robust sensorless speed control intended to the induction motors. The speed estimation is done from the double use of the so-called self-control process (SCP) of the induction machine which characterizes the relationship between the stator, rotor and mechanical frequencies. Hence, in this approach, the output torque-current controller generates the so-called...
In this work, the meshless local Petrov Galerkin MLPG method is applied to electromagnetic field problems. The method is implemented using radial basis functions (RBF) for interpolation of trial functions instead of the traditional moving least square (MLS) interpolations. Once of the main advantages of this method is that essential boundary conditions are satisfied as in FEM which eliminates the...
The element-free Galerkin method (EFGM) is based, as the finite-element method, on an integral formulation. This method, requiring only a set of nodes distributed on the analysis area, employs the moving least squares (MLS) approximation for the construction of the shape functions. The main objective of this work is to determine the effects of some parameters such as the width of influence domain,...
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