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This paper presents an experimental study of the RST method applied to control the speed of a Permanent Magnets Synchronous Motor (PMSM) supplied with a vectorial PWM (Pulse Width Modulation) inverter. The RST is used together with a predictive state observer in order to estimate the load torque. The experimental results prove that the presence of this observer allows a better control of the actuator...
In this paper, we investigate position sensorless control technique for the permanent magnet synchronous motor (PMSM). We observed that when the current flows along the magnetic axis, there is variation of the current response caused by the magnetic saturation of the stator core of the PMSM. Based on the variation, we proposed a method of inspecting the PMSM rotor position at the standstill and a...
A novel speed sensorless direct torque control system-SVM-DTC of permanent magnet synchronous motor (PMSM) based on SVM and MRAS is presented. In this paper the various components of the speed sensorless SVM-DTC and the principle of realization are discussed in detail. Finally the simulation results with the application of MATLAB/Simulink show that the speed identification algorithm is accurate and...
There are many torque ripples in traditional direct torque control (DTC) for permanent magnet synchronous motor(PMSM) drive, which are caused by the error of flux linkage estimation and hysteresis band amplitudes, etc.To solve these problems , a radial basis function (RBF) neural networks was designed to estimate the stator flux linkage, and fuzzy controller, in which zero-voltage vector is used,...
This paper introduces a new simple sensorless algorithm of estimating the permanent magnet synchronous motor (PMSM) speed and position. The proposed estimation method is implemented using a stator flux/current and a modified back electromotive force (EMF) observer connected in cascade. The flux/current observer based on sliding mode techniques ensures stator currents convergence while the modified...
System with mechanical speed sensor has lower reliability and higher cost. Traditional direct torque control method has disadvantages of big ripples on current and flux linkage and torque. To solve these problems, the Extended Kalman Filter is established to estimate both stator flux linkage and rotor speed. Therefore, speed sensorless direct torque control for surface permanent magnet synchronous...
With the requirement of energy conservation and environmental protection, current induction motor (IM) with gear box for screw pump is unqualified. This paper investigates a special low-speed, high-torque permanent magnet synchronous motor (PMSM) to directly drive the screw pump without gear box. Design constraints are surveyed for the special PMSM, both from the motor's structure and performance...
The paper presents a fuzzy logic controller (FLC) for permanent magnet synchronous motor (PMSM). The fuzzy logic controller is used for speed control of this type of motors. The dynamic response of (PMSM) with the proposed controller is studied during the starting process and under different load disturbances. The effectiveness of the proposed fuzzy logic controller is compared with that of the conventional...
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