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This paper deals with the problem of stator and rotor resistance variation due to prolonged operation in vector controlled induction motor drives. An online adaptation method is developed using Higher Order Sliding mode control principles and Lyapunov Stability theory to simultaneously estimate the stator and rotor resistances online and compensate them in order to achieve the flux orientation and...
This paper describes new controller architecture to enhance an Interior Permanent Magnet Synchronous Motor (IPMSM) drive robust to current sensor failure. In order to increase the reliability which is crucial topic in industrial applications a virtual sensor (nonlinear observer) and a voting algorithm are combined with the actual sensors to create fault tolerant controller. It is assumed that stator...
In this paper a flexible direct torque control (DTC) of a sensorless interior permanent magnet synchronous motor drive is proposed based on variable structure approach and space vector modulation technique. According to this method, a sliding mode plus-PI controller is designed for torque and flux control respectively in stator flux reference frame. Simulation results obtained indicate improved performances...
This paper presents a new sensorless speed and position estimation method for salient-pole Permanent Magnet Synchronous Motor (PMSM) based on a new mathematical model. All the system variables are expressed in a γδ estimated rotating reference frame. The modified back Electromotive Force (EMF) observer estimates the rotor speed and position utilizing the equivalent control signals of a sliding mode...
Induction Motor (IM) speed control is an area of research that has been in prominence for some time now. In this paper, a nonlinear controller is presented for IM drives. The nonlinear controller is designed based on input-output feedback linearization control technique, combined with sliding mode control (SMC) to obtain a robust, fast and precise control of IM speed. The input-output feedback linearization...
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...
In this paper two algorithms for sensorless control of induction machines, linear reduced-order and sliding mode observer will be discussed and compared. The linear reduced-order method is a third order disturbance observer which is very simple to design and execute, while the sliding mode observer is complicated. It will be shown by the simulation results that the estimated speed by the two methods...
This paper propose an adaptive sliding mode observer(SMO) which adds an estimation function for the stator resistance to the conventional sliding mode observer. It is proposed for the robust sensorless control of permanent magnet synchronous motor(PMSM) with variable parameters. The low-pass filter and additional position compensation of the rotor are used to reduce the chattering problem commonly...
This paper implements a new observer model in parallel with a sliding mode concept for a field oriented control drive system. The proposed system accounts for the problem of stator resistance variation. The use of feedback correction on the output of the observer eliminates the effect of stator resistance and makes the new observer robust in terms of motor parameter variation. A comparison between...
An adaptive nonlinear sliding mode controller combined with a field orientation scheme has been developed for the control of induction motor to achieve rotor angular speed and rotor flux amplitude tracking objectives. The inputs to the controller are the reference speed, the reference flux, the measured stator currents, the measured rotor speed, the estimated rotor flux, and estimates of the varying...
A new sensorless method of estimating the permanent magnet synchronous motor speed is presented. The method is based on sliding mode observer theory using Lyapunov stability criteria. The observation algorithm makes use of the machine model equations allowing the estimation of flux/current, stator resistance, rotor angle and rotor speed from the motor terminal measurement of currents and voltages...
This paper presents a novel sensorless discrete sliding-mode (SM) stator flux and torque controller for three-phase Induction motor drive which is supplied by a three level SVM voltage source inverter (VSI). The stator flux is estimated by a sliding-mode observer and is employed in the rotor speed and stator resistance estimation. In the proposed method the motor iron losses is modeled by a rotor...
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