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To solve the problems of rotor flux field orientation loss and operation performance degradation caused by neglecting iron loss in the conventional vector control system, a new vector control strategy based on iron loss model of induction motor (IM) is proposed in this paper. In this strategy, a slip-type indirect field oriented vector control (IFOC) is designed by setting the magnetizing currents...
Back-EMF self-sensing is commonly used in induction machine (IM) drive systems. Deadbeat-direct torque and flux control (DB-DTFC) has also shown to be a highly effective method for IM control. At low speeds, accurate machine parameters are important for both DB-DTFC and back-EMF self-sensing performance. In this paper, an injection-based real-time parameter estimation method in IM DB-DTFC drives for...
This paper proposes an approach to estimate the ratio between shorted and total turns in interior permanent magnet synchronous machines (IPMSM). When an inter-turn short circuit (ISC) occurs, a particular disturbance affects the motor. The proposed method estimates this disturbance using an observer; this estimated signal is used to obtain the short circuit ratio. The observers are based on a dynamic...
This paper aims to present a model-based design implementation of deadbeat-direct torque and flux control (DB-DTFC) with back-EMF self-sensing for a SPMSM using rapid control prototyping (RCP) in a real-time control environment. Current and flux observers are key technologies for achieving DB-DTFC. However, the implementation of DB-DTFC using RCP tools can lead to an incorrect execution sequence and...
Permanent magnet synchronous machines (PMSMs) have been used in many applications due to their outstanding advantages such as high torque/power density, high efficiency, light weight and good reliability. However the emerging field of electrical traction gave arise to issues which were in general hardly considered in the past Yet, even though well established methods for eDrive control are available,...
In this paper, two approaches to speed estimation, presented in the literature, for a sensorless control of double star induction machine. We will discuss briefly the advantages, disadvantages, and limits of use of these techniques. We will then apply these two sensorless control techniques to the double star induction machine. The simulation results obtained showed that the speed sensorless vector...
A novel four quadrant operation control strategy of permanent magnet synchronous motor (PMSM) drive systems is proposed. In order to regulate precisely output direct current (DC) bus voltage and achieve the control of unity power factor, the exponential functional-based sliding mode reaching law (ESMRL), which adapts to the variations of the grid-side inverter and sliding mode surfaces, is developed...
In order to realize the high dynamic performance of induction motor, a passive speed control scheme of induction motor based on full-order state observer and speed adaptive estimation is proposed for the non-linear nature of the motor. With the analysis of the passive of induction motor and the relationship between passive and stability, a scheme of asymptotic stability torque tracking controller...
This paper mainly studies the angle tracking problem in electronic throttle system with unknown time-varying disturbances. Firstly, generalized proportional integral observer (GPIO) is used to estimate the time-varying disturbances including model uncertainties, friction torque and spring initial torque. Secondly, a composite controller combining disturbance estimation and backstepping control method...
Designing a control system for an induction motor (IM) is a generally twofold task: (1) controller synthesis and, (2) assessment of its stability. When using the full fifth order dq-frame model, with incomplete state information and unknown disturbances, the controller design and the proof of stability are not trivial tasks. In this paper, we propose a speed controller for the IM using a reduced-order...
Precise force detection is required to realize precise force control, and a lot of research have been conducted for precise and robust force estimation. Based on the industrial trends that the number of load-side encoders is increasing in various industrial fields, a force observer using load-side encoder information has already been proposed to avoid the estimation performance deterioration in the...
This paper presents the modelling and simulation of a low-power Brushless DC machine in a Rotor Flux Oriented mode in MATLAB/Simulink. The modelling of the machine is presented in the synchronous dq frame. Using this model suitable Proportional Integral controllers have been designed for the Rotor Flux Oriented speed and current loops. Sensorless simulation estimates obtained from a back-emf observer...
This paper presents an alternative control strategy for 4 degree-of-freedom pose regulation of a quadrotor using the Active Disturbance Rejection approach. The proposed controller was designed using a kind of Lyapunov energy function to ensure asymptotic stability for regulation, in addition to the active disturbance rejection feature which is based in sliding mode extended state observer. This control...
The aim of this work is to control a permanent magnetic axial flux machine with non-sinusoidal back-emf, meant for electric vehicles, by applying a passivity based control strategy. Although, the drive is equipped with Hall Effect sensors, the performance of the system is improved by introducing a linear position observer. The control system consist in a nested current loop, designed using Passivity...
The paper deals with various sensorless techniques for SRM. The theory of most these techniques is described and their advantages and disadvantages are discussed. Simulation of a SRM traction drive for an electric vehicle was created and experimentally verified. A selected method is simulated on the base of a real SRM for various operating range and conditions. The method is analyzed from the point...
It is well-known that in multiphase drives the spatial harmonics of the air-gap magnetic field can be controlled independently of each other. In this paper it is shown how the third-order spatial harmonic of the magnetic field can be used to estimate the rotor speed without the need of a mechanical sensor. Experimental results confirm the feasibility of the developed sensorless speed observer.
This paper presents a scheme for rotor position estimation from standstill to nominal speed for slotless surface mounted permanent magnet synchronous motors, which do not contain structural anisotropy. At standstill and very low speed, the position is estimated by signal injection, while the rotor polarity is identified by a special process based on the estimation of the back electromotive force (back-emf)...
This paper concerns the development of a sensorless controller for synchronous reluctance motors based on finite elements model results. A hybrid solution is used, which includes an adaptive observer for not-zero speed operation and signal injection for standstill. The observer detects the flux linkages components in the two-phase stationary reference frame by the voltage model integration and closed...
The direct torque control (DTC) strategy is one of the most performance methods for induction machine (IM) drive torque control. The controlled stator magnetic flux and torque cannot be easily measured and therefore must be calculated using an IM mathematical model. This paper examines the impact of the replacement the original voltage IM model by Luenberger observer on the drive performance. As the...
This paper aims to design a reduced observer and optimal controller to stabilize an inverted pendulum on a cart. Pendulum moves with the cart in the direction of the circle tracking. We separately design a reduced-order observer and a linear quadratic regulator (LQR), then combine them to be observer-based controller. Simulation results will demonstrate the responses of pendulum angle and cart position...
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