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In order to cancel mechanical sensors in the speed controller system of PMSM, a method of rotor position detection speed/position observation based on active control is proposed. It composed active control strategy of observer according to the error between measured current and observed current, then the rotor's speed/position can be calculated with back-EMF which is estimated. Simulation results...
This paper deals with reduced-order observers with stator-resistance adaptation for motion-sensorless permanent-magnet synchronous motor drives. An analytical solution for the stabilizing observer gain and stability conditions for the stator-resistance adaptation are derived. The proposed observer design is experimentally tested using a 2.2-kW motor drive; stable operation at very low speeds under...
A reduced-order position observer with stator-resistance adaptation is applied for motion-sensorless synchronous reluctance motor drives. A general analytical solution for the stabilizing observer gain and stability conditions for the stator-resistance adaptation are given. The local stability of the position and stator-resistance estimation is guaranteed at every operating point except the zero frequency,...
We address the tracking control problem for sensorless (nonsalient-pole surface) permanent magnet synchronous motors with unknown constant load torque. On the basis of stator current and voltage measurements only and without relying on nonrobust open loop integration of motor dynamics, a novel sixth order nonlinear adaptive control algorithm is designed, which guarantees, under persistency of excitation,...
This paper describes a robust full-order adaptive stator flux observer is designed for a speed sensorless DTC system and a new speed-adaptive law and a stator resistance adaptive law are given. Furthermore, dynamic neural network is used to design the observer gain matrix and the gain matrix can be adjusted on-line. The stability of observer is guaranteed by the gain matrix in the whole speed range...
The present paper describes a new flux-weakening (FW) algorithm for speed control of permanent magnet synchronous machine (PMSM) using a sliding mode observer (SMO) for rotor speed and position estimation. In flux weakening techniques needed to applications requiring constant torque and power operation, the produced torque is depended on the negative d-axis stator current applied to waken the magnetic...
The goal of this paper is utilization of the state observer to research a new capability of controlling the axial gap self-bearing motor. Analytical and experimental evaluation for a sensorless speed vector control of a salient axial gap self-bearing motor is presented. The approach is based on the estimation of the extended electromotive force (EEMF) through a Luenberger Observer (LO) with help of...
This paper presents a novel sensorless control system of switched reluctance generator (SRG) in order to reduce cost, simplify system structure and increase reliability. Considering nonlinear characteristics of SRG and robustness of sliding mode observer (SMO), sensorless control method of SRG based on SMO is proposed and analyzed. For wind energy conversion system (WECS), a voltage-source PWM inverter...
In the motion control of the sensorless permanent magnet synchronous motor system, the accurate detection of the rotor position at low or zero speed can improve control precision and enhance reliability. In this paper, a sliding mode observer is proposed based on the high frequency signal injection to estimate rotor position of the sensorless permanent magnet synchronous motor. Simulation results...
This paper presents a sensorless algorithm for the vector control of doubly-fed induction Machine (DFIM) using rotor current based model reference adaptive system (MRAS) observer. The stator flux oriented vector control is employed to achieve variable-speed drive and decoupled active/reactive power control. In the proposed MRAS observer, the reference model is the measured rotor current, which compared...
Controlling electrical drives without mechanical sensors at the machine shaft has several benefits e.g. low cost and high reliability. To avoid these sensors, state observers must be resorted to get the required information using only measured voltages and currents at the machine terminals. In this paper we are considering the problem of estimating mechanical state variables in permanent magnet synchronous...
The major problems of flux-linkage observer based sensorless techniques are drift and offset effects. To solve such problems, a modified rotor flux-linkage observer is firstly proposed to eliminate the drift phenomena. However, the offset occurrence still exists. Therefore, an adaptive offset cancellation technique is sequentially introduced to solve the offset phenomena. In addition, to further improve...
In this paper, sensorless control of induction motor is studied by reducing the adverse effect caused by the variation of the rotor time constant, which is the most effective parameter. For this purpose, a new robust observer for the parameter variation, is designed with the combination of sliding mode approach and Luenberger observer. Then, the observer is used in the rotor flux oriented vector control...
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