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In this paper a sensorless control scheme is presented for permanent magnet synchronous motors. Position and angular velocity are estimated on the basis of current measurements and voltage input, making use of a super-twisting sliding mode observer. The estimated angular velocity is used to track a reference velocity. The control scheme implements also an observer of the load torque. Simulations show...
Variable-speed drives are being continually innovated. Recently, sensorless induction motor drives have been much studied due to several advantages, and various sensorless algorithms for an induction motor drive have been proposed. Most sensorless control algorithms are based on the flux and speed estimations which are obtained from the voltage equations. Therefore, the sensorless control performance...
A novel simplified stator flux oriented control (SFOC) for three-level inverter-fed induction motor drive is proposed to achieve high performance torque control in both steady state and transient conditions. Sliding mode control (SMC) is designed, in stead of conventional PI controller, to obtain the continuous commanding voltage vectors. The speed accuracy and dynamic tracking performance, as well...
Wind turbine generators (WTGs) are usually equipped with mechanical sensors to measure wind speed and rotor position for system control, monitoring, and protection. The use of mechanical sensors increases the cost and hardware complexity and reduces the reliability of the WTG system. This paper proposes a wind speed and rotor position sensorless control for wind turbines directly driving permanent...
The paper discusses the problem of rotor position estimation for the nonsalient permanent magnet synchronous motor (PMSM) and presents a Sliding Mode (SM) EMF observer that is based on the machine's model in the stationary reference frame. The speed of the PMSM which is an input of the proposed sliding mode observer is obtained from a speed estimator. The paper assumes that the speed estimate is different...
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...
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 proposes a new scheme for mechanical sensorless control of symmetrical six phase induction motor. The motor has two sets of three-phase windings, spatially phase shifted by 60 electrical degrees. This sliding mode observer used, is composed of three other observers: current, flux, and speed observers. The estimated currents in the current observer are used in the flux estimation block,...
The paper presents a comparative study of two different speed observer techniques for a sensorless induction motor drive. Both Model Reference Adaptive System (MRAS) and sliding mode control theories are considered. The speed estimation algorithms based on both techniques are derived and implemented in a simulation program. The robustness of both speed estimation algorithms against load torque changes...
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