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This paper proposes the sensorless control system of induction motor using the observer gain tuning and high frequency injection techniques. The high frequency injection is activated by the condition of observer gain k. The high frequency injection technique is based on magnetic saliencies caused by the saturation and high frequency injection.
The aim of this paper is to present the method of sensorless control of super high speed permanent magnet motor. The extended Kalman filter (EKF) is considered as the speed observer and some aspects of using it (including tuning the covariance matrixes) are presented in the paper. The start-up process as well as the steady state is taken into consideration.
In this paper, a Doubly Fed Induction Machine (DFIM) operating in motor mode and supplied by two Voltage Source Inverters (VSI), in stator and rotor sides, is presented. The aim is to analyze the position sensor fault effects on a Direct Torque Control (DTC) of the DFIM. This justifies the necessity of a reconfiguration control when a position sensor fault appears in order to avoid an interruption...
This paper gives a view about a standardized implementation of a combined INFORM/EMF-model to cover the full speed range of sensorless permanent magnet synchronous motor drives. A special feedback loop returns the output information of the observer to the integrating voltage model. Thus, a stable operation with high robustness against parameter uncertainties and low frequency disturbances is achieved.
The full-order Luenberger flux observer (FOLO) combined with adaptive techniques is the most widely used method for sensorless induction machine (IM) vector controlled drives. However, IM model-based sensorless schemes have an inherently unstable region under regenerating conditions. Additionally, the stator resistance is also required at low speeds, which leads to a complicated multiple-input multiple-output...
This paper proposes a nonlinear sliding mode speed control scheme for interior permanent magnet synchronous motor (IPMSM) drives. The drive uses an adaptive sliding mode observer for rotor speed estimation. Global asymptotic stability of both the controller and observer are guaranteed by Lyapunov stability analysis. Very low speed and standstill performance of the drive is further enhanced by combining...
In this paper a sensorless control method for position control of a radial active magnetic bearing is investigated. This novel bearing concept consists of a three phase design utilized by a three phase voltage source inverter. Additionally the stator coils themselves are used for position sensing by electrical current and voltage signals. Especially statistic properties of position estimation during...
The paper presents the speed sensorless control of the induction motor in the system with the voltage inverter and LC filter. The LC filter is used to smooth the motor currents and voltages. In the control system the non-linear control method is used. For the state variables estimation the disturbance observer is implemented. Because of the voltage drop and phase shift caused by the LC filter the...
This paper proposes a new robust position sensorless control of Interior Permanent Magnet Synchronous Motors(IPMSMs) to inductance variation using the un-known input observer. In position sensorless control of IPMSMs, accurate motor parameters are required for position estimation. However, inductance variation due to magnetic saturation is known to heavily deteriorate performance of sensorless control...
This paper encompasses a comparative study of techniques for position and speed estimation applied to wind energy conversion systems (WECS), connected to a distribution grid by means of a back to back converter. In the context of low and medium power wind energy conversion systems, the robustness of several sensorless techniques are studied taking into account the tolerance of the PMSG parameters.
This contribution deals with design of sliding mode based stator flux observer for direct torque and flux controlled induction machine drives. Proposed flux observer is completed by simple estimation of rotor speed in order to achieve a sensorless drive control. Proper function of presented sensorless control is verified by both simulations and experiments made on designed laboratory prototype of...
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