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The paper presents a control scheme for the sensorless induction motor that yields the estimates of the fluxes, motor speed and inverse of the rotor time constant. The motor is field-oriented using Direct Field Orientation — the stationary frame fluxes are obtained from a combined Current and Voltage Model Observer. The speed is obtained from a flux-based MRAS sliding mode observer. More importantly,...
The paper discusses two observer designs for estimation of the inverse of the rotor time constant of the induction motor. The paper presents the model and develops a linear and a sliding-mode observer. Estimation is based on the dynamic equation of the flux magnitude in the rotating reference frame. The stationary-frame fluxes are obtained using a voltage model observer — they are used for field orientation...
The paper presents a method to estimate the rotor position, speed and load torque of the PMSM drive. Estimation is based on an extended dynamic model of the PMSM and is done using sequential observers. A first observer estimates the EMFs of the motor; these are used to compute the rotor position angle. The EMFs along with the angle are used as inputs to a second observer which estimates the speed...
The paper presents a method to estimate the inverse of the rotor time constant of the induction motor. The estimation is done using a sliding mode observer under the assumption that the stationary frame fluxes are known. These fluxes are first obtained using a voltage model observer; they are also used for field orientation. With measured voltages, currents, known fluxes and speed, the rotor time...
The paper discusses the problem of estimating the rotor time constant of the induction motor. Estimation is done considering that the stationary frame fluxes are available. The fluxes are obtained using a voltage model observer - the paper assumes that the stator resistance and the magnetizing inductance of the motor are known, therefore, the fluxes are accurate. The inverse of the rotor time constant...
The paper discusses the problem of speed and load torque estimation for the induction motor drive. Estimation is done considering that the motor fluxes in the stationary frame are available - these have been obtained using a Voltage Model Observer. With known fluxes, the paper designs a sliding mode observer that estimates both the speed and load torque. The observer is designed using an extended...
The paper presents a method to estimate the rotor position, speed and load torque of the PMSM drive. The estimation is done using cascaded sliding mode observers (SMOs) and uses an extended dynamic model of the PMSM. A first SMO is constructed based on the current equations of the motor and estimates the EMFs; these are used to calculate the rotor position angle. The EMFs are also fed in a second...
The paper presents a method to estimate the fluxes, speed and rotor time constant of the induction motor (IM) drive. The estimation process is based on the model of the motor in the stationary reference frame. Estimation is done using successive observers that also involve the Model Reference Adaptive System (MRAS) principle. The fluxes are obtained first using a Voltage Model Observer - they are...
This paper presents the design and analysis of a sliding mode observer for the flux magnitude of the induction machine. The design is done using a modified model of the motor in the rotating reference frame. The inputs of the observer are the voltages and currents in the dq frame, and an estimate of the speed (which is not necessarily accurate). Using a speed estimate allows us to eliminate the speed...
The paper presents a speed adaptive observer for the induction motor (IM) drive that can be used in a sensorless implementation. The observer is based on the model of the IM in the stationary reference frame: it uses linear feedback terms to estimate the fluxes and an adaptive law to estimate the speed. The feedback gains are designed using Lyapunov's nonlinear stability method. The investigation...
The paper presents the design of a speed and flux observer for the sensorless induction motor (IM) drive. The design is based on the full-order model of the IM in the stationary reference frame. The proposed method consists of an observer with linear feedback that yields the motor fluxes and also estimates the speed using an adaptive law. Convergence conditions are formulated based on Lyapunov's nonlinear...
The paper presents a speed estimation method for the induction motor (IM) drive. The speed is obtained using the Model Reference Adaptive System (MRAS) principle and is based on a second order sliding mode (SM) observer. First, the stationary frame fluxes of the IM are obtained using a Voltage Model Observer - this is based on the stator equations (which do not depend on speed) and serves as the reference...
The paper presents a method to estimate the speed and rotor position of the permanent magnet synchronous motor (PMSM). Estimation is done using cascaded sliding mode (SM) observers. A front observer estimates the EMFs of the motor in the stationary reference frame; these are obtained by filtering the manifolds of the SM observer. The EMFs are passed to a back SM observer that estimates the speed and...
The paper presents a sensorless sliding mode observer for the flux magnitude of the induction motor (IM) drive. In order to implement a vector control scheme for the IM, the angle of the rotor flux and the flux magnitude are needed. To obtain them, it is typical to use a stationary frame flux observer - once the α, β flux components have been estimated, they are used to compute the flux angle and...
The paper presents a sensorless double-manifold sliding mode observer for the induction motor (EVI) drive. The observer is designed using an alternative state-space model of the EVI — it estimates the speed and the stationary frame fluxes of the motor. These are typically needed in an EVI direct field orientation control scheme. First, the paper presents the alternative state-space model of the IM...
The paper discusses the problem of rotor flux magnitude estimation for the induction motor (IM) drive and presents a state observer that is constructed using the IM model in the synchronous reference frame. Generally, for IM vector control implementation, the magnitude of the rotor flux is required. If flux regulation is intended, the flux magnitude is used in feedback in order to generate the d axis...
The paper discusses the problem of flux estimation for the induction motor (IM) drive and presents a sensorless observer. The objective is to estimate the fluxes of the IM in the stationary reference frame and to obtain the magnitude and the angle of the rotor flux. In a typical sensorless IM scheme, both these estimates are needed. The paper first presents an alternative state-space model of the...
The paper discusses the problem of speed and rotor flux magnitude estimation for the induction motor (IM) drive and presents a sliding mode observer (SMO) that is constructed based on the IM model in the synchronous reference frame. To implement the control scheme of the IM drive, generally, the speed and the flux magnitude are needed. In a control scheme with speed and flux regulation, they are used...
The paper discusses the problem of estimating the speed, the flux magnitude and the rotor flux angle of the induction motor (IM) and presents an estimation method based on two Sliding Mode Observers (SMOs) and the Model Reference Adaptive System (MRAS) technique. The method is based on implementation of two SMOs that both yield the magnitude of the rotor flux; one observer is the reference model,...
The paper discusses the problem of flux estimation for the induction motor (IM) drive and presents a sensorless observer. The intention is to estimate the IM fluxes in the stationary reference frame in order to obtain both the magnitude and the angle of the rotor flux. The flux magnitude is typically used for d axis feedback; the flux angle is needed for field orientation. The paper presents an alternative...
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