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The paper deals with the vector control of two surface-mounted permanent-magnet (PM) synchronous-motors in configuration “single-inverter dual-motor”, operating also with unbalanced loads. Since this structure is justified by the objective of obtaining low cost drives, a low computation burden sensorless method is proposed in order to further reduce the system complexity. A very simple algorithm for...
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...
This paper presents a sensorless starting procedure for a soft starter driven IE4 direct on line permanent magnet synchronous motor (PMSM). First, the initial position of the rotor is determined using a pulsating current space vector. Subsequently, the motor is started from standstill by the soft starter from a known position. The following firing sequences are calculated on the basis of the flux...
This paper introduces an innovative sensorless model predictive current control (MPCC) technique for an induction motor (IM) drive. The proposed technique handles the state of the inverter as a discrete control variable in contrast to the classic vector control in which the discrete model of the inverter is not considered. An effective formulation of cost function is used, in which there is no need...
In this paper the induction motor state estimator based on current MRAS-type concept with a modified speed adaptation algorithm is presented. Its stability in motoring and regenerating modes is analysed. The influence of motor parameter mismatch to the stability boundaries is presented. It is shown that one of the proposed modification methods of the adaptation algorithm makes the estimator stable...
Sensorless control of Electric Drives is quite relevant according to the SciVal system data. Indirect determination of the rotor angular position in pulse-vector control systems with wound rotor induction motor (PVCS with WR IM) provides opportunity to enlarge application of these systems. Lack of appropriate mathematical description of electromagnetic processes in schemes with non-traditional windings...
This paper proposes a novel observer for induction motor speed servo systems by utilizing full-order sliding-mode control. A full-order terminal sliding-mode manifold is designed for the observer, and the related control laws guarantee the strong robustness of the observer to internal parameter variations and external disturbances. The chattering and singular phenomenon existed in conventional sliding-mode...
Induction motor is utilized in wide area of electric drive applications. If sophisticated control of speed or torque is required, the actual rotor angular velocity must be known at every time instant. To obtain the speed information, an optical sensor is usually utilized. However, the usage of such sensor brings some undesired effects. The paper compares two very often used methods on a specific induction...
The method of self-identification of permanent magnet synchronous motor inductances for efficient sensorless control has been proposed. The application of developed method allows us to improve the efficiency of motor. The method is based on automatic measurement of motor current time derivative for two positions of rotor. The algorithm of inductance estimation, which uses the obtained measurement...
This paper provides an overview of the progress in sensorless permanent magnet synchronous machine (PMSM) control techniques in Japan. In the first stage, the techniques extracted rotor position information by back-EMF zero-crossing detection techniques. Since around 2000, model-based position-sensorless control techniques have been evolved and are widely used in home appliances as well as general...
In this paper, a novel hybrid model rotor flux observer based on the second order butterworth high-pass filter is proposed. Firstly, for the traditional current model flux observer, two improvements are made to eliminate the cross coupling items. Then, by introducing a PI feedback correction link, it can adjust the coupling of traditional voltage model and current model, so the current model plays...
The paper presents a sensorless disturbance detection procedure that was done on a five phase induction motor with third harmonic injection. A test bench was developed where a three phase machine serves as disturbance generator of different frequencies. The control of the machines is based on multi scalar variables that ensures an independent control of the motor EMF and the rotor flux. For disturbance...
In this paper, a sensorless output feedback controller is designed and developed for the Induction Motor (IM), without using of flux and speed sensors. Firstly, a new sliding mode observer that uses only the measured stator currents is synthesized to estimate the speed, the flux and the load torque. Secondly, a backstepping control is developed so as to steer the estimated speed and flux magnitude...
The current gradient sensorless method is a position detection technique for switched reluctance drives. The method is adaptable and easy to operate. However, this method must filter the current, that causes the phases-lag and notable error in position detection, especially when the rotor runs at high speed. This paper presents an approach that first calculates the phase-lag angle of the low-pass...
This paper introduces an efficient modular solution kit for intralogistic drives, which reduces the total energy consumption of all drives in an automated warehouse by more than 15%. The reduction of energy consumption results from the interaction of optimized components (motors, control techniques and regeneration units), which are described in detail in this paper. Different motor concepts like...
This paper proposed the new control method of the sensorless dual parallel Induction motor drive system which can maintained the steady speed under unbalanced load condition. This method uses new modified observer design technique for mono inverter dual drive system of same parameters and ratings connected in parallel. The simulation work has been reported for different step changes in speed for balanced...
A novel design of a nonlinear full-order observer for sensorless vector controlled induction motors is proposed in this paper. It is known that the speed-sensorless vector control drive system of induction motors does not perform satisfactorily at the low speed, which is caused by the voltage model and its emf calculation of motors. The nonlinear full-order observer system abandons the voltage model...
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 use of a higher order sliding mode scheme for sensorless control of induction motors (IM). The sliding mode approach is used both for control and for generating the rotor speed and the rotor flux estimates necessary for the controller, based only on the measurements of stator voltages and currents. The second order sliding mode control (SOSMC) is based on a super-twisting algorithm...
Model predictive control (MPC) strategy is a typical optimization predictive control method. MPC can achieve satisfying control performance with lower model parameter dependency, and it has been widely applied in process control systems. To improve the system reliability and reduce the hardware cost, extended Kalman filter (EKF) was introduced to achieve sensorless operation. A novel speed sensorless...
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