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Induction motors, which have been widely used in various practical applications, such as fans, pumps, machine tools, vehicle traction motors, etc., are truly the industrial workhorses over the past 120 years. To improve the sensorless induction motor control performance and develop more fault-tolerant motor drives, the paper presents a novel sensorless direct torque control approach based on the proposed...
This study aims to design an adaptive output recurrent cerebellar model articulation controller (AORCMAC), which is embedded into the direct torque control (DTC) system of an induction motor as the speed controller. Similar to the conventional cerebellar model articulation controller (CMAC), the designed AORCMAC also has the advantages of rapid learning, simple architecture, online training, and nonlinear...
The common-mode voltage (CMV) could cause severe hazards to the induction machine winding insulation and bearings, reducing the machine lifetime. This paper proposes an improved predictive torque control (PTC) method with CMV reduction strategy which cost little and much smaller than traditional filter method. A simulation based on SIMULINK is analyzed which verify the effectiveness of the proposed...
In this paper, methods for sizing of PV pumping systems and the simulation of (DTC) Direct Torque Control of induction motor that is used for piloting a water pump supplied by a photovoltaic generator are presented. The sizing of the PV pumping system is based on the calculation of the water needs, the required hydraulic energy and the estimation of available solar power. The best sizing of the PV...
The direct torque control (DTC) strategy is one of the most performance methods for induction machine (IM) drive torque control. The controlled stator magnetic flux and torque cannot be easily measured and therefore must be calculated using an IM mathematical model. This paper examines the impact of the replacement the original voltage IM model by Luenberger observer on the drive performance. As the...
Due to the changed parameters of double sided linear induction motor (DSLIM), the field oriented control (FOC) is not suitable in control and it will result in thrust fluctuation. The thrust control in the DSLIM is a better solution to suppress the thrust fluctuation. This paper establishes the dynamic model of DSLIMs according to the change principle of parameters and uses the model predictive thrust...
The direct matrix converter has been regarded as a promising AC/AC conversion topology and it is being researched. Motor drives are one of the main potential applications of the matrix converter. This paper carries forward the application of matrix converters in AC motor drives using direct torque control (DTC). In the common DTC scheme for the matrix converter, two vectors with the maximum amplitudes...
This paper proposes a simple duty cycle modulated direct torque control (DDTC) for permanent magnet synchronous motors (PMSMs). DDTC sequentially output an active vector and a zero vector during each control period. The duty cycle of active vector is obtained using a duty cycle generator according to the torque error, which can avoid the complex calculation process associated with conventional DDTC...
For the traditional direct torque control of induction motor, the ripple of flux linkage and torque is serious, and the inverter switching frequency is not constant. This paper proposes a deadbeat direct torque control strategy of induction motor. The control algorithm of speed identification based on model reference adaptive system is analyzed. By using back electromotive force as the error vectors...
The paper describes how a Direct Torque Control (DTC) drive technology has been applied to provide improved torque control of a Flying Dividing Shear (FDS) system in a steel rolling mill. The control system has a supervisory level ensured by a Programmable Logic Controller (PLC). The FDS is a highly dynamic, high speed application load and requires a high performance torque control drive for the purpose...
Induction motor is a nonlinear and time-varying dynamics system. In order to improve performance of direct torque control system, a fuzzy neural controller that is not depend on the exact object model is applied. The conventional fuzzy neural control algorithms have double inputs and complex computation, and suffer from high computational burden. A novel fuzzy neural controller with single input,...
This paper present the new technique of calculating the stator flux. The method comprise of new integrator technique by virtue of which the errors which occurs in case of pure integrator can be eliminate. The pure integrator which is already present in the conventional direct torque control method (DTC) have several bugs which can be eliminate by this new integrator design. Offset error occur in conventional...
In this paper direct torque control of asymmetric six-phase induction motor is presented. 5th and 7th order current harmonics are observed in the phase currents if conventional Direct Torque Control (DTC) scheme is extended for asymmetric six phase machine. These harmonic components are not responsible for torque production, thus cause losses in motor winding. Synthetic vectors are used in this paper...
Model predictive torque control (PTC) is simple and effective control method for induction motor drives. The conventional PTC uses all seven vectors, six active and one zero vector, to calculate cost function and improve torque dynamics. But this increases the computational burden on the microprocessor. Also use of zero voltage vector (VV) causes increase in common mode voltage (CMV). In this paper...
This paper presents a new technique to minimize the torque ripples inherited in DTC of induction motor. The typical discrete-based DTC imposes delay time which frequently allows the torque to overshoot beyond hysteresis bands. This triggers the selection of reverse voltage vectors which, in turn, cause large torque decrements. The torque ripples become of great significance at low speeds where torque...
In this paper Direct torque control technique of induction motor is used with different controlling techniques. These techniques are Direct Torque Control with Proportional controller, Proportional Integral controller, Fuzzy Logic controller, Neural Network and Space Vector Modulation. In all the techniques by performing experiments, I have calculated the reading of electromagnetic torque, stator...
Electrical propulsion is gaining popularity in the marine industry, because of its good energy management and better dynamic performance. An azimuth thruster driven by an electric motor is a common configuration found in modern electric propulsion systems. In recent years failures relating to bevel gears and bearings in azimuth thruster drive train failures were reported in the marine industry. The...
This paper proposes a modified predictive direct torque control (PDTC) application specific integrated circuit (ASIC) with a fuzzy controller for eliminating sampling and calculating delay times in a motor drive. A finite delay time not only degrades the control quality but also increases both torque and flux ripples in the motor drive. The proposed PDTC ASIC with a fuzzy controller (fuzzy PDTC) not...
Electric vehicle appears to be one of the valuable solutions for environmental protection and the fast rate of depletion of world fuel oil supply. In particular, due to an increase in the elderly population and aging of a megacity, the need for electric micro mobility is even more apparent. Electric vehicles have serious disadvantages because of the limitation on cruising range imposed by weight,...
A model reference adaptive system (MRAS) based speed estimator for sensorless induction motor (IM) drive is proposed in this paper. The MRAS is formed with flux rotor and the estimated stator current vector. The reference model utilizes measured current vector. On the other hand, the adjustable model uses the estimated stator current vector. The current is estimated through the solution of machine...
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