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Electric drives are a key technology for reducing energy consumption of industrial processes, for wind power generation and for enabling electric transportation. It has been observed that almost half of the global electrical energy is consumed by electric motor drives. The university course about modeling and control of electric drives must give the required knowledge to the students hence they are...
This paper presents work that uses field-programmable gate arrays (FPGAs) to accelerate Simulink simulations of electrical machines on a desktop computer by more than 100 times. These simulations operate and can be modified transparently in the Simulink environment with no FPGA expertise required. This offers the prospect of low-cost, highperformance simulation workstations supporting large simulations...
This paper presents the options for determining power losses in the system consisting of indirect frequency converter and induction machine. A mathematical model for calculation of individual losses in machine as well as in converter is presented herein. The model allows the determination of losses both in steady states and in the course of transients, e.g. starting, braking, load change. The model...
The history of faults of induction motors is nearly the same age as the history of induction motors. In the past, induction motors were used in limited places and the faults were solved by taking various measures such as grounding, using over-current protectors, or using voltage-regulators. Nowadays the induction motors are used in a wide area of applications. Therefore the diagnosis and repair of...
The traction converter system of EMU is constructed based on Matlab/Simulink. The system consists of a transformer, a rectifier, an inverter and an induction motor. The rectifier is controlled by the transient current control theory with SPWM technology. In the inverter the indirect vector control theory with current hysteretic band PWM strategy is adopted. Based on the system the traction control...
The article presents thermal analysis of three-phase induction motor using coupled circuit models. The MATLAB/SIMULINK environment and PLECS toolbox were used to create mathematical model of the examined motor. Coefficient of heat transfer through the winding was set experimentally. Results of calculations presented are verified by the measurements on the physical motor.
The conventional direct torque control system in low speed condition has the larger motor torque ripple, that makes the system's low-speed performance poor. To address this problem, we use neural network supervisory controller to replace the original PID controller based on the traditional direct torque control system, and create a system model by the Sim Power Systems of MATLAB software. This system...
Based on the analysis of induction motor dynamic mathematical model and the vector control principle, the construction of the motor control system has been completed. Asynchronous AC induction motor module, the vector controller module, Park transform module, inverter module, module flux, as well as current control, speed-conditioning module have been set up by adopting the idea of modular in Matlab...
The control scheme is presented to aim at the speed control of single phase induction motor. It consists of fuzzy controller, two tracking differentiators, and speed estimator. At first, The design of rotor speed estimator is carried on, which the rotor speed can be obtained according to the general mathematic model of single phase induction motor and rotor estimating speed be used instead of rotor...
For conventional motor soft starter, the starting torque would be seriously decreased when reduce the starting voltage, so it is limited to light load, However, many overloading start-up is required in practical applications. According to the relationship between three-phase asynchronous motor electromagnetic torque and power frequency, when keeping the size of voltage unchanged, the torque can be...
At motor start-up process, the motor speed is constantly changing, the input voltage adjustments should follow the changes of motor speed timely, or it is difficult to achieve the desired objectives, but the traditional way increased the cost of maintaining, complexity, and made the reliability lower, which would certainly affects the usage and scope of the controller. This paper presents a new method...
The previous methods on broken rotor bars fault diagnosis of squirrel cage induction motor (SCIM) were just for motors fed with industry frequency power supply. In this paper, a simulation modeling of SCIM supplied with variable frequency power is introduced, which respectively in normal condition and in broken rotor bars conditions. Through the comparison and analysis of the one-phase stator current...
Models of non-standard induction machines with number of phases higher than 3 are not commonly available and require special effort to implement. This paper presents a model of induction machine with arbitrary number of phases on the stator and rotor, which has been implemented in Matlab-Simulink. It is shown that machines with number of phases higher than 3 have less severe torque pulsation and the...
In order to measure accurately rotor flux, easily and simply estimate rotor speed for induction motor, this paper proposed a rotor flux observer based on a novel voltage model, and an original sensorless control method based on the phase difference between the stator current vector and the stator voltage vector. A novel voltage model was constructed, and then the rotor flux observer was established...
The simulation model of the inverter based on switching function concept is studied and the open faults of switching device in the inverter are considered, the actual implementation of these models under different fault conditions are proposed with the help of MATLAB/SIMULINK. Using mathematical model of the induction motor, the s-function of the motor is written. Only to change the switching function...
Based on fuzzy control strategy, direct torque control (DTC) system of induction motor is designed by making use of a fuzzy controller to choose voltage-space-vectors. Simulation model of this system is realized via Matlab software. Finally, simulation results show that this system has improved dynamic and static performance that the response of torque gets quicker, and the fluctuation of torque turns...
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