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In order to improve the efficiency, we should know the loss characteristics of inverter-fed induction motors. We first have to accurately measure the total motor losses, and then obtain each loss component by reasonably separate the total motor losses. In this paper, the total losses of a 5.5 kW, a 22 kW, a 30 kW, a 37 kW, a 45 kW and a 55 kW induction motors under sinusoidal supply and PWM inverter...
This paper presents the use of a novel method dealing with mathematical morphology to de-noise spectral contents. This approach is based on two fundamental operators which are dilation and erosion. This type of filter does not need a huge computing time because the operations involved are simple. The goal of this filter in the application considered in this paper is to de-noise the spectrum of the...
On the basis of establishing mathematical model of induction machine, the simplifying assumption of two-dimensional plane finite element model was proposed, and Dirichlet and main boundary conditions were defined. The speed governing of induction machine was realized using back-to-back voltage-fed frequency converter. The continuous output direct voltage value of three-phase non-controlled rectifier...
One of the most popular and easy to implement control strategy for the inverter in induction motor drive system is the hysteresis current control. The most drawbacks associated with the conventional hysteresis current controller is the variable switching frequency due to the constant hysteresis band. This paper aims to develop variable hysteresis band with fuzzy logic controller which can produce...
The paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback...
The paper describes the voltage control technique of squire-cage induction machines supplied by a current source inverter. The control system is based on new transformation of the electric drive system (machine and inverter) state variables to the multi-scalar variables form. The backstepping approach is used to obtain the feedback control law. The control system contains the structure of the observer...
In this paper, a drive scheme generating 24-sided polygonal voltage space vector structure using an inverter topology with single DC source is proposed. A 24-sided structure eliminates dominant low order phase voltage harmonics including and up to seventeenth and nineteenth orders throughout the speed range including step operation. The power circuit has a two-level inverter and two low voltage cascaded...
This paper analyzes the dynamic performance of FOC induction machines operating under current and voltage constraints. FOC rely on the proper performance of the inner current control loops. The capability of the machine to increase its torque can be seriously compromised due to the inverter voltage and current limits, which affect to the current regulator transient response. This can be especially...
This paper presents speed control studies of induction motor by 6-switched 3-level inverter. In topology, the field oriented control technique used which is widely used in the literature, easy and stable for operating systems. The field weakening technique done for exceed speeds to nominal speed to reduce magnetic saturation and thermal losses. End of the process, it has been observed to increase...
Energy saving is arguably the most important factor in issues regarding energy and carbon emission. For electric vehicles in particular, saving energy extends the driving range. This can be achieved with a highly efficient variable-speed drive that can cover a wide speed range, and changing the number of poles is one way of realizing such a drive. In addition, electric vehicles must be fault tolerant...
This paper discusses the main circuit topology and control method of current source controller(CSC) for a three-phase induction motor. In the circuit, the three phase AC power supply is taken as the input part of CSC, which is rectified into three phase controlled rectifier. In DC circuit, the DC bus inductor is utilized to store energy and filters harmonic so that the circuit is shown as the current...
Induction motor speed control was relatively difficult, because the generated torque and flux are related or not free. In addition to adjusting the speed, it required inverter control. The inverter output was not a pure sinusoidal signal but it is the result of the switching. Therefore, it was necessary to be able to fix the method of switching the inverter output signal that can adjust induction...
Electric drives of high power applications require power electronic converters of high power rating. To meet this requirement, the multilevel inverter concept has been introduced for medium voltage and high power applications. The multilevel inverter became popular because of its advantages like low harmonic distortion, less rate of change of voltage (dv/dt) and it reduces the bearings stress of a...
A stator-flux-oriented vector controller of induction motor is often used in the controllers due to less depending on parameters of the motors, the parameters of the motors are nonlinear and time-varying solution conditions slip control will be applied by the brilliant advantages of stability control is slipping sustainable and as soon as the system noise. On the other hand, when the parameters of...
This paper proposes novel and simple method of fault-tolerant control of induction motor supplied by a two-level voltage source inverter. The inverter, after the open transistor fault, is reconfigured — the faulted phase is connected to the neutral point of DC link capacitors. The control method is based on sliding mode concept and allows to obtain robust control of motor torque. It does not require...
The paper deals with the design of an electric locomotive drive system used in electric railway transportation. The drive system consists of an induction motor and a voltage source inverter. A dedicated induction motor design algorithm is developed, in order to improve the motor efficiency. The design of the induction motor was realized with MathCAD and validated with Matlab Simulink. In the second...
The paper considers an electric drive with induction motor and semiconductor frequency converter. The structure of the frequency converter, which includes a three-phase bridge inverter based on fully controlled transistors, is considered. The algorithm of pulse width modulation, used at the majority of electric drives, is discussed. The characteristics and shortcomings of the algorithm are shown....
In this paper, we focus on an evaluation of iron losses of an electric motor under a wide range of ambient temperatures. We experimentally and numerically examine the inverter- and sinusoidal-fed core losses of an induction motor core. The core losses under sinusoidal and inverter excitations decrease with increasing temperatures. In addition, we discuss the building factor (BF) of teeth part of the...
This paper work addresses the enhancement of this technique by associating it the polar coordinates as a proposed tool for a better detection and location of the faulty inverter switch. The proposed use of the polar coordinates tool not only allows the exact computation of both the magnitude and the phase angle values of the fault current vector allied to the faulty inverter IGBT but also enables...
Power electronics and electrical machines nowadays offer an extremely wide range of industrial applications. Their modeling and simulation are also a great interest to engineers and scientists. In some simulation applications, nonlinear of the power electronic devices is neglected due to its simplicity. Therefore, the performance of the control system obtained is not the same as experimental results...
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