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In the paper the analysis of the Fault Tolerant Control (FTC) of Induction Motor drive system is presented. The Direct Field Oriented Control was used for analysis the speed sensor faults detection systems based on the simple mathematical relationship with two types of the rotor speed estimators. In the diagnostic systems and in the post faulted conditions the MRASCC and NFO observers were used. Simulation...
In this work is presented predictive speed controller for induction motor. It is proposed to divide the control process into two parts: coarse adjustment and regulation in the area of steady state. This allows to reduce the pulsations in obtained waveforms in steady state.
One way to improve properties of electrical machines is to enrich impregnating epoxy resin with AI2O3 or SÌO2 nano- or micro-particles. This improves thermal conductivity of the insulation and reduces the temperature of a winding. The article reviews present work of scientists in the field of enrichment of the epoxy resins. Particle size influence is investigated and discussed same as usage of coupling...
The paper proposes an experimental methodology for measurement of forces acting on the rotor under special operational conditions. The influence of static eccentricity with different load applied on the rotor is investigated. The paper also describes all necessary motor construction modifications and the procedure of preliminary measuring system calibration.
This paper is focused on the analysis of the geometrical deviation of a variable reluctance (VR) resolver and its impact to the inverter losses for automotive applications. Therefore a VR resolver model is introduced, verified with measurements at a sensor test bench and the additional inverter losses are investigated.
This paper presents a special two-phase transverse flux machine with disc rotor. Because of the noncomplex construction and by using simple 2D flux path and 3D printing methods the manufacturing costs are hold low. A design criterion is proposed for maximizing the torque density in the low speed range. To prove the concept and analyse the potential of this construction a first direct driven prototype...
Direct torque control (DTC), which is one type of PMSM drive system, can realize maximum-torque-per-ampere (MTPA) control and flux-weakening control by yielding an optimum target magnetic flux. In this paper, we propose armature reaction flux control that can achieve flux weakening control for PMSM control systems using DTC. Our proposed control focuses on the equivalence of the reactive power, which...
This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation...
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 proposes Fault Detection, Isolation and Reconfiguration (FDIR) techniques to realize the connection of a DFIM pumped storage system with the grid in the presence of current and speed sensor failures. For the detection method authors use the parity space approach either for current sensor failure or the rotation speed one. The proposed reconfiguration techniques exploit stator flux estimation...
The objective of this paper is to analyze a novel high-speed integrated motor-compressor drive system and investigate the opportunities by using gallium nitride (GaN)-based inverters. The proposed integrated motor-compressor is a combination of electric machine and axial-flow compressor by shaping the rotor pole of the electric machine into airfoils. Hence, the proposed integrated motor-compressor...
A method for sensorless control of induction machines is proposed to estimate the field angle error using continuous excitation signals. Effects, which are present during a misalignment between the real world and model value, are used to estimate the error and correct it. Main flux oriented machine model equations, which take into account the magnetic anisotropies of the machine, are used to show...
This paper presents the modeling and control of a doubly-fed induction generator (DFIG) driven by a wind turbine on a real time digital simulator. Real time digital simulators are widely used in the electric power industry by utilities, equipment manufacturers and research organizations. In this paper, two scenarios are considered, the first with a detailed switching model of the back-to-back Voltage...
The purpose of this paper is to show a new state observer for doubly-fed generator. A proposed z-type observer algorithm based on mathematical model of doubly fed generator with additional variables treated as a disturbances has been used. A nonlinear multiscalar control method has been used to control active and reactive power of the generator. All analyses were verified by simulations and experiments...
Stepping motors are well suited for open-loop positioning tasks at low-power. The rotor position of the machine can simply be controlled by the user. Every time a next pulse is sent by the user, the stepping motor driver excites the correct stator phases to rotate the rotor over a pre-defined discrete angular position. In this way, counting the step command pulses enables open-loop positioning. However,...
The use of converters to feed motors instead of the direct-on-line supply has increased the need to understand the behaviour of the induction machine in different operating points. The additional losses in frequency converter fed machines are caused by the harmonic content of a PWM voltage excitation. This paper investigates closely the harmonic contents of stator supply voltage and current. Most...
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...
The derivation of analytical solutions for the optimal reference currents during Maximum-Torque-per-Current (MTPC; or Maximum-Torque-per-Ampere (MTPA)), Maximum-Torque-per-Voltage (MTPV) and Maximum-Torque-per-Flux (MTPF) operation of anisotropic synchronous machines with non-negligible stator resistance and mutual inductance is presented. The analytical solutions allow for a direct computation of...
An integration of an electric motor and a drive with wide bandgap (WBG) devices possesses numerous attractive features for electrified and decentralized actuation systems. The WBG devices are capable of operating at high junction temperature (>170 °C) with improved efficiency due to fast switching speed and low on-state resistance. It also leads to better performance and higher power density electro-hydrostatic...
The teaching of electrical machines and drives requires a new approach to make them more attractive to students, to address and overcome the limitations of time and resources that are usual in electrical engineering programs. The target of this new approach is that after following the course students should have a consistent knowledge and skills on electric machines and drives that gives them the...
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