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Generator rotor and stator vibration characteristics on stator winding inter-turn short circuit fault are analyzed. Through calculating the generator parameters of air-gap magnetomotive force, air-gap magnetic field energy and magnetic flux density on the fault, the frequency characteristic of imbalance magnetic pull acting on rotor and that of pulsating magnetic pull acting on stator core are found...
An original analytical determination of the force acting on the moving coil in an electromagnetic actuator is presented. The actuator magnetic field is solved analytically using the Schwarz-Christoffel (SC) mapping. The SC integral is solved analytically using the elliptic functions. The results are verified using FEM
In order to predict conducted electro magnetic interference (EMI) in inverter-motor drive system, high frequency (HF) motor models are requested and the involved parameters have to be available. In previous studies, the authors have presented an accurate HF model for induction motors and they have defined the procedures to identify the model parameters. In this paper these results are extended to...
This paper proposed a method for designing a robust controller based on Hinfin control for induction motors with regeneration and field weakening. It is shown how torque and flux decoupling control respect to mismatch of parameter is implemented. The simulation demonstrated robustness of proposed controller
In this research, a piezoelectric polymer film is used to measure the vibrations resulting from torque ripple produced by a switched reluctance machine (SRM). The advantages of the sensor are flexibility in terms of placement and inclusion into existing drive systems, relatively low-cost, and durability. The results of time domain simulation and hardware experiment are shown to validate the use of...
The work analyses the universal motor, developing its transient model, where the parameters are derived from the design data; the model takes into account saturation effects and core losses and allows to analyse the performances and waveforms at the load side (torque, speed) and at the terminals (voltage, current). Since the motor is used in low cost household appliances, the power control is often...
This paper introduces the modeling of the direct torque control (DTC) system of permanent magnet synchronous motor based on Matlab/Simulink. The process of the building simulation system is discussed in detail. Simulation results are presented to help understand the system performance and the influence of PI controller parameters on it. The relationship between torque hysteresis loop's width and torque...
Research into semi-autonomous vehicles for operation in 'convoys' at ultra-short headways leads to a requirement for fast-response electrical drives. The switched reluctance drive possesses a number of attractive features for this application. Techniques for computer modeling of the machine are discussed and data are identified for the modeling process. Using the example of a convoy 'closing up' operation,...
Previous work has shown that it is possible to design surface permanent magnet (SPM) synchronous machines using fractional-slot concentrated windings to achieve wide speed ranges of constant-power operation. A closed-form analytical technique is now available to rapidly analyze candidate SPM machine designs using concentrated windings and tune them to meet the critical condition for optimal flux weakening...
This paper presents a methodology for the optimization of a new type of high speed electrical micromachine for micro scale power generation. The micromachine is integrated into the compressor of a microturbine which operates at 500,000 rpm. Because of the high energy density of fuel, the turbine-generator combination exceeds the limitations of batteries and smoothes the way for high power or long...
This paper presents a winding function-based method to analyze the inter-turn fault in stator windings of a brushless DC (BLDC) motor. It is essential to analyze the behavior of the machine under internal faults and design appropriate protection systems to avoid expensive failures. The winding functions and inductance of stator windings are explained in detail and the informative simulation results...
Detection of faults in cage induction motors based on spectral analysis of line current is a well-known technique in the case of sinusoidal supply. Nevertheless, nowadays there are a huge number of applications for the induction motor fed by frequency converter and, therefore, it is necessary to validate, or even modify, the existing fault detection methods, in order to use reliable and effective...
This paper presents the results of an investigation regarding the thermal behaviour of a three-phase induction motor, when supplied by a reconfigured three-phase voltage source inverter with fault tolerant capabilities. For this purpose, a fault tolerant operating strategy based on the connection of the faulty inverter leg to the DC link middle point was considered. The experimental obtained results...
In this paper, a condition monitoring vector database (CMVDB) approach for broken bar fault diagnostics of squirrel-cage induction machines is presented. In this approach, a database of so-called "condition monitoring vectors" (CMVs) is generated for healthy and broken bar fault conditions using the time-stepping finite-element method. The CMV consists of the negative sequence components...
Feature extraction for fault detection of an induction motor is carried out using the information of stator current. After preprocessing actual data, Fourier and wavelet transforms are applied to detect characteristics under the healthy and various faulted conditions. The most reliable phase current among 3-phase currents is selected by the fuzzy entropy. The fuzzy membership function is also required...
This paper considers the electrical actuation of aircraft wing surfaces, with particular emphasis upon flap systems. It discusses existing electro-hydraulic systems and proposes an electrical alternative, examining the potential system benefits in terms of increased functionality, maintenance and life cycle costs. The paper then progresses to describe a full scale actuation demonstrator of the flap...
Analytical calculus and computational models of multiphysics problems were used in order to solve an overheating problem and simultaneously increasing reactive power in a generator group of a hydroelectric power plant (HPP). All of them present the same geometrical, mechanical and electromagnetic characteristics. A method of iteration using finite elements analysis (FEA) called simplified virtual...
The application of switched reluctance generators for use in direct drive wind turbines is discussed in the paper. A 20 kW prototype machine operating at a rated speed in the region of 100 rpm was designed, built and tested. Experimental results verified the design procedures and also illustrated the suitability of switched reluctance machines for wind energy converters. From full load to load the...
Prognosis for failure of an electric machine can be achieved through the detection of non-catastrophic faults. As the frequency of these types of faults increases, the working life of the machine is decreased, leading to eventual failure. In this work, two types of stator faults are studied. The methods developed are based on analysis of the undecimated discrete wavelet transform of the field oriented...
Switched reluctance motor (SRM) drives have remarkable characteristics, which make them attractive for high-speed applications. In this paper, the basic control strategy for a switched reluctance motor drive circuit is explained. A new power electronic converter is then presented. This topology provides faster rate of rise and fall for the phase current, which permits the motor to operate at higher...
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