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This paper deals with the effect of laminations on natural frequencies of asynchronous machine magnetic core. Measurement of natural frequency of stator core is presented. Numerical model and calculation of natural frequency of core is described in next part. Comparison of measurement and mathematical model is discussed.
The paper presents synthesis and comparison of several drivers of original topologies for LED dimming. The work is based on the hypothesis that the direct current control, in contrast to indirect voltage control, is very useful in LED applications where luminous flux is almost proportional to LED's current. In order to confirm or disprove this hypothesis, several current fed LED ballasts have been...
This paper presents an iron loss calculation by incorporating the Landau-Lifshitz-Gilbert (LLG) equation into a magnetic circuit model. In the proposed model, dc hysteresis loss is calculated by the LLG equation, and eddy current loss is calculated by a magnetic inductance. The validity is proved by comparing with the catalog values.
This paper presents a cell-level simulation model of photovoltaic (PV) systems that is capable of reproducing partial-shading and other mismatch effects at high granularity. The nonlinear diode voltage-current characteristic is stored in a piecewise-linear model, and the stored values are employed to compute the Jacobian matrices very efficiently. As a result, the model can be solved with low computational...
An industrial energy saver system for transportation networks is designed using analytical models and simulation. This off-board energy saver uses the high power capabilities of supercapacitors and an innovative soft switching topology with a nanocrystalline insulation transformer. A laboratory demonstrator is presented, life expectancy of the storage unit is estimated. Field measurements on the industrial...
An analysis technique for electromagnetic compatibility with recovery-diode model is proposed. The accuracy of the recovery-diode model is evaluated by comparison with measurement. Electromagnetic noise caused by the reverse recovery of the diode was predicted by the model, and countermeasures were implemented on the basis of the model's predictions.
Toward the aim of advanced integration in power electronic, the properties of Multicell interleaved converters are of prime interest. Among these properties, the EMC behavior is interesting and the dynamic performances are excellent. However their implementation requires the monitoring and balancing of intercell currents. On one hand, the converter control must ensure a satisfying balanced distribution...
This paper deals with the control of a haptic device which is used in a generator mode to produce electricity from a user's walking movements in a handheld device, like a mobile phone for instance. We first present the design principle of such a device. Then, a design is presented, which allows haptic feedback and energy harvesting to be produced with a same device. It is based on a piezoelectric...
The paper deals with the fundamental research for the design of an electric drive system for a sailplane in cooperation with the oldest and one of the largest sailplane manufactures Alexander Schleicher1. The realizability of this purpose is checked by a system perspective of the electric drive system. Different approaches are considered, e.g. a system with a gear, a downsized motor or an air drag...
A novel coreless technology based on an existing process, initially designed to produce integrated passive components for commercial temperatures, is used and its capability at 200°C is tested. Design aspects and electrical characterizations of the samples are presented. Finally, an endurance test shows a satisfactory behaviour at high temperatures.
The use of active magnetic bearings (AMB) is increasing in high-speed applications, because their low friction operation allows higher rotational speeds than the traditional bearings. The inherent instability and complexity of the AMB rotor system with high nonlinearities pose challenges to the controller design. This leads to a problem of robust design. Robustness of LQG and loop-shaping H∞ controllers...
This paper deals with a comparative evaluation of the single-phase “VIENNA I” and the “DBE” rectifiers. Their cores respectively involve one and two coils. They operate in continuous current and PFC modes thanks to an AC side current control. The two coils allow to get a “Double Boost Effect” during each half-period of the mains, then transmitting the stored energy to both DC capacitors. This is not...
In many cases of new actuation of compliant controlled or bio-inspired joint driven robot, a global identification of electrical and mechanical coupled dynamics is required. This paper proposes a technique which mixes a closed loop output error method with the inverse dynamic identification model method which allows using linear least-squares technique to estimate the parameters. A first approach...
Model predictive control (MPC) is a newly developed control algorithm which can realize the optimal by the state predict and optimal control with lest control errors and smallest control cost. MPC is widely applied in process control systems. In this paper, the MPC algorithm is realized in motor control system instead of the traditional PI regulators. The proposed MPC controller is generic and can...
A high performance controller with effective voltage balance regulation is proposed for a cascade STATtic synchronous COMpensator(STATCOM) with star configuration. Zero-sequence voltages are injected to the output voltages of STATCOM in order to compensate the unblanced load currents, which can also decouple the star-connected three-phase STATCOM system into three single-phase systems. Additionally,...
The series architecture of a Hybrid Electric Locomotive (HEL) using the Energetic Macroscopic Representation (EMR) is suggested in this paper. Indeed, the EMR organizes systems as interconnected sub-systems, improving modularity and flexibility. Firstly, primary and secondary sources' dynamical models are developed using the EMR. Batteries, Ultra-Capacitors (UCs), rheostat, diesel driven generator...
Removing the fault current in DC circuits is comparably difficult since the DC current has non zero-crossing point like in AC current [1,2]. Thus, developing dedicated DC circuit breakers is necessary to get safety for human body and electrical facilities [3,4]. This paper proposed a novel DC circuit breaker against inductive loads. The performance of the proposed DC circuit breaker was verified by...
In this study, an active wideband electric interface based on pulse width modulation (PWM) for piezoelectric energy harvester is investigated. The switching interfaces are used to increase the output power of energy harvesting devices for wide frequency range. The model of a piezoelectric dynamic system is built, and the active interface is developed. It is shown that the active energy harvesting...
Debugging a digital controller for power converters can be a lengthy process due to the long time required in mixed-signal simulations. This paper focuses on the design of a power converter model for debugging digital controllers in closed loop. The testing may be performed by means of simulation or emulation. This paper shows the results of simulating and emulating the power converter using different...
This paper introduces a novel power management architecture for battery powered portable applications, where ac-dc power adapters are used to charge the battery. The flyback-based system allows independent regulation of output bus voltage, irrespective of adapter output, and battery cell voltages. This architecture creates the flexibility to use a wide range of adapters to power the device while charging...
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