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This paper proposes a hybrid control scheme peak current, applied to a single-phase micro inverter with flyback topology coupled to a LC filter, the proposed scheme allows the inverter to operate by boundary conduction mode when the output current exceeds a predetermined value. Otherwise, it operates in the discontinuous conduction mode, limiting the switching frequency. To set the control system...
This paper presents an active cell balancing circuit based on the forward converter with an RCD reset circuit. The proposed cell equalizer uses an RCD reset circuit to prevent the transformer of the proposed active-cell balancing circuit from being saturated. Because of this RCD reset circuit, the stored energy in the magnetizing inductor of a transformer can be released. The proposed cell balancing...
High step-up converters are widely used in sustainable energy systems and recently used in automotive applications due to their high voltage gain capability. Nevertheless, with the purpose of obtaining a higher voltage gain, in comparison with conventional boost converters, current high step-up converters often employ additional multiplier cells, which may lead to significant cost-up and low power...
In order to meet the demands of high efficiency and a wide adaptable range of input voltage, a DualOperation Mode half-bridge LLC converter which can operate in two different modes according to the level of input voltage is obtained by adjusting the driving control strategy of 3-level LLC resonant converter, and the adaptable range of input voltage is doubled with the same parameters of resonant tank...
This paper is aimed at the derivation and the resolution of a new lumped circuit—also called magnetic equivalent circuit (MEC)—based model of claw pole alternators (CPAs). Incorporating the rotor motion, the proposed MEC is intended to the investigation of the time-varying features of CPAs. Furthermore, it considers the saturation and the armature magnetic reaction. For the sake of simplicity, the...
The use of ferrite rings to suppress the Very Fast Transients (VFT) in Gas Insulated Switchgears (GIS) has presented a special application of magnetics where core losses play a positive role [1]. As far as eddy loss is concerned, the simulation work of this application is concerned with the transverse electric (TE) eddy current problem shown in Fig. 1: a magnetic ring with a uniform cross-section...
Flux-switching DC-field (FSDC) machine has the merits of low-cost and flux control ability. Furthermore, this type of machine also possesses the advantage of fault-tolerant capability [1]. However, a few studies have been done on the analyses of fault signatures of this type of machine even though it has two sets of windings [2].
Magnetic field in permanent magnet (PM) synchronous machines is usually analyzed using harmonic modeling (HM) approach [1]. It is a fast and precise tool and therefore is widely used. This modeling technique imposes sources of the magnetic field expressed in terms of current density and magnetization of hard magnetic materials, while the current density corresponds to the armature current. However,...
In this paper the possibility of combining resonant magnetic coupling and resonant electrical coupling is proposed and discussed. Equivalent circuit models are used to demonstrate that efficiency can be improved quite significantly using a hybrid approach. A comparison between resonant magnetic coupling only, resonant electrical coupling only and several hybrid combinations is provided.
For the magnetic flux leakage (MFL) testing technique, the uniform magnetization to the measured specimen will result in smooth signals and reduce the dynamic influence caused by the relative motion between the magnetizing yoke and specimen. In this paper, a magnetic circuit model is established to analyze the effects of yoke parameters on the uniform magnetization. The theoretical analysis is verified...
A free-piston energy converter (FPEC) integrated by a combustion engine and a linear electric machine is suitable for series HEV or other applications stand-alone generators. The transverse-flux machine (TFM) is considered advantageous for such application because of its high specific power and force density [1]. The finite element method (FEM) is widely used in the machine analysis, which is time-consuming...
Electromagnetic actuators are versatile and able to meet demanding requirements, such as operation in very low or very high temperatures. When the actuator is used in a high-temperature environment, we need to know how the force-producing capability of the actuator is influenced by the operating temperature. Previous research works [1-2] fail to show the dependence of the actuator force on the temperature.
When a magnetostrictive actuator (MA) is designed, it is general to use a bias magnetic field for various purposes. One of them is to design a bidirectional MA. It is also expected that the performance of the MA can be fully utilized. The way to impose the bias magnetic field can be classified into the use of a solenoid or a permanent magnet (PM). The PM is preferred to the solenoid due to volume...
This paper deals with the electric characterization of a pulsed field magnetizer for online quality control of permanent magnet rotors. It focuses on the equipment used as well as the equivalent circuit modelling. Therefore, theoretical and measured results will be compared and discussed.
In drive applications with long cable fed electrical machines, inverters and machines need to be protected from high charging currents and overshoot voltages, respectively. This protection is often performed using inverter output chokes with laminated cores to smooth the output current waveform and limit charging currents. As cable and choke reactor form an LC-circuit, they do support oscillations...
This paper highlights a magnetic equivalent circuit model for wound rotor synchronous machine design. The model includes provisions to calculate the performance of machines with an arbitrary number of damper windings in either the q- or d-axis. The computational cost of the model is considered on several modern computing platforms. Its use within design allows for a comprehensive, accurate exploration...
This paper focuses on multi-objective optimization of multi-phase Permanent Magnet Assisted Synchronous Reluctance Motor (PMa-SynRM) using Lumped Parameter Model based Optimizer (LPO). Optimized PMa-SynRM are cost efficient compared to Interior Permanent Magnet Motor (IPM). Five-phase PMa-SynRMs offer lower torque ripple and higher fault tolerant capability. Depending on various industry application...
Harmonic content, magnetic saturation and simulation time can be an issue for the analysis of steady-state and transient behavior of electrical machines. Carrying the simulations with a finite-elements software results in long simulation time. To reduce the simulation time, this paper proposes a fast modelling method based on a coupled circuit whose magnetic couplings are identified with magnetostatic...
This paper presents a virtual rapid analysis model (VRAM) replacing the conventional reduced order systems model for physical value calculation of permanent magnet DC brush motors. The VRAM accomplishes calculations while considering magnetic circuit saturation. Dynamic coil (current, voltage, flux linkage) and motor values (current, voltage, speed and torque) are calculated quickly and with high...
The magnetic circuit of transverse flux reluctance machines causes magnetic flux in three spatial directions. 3-D FEM can be used designing the magnetic circuit, but it requires a relatively long computation time. Therefore 3-D FEM is not useful for an optimization tool. This paper compares four much faster design methods: A simple analytical approach, a magnetic equivalent network, a modified 2-D...
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