Magnetic cores for inductive wireless power transfer (WPT) have many applications and regularly use E, U, pot, and planar/circular shape coils. The systems for wireless energy transfer are not ...conveniently in the power levels required for some applications, as for the electric vehicle (EV), for instance, and there is a necessity to study different coil geometries to improve its efficiency and decrease its volume and weight. In this article, we presented a new hexagonal-geometry coil design placed in the secondary of a WPT, and the tests demonstrate that a Type-II system compliance requirements (SAE J2954) can be accomplished with greater efficiency and lighter weight compared to the circular coil. Finite element analyses accurately allow predicting the mutual inductance and achieving the optimal coil parameters and an experimental setup allows obtaining a rated power output of 7.7 kW operating at 85 kHz. The experimental testbed comprises a series-series resonance compensation circuit, a spiral coil used as primary, the proposed hexagonal pad for the secondary coil, and an ac-output, half-bridge inverter as a source, achieving a lighter, and efficient system in a realist scenario.
This elaboration offers a dynamic model of an Active Magnetic Bearing (AMB) simulated in ANSYS Maxwell 17.1. This work reports simulation for two distinctive structure of AMBs that utilizations ...single electromagnets and double attraction type electromagnets put in 180 degrees separated from each other. At first, the theoretical model of single coil AMB and double coils AMB has been presented. It also deals with a simulation study of active magnetic bearings utilizing Finite Element Method (FEM) in two-dimensional (2-D) and three-dimensional (3-D) platform. 2-D and 3-D simulation have been compared for single and double coils AMB system. Magnetic properties such as- force, magnetic, flux pattern and flux density are performed and observed utilizing ANSYS Maxwell simulation software. This paper also includes a comparative study of an AMBs system with the variation in the gap between the actuator and the rotor and the effect of variation in inductance, flux, magnetic field and force are detected which is obligatory for hardware execution of an AMB system.
The electromagnetic repulsion mechanism (ERM) is highly consistent with the operation mechanisms of the high-speed switch (HSS) owing to its simple structure and fast response capability. To ...investigate the performance difference between the coil–disk ERM and the coil–coil ERM, the authors adopt the finite element models for simulations with the aid of ANSYS Maxwell software. Then, an HSS prototype based on the mechanism of permanent magnet closing and repulsion force opening is developed to verify the numerical simulations. Simulations and experiments demonstrate that under the same excitation conditions, the coil–disk ERM has shorter inherent open time, while the coil–coil ERM has shorter full stroke time. Moreover, it is shown that the difference between the full stroke times of the two mechanisms gradually decreases with the increasing discharging energy.
In the paper the methodology of MMF calculation in magnetic circuit of induction motor by "ANSYS Maxwell" is considered. The calculation is based on the use of the total current law. The magnetic ...circuit of the induction motor is divided into several sections: stator tooth, rotor tooth, air gap, stator yoke and rotor yoke. Each section of the circuit is analyzed separately. The calculation result obtained using "ANSYS Maxwell" is compared with the results of the classical methodology.
Aim of this study is to investigate the influence of both material and geometrical properties of surface mounted permanent magnets (PM) on cogging torque of a brushless DC motor (BLDC) by means of ...numerical modeling based on finite element method (FEM). To this end, a 2D numerical model of the BLDC motor is built by using the software package Ansys Maxwell. In this study, we analyze the machine properties in no excitation mode (i.e. no stator current is applied) and calculate the distribution of magnetic flux density within the entire motor, the magnetic flux density in the air gap, the cogging torque and the back electromotor force (EMF). Firstly, analysis is performed for four different magnets. It is seen that while cogging torque, back EMF, and magnetic flux density in the air gap for the strongest magnet material have the highest values, the lowest values of these are obtained for the weakest magnet. In the second part of the study, the effect of variation of magnet geometry on the cogging torque, magnetic field density and back EMF of BLDC is examined. Three magnet embrace values are handled in this study. When the magnet embrace increases, the value of the cogging torque reduces. Besides, the maximum values of the back EMF are approximately the same for different magnet embraces, while shapes of the back EMF only change based on the magnet embrace. According to the results, the cogging torque strongly depends on the material and geometrical properties of the magnets.
Wireless power transfer (WPT) offers the advantages of convenience, safety, low-maintenance, high reliability, and strong adaptability to the environment. This study proposes a design method to help ...LCC/S compensation topology achieve zero voltage switching (ZVS), which helps improve the efficiency of the system. The optimisation design of the magnetic coupling structure is conducted first via the finite element simulation software, ANSYS Maxwell. Planar circular coil offers superior comprehensive performance over other structures and is thus utilised in this study, which theoretically analyses the primary characteristics of LCC/S (primary inductor-capacitor-capacitor, secondary series) compensation topology. The study makes an in-depth comparison of two methods for achieving ZVS, adjusting secondary series compensation capacitance, and making a primary T-type network asymmetric. The conclusions of the theoretical analysis indicate that making a primary T-type network asymmetric is the most suitable method for the proposed WPT system. A 400 W prototype was built, and it consistently achieved ZVS operation within the entire load range (5–50 Ω). The highest power transfer efficiency (PTE) achieved by the prototype was 92.9%, and the PTE was consistently above 88% within the entire power range (50–400 W).
In an optical voltage sensor (OVS) based on Pockels effect, there are some inevitable issues in its practical applications, such as vibration effects, aging connections between optical elements, hot ...expansion and cold contraction of the elements, and so on. These issues can cause a deviation between the optical elements, which affects the internal electric field distributions in the electro-optic crystal. In this paper, the electric field of a multi-segmented Pockels OVS is analyzed, and the result shows when the incident angle or the position of the crystal has a small deviation, the integral voltage error is more than 0.2%, which makes it impossible to accurately meet measuring accuracy. In order to improve the electric field distributions, a new method of quartz crystal (QC) stratification is presented and verified by simulation analysis and experiments. The optimized structure constructed by the new method can reduce the electric field integral error caused by optical path deviation from 0.1971% to 0.0498% and errors caused by crystal deviation from 0.2759% to 0.0098%, thus making it easier to meet the requirement of 0.2% accuracy class (IEC 60044-7-1999).
This paper presents a core losses and performance calculation with different type of steel materials in the core design for three-phase induction motor by using "ANSYS Maxwell" program in order to ...identify the core material that provides the most effective performance by iron losses reduction. The coefficients of core losses are calculated from the magnetization curve and core Loss curve based on the on steel material databases. Although the difficult to obtain because of the little of existing information. Results show the capability of the proposed Cobalt steel (Hiperco 50) to achieve the significant losses reduction in comparison to the Electrical Steel NGO–AK Steel’s M-19 and Low Carbon Steel-SAE1020.
Finding cost efficient earthing system design with acceptable level of safety might be quite tedious work. Thus, many earthing system engineers try to find the most suitable design either by ...employing only their best experience or taking advantage of some more complex optimisation programs. Although both approaches might work well under certain circumstances, they might fail either due to counter-intuitiveness of the specific situation or by misunderstanding of the applied optimisation method, its limitations etc. Thus, in this paper, the earthing system design optimisation problem was addressed by analysing optimisation simulation results together with conducted sensitivity analysis. In the paper, a simple double ring earthing system was optimised while using five different optimisation methods. The earthing system was placed in different horizontally stratified soil models and the earthing system was optimised by minimising touch voltages instead of commonly minimised earth potential rise. The earthing system was modelled by Ansys Maxwell software. Apart from using Ansys Maxwell built-in optimisers, the possible solution space has also been mapped by performing sensitivity analysis with changing the earthing system design dimensions and the results of optimisation were compared and validated. It was found out that the Sequential Non-Linear Programming Optimisation technique was quite superior to the other techniques. Additionally, in most cases, the Ansys Maxwell optimiser was able to found optimal solution; however, in some cases, based on the initial conditions, it might get stuck in local minima or the results might be influenced by the solution noise. Additionally, some quite non intuitive dependencies of earthing system electrodes positions had been found when different spatial dimensions constraints are used.
Adopting the connection group structure of Dd0yn11, this paper designs a novel low-voltage (LV) distribution transformer (DT) based on inductive filtering (IF), and verifies the proposed transformer ...through a comprehensive innovation experiment. Firstly, the functional relationship between valve-side harmonic current and grid-side current was derived according to the winding model, and the filtering features were obtained to compute the impedance between the valve- and grid-side windings. Next, the design calculation was carried out by the engineering magnetic circuit (EMC) method. After that, a three-dimensional (3D) model was established for the proposed transformer on ANSYS Maxwell. The simulation results show that the proposed transformer meets the design requirements on the relevant parameters, and eliminates the harmonic pollution in the grid. Finally, the proposed transformer was proved correct and effective through experiments, and found to stimulate students' interest in learning and innovation.
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