Multifidelity Sampling for Fast Bayesian Shape Estimation With Tactile Exploration (original) (raw)
Related papers
E3S Web of Conferences
We built a numerical tool allowing the evaluation of self-inductance of arbitrarily shaped coils with few windings. This tool named Inductan aims to be relevant, reliable and reasonably fast in order to be integrated in a more complex model. It is based on a formulation involving the vector potential and the Biot & Savart equation. The general equation giving the self-inductance coefficient is simplified according to the hypothesis of the envisaged geometry allowing to transform a 3d integral in a curvilinear integral operating on just one dimension of space. The numerical implementation is presented as exhaustively as possible, with its particular issues linked to the discrete representation of the coil. The tool is validated first on canonical geometry for which it exists an analytical formulation and second with direct experimental measurements obtained on laboratory coils with controlled and known, but not canonical, shapes.
Mutual Inductance Calculation Between Misalignment Coils for Wireless Power Transfer of Energy
Progress In Electromagnetics Research M, 2014
In this paper we present a detailed theoretical analysis of lateral and angular misalignment effects in RF coils. Radio-frequency (RF) coils are used extensively in the design of implantable devices for transdermal power and data transmission. A design procedure is established to maximize coil coupling for a given configuration to reduce the effects of misalignment on transmission efficiency. Formulas are derived for the mutual inductance between all possible coil configurations including the coils of cross section, thin solenoids, pancakes and filamentary circular coils whose axes are laterally and angularly displaced. Coils are in air. In this approach we used the filament method and the mutual inductance between filamentary circular coils placed in any desired position. We completely describe all mathematical procedures to define coil positions that lead to relatively easy method for calculating the mutual inductance between previously mentioned coils. The practical coils in implantable devices fall into two categories: disk coils (pancakes) and solenoid coils. From the general approach for calculating the mutual inductance between coils of rectangular cross section with lateral and angular misalignments the mutual inductance between misalignment solenoids and disks will be calculated easily and accurately.
An Efficient Design of Inductive Transmitter and Receiver Coils for Wireless Power Transmission
Electronics
Wireless power transmission (WPT) is commonly used today in many important daily applications, such as electric vehicles, mobile phones, and implanted medical devices. The transmitter and receiver coils are essential elements in the WPT system, and the coupling coefficient between these coils plays an important role in increasing the power transfer efficiency. In this work, we introduce a new approach to optimizing the coupling coefficient between the transmitter and the receiver coils by changing the geometries and locations of the coil turns. In the optimization process, the geometry of the turns varies from a rhombus to a circular and then a rectangular shape according to a quasi-elliptical parameter value. The Neuman formula is used to calculate the self-inductance, mutual inductance, and coupling coefficient for each specific geometry and turn location. The configuration with the highest coupling coefficient is then selected at the end of the optimization process. The final WPT...
A Sectional Matrix Method for IPT Coil Shape Optimization
In this paper, Neumann’s integral is evaluated for computing self-inductance using a multi-turn sectional matrix method. Analytical equations are derived considering the increase in dimensions of the coil due to an impinging air-gap between the turns. The resulting sectional self-inductance matrix is computed and the concepts of sectional partial self-inductance and sectional partial mutual inductance are introduced. The effects of the various partial inductances are considered as a function of the air-gap, dimensions and turns. Further, the mutual inductance of a pair of coils is considered and the coupling is obtained analytically. The coils considered are to be used for shape optimization of IPT coils. Finally, the results are compared with experimentation. This technique being generic can be applied to a number of different polygonal shapes and can be further simplified by the theory of vector decomposition of current elements. A case study with self-inductance and perimeter as optimization objective is considered.
Journal of Sensors, 2016
Electronic biomedical implantable sensors need power to perform. Among the main reported approaches, inductive link is the most commonly used method for remote powering of such devices. Power efficiency is the most important characteristic to be considered when designing inductive links to transfer energy to implantable biomedical sensors. The maximum power efficiency is obtained for maximum coupling and quality factors of the coils and is generally limited as the coupling between the inductors is usually very small. This paper is dealing with geometry optimization of inductively coupled printed spiral coils for powering a given implantable sensor system. For this aim, Iterative Procedure (IP) and Genetic Algorithm (GA) analytic based optimization approaches are proposed. Both of these approaches implement simple mathematical models that approximate the coil parameters and the link efficiency values. Using numerical simulations based on Finite Element Method (FEM) and with experimen...
Novel coil design and analysis for high-power wireless power transfer with enhanced Q-factor
Scientific Reports, 2023
The power transfer efficiency (PTE) is a crucial aspect for effective wireless power transfer (WPT) applications. The quality factor (Q) of the WPT coil plays a critical role in ensuring higher PTE. In this paper, a novel method of improving the Q of a WPT coil is proposed. Resistance reduction techniques are presented which involves variation of the trace pitch, width, and thickness. This approach targets the high AC losses centered in the inner turns, which subsequently results in an increased Q. Numerical analysis with respect to the inductance and resistance models are presented, analyzed, and compared to that of the EM simulation results. To verify the efficacy of the proposed coil structure, a prototype is fabricated where good agreement is achieved between the measured and simulated results. The proposed coil attained a quality factor increment of about 19.24% at 85 kHz in comparison to the conventional one. The proposed technique can be used to optimize planar spiral coils to attain higher Q. With the growing demand on remote transfer of power, there has been a significant amount of research into wireless power transfer (WPT) technology 1. The effective use of WPT systems pivots on convenience for the user where an electronic device could be utilized without plugging to a power source 1,2. Moreover, WPT systems have expanded to include applications such as electric vehicle charging, smart watches, implantable microelectronic devices (IMDs) and the Internet of things (IoT) 3. The design of highly efficient coils remains a crucial aspect for effective WPT operation 4. However, maximizing the efficiency of WPT systems becomes complex due to the existence of a trade-off behaviour in optimizing the coil parameters for power transfer efficiency (PTE), which suggests that optimizing one parameter makes the other less effective 5. This becomes a challenge where for instance, small solenoid coils for biomedical implants need to be realized with lightweight and miniaturized coils yet maintaining high efficiency 6. Power transfer by WPT systems can be influenced by the quality factor (Q) in the sense that the transmit (TX) and receive coil (RX) with a high Q can result in high efficiency of WPT systems. For planar coils, the Q mainly depends on the inductance and the resistance of the coil. Thus, the high Q indicator becomes crucial in coil design since losses are intensely caused by the high-frequency winding resistance 7-9. A number of literature studies have been done with respect to maximizing the PTE of WPT systems by improving the Q of the coil. A divide-and-merge technique to reduce skin effect and improve the Q-factor of thin film printed coils is proposed in 10. However, this technique is complex in its implementation and only applicable to spiral winding with just a single coil turn. Recently, a number of coil layout optimization strategies have been proposed pertaining to the coil width, coil pitch and trace thickness 11-16. Lopez-Villegas et al. 11 for example, introduced a layout optimization strategies which involves the varying coil trace width to reduce the overall resistance of the coil windings are proposed based on analytical model with investigations on inductor coil series resistance (i.e., ohmic and induced losses) due to conduction and eddy currents, respectively. A method of improving the performance of printed planar coils through the varying of trace width and turn-to-turn spacing (pitch) has been presented in 12. Moreover, the Q of a hollow spiral winding is improved by the combination of non-uniform coil turn width strategy with alteration of the internal diameter or the total number of coil turns altogether in 13,14. Thus, the losses in the inner turns of planar windings are suppressed which subsequently reduces the resistance of the coil. Furthermore, a design layout algorithm to minimize the resistance of coil winding with variable coil turn width is presented in 15. Again, the variations in coil turn width to achieve higher Q-factor by adjusting the gaps between coil turns, scaling factor and the number of turns has been demonstrated by Kim et al. 16 .
On Magnetically Coupled Coils Parameter Calculation
The Scientific Bulletin of Electrical Engineering Faculty, 2020
ANSYS Q3D Extractor tool (AQ3DE), using the quasi-static solvers (method of moments, integral equations and FEMs), is very efficient for computing and simulating two- and three-dimensional electromagnetic field. This simulation is used to extract parameters of interest, such as: resistance (R), conductance (G), self-inductance (L), mutual inductance (M) and capacitance (C). These parameters can be further used to optimize and to obtain automatically the design of a wireless power transfer systems (WPTS). The resulting matrices allow the generation of new matrices for any selected parameters. To complete the analysis, the model which is computed will be exported as an equivalent circuit. In this paper, starting from a given WPTS, using AQ3DE tool, the parameters of interest (R, G, L, M, C) were automatically calculated, and the SPICE equivalent circuit was obtained. The analysis was performed for two different distances between the emitter and the receiver. The electrical circuit the...
IEEE Journal of Radio Frequency Identification, 2021
The main purpose of Inductive Power Transmission (IPT) is efficient power transfer. Yet the ability to localize the receiver is itself an interesting goal. In Qi standards for wireless power transfer, the localization is performed by using a coils array. The resolution of localization is equal to the diameter of the coils in the transmitter array. Decreasing the diameter of coils in transmitters increases the resolution of localization but also reduces the range of power transfer. IPT is used in inductive RFID (Radio Frequency Identification) where a trade-off between resolution of localization and range of tag detection arises. This article proposes an original system making it possible to modify the resolution and the distance of operation independently. Calculations and simulations are implemented in MATLAB software. Experiments in low frequency validate the method and show the system capability to localize the receiver with good accuracy, with mean absolute error of 4 mm for localizing a receiver coil of 1 cm radius positioned in a box with dimensions 20*20*10 cm. Transmitter is a grid of 9 coils of 3.3 cm radius. After localization, the magnetic field is steered in the direction of the receiver to obtain a more efficient power transfer.
Fast Simulation of Wireless Power Transfer Systems With Varying Coil Alignment★
IFAC-PapersOnLine, 2015
A fast and accurate simulation framework for characterizing inductive power transfer systems with respect to coil alignment and frequency is presented. It combines the finite-element method with homogenization techniques and employs parametric model-order reduction. The reduced-order models feature low systematic errors and allow for thousands of evaluations per second. The proposed method is capable of handling litz wire coils.
2021
The proper selection of winding parameters for resonant circuits in inductive power transmission systems is an important issue, as it has a significant impact on system performance and power transmission, and these parameters can be optimized. Depending on the relationship between the coil design and the electrical parameters, the optimal number of coils can be selected for different criteria and protection conditions. This paper presents a method for calculating the geometrical and electrical parameters of planar coils used in parallel resonant systems for wireless power transmission (WPT) system, and for selecting the optimal number of coils. The equations for calculating the active resistance and inductance of the coils are normalized based on the given coil design parameters.. Practical examples of application of the selected method to transmitter and receiver windings of WPT systems are given. The obtained results indicates that the system performance and dissipated power are h...