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The eddy current equivalent circuit method (hereinafter referred to as the CLN method) is a technique that represents the eddy current field using an equivalent circuit (ladder circuit), significantly reducing the computational load. Our company has developed a method that allows for the evaluation of Ritz wires, which have been difficult to analyze using the finite element method due to the complexity of their system, by applying the CLN method in a realistic timeframe. In this method, the Ritz wire is first homogenized, and then the AC loss is determined through AC analysis using the finite element method. By employing the Biot-Savart CLN method for the homogenization calculation, it eliminates the need to create a mesh for the air region of the analysis model. Additionally, by using an automatic mesh generation tool, the burden of mesh creation is significantly reduced. 【Features】 - Homogenization calculation of Ritz wires using the Biot-Savart CLN method - Evaluation of AC loss through AC analysis of the finite element method using the results of homogenization - No need to create a mesh for the air region in the Biot-Savart CLN method - Automation of mesh creation (up to 4-strand twisting) *For more details, please refer to the PDF document or feel free to contact us.

At SSIL, we have developed a method for evaluating the AC resistance of Litz wire coils using the "New Eddy Current Equivalent Circuit Method" (hereafter referred to as the CLN method). This method allows for the efficient and practical evaluation of the AC resistance of Litz wire coils. This document provides an overview of the method, so please refer to it. Our company offers analyses using the CLN method, including the evaluation of AC resistance for Litz wire coils. If you are interested, please feel free to contact us. *At SSIL, we enter into confidentiality agreements with our clients and manage confidential information in accordance with established procedures.

This document introduces a new eddy current equivalent circuit method (CLN equivalent circuit method) developed by our company. The CLN equivalent circuit method is a type of model order reduction, based on a new technique that utilizes the orthogonalization of predetermined functions, similar to the mode synthesis method. The conductor shape is represented by a mesh, but unlike conventional FEA, it determines the resistance and inductance of the ladder circuit by alternately performing static magnetic field and static electric field analyses. Additionally, by coupling the ladder circuit with electrical circuits and control circuits, it is possible to solve the eddy current field, including skin effect and proximity effect. 【Features】 ■ Equivalent circuits that include frequency dependence can be obtained in less computation time than conventional methods. ■ Not only frequency domain simulations but also time domain simulations are possible. ■ Conductors can be created using meshes and analyzed with FEA. ■ It is possible to achieve the same computational accuracy at a lower computational cost than conventional FEA circuit coupling analyses. *For more details, please refer to the PDF document or feel free to contact us.

We are developing a method to analyze systems that include multi-turn coils, represented by the Ritz line, using a new eddy current equivalent circuit method (CLN method) for homogenization, which allows for analysis within a realistic computation time. The CLN method is a technique that represents the eddy current field with an equivalent circuit (ladder circuit), significantly reducing the computational load of eddy current analysis, and enabling time-domain simulations using the obtained equivalent circuit. This document introduces an overview of how to utilize this method for a non-contact power supply system. 【Analysis Flow】 ■ Cell analysis using the CLN method ■ Electromagnetic field analysis using homogenized coils ■ System characteristic evaluation through circuit simulation *For more details, please refer to the PDF document or feel free to contact us.

In a wireless power transfer system, the position of the receiving coil changes relative to the transmitting coil, so it is necessary to determine the transmission efficiency of the system at multiple relative positions. This document introduces a method for performing magnetic field analysis at each relative position using the sliding method within a single analytical model. By using the sliding method, it is possible to conduct analyses at multiple relative positions with minimal effort using a common analytical model. Additionally, when a full model is created, displacement in the Y direction is also possible. 【Contents】 ■ Purpose and usefulness ■ Application details ■ Analysis examples ■ Analytical techniques that enable solutions ■ Summary *For more details, please refer to the PDF document or feel free to contact us.

When an alternating current is applied to a Litz wire, it is known that the resistance increases with higher frequencies due to the skin effect and proximity effect, and this AC resistance can be determined through electromagnetic field analysis. This document introduces examples of calculating the AC resistance of a Litz wire twisted in two stages using EMSolution. By utilizing the periodic symmetry conditions available in EMSolution, it demonstrates that AC resistance calculations using a three-dimensional model of the Litz wire can be performed with low computational costs. **Benefits of calculating AC resistance through electromagnetic analysis:** - Frequency-dependent characteristics of AC resistance can be obtained before prototyping. - The quantitative impact of the number of strands and twist pitch on AC resistance can be understood. - The current distribution within the strands can be visualized. - A deeper understanding of the phenomena can be achieved. *For more details, please refer to the PDF document or feel free to contact us.*