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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.*

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.