Study on the Characteristics of Overhang Structure to Minimize Power Reduction Due to Leakage Flux in Axial Flux Motors

Radial flux motors (RFM) have achieved significant technological advancements to meet the high-power demands in various industries. However, due to their structural limitations, research on axial flux motors (AFM) has been actively progressing. Among them, yokeless and segmented armature axial flux (YASA-AFM) motor can generate high torque proportional to the motor diameter by utilizing its structural characteristics, thus offering enhanced output performance. Despite the ongoing research on the design of dual-rotor structures in YASA-AFM, there is a lack of clear criteria for efficient rotor diameter design to achieve high power output relative to volume. Furthermore, the air gap flux generated by the two rotors can cause flux leakage due to magnetic saturation in the single stator, potentially reducing the motor's output. To address these issues, this paper aims to study the rotor structure characteristics for minimizing flux leakage in AFM and provide criteria for efficient rotor diameter design. The analysis and validation of this study will be conducted using the finite element analysis software ANSYS Electronics Desktop 2024 R1. Through this research, we aim to improve the design of AFM and expand its applicability to a broader range of industrial fields.