Model and Development of a Five-Phase YASA Machine for Automotive Traction

This work presents the model and development of a five-phase yokeless and segmented armature (YASA) machine, optimized for automotive traction applications. Compared to conventional three-phase machines, the proposed design offers distinct advantages in terms of performance and reliability. The study begins by outlining the general specifications, rated values, and key dimensions of the machine. Analytical models for the main parameters are then presented. Using 3D finite element analysis (FEA), the primary electromagnetic characteristics are determined to support accurate transient modeling, and induction maps are generated to assess saturation under various operating conditions. An efficiency map is derived based on the maximum torque per ampere control strategy, demonstrating the machine's capability across a wide range of torque and speed. A prototype was constructed to validate the analytical and numerical results, confirming the machine's suitability for high-performance automotive applications.