Comparative Analysis of Inner and Outer Rotor Surface PM Machines Based on Optimization Dataset

This paper examines and compares the performance characteristics of inner and outer rotor surface permanent magnet (SPM) machines. Notably, this research distinguishes itself through a rigorous methodology that carefully selects an optimization dataset rather than relying on arbitrary data. Consequently, this methodology has yielded valuable insights in two significant aspects: 1) The trends of key design parameters for both inner and outer rotor types, such as split ratio, aspect ratio, and magnet-gap ratio, are revealed using the optimization dataset. 2) The torque-to-weight ratio values between the inner and outer rotor types are investigated from various perspectives. Through this analysis, it becomes numerically evident that a significant advantage can be obtained using the outer rotor type compared to the inner rotor type. Overall, this study provides valuable insights for researchers, particularly those involved in the initial design stage of SPM machines for both rotor types.