Study on Electromagnetic‐Temperature Field Performance of Double Squirrel‐Cage Dual‐Rotor Permanent Magnet Induction Motor with Different Load Conditions

The permanent magnet rotors of the Permanent Magnet Induction Motor (PMIM) are currently designed to rotate freely. There are relatively few studies on the operation of permanent magnet rotors under load. This paper presents a thorough examination of the performance of Double Squirrel‐Cage Dual‐Rotor Permanent Magnet Induction Motors (DDPMIM) under varying load distribution ratios. The analysis includes permanent magnet demagnetization, steady‐state operational characteristics, and the distribution of the three‐dimensional temperature field. This study aims to fill the research gap in this area. First, the working principle of DDPMIM is analyzed. Second, the influence of the load distribution ratio on permanent magnet demagnetization is analyzed. Furthermore, the effects of the load distribution ratio on the efficiency, power factor, and temperature field of the motor are discussed during steady‐state operation. The research demonstrates that compared with the DDPMIM with load running on the squirrel‐cage rotor, whether the permanent magnet rotor is loaded alone or the squirrel‐cage and the permanent magnet rotor share the load together, the efficiency of DDPMIM is improved and the temperature is reduced, but the risk of permanent magnet irreversible demagnetization is increased. The research results suggest a new practical application for the DDPMIM. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.