Adual-rotor permanent magnet induction motor (DRPMIM) is an induction motor having two rotors within the same motor housing. This rotor arrangement can increase power density, efficiency, and reduce cogging torque.[1][2]
Stator on the outside
In one arrangement, the motor has an ordinary induction motor stator. A squirrel-cage rotor connected to the output shaft rotates within the stator at slightly less than the rotating field from the stator. Within the squirrel-cage rotor is a freely rotating permanent magnet rotor, which is locked in with rotating field from the stator. The effect of the inner rotor is to reenforce the field from the stator.[1]
Stator between rotors
In another arrangement, one rotor is inside the stator with a second rotor on the outside of the stator.[2]
Applications
Because of their greater power density dual-rotor permanent magnet induction motors are being considered for use in electric vehicles.
References
^ abDiao, Tongshan (2015). "Study on Dual-Rotor Permanent Magnet Induction Motor and Performance". The Open Electrical & Electronic Engineering Journal. 9 (1): 584–590. doi:10.2174/1874129001509010584. ISSN1874-1290.
^ abHwang, Myeong-Hwan; Lee, Hae-Sol; Yang, Se-Hyeon; Lee, Gye-Seong; Han, Jong-Ho; Kim, Dong-Hyun; Kim, Hyeon-Woo; Cha, Hyun-Rok (2019). "Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms". Energies. 12 (9): 1761. doi:10.3390/en12091761. ISSN1996-1073.{{cite journal}}: CS1 maint: unflagged free DOI (link)