Design of a mutually coupled external-rotor direct drive E-bike switched reluctance motor

• Published in: IET electrical systems in transportation 2020-03, Vol.10 (1), p.89-95
• Main Authors: Howey, Brock, Bilgin, Berker, Emadi, Ali
• Format: Article
• Language: English
• Subjects: 3‐phase MCSRM; bicycles; commercially available permanent magnet e‐bike motor; commercially available permanent magnet motor; concentrated‐wound exterior‐rotor direct‐drive; design process; dimensional constraints; dynamic torque‐speed performance; electric bicycle; external‐rotor direct drive E‐bike; finalised performance capabilities; finite element analysis; machine control; machine theory; MCSRM performance; performance parameters; permanent magnet machines; permanent magnet motors; pole configuration; reluctance motors; Research Article; rotor pole configurations; rotors; stators; switched reluctance motor; thermal analysis; torque
• ISSN: 2042-9738; 2042-9746; 2042-9746
• DOI: 10.1049/iet-est.2018.5076

In this paper, a concentrated-wound exterior-rotor direct-drive electric bicycle (e-bike) mutually coupled switched reluctance motor (MCSRM) has been designed to match the performance parameters and dimensional constraints of a commercially available permanent magnet e-bike motor. Different stator and rotor pole configurations are compared for a 3-phase MCSRM. During the design process, many parameters have been evaluated and analysed. The finalised performance capabilities of all pole configurations are summarised, and the choice of pole configuration for the final design is justified. The full dynamic torque-speed performance of the finalised 15/10 MCSRM is presented, along with a detailed thermal analysis. Finally, the MCSRM performance is compared to a 12/16 non-coupled SRM and a commercially available permanent magnet motor.