| Title | Direct-Drive Wind Generator Concept with Non-Rare-Earth PM Flux Intensifying Stator and Reluctance Outer Rotor |
| Publication Type | Conference Paper |
| Year of Publication | 2022 |
| Authors | Mohammadi, Ali, Badewa, Oluwaseun A., Chulaee, Yaser, Ionel, Dan M., Essakiappan, Somasundaram, Manjrekar, Madhav |
| Conference Name | 2022 11th International Conference on Renewable Energy Research and Application (ICRERA) |
| Date Published | sep |
| Keywords | composability, Direct-drive generator, Earth, electric generators, electric machine, FEA, flux-intensifying topology, Magnetic flux, Magnetic separation, pubcrawl, remanence, resilience, Resiliency, Rotors, spoke permanent magnets, Stator windings, toroidal winding, wind turbine, Windings |
| Abstract | This paper proposes a novel concept for an electric generator in which both ac windings and permanent magnets (PMs) are placed in the stator. Concentrated windings with a special pattern and phase coils placed in separate slots are employed. The PMs are positioned in a spoke-type field concentrating arrangement, which provides high flux intensification and enables the use of lower remanence and energy non-rare earth magnets. The rotor is exterior to the stator and has a simple and robust reluctance-type configuration without any active electromagnetic excitation components. The principle of operation is introduced based on the concept of virtual work with closed-form analytical airgap flux density distributions. Initial and parametric design studies were performed using electromagnetic FEA for a 3MW direct-drive wind turbine generator employing PMs of different magnetic remanence and specific energy. Results include indices for the goodness of excitation and the goodness of the electric machine designs; loss; and efficiency estimations, indicating that performance comparable to PM synchronous designs employing expensive and critical supply rare-earth PMs may be achieved with non-rare earth PMs using the proposed configuration. |
| Notes | ISSN: 2572-6013 |
| DOI | 10.1109/ICRERA55966.2022.9922808 |
| Citation Key | mohammadi_direct-drive_2022 |
Direct-Drive Wind Generator Concept with Non-Rare-Earth PM Flux Intensifying Stator and Reluctance Outer Rotor