Ocean and wind energy require reliable, efficient electric conversion systems to be viable resources. Direct drive electric generators offer both benefits; however, it is difficult to generate the required torque at the low speeds typical of these resources. In this DOE sponsored project, ABB US Corporate Research partnered with Resolute Marine Energy (RME) and Texas A&M University to investigate the suitability of direct drive electric power generation for a paddle-type wave energy converter (WEC). This WEC provides high torque in a relatively chaotic, oscillating manner and requires a machine capable of handling high peak torques of approximately 40,000 N·m at speeds typically not exceeding 3 rpm. The baseline concept uses a hydraulic power take-off coupled with a generator and convertor; a direct drive electric solution may be beneficial. As a first step in designing a suitable direct drive generator for this application, we have begun with a smaller scale prototype targeting one tenth of the speed and torque, and we investigated a machine topology that may be promising in the operating regime of the full-scale machine. To this end, we designed and tested an integral generator and magnetic gear which is rated at 3,800 N·m at 30 rpm and completed a paper design for a machine of the required scale. This paper describes the mechanical design and testing of the prototype machine and provides some reflection on necessary design changes for the full-scale machine.
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ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- Power Division
- Advanced Energy Systems Division
- Solar Energy Division
- Nuclear Engineering Division
ISBN:
978-0-7918-5761-8
PROCEEDINGS PAPER
Advanced Direct Drive Electric Machine Enabling High Torque at Low Speeds Available to Purchase
Colin Tschida,
Colin Tschida
ABB US Corporate Research, Raleigh, NC
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Wen Ouyang,
Wen Ouyang
ABB US Corporate Research, Raleigh, NC
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Steven Englebretson
Steven Englebretson
ABB US Corporate Research, Raleigh, NC
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Colin Tschida
ABB US Corporate Research, Raleigh, NC
Wen Ouyang
ABB US Corporate Research, Raleigh, NC
Steven Englebretson
ABB US Corporate Research, Raleigh, NC
Paper No:
POWER-ICOPE2017-3506, V002T09A013; 9 pages
Published Online:
September 5, 2017
Citation
Tschida, C, Ouyang, W, & Englebretson, S. "Advanced Direct Drive Electric Machine Enabling High Torque at Low Speeds." Proceedings of the ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. Charlotte, North Carolina, USA. June 26–30, 2017. V002T09A013. ASME. https://doi.org/10.1115/POWER-ICOPE2017-3506
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