A Low Cost Ferrite Based Direct Drive Permanent Magnet Generator for Wind Turbines

Greenspur Renewables针对海上风能市场开发了一种新型低成本铁氧体直接驱动(DD)永磁发电机(PMG)。DD PMG对于大型风力涡轮机正变得越来越重要，因为它们消除了对变速箱的需求，并消除了与使用它们相关的高昂维护成本。然而，今天，所有现有的大型DD永磁发电机都使用稀有而昂贵的稀土磁体，这些磁体几乎完全来自中国。Greenspur DD PMG使用普通的铁氧体磁体，虽然功率较小，但按质量计算只有稀土磁体成本的三分之一，可以大幅节省成本。经过较小规模的试验、专利申请和行业的积极反馈，该项目将使Greenspur能够与离岸可再生能源弹射器(OREC)和华威制造集团(华威大学的一部分)建立合作研发伙伴关系，指定、建造和测试250千瓦发电机。该公司的最终目标是授权其制造多兆瓦机组的技术，用于迅速扩大的全球海上风能市场。

Greenspur Renewables has developed a new, low-cost, ferrite-based direct drive (DD) permanent magnet generator (PMG) aimed at the offshore wind energy market. DD PMGs are becoming increasingly important for large-scale wind turbines as they remove the need for a gearbox and the high maintenance costs associated with using them. Today, however, all existing large-scale DD PMGs use scarce and expensive rare earth magnets that are sourced almost exclusively from China. The Greenspur DD PMG uses ordinary ferrite magnets which, although less powerful, are 1/30th of the cost by mass of rare earth magnets and can deliver substantial cost savings. Following smaller-scale trials, patent filings and positive feedback from industry, this project will enable Greenspur to specify, build and test a 250kW generator in collaborative R&D partnerships with the Offshore Renewable Energy Catapult (OREC) and with Warwick Manufacturing Group (part of Warwick University). The company’s ultimate objective is to licence its technology for the manufacture of multi MW units for use in the rapidly expanding global offshore wind market.