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在大型风力涡轮机中变得越来越重要，因为它们不需要齿轮箱，也不需要与之相关的高维护成本。然而，今天，所有现有的大型DD永磁调速器都使用稀缺且昂贵的稀土磁铁，这些磁铁几乎全部来自中国。Greenspur DD PMG使用普通铁氧体磁铁，虽然功率较小，但其质量成本是稀土磁铁的1/30，可以节省大量成本。在小规模试验、专利申请和行业积极反馈之后，该项目将使Greenspur能够与海上可再生能源弹射器（OREC）和华威制造集团（华威大学的一部分）合作研发，指定、建造和测试一台250千瓦的发电机。该公司的最终目标是授权其技术制造多兆瓦机组，用于迅速扩大的全球海上风电市场。

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.