Anisotropic Texture Development of High Energy NdFeB Permanent Magnets for Electric Vehicles and Automated Highway Systems

用于电动汽车和自动化公路系统的高能 NdFeB 永磁体的各向异性纹理开发

• 批准号: 9812074
• 负责人: Bimal Kad
• 金额: $ 4.7万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-01 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9812074&HistoricalAwards=false
• 关键词: Anisotropic; Texture; Development; Energy; NdFeB

The prospect of using advanced Neodymium-Iron-Boron (Nd2Fe14B) permanent magnet systems in electric vehicle motors, or other mobile platforms, is principally driven by i) the need to reduce input power requirements, as well as ii) to reduce the size and weight of drive systems. The decisive parameters for permanent magnet performance are its remnance (Br) and the maximum stored energy product (BH)max which provides a measure of the amount of work that can be extracted. In principle the larger the (BH)max, the greater the potential for reducing the size and weight of an existing device. In Nd2Fe14B permanent magnets, both Br and (BH)max can be improved 300-400% via anisotropic textural alignments of the crystallites during thermo-mechanical processing. This proposed project attempts to prescribe, and experimentally validate, micro-mechanics based deformation processing methodologies (forging, rolling or extrusion), to incorporate favorable 'c' axis textural alignments in Nd2Fe14B-based permanent magnets. These methodologies will be demonstrated for a variety of requisite final cross-section or shape (square, round, tape or ring magnets), with an eventual performance increase in both remnance (Br) and stored energy product (BH) max.

在电动车辆马达或其它移动的平台中使用先进的钕铁硼（Nd 2Fe 14 B）永磁体系统的前景主要由以下因素驱动：i）需要降低输入功率要求，以及ii）需要减小驱动系统的尺寸和重量。 永磁体性能的决定性参数是其剩磁（Br）和最大储能积（BH）max，最大储能积提供了可以提取的功量的度量。 原则上，（BH）max越大，减小现有设备的尺寸和重量的潜力就越大。 在Nd_2Fe_（14）B永磁体中，通过在热机械加工期间微晶的各向异性织构排列，Br和（BH）_（max）都可以提高300-400%。 该项目试图规定并通过实验验证基于微观力学的变形加工方法（锻造、轧制或挤压），以在Nd 2Fe 14 B基永磁体中纳入有利的“c”轴织构对齐。 这些方法将被证明为各种必要的最终横截面或形状（方形，圆形，磁带或环形磁铁），最终的性能提高在两个剩磁（Br）和储能产品（BH）最大。