EPSRC/GKN Studentship in Soft Composite Magnetic Materials

EPSRC/GKN 软复合磁性材料学生奖学金

• 批准号: 1876703
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1876703
• 关键词: EPSRC; GKN; Studentship; Soft; Composite

Electrical motors are at the heart of modern society and with the growing importance of electric vehicles, and in the medium to long term electric aircraft, their importance will grow. The ability to make compact and powerful motors with high efficiency is thus a key enabling technology.All motors contain soft magnetic materials that act to transmit magnetic flux. These materials generate losses in two ways, firstly through the hysteresis loop and secondly through eddy current losses. An ideal soft magnetic material thus combines high resistance, high saturation magnetisation with a low coercive field. It is difficult to find a single material that optimise all these properties and consequently most modern motors use laminated cores. The laminations serve to reduce eddy currents and the motor is designed so as to ensure so far as possible that the laminations cut across any likely current loops.The anisotropic nature of laminated cores is a constraint on the motor designer which would ideally be removed. One way of achieving this is to use magnetic materials made from particles of a soft magnetic material that are bonded together by an insulating layer. The small size of the insulated particles limits the eddy current losses. The performance of these materials is currently limited by the non-magnetic insulating layer in the material which allows flux generated by individual particles to close.The student working on this project will work closely with a leading manufacturer of soft magnetic composite powder GKN Sinter Metals, and their US subsidiary Hoeganaes Corporation, in order to gain a comprehensive understanding of how the physical and magnetic properties of the final pressed composite relates to the initial powder and the processing conditions. The successful applicant will develop a model of the compaction process that can then be used to develop improved process and materials. The project will involve the use of a wide range of experimental tools including SEM, X-Ray CT, SQUID magnetometry, mechanical testing in addition to materials modelling. The understanding gained will be used to develop improved materials and processing techniques, and thereby improved lightweight motors for a wide range of applications ranging from pancake motors for electric bikes to high speed and high power motors for aerospace.

电动机是现代社会的核心，随着电动汽车的重要性日益增加，在中长期电动飞机中，它们的重要性将增加。因此，制造紧凑、高效率、大功率电机的能力是一项关键的使能技术。所有电机都含有用于传输磁通量的软磁材料。这些材料以两种方式产生损耗，首先通过磁滞回线，其次通过涡流损耗。因此，理想的软磁材料结合了高电阻、高饱和磁化强度和低矫顽磁场。很难找到一种单一的材料来优化所有这些特性，因此大多数现代电机都使用叠片铁芯。叠片用于减少涡流，电机的设计应尽可能确保叠片能穿过任何可能的电流回路。叠片铁芯的各向异性特性是电机设计者的一个限制因素，理想情况下应消除这种限制。实现这一点的一种方式是使用由软磁材料的颗粒制成的磁性材料，所述软磁材料的颗粒通过绝缘层结合在一起。绝缘颗粒的小尺寸限制了涡流损耗。这些材料的性能目前受到材料中的非磁性绝缘层的限制，该绝缘层允许单个颗粒产生的磁通量闭合。从事该项目的学生将与领先的软磁复合粉末制造商GKN烧结金属及其美国子公司Hoeganaes Corporation密切合作，以获得最终压制复合物的物理和磁性如何与初始粉末和加工条件相关的全面理解。成功的申请人将开发一个压实过程的模型，然后可以用来开发改进的过程和材料。该项目将涉及使用广泛的实验工具，包括SEM，X射线CT，SQUID磁力测量，机械测试以及材料建模。所获得的理解将用于开发改进的材料和加工技术，从而改进轻型电机，用于从电动自行车的煎饼电机到航空航天的高速和高功率电机等广泛应用。