永磁屏蔽式耐高压高速开关电磁铁

为了提高电磁力、加快响应速度,提出一种永磁屏蔽式耐高压高速开关电磁铁,采用NdFeB稀土永磁材料作为磁屏蔽元件,减少漏磁并加快了动态响应.基于有限元方法建立电磁铁的动态数学模型,并通过实验进行验证,实验与仿真基本吻合,响应误差为3.2%,验证模型的有效性.在此基础上,对该高速开关电磁铁进行动态仿真,探讨永磁体长度、厚度、激磁方向,盆口高,耐压环厚度,隔磁片长度,前隔磁角和后隔磁角等结构参数对响应时间的影响规律.结合实际设计要求,结果表明,采用优化后的结构参数研制的永磁屏蔽式耐高压高速开关电磁铁在0.6 mm行程时的响应时间为2.20 ms.

Study of high-pressure high-speed on-off solenoid using permanent magnet shield

To increase electromagnetic force and to speed up response time,this paper proposed a high-pressure high-speed on-off solenoid using permanent magnet(PM) shield.By reducing flux leakage,the rare-earth NdFeB PM shield improves the dynamic response.A dynamic model of solenoid based on finite element analysis was established.The results from a simulation based on the model were verified by those from experiments while response error was 3.2%.The dynamic simulation analysis of the main structure parameters — such as PM length,PM thickness,PM direction,basin height,pressure ring thickness,nonmagnetic spacer length,front ring angle,and back ring angle — were performed for the PM shield type solenoid.Based on optimal design parameters selection and engineering practice,the response time of the high-pressure long-stroke high-speed solenoid with PM shield is 2.20 ms with a stroke of 0.6 mm.