Dynamic Analysis of Micro-machined Diamagnetic Stable Permanent Magnet Levitation System

A novel micro-machined diamagnetic stable levitation system (MDSLS) which is composed of a free permanent magnetic rotor, a ring lifting permanent magnet and two diamagnetic stabilizers was presented. The static and dynamic stable characters of MDSLS were analyzed. The coupled non-linear differential equations were used to describe six-degree-of-freedom motion of the levitated rotor, and the equivalent surface current and combined diamagnetic image current method were utilized to model the interaction forces and torques between the lifting permanent magnet and rotor permanent magnet and also between the rotor permanent magnet and diamagnetic substrates. Because of difficulty to get analytical solution, the numerical calculation based on Runge-Kutta method was used to solve the dynamic model. The vibration frequencies were identified by fast Fourier transform (FFT) analysis. According to their resonance characteristics and parameters, the translational and angular dynamic stiffness were also calculated. The results show that the levitation of the rotor in MDSLS is stable, and the MDSLS is potential for the application in levitation inertial sensor.     

汽车ABS车轮转速传感器的检查和调整

汽车防抱死制动系统(ABS)的车轮转速传感器是整个系统中的最关键部件。系统准确无误的工作取决于传感器的正常工作。     

永磁涡流盘形制动装置的基本特性

盘形制动装置是铁路机车车辆机械制动最重要的部件之一,但它存在一些问题,如:维护成本高,会磨损、开裂、变形等.因此,我们设计了一种使用永久磁铁的盘形制动装置,它能保证制动系统可靠而又不会有上述问题.在日本铁道综合技术研究所的制动性能试验台上对这种装置的基本特性进行了试验,结果表明,制动初速度为300km/h,施加全冲程制动时,圆盘的最大制动转矩和最高温度分别为3.3 kN·m和598 C.该温度低于制动圆盘的限制温度.通过试验,我们认为这种装置可以用于铁路机车车辆.     

永磁轨道制动

ＯＫＥ（奥立康·克诺尔铁路技术）公司采用永久磁铁实现了磁轨制动。该装置适用于车辆的安全制动和停车制动。这两种功能由一套装置完成，以便安装、轻量化及操作。     

电控汽车几种自动控制装置的接通与断开

发动机燃油系统切断开关（又叫惯性开关、碰撞开关）的功用，是在汽车遭遇强烈碰撞或翻滚时断开电动燃油泵的电路，使燃油泵立即停止运转，以避免燃油从破损的油管中不断喷出而发生火灾。典型的燃油切断开关有永久磁铁、锥形体内的一个钢球、一块触发板或一组电触点组成。