中文摘要：

针对电磁主动悬架用直线作动器推力密度低和推力波动大等缺点,提出一种分数槽结构的圆筒形永磁直线作动器,并建立作动器的有限元分析模型,通过理论计算其绕组反电动势验证了其正确性;同时,研究了作动器的作动力、响应时间和效率随速度和电源激励变化的规律.结果表明：作动器绕组的反电动势中含有3、2和4次的谐波分量;作动器作动力存在一定的波动,且随着电流增加而增大;作动器响应时间随着运行速度增加而减小;作动器效率与电压和速度相关,速度越大,效率越高,电压越大,效率越低.根据车辆在各工况下的悬架工作特性得出：当车辆侧倾时,作动器处于低速、大作动力、慢响应、高耗能的工作状态;当随机路面激励时,随着悬架运行速度的提高,应逐渐增大作动器电流激励的幅值和频率.

英文摘要：

Aimed at the low thrust force density and serious force ripple which are the major disadvantages of the linear actuator for active suspension,apermanent magnet tubular linear actuator with a fractional slot structure was proposed.The finite element analysis model of the actuator was established and verified by calculating the winding CEMF using the theoretical model.It is found that there are a series of harmonics including the 3rd,2nd,and 4th in the CEMF wave.Further analysis of the thrust force,response time and efficiency of the actuator show that there is some volatility in thrust force,and the force ripple increases with the increase of current.The response time is independent of the input voltage,and decreases with the rise of running speed.The efficiency is related to voltage and speed.As the speed increases,the efficiency increases;while the voltage increases,the efficiency dereases.The actuator working situations are proposed under various vehicle work conditions.Low speed and big electric current should be provided under vehicle roll movement.The amplitude and frequency of the current will be increased with the increase of the suspension speed on stochastic road.