In this paper point to point control , constant frequency control and up and down frequency control are studied , in which current lagging loop control method is used to restrict over currents . and using flux tracking method , position open loop , position close loop control system are also studied . and research results indicate that larger current ripples are restricted by means of subdividing space vectors 本文以永磁同步电动机为研究对象，分别对同步电动机的点动控制、恒频控制以及升降频控制进行了分析与研究，研究中采用了电流滞环控制方法，可有效地限制过电流现象；此外采用磁链跟踪法对位置开环和位置闭环的步进控制系统分别进行了探讨与研究，研究表明，采用矢量细分后，可有效地减小电流波动。
This machine have the point start , the half auto operate the way with full - automatic etc . , and adopt the hands button the operation , and the pressure can within the scope of certain and arbitrarily regulate , and the route of stroke then pass the route of stroke on - off to arbitrarily regulate , and operate simple , vivid , safety is dependable 本系列机器具有点动、半自动等操作方式，采用双手按钮或脚踏开关操作，压力可在一定范围内任意调节，行程则通过行程开关任意调节，操作简便、灵活、安全可靠。
