For this reason , it ' s application will be restricted . this paper designs a circuit topology structure of multi - functional converter , which contains rectifier , chopper and inverter , it can function in soft - starting , chopping and doubly - fed adjusting speed for doubly - fed motor 本文设计了一种适用于双馈电机多种运行状态的多功能变流器的拓扑结构，它将整流器、斩波器与逆变器结合在一起，能完成电机的软启动、斩波、双馈调速。
Abstract : the relationship between feed drive motor current and cutting force component is analyed and a mathematical model is set up by least square method . fuzzy - chip - based fuzzy control of milling process is implemented by using the current of feed motor as a cutting load measurement 文摘:分析了进给电机电流与相应的切削分力之间关系，用最小二乘法建立了它们之间的数学模型，以进给电机电流为监测切削负载的手段，实现了基于模糊芯片的铣削过程的模糊控制。
Simulations for these two conditions prove validity of theoretical analysis . on the basis of this scheme , a new speed adjustment strategy about vector control of doubly fed motor based on rotor current vector fixing is given . it introduces the closed - loop of stator excitation current to the system , which increases two adjustment channels : speed and excitation adjustment 经理论分析可知，该方案中，由于转子电流与磁链无法实现完全解耦，故仅在亚同步工况下有效，在超同步时则会因为调速系统不能自动校正转子磁链幅值变化引起的横向电流而使系统失去控制，无法达到稳定状态。
The contributions done are as follows : according to the mathematical model of doubly fed motor and the theory of vector control , a unit power factor of rotor control scheme is proposed . in the doubly fed adjustment system , in order to control magnetic torque of motor this scheme is designed by controlling the reverse direction between rotor voltage and current to keep the vertical direction between rotor current and flux . it is known from theoretical analysis that for partly decoupling this scheme is only effective under sub - synchronization speed , but not control the system and obtain steady state since speed adjustment system ca n ' t adjust the magnitude of rotor flux under sup - synchronization 而传统的无速度传感器双馈调速矢量控制系统，由于采用磁链定向方法，在同步速附近存在较大的工作死区，针对上述问题，本文做了如下的研究工作：本文从双馈电机的数学模型出发，根据矢量控制的基本原理，提出了一种转子侧功率因数为1的双馈电机矢量控制方案的设想，即在双馈调速时采用转子电流定向的方法，并控制外加转子电压与转子电流始终反相，以保持了转子电流与转子磁链矢量垂直，通过控制转子电流的大小来达到控制电机电磁转矩的要求。
