Tobacco re - dryer , which is chiefly applied to roast the tobacco that is separated into leaf and stem so that the tobacco moisture is controlled at the range of technology demand , is main equipment in re - drying tobacco produce process . the present control method of tobacco re - dryer is that the references of every pid control link are set up and adjusted by human experiences . so , the control effect varies with the individual and the output tobacco moisture can ? maintain stable 烟叶复烤机是复烤生产线上的主要设备，它的主要用途是对打叶分离之后的烟叶片进行复烤处理，使烟叶片的水分、湿度达到规定的工艺技术指标；而目前复烤机的控制方式是通过人工设定烤机各段pid控制环参数，烤机调整完全依赖操作员的经验，因此控制效果因人而异，从而导致机尾水分不稳定。
The feedback of the output voltage is the major control loop . to achieve better frequency response and disturbance rejection of the input voltage , a input voltage feed - forward system is introduced in control loop . the duty - cycle of pwm applied at the gate of power mosfet is modulated by both input and output voltage 该芯片采用的控制方式为电压型pwm (脉冲宽度调制, pulsewidthmodulation )控制方式,以输出电压反馈作为主要控制参量,同时为了提高芯片对输入电压扰动的响应速度,采用了输入电压前馈方法,将输入电压因素引入了反馈控制环中,通过对输入输出电压的检测,控制加在功率mos管栅极电压上矩形脉冲的占空比,进而调节输出电压。
Fast torque control is an excellent feature of the dtc method . proper space voltage vectors are selected in the conventional pmsm dtc according to the errors between the reference torque , stator flux linkage and their estimated values , and the position of the stator flux linkage . the torque control algorithm is simply implemented by an optimal switching table , while the current control loop , which is commonly used in other control algorithms , is not required 在常规永磁同步电机直接转矩控制中，转矩的控制是直接根据转矩、定子磁链参考值与实际值之差为输入的两个滞环控制器的输出，定子磁链位置信号以及一个最优电压矢量开关表而选择一个最合适的电压空间矢量进行的，无需其它控制算法中经常用到的电流控制环。
