基于FPGA直流电机的PWM控制转速闭环系统设计 毕业论文.doc

基于FPGA直流电机的PWM控制转速闭环系统设计 Based on FPGA direct current machine’s PWM control rotational speed closed loop department ABSTRACT In the electric drive system, the most widespread one velocity modulation method is adjusts the armature voltage the direct-current velocity modulation utilizes, but the PWM control technology has the main circuit to be simple, the turn-on frequency is high, the electric current easy continual overtone to be few, low-speed performance good, steady fast precision, high governor deflection wide and so on merits, therefore directs current the PWM velocity modulation systems application to be day by day widespread. The rotational speed, the electric current double closed-loop control cocurrent velocity modulation system has the good static state, the dynamic characteristic, applies the broadest direct-current velocity modulation system. This topic is designs a rotational speed, electric current double closed loop H double-pole type PWM the direct-current velocity modulation system. Utilizes the EDA technology in this system, based on the FPGA programmable logical control component, realizes the PWM control with the VHDL language programming. This design mainly uses the IGBT tube is because its throughflow energy is strong, the shutter speed is quick, the thermostability is good, and the driving circuit power to be small moreover the driving circuit to be simple. Because double-pole type control circuit in work time, the possible 4 switch component to be at on-off state, moreover when cut possibly has the top and bottom bridge arm nonstop accident, to prevent to go nonstop to, between the top and bottom bridge arms drive pulse, must establish the logical time delay. This design has mainly completed the H double-pole type PWM cocurrent velocity modulation systems main circuit, the ASR, the ACR, the examination feedback element and the overflow protection link and so on circuit design as well as the parameter computation, and has carried on the para