基于DSP的大功率永磁直流电机调速系统设计

大功率永磁直流电机具有效率高、体积小等许多优点。设计了基于DSP的大功率永磁直流电机调速系统,系统功率电路采用IGBT模块作为开关器件,采用分时电路为主电路,即减小了输入电流的脉动,又减小了电机电流波动。为了减小系统的体积重量,系统没有输入电感,用IGBT储能电容抑制电压尖峰和输入电流纹波,给出了电容充放电电流计算公式,公式表明电容充放电电流最大值等于负载电流。利用PWM调制,实现了系统软启动、软关断和转速调节。实验表明,在最大转速时I,GBT电压尖峰小于输入电压的40%,输入电流波动小于额定值的25%。

Design of High Power PM DC Motor based on DSP Controller

High power PM DC motor has many advantages,such as high efficiency and small volume.In this thesis,high power PM DC motor based on DSP controller has been designed.In the system,main power circuit adopts time-sharing chop which can reduce both input current and motor current fluctuation.To make less heavy,the system dose not use in-ductance and IGBT storage energy capacitor for reducing current fluctuation and restraining peak voltage.The formulas about selecting capacitor have been given.Taking advantage of the PWM,the system implements soft-start,soft-stop and varying speed.The experiment revealled that the peak voltage of IGBT less than the 40% input voltage and the input cur-rent fluctuation less than the 25% rating value.