直流电机PWM调速系统中控制电压非线性研究  

Non-linear Research on Control Voltage in PWM Regulating Speed System of DC Motor

作　　者：李素娟[1] 蒋维安[1] 

机构地区：[1]中国民航飞行学院飞行技术学院,四川广汉618307

出　　处：《现代电子技术》2010年第22期196-198,202,共4页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(F02/60572179)

摘　　要：研究了直流电机PWM调速系统中控制电压的非线性,以实现精确的控制。通过实验和理论分析研究了空载情况下电机端电压平均值与电机转速、PWM波占空比与电机端电压平均值之间的非线性关系。实验表明,在不带电机情况下,PWM波占空比与控制输出端电压平均值之间呈线性关系;加入电机后,由于PWM在低电平期间电压的底端值不为0,所以占空比与电机端电压平均值之间呈抛物线关系。The non-linear characteristic of the control voltage in PWM regulating speed system of DC motor is researched to achieve the precise control. After some experiments and theoretical analysis, the non-liner relationship between speed and the average terminal voltage, as well as the relationship between the duty cycle of PWM wave and the average terminal voltage are researched without load, The experiment demonstrates that there is a linear relationship between the duty cycle of PWM wave and the average terminal voltage in the case of no motor, and however, when the motor is connected to the circuit and the PWM is at low level, the relationship between duty cycle of PWM and the average terminal voltage appears to be parabolic because the voltage at bottom end isn＇t zero.

关 键 词：控制电压 占空比 非线性 PWM 调速 

分 类 号：TN919-34[电子电信—通信与信息系统]