CAJ | 학술논문

脉宽调制信号以其高效、灵活、抗干扰能力强的特点被广泛应用在电液比例控制系统中。由于磁铁材料的磁滞和运动的摩擦力会导致液压阀稳态特性存在明显的滞环现象，滞环严重影响了阀的动态响应性能，减小滞环比较有效的方法是在驱动信号中叠加一定频率的颤振信号，目前普遍采用改变PWM波占空比的方法来实现颤振信号的叠加。通过理论推导和实验研究证明：改变PWM波的频率参数能实现频率和振幅均独立可调的颤振，这种颤振叠加方式使电磁铁平均电流和颤振电流分别受PWM占空比和PWM频率的独立控制。
맥관조제신호이기고효、령활、항간우능력강적특점피엄범응용재전액비례공제계통중。유우자철재료적자체화운동적마찰력회도치액압벌은태특성존재명현적체배현상，체배엄중영향료벌적동태향응성능，감소체배비교유효적방법시재구동신호중첩가일정빈솔적전진신호，목전보편채용개변PWM파점공비적방법래실현전진신호적첩가。통과이론추도화실험연구증명：개변PWM파적빈솔삼수능실현빈솔화진폭균독립가조적전진，저충전진첩가방식사전자철평균전류화전진전류분별수PWM점공비화PWM빈솔적독립공제。
Plus Width Modulation (PWM)is widely used in proportional control systems for its characteristics of efficient,flexi-ble and strong ability of anti-interference. Due to the friction and hysteresis of electromagnet,hysteresis phenomenon was caused to ex-ist in characteristics of hydraulic valve in steady-state,and the dynamic response performance of the valve was seriously influenced by the hysteresis. The relatively effective method of reducing the hysteresis was by superimposing dithers with certain frequency and ampli-tude to the diving signal,currently,changing the duty ratio of PWM was widely used to implement the superimpose dither to the signal. Through both the theoretical deducing and experimental study,it proves that dither with independent adjustable frequency and ampli-tude can be generated by changing the frequency of the PWM,in this way of superimposing dithers,the average current of electromag-net and dither current can be controlled independently by the duty ratio and frequency of PWM separately.