CAJ | 학술논문

脉宽调制（ PWM）技术以其高效、灵活和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产生的摩擦力导致电液比例阀稳态特性存在明显的滞环现象，严重影响了电液比例阀的动态响应性能，改善滞环比较有效的方法是在驱动信号中叠加一定频率和振幅的颤振信号。针对反接卸荷式驱动电路的特点，详细分析了±24 V脉宽调制信号在电液比例控制中存在的寄生颤振，另外，根据实验得出，在高频状态下通过改变PWM波的频率可以实现频率和幅度均独立可调的颤振信号，同时该颤振叠加方式使得电磁铁平均电流和颤振电流分别受PWM占空比和PWM频率独立调节。
맥관조제（ PWM）기술이기고효、령활화항간우능력강적특점피엄범응용재전액비례공제계통중。유우자철재료적자체화운동산생적마찰력도치전액비례벌은태특성존재명현적체배현상，엄중영향료전액비례벌적동태향응성능，개선체배비교유효적방법시재구동신호중첩가일정빈솔화진폭적전진신호。침대반접사하식구동전로적특점，상세분석료±24 V맥관조제신호재전액비례공제중존재적기생전진，령외，근거실험득출，재고빈상태하통과개변PWM파적빈솔가이실현빈솔화폭도균독립가조적전진신호，동시해전진첩가방식사득전자철평균전류화전진전류분별수PWM점공비화PWM빈솔독립조절。
Plus With Modulation ( PWM) is widely used in proporational control systems for it is efficient ,flexible and anti-inter-ference.Due to the friction and hysteresis of electromagnet ,hysteresis exists when hydraulic valve in steady-state,and hysteresis influences the dynamic characteristics of the valve seriously ,the hysteresis can be improved by superimposing dithers with certain frequency and amplitude to the valve coil .Aiming at the character of anti-unloading power driver circuit ,analyzed the parasitic dither which exists in ±24 V PWM control ,besides ,the experiment shows that in a high frequency PWM ,dither with independent frequency and amplitude can be generated by changing the frequency of the PWM ,in this way,the average current of electromag-net and dither can be adjusted separately by changing duty ratio and frequency of PWM .