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varying speed system
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A new type trapezoid wave PWM technique employed in VFVS (varying frequency and varying speed) system was studied. The circuit principle and wave transformation as well as organization of sub circuit are demonstrated systemically. Furthermore, the delta PWM inverter, the key unit in system, are also discussed in paper. Experiment results show that the new technique has an ideal effect in harmonic wave suppression, high efficiency of energy conversion and advantage of smoothly...

A new type trapezoid wave PWM technique employed in VFVS (varying frequency and varying speed) system was studied. The circuit principle and wave transformation as well as organization of sub circuit are demonstrated systemically. Furthermore, the delta PWM inverter, the key unit in system, are also discussed in paper. Experiment results show that the new technique has an ideal effect in harmonic wave suppression, high efficiency of energy conversion and advantage of smoothly conversion between constant torque and constant power.

对新型梯形波脉宽调制技术的变频调速系统进行了分析和研究 ,系统地阐述了各部分电路组成、工作原理和波形变换 ,对“Δ”脉宽调制器作了深入讨论 .实验检测表明 ,该技术具有十分理想的抑制谐波的效果 ,系统能效比高 ,恒转矩与恒功率之间转换平滑

 
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