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旋片式真空泵是最常用的真空获得设备之一,它工作范围广,可以单独使用也可以作为其它真空泵的前级泵。但是旋片泵的功率随着入口压力的变化而变化,有时甚至会相差1~2倍的功率,因此驱动旋片泵的电机大部分时间处于轻载运行,电机的效率因而降低了。本文通过分析旋片泵工作效率的影响因素与各种功率控制方法,结合变频式电机的应用实现对旋片式真空泵驱动电机的功率控制。
Rotary vane vacuum pumps are one of the most commonly used vacuum acquisition devices and feature a wide range of work that can be used individually or as a foreline pump for other vacuum pumps. However, the power of the rotary vane pump varies with the inlet pressure, sometimes even 1 ~ 2 times the power. Therefore, the electric motor driving the rotary vane pump is in light-load operation for most of the time, and the efficiency of the electric motor is thus reduced. In this paper, by analyzing the factors that affect the working efficiency of the rotary vane pump and various power control methods, the power control of the rotary vane vacuum pump driving motor is realized with the application of variable frequency motor.