极压仪中直流电动机PWM调速下开关频率的选取

Selection of switch frequency in direct current electromotor PWM modulation.

文章介绍了以PHILIPS P87LPC768单片机为核心的极压仪(钻井液润滑测试仪)测试的基本原理,并结合直流伺服电机的控制技术,阐述了直流电动机PWM调速原理,电枢电流斩波控制中为使电感电流连续导通斩波器开关频率的选取,以及在整流过程中产生的纹波抑制的理论和方法问题。

This paper introduces the testing priciple of the drilling fluid lubrication tester,describes the priciple of direct current electromotor PWM modulatio,as well as ripple suppression theory and method in the switching process.