锁相控制技术在中功率直流传动系统中的应用

本文介绍已用于某厂流速仪检定车电控系统之一部分,这个系统主回路采用:可控硅三相 全桥交叉联结供电;控制回路为环流可控并具有电流内环、速度外环和鉴频鉴相的三环结构, 同时控制2台3千瓦或4台22千瓦直流电动机,带动10吨重的拖车,在0.01米/秒-10米/ 秒的车速中稳定工作.用锁相环作频率给定,把锁相调速用在中功率电机拖动,对于保证给定 和反馈的准确性和再现性,扩大调速范围,改善动态品质,提高系统稳速精度,都具有明显效 果,使调速范围达到1:2500,系统精度优于0.1%.

The Application of Phase-Locked Technique to Medium Power DC Drive System

In this paper, a portion of the electric control system in the examine trailer of the flow rate instrument for a plant is described. The main circuit of the system is directly supplied by 3 phase SCR bridge in cross-connection. The control circuit is of circulating controllable and possesses the three-loop structure, i.e., the speed loop, the current loop, and the monitor loop in phase and frequency. It can control 2 sets of 3KW and 4 sets of 22 KW DC motor simultaneously and drive the 10-ton trailer to w, ork stably at the speed of 010l-10 m/s. When using the phase-locked loop as frequency reference and the phase-locked speed control in medium power DC motor, apparent effects can be got to assure accuracy and repetition of the reference, widen the speed control range, improve the dynamic quality, and raise the stabilized accuracy. The accuracy of the system is superior to 0.1% and the speed control range can up to 1:2500.