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一、前言性能较好的试验机调速系统,其特点是在大速比范围内,实现高精度的速度控制。可是,任何一个可实现的速比范围与速度控制精度,存在如下的关系:D_d=n_(ed)·S/△n_(ed) (1)式中:D_d——速比范围n_(ed)——额定负载转速S——静差率△n_(ed)——额定负载时电动机的转速降从上式可知,速比范围与控制精度是相互矛盾的。因此,若在大的动态范围内获得高的控制精度,继续采用传统的模拟控制方式,是很难满足要求的;因为模拟控制存在一系列原理性缺陷,既使速比范围 D_d=20dB,想要达到0.1%的控制精度也是极为困难的。综上所述,若在大速比范围内,获得高
I. INTRODUCTION Performance testing machine speed control system is better, which is characterized by speed ratio range, to achieve high-precision speed control. However, any achievable speed ratio range has the following relationship with the speed control accuracy: D_d = n_ ed × S / Δn_ ed where D_d - speed ratio range n_ (ed) - Rated load speed S - Static rate △ n_ (ed) - Rated load motor speed down From the above equation, the speed ratio range and control accuracy are contradictory. Therefore, it is difficult to meet the requirements if traditional control methods are used to achieve high control accuracy over a large dynamic range. Because analog control has a series of fundamental defects, even if the speed ratio range D_d is 20 dB, It is extremely difficult to achieve 0.1% control accuracy. In summary, if the speed ratio range, get high