以一伺服放大器为例,推导了电液控制系统中应用的电流负反馈放大器(伺服和比例放大器)的等效内阻及等效电压放大倍数的计算方法。介绍了上述特性参数的测试方法,计算与实测结果具有很好的一致性。 Taking a servo amplifier as an example, the calculation of the equivalent internal resistance and equivalent voltage magnification of the current negative feedback amplifier (servo and proportional amplifier) ​​used in electrohydraulic control system is deduced. The test method of the above characteristic parameters is introduced, and the calculation and the measured results have good consistency.