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一、前言利用差动变压器来测量位移时,一般需有组合激励电源和测量电路,如图1所示。环境温度的变化,不仅使差动变压器中的电感线圈和磁路的特性发生变化,而且会影响到激励电源和测量电路,从而降低了测量精确度。我们曾对国内若干厂的产品进行过测试,测试情况表明,一般由差动变压器引起的误差是它的灵敏度温度误差为(0.05%～0.1%)/1℃,而采用一般补偿措施的激励电源,它的输出温度误差为(0.05%～0.5%)/1℃,再加上测量电路的温度系数的影响,测量的精确度随着温度的变化而下降得更显著,甚至影响到正常工作。对差动变压器进行温度补偿,从方法上来讲通常有串联补偿和反馈补偿两种方法:串联补偿可以单独
Preface The use of differential transformer to measure the displacement, the general need to have a combination of excitation power and measurement circuits, as shown in Figure 1. The change of the ambient temperature not only changes the characteristics of the inductance coil and the magnetic circuit in the differential transformer, but also affects the excitation power supply and the measurement circuit, thereby reducing the measurement accuracy. We have conducted a number of domestic products tested, the test shows that the general error caused by the differential transformer is its sensitivity to temperature error of (0.05% ~ 0.1%) / 1 ℃, and the use of general compensation incentives , Its output temperature error (0.05% ~ 0.5%) / 1 ℃, together with the temperature coefficient of the measurement circuit, the accuracy of the measurement decreases with temperature changes even more significant, and even affect the normal work. The differential transformer temperature compensation, from the method of speaking, there are usually two series compensation and feedback compensation: Series compensation can be alone