Pre-amplifier of inductosyn and inductosyn thereof

Abstract

The invention discloses a pre-amplifier of an inductosyn and an inductosyn thereof. The pre-amplifier comprises a pre-stage amplifier, a post-stage amplifier, a first potentiometer, a second potentiometer, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor. A pin 1 and a pin 8 of the pre-stage amplifier are electrically connected with the first potentiometer; a pin 2 and a pin 3 of the pre-stage amplifier are electrically connected with a fixed scale; a pin 6 of the pre-stage amplifier is electrically connected with a pin 2 of the post-stage amplifier; a pin 1 and a pin 8 of the post-stage amplifier are electrically connected with the second potentiometer; a pin 6 of the post-stage amplifier is electrically connected with the first terminal of the fifth capacitor; and a second terminal of the fifth capacitor outputs signals. According to the invention, the pre-amplifier has advantages of small in nonlinear distortion, good in amplitude-frequency characteristic and phase-frequency characteristic, high in bandwidth and small in temperature drift. And the pre-amplifier has a few of peripheral elementsand the circuit is simple and reliable, so that the stability of the inductosyn is improved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a preamplifier of an inductive synchronizer and an inductive synchronizer thereof. Background technique [0002] An inductive synchro is a sensor that converts linear displacement or angular displacement into an electrical signal. According to the different motion modes and structural forms, it can be divided into two types: disc type and linear type. The former is used to detect angular displacement, and the latter is used to detect linear displacement. It is widely used in horizontal boring machines and gantry milling machines in China to display the coordinate displacement of each axis of the machine tool. [0003] The inductive synchronizer has two working modes: the amplitude detection type and the phase detection type. There are four basic operation modes: ①Single-phase excitation, two-phase output, using phase detection method to accurately reflect displacement...

AI Technical Summary

Problems solved by technology

The electrical signal output by the inductive synchronizer is very weak. No matter whether the inductive synchronizer is amplitude-detection type or phase-detection type, whether it is disc type or linear type, it is necessary to use a preamplifier to amplify the output electrical signal without distortion. , in order to accurately measure the displacement, the domestic SF13 type preamplifier adopts a discrete component circuit, and a multi-stage amplifier is composed of a crystal triode. Due to the large dispersion of the characteristic parameters of the triode in the discrete component amplifying circuit, the volt-ampere characteristic of the triode is greatly affected by the temperature change. (such as magnification), the noise of the discrete component circuit is large, and the consistency of the product is poor, resulting in poor stability of the preamplifier

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