Integrated magnetic suspension rotor dynamic displacement measuring device

Abstract

The integrated dynamic displacement measurement device for magnetic suspension rotor comprises a measurement circuit, which includes: an input port connected with an output port of sine-wave generator, a drive module with output port connected at least four or more radial displacement sensors and one axial sensor. Besides, it also includes a full-bridge rectification filter module, a signal modulation module, a sampling holder, a multiplex switch, an A / D converter, and a CPU. This invention has well performance with low cost.

Description

technical field [0001] The invention relates to a digital measuring instrument, in particular to a dynamic displacement measuring device of a magnetic levitation rotor, which is especially suitable for measuring the dynamic displacement of the magnetic levitation rotor in various magnetic force bearing systems. Background technique [0002] Magnetic bearing is a new type of high-performance electromechanical integrated bearing that uses electromagnetic principles to stably suspend the supported part in space, so that there is no mechanical contact between the supported part and the supported part. It has high precision, low noise, less heat, and The incomparable advantages of ordinary bearings such as low power consumption. In the magnetic bearing system, the displacement signal of the magnetically suspended rotor is an important basis for controlling the stable suspension and high-speed rotation of the magnetic bearing. Therefore, the reliability, stability and accuracy of ...

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Problems solved by technology

This structure and measurement method has the following disadvantages: the weak analog signal output by the displacement sensor is easy to be connected with various interference signals during the long-distance transmission process, which increases the error of the measurement signal and reduces the reliability; the frequency of the excitation source of each channel is difficult. To be exactly the same, there will be mutual interference between channels during long-term transmission; the measurement errors generated by the A / D converters of each channel are inconsistent, which increases the difficulty of signal processing and control; 9 independent displacement measurement channels exist Obvious hardware redundancy; the displacement sensor is installed on the magnetic bearing stator housing, which increases the difficulty of machining and installation, coupled with the strict requirements for connecting cables, the volume of the measuring device, hardware cost and maintenance difficulty are significantly increased

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