Strong magnetic interference resistant non-magnetic rotation signal acquisition device

Abstract

The invention relates to a strong magnetic interference resistant non-magnetic rotation signal acquisition device, which comprises a PCB (printed circuit board) circuit board and a semicircular steelplate. An external inductance coil, a timer and a voltage comparator are integrated on the PCB circuit board, and four groups of inductance coils are uniformly distributed on the inner periphery of the external inductance coil, and the semicircular steel plate rotates to shield any two adjacent inductance coils in the four groups of the inductance coils to generate changing current signals. Outputends of the four groups of coils are connected with a signal processing circuit, the timer in the signal processing circuit is used for calculating a voltage comparison value changing period of the voltage comparator, and signal output ends of the voltage comparison and the timer are both connected to an external terminal through TTL output interfaces. The strong magnetic interference resistant non-magnetic rotation signal acquisition device is internally free of magnetic components such as permanent magnets and low in internal and external magnetic force influences, measuring of rotation numbers and rotation speed and judgment of rotation directions can be realized according to an LC oscillating principle, and accuracy in measurement is achieved.

Description

technical field [0001] The invention relates to the technical field of metering and sampling, in particular to a non-magnetic rotation signal acquisition device resistant to strong magnetic interference. Background technique [0002] The non-magnetic sensing technology is to place a semicircular non-magnetic steel sheet on the original mechanical rotating gear or pointer, and place the inductance in an LC resonant circuit above the pointer. [0003] In the prior art, the non-magnetic sensing acquisition method is realized by two winding coils. In this technology, a semicircular antimagnetic stainless steel sheet is set on the rotating shaft, and two inductors are used to rotate the stainless steel sheet forward and backward. When turning and turning to different positions relative to inductance one and inductance two, the generated damping waveform and undamping waveform judge the selection direction and rotation period of the stainless steel sheet, and then perform measurem...

AI Technical Summary

Problems solved by technology

However, the problem brought about by this is: when there is external strong magnetic interference, it will have a great impact on the damping waveforms received by inductance one and inductance two, resulting in errors and errors in counting

[0004] At the same time, since the consistency of the copper wire used in ordinary winding coils cannot be guaranteed, the consistency of the inductance cannot be guaranteed, so the detection accuracy and detection effect of the existing non-magnetic sampling technology are also unsatisfactory.

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