Electrical eddy current electro-mechanical transformation apparatus and method

Abstract

The present invention discloses an electrical eddy current electro-mechanical transformation apparatus and method. The electrical eddy current electro-mechanical transformation apparatus comprises a partially metallized disk, a printed circuit board, several induction coil pairs, an excitation device, and a measurement apparatus. The partially metallized disk is suitable for connecting to an external to-be-detected rotating part and synchronous rotation. The printed circuit board and the partially metallized disk are disposed in parallel and opposite to each other. The induction coil pair comprises a primary coil and a secondary coil. The primary coil and the secondary coil are separately coaxially disposed on both sides of the printed circuit board, and a central axis of each induction coil pair is parallel to a central axis of the partially metallized disk. The excitation device is electrically connected to the primary coil, and the secondary coil is electrically connected to the measurement apparatus. The primary coil and the secondary coil are coupled by means of a mutual induction effect. The measurement apparatus outputs a measurement signal according to an induction amount variation of the secondary coil. The electrical eddy current electro-mechanical transformation apparatus is simple in structure and convenient for installation. Further, a coefficient of mutual induction between the primary coil and the secondary coil is large, and power consumption is low.

Description

technical field [0001] The invention relates to the technical field of measurement and detection, and more specifically relates to an eddy current electromechanical conversion device and method. Background technique [0002] Generally speaking, liquid metering instruments measure data such as liquid flow rate and flow rate based on the rotation of rotating parts. Therefore, it is particularly important to detect data such as the number of turns, direction, and speed of the rotating component. At present, the electromechanical (ie, mechanical and electrical) signal conversion of water meters based on the eddy current effect is the most commonly used electromechanical conversion method for smart water meters. It can realize both cumulative flow conversion and instantaneous flow conversion. [0003] However, the existing electromechanical conversion devices based on the principle of eddy current still have some defects. There is such an existing solution, the excitation coil...

AI Technical Summary

Problems solved by technology

This scheme adopts the planar inductance coil in the form of printed board. Although the required installation space is small, the mutual inductance coefficient of the primary coil and the secondary coil is low because the central axes of the primary coil and the secondary coil do not coincide. It is beneficial for the excitation signal to be coupled from the primary coil to the secondary coil, and there is a large power loss

In addition, such a structure also limits the effective operating distance between the coil and the measured object, which is not conducive to increasing the operating distance of the coil to the measured object

[0005] It is also worth mentioning that the above two schemes do not consider the problem of static magnetic interference. When the external static magnetic field is interfered, the sensing coil signal will be wrong, resulting in a large conversion error of the electromechanical conversion device, which affects the normal use of the water meter.

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