An Asymmetric Fractional-Turn Coil Winding Method for Measuring Alternating Magnetic Field

Abstract

The invention provides an asymmetric fractional-turn coil winding method for measuring an alternating magnetic field. A disc for winding a coil is equally divided into an even number of fan-shaped areas passing through the center of a circle, and the fan-shaped areas are arranged clockwise to form a fan-shaped area 1 to a fan-shaped area N; each turn of coil is divided into N-1 fractional sub-turns, each fractional sub-turn is wound with a fan-shaped area, the winding directions of the fractional sub-turns of every two adjacent fan-shaped areas are opposite, and the fan-shaped areas N are vacated; the sub-turn coefficient ratio of the winding fractional sub-turns of the fan-shaped area 1 to the winding fractional sub-turns of the fan-shaped area N-1 is shown in the specification; each fractional sub-turn comprises a circumferential arc part and a radial straight line part, the circumferential arc part is wound around the circumferential part of the fan-shaped area, and the radial straight line part is wound around the radial tangent plane part, passing through the circle center, of the fan-shaped area; the size and direction of the magnetic field are judged through the rotating coil according to the induced electromotive force and the rotating angle. According to the invention, measurement processing of the magnetic field in space can be realized.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to an asymmetric fractional-turn coil winding method for measuring an alternating magnetic field. Background technique [0002] With the rapid development of science and technology, the current research content of scientific computing visualization focuses on the measurement of three-dimensional vector field. The current measurement method of non-uniform three-dimensional vector field is to convert the vector field into a scalar or tensor for output, but the orientation information of the vector field is difficult to accurately represent, resulting in inaccurate evaluation of the non-uniform three-dimensional vector field. Compared with 3D scalar field, the measurement of inhomogeneous 3D vector field is more challenging. At the same time, the development of measuring instruments and equipment for inhomogeneous three-dimensional vector fields is not perfect, so the research an...

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Problems solved by technology

[0003] In the field of geological exploration, with the development of technology, traditional exploration methods cannot meet the needs of geological exploration, and the application of pre-detection technology in geological exploration is becoming more and more extensive.

A type of forward detection sensor can detect formation information in advance, and can realize the evaluation of advanced formation. However, due to the poor detection performance of the current front detection sensor on the formation boundary, when the instrument moves in the formation, due to the interference of the background signal, Unable to accurately receive reflection signals from stratum boundaries, serious misjudgments in geosteering and stratum evaluation, and inability to effectively detect the position and size of stratum boundaries

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