MEASUREMENT OF VARIATION OF ELECTROMAGNETIC CENTER POSITION OF TRANSFORMER WINDING AND SEARCH COIL FOR DETECTING MAGNETIC FLUX DIRECTLY USED FOR MEASUREMENT THEREOF

摘要

PURPOSE:To enable measurement of variation of position in high accuracy by measuring the density of magnetic flux at nearly the center of the outermost height of a main winding coil. CONSTITUTION:In the case of the electromagnetic center positions of a primary and a secondary windings coincide, the variation of magnetic flux density due to the variation of position appears in a magnetic flux distribution curve at nearly the center height of a main winding cylinder and the density of magnetic flux is in proportion to the variation of position. If a search coil 10 for detecting magnetic flux is fixed at nearly the center of the height of the main winding coil cylinder of a transformer 1 and the search coil is made of a flexible thin plate, the search coil is closely fixed with the same curvature of the external surface of the cylinder. The seach coil is only placed on the outermost surface of the winding so the works are easy and the results of the measurement of the variation of position can be obtained rapidly and in high accuracy.