A small inductance ring magnetic core inductance sorting device

Abstract

The invention discloses an inductance sorting device for a small-inductance toroidal core, which comprises a metal base, a toroidal core wound with a metal wire, an inductance test instrument and a metal column, wherein the toroidal core serves as a magnetic field source, and then the metal column, a metal cover and an uncovered metal box are contacted to form a closed magnetic passage; the uncovered metal box is matched with a toroidal insulating cover; the metal cover is movably matched with the toroidal insulating cover; the metal column penetrates through the metal cover, the toroidal insulating cover, the toroidal core and the uncovered metal box sequentially from top to bottom; symmetrical grooves and insulation convex pillars are arranged radially on the surface of the toroidal insulating cover; the insulation convex pillars can slide along the grooves; and graduation is arranged at the edges of the grooves. With the adoption of the structure, the insulation convex pillars can slide to the position of an inner ring of a to-be-detected magnet ring, and the position is taken as the fixed point by the follow-up to-be-detected magnet ring test, so that the testing error is reduced, and the testing is more accurate; and the insulation convex pillars can be regulated according to the inner diameter of the to-be-detected magnet ring, can be suitable for being used for testing magnet rings with different inner diameters, and are simple and convenient to use.

Description

technical field [0001] The invention relates to a small inductance annular magnetic core inductance sorting device. Background technique [0002] Small inductance ring cores, especially nickel-zinc ferrite cores, have a single-turn inductance unit at the nH level, and the existing inductance tester basically cannot directly test it; in order to test its inductance and avoid instrument and test errors, multiple turns are required The metal wire usually has more than 50 turns; after the test is completed, the winding wire is removed. The test is very inconvenient, time-consuming, laborious, inefficient, and a lot of wires are wasted. [0003] Chinese Invention No. 201120445738.0 published on July 11, 2012 discloses a sorting tool for toroidal magnetic core inductance; , metal platform, ring insulation cover, base, etc. [0004] Because there is a gap between the to-be-tested toroidal core and the metal post in this structure, the inductance of the toroidal core also changes ...

AI Technical Summary

Problems solved by technology

Although, after adopting the above structure, the test inductance is about 10μH, and the variation of different placement positions is more than 1μH, accounting for more than 10% of the test inductance, the test error is large, so the test is not accurate enough; some manufacturers will Add an insulating hollow cylinder between the ring core and the metal post to reduce the test error, but different ring cores need to make different insulating hollow cylinders, and need to be replaced and stored every time, which is very inconvenient to use

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