Construction of a single-phase choke coil

The choke coil design with a circumferential iron core and 90-degree arranged iron cores with gaps effectively reduces eddy current losses by directing stray magnetic flux into adjacent cores, lowering winding temperatures and enhancing efficiency.

DE102017130203B4Active Publication Date: 2026-01-29FANUC LTD
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Patent Information

Application Number
DE102017130203
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2016-12-22
Filing Date
2017-12-15
Publication Date
2026-01-29
Estimated Expiration
2037-12-15

AI Technical Summary

Technical Problem

Existing single-phase choke coils suffer from increased winding temperature due to magnetic flux spreading from the gap and generating eddy currents, which current designs attempt to mitigate by keeping the windings away from the gap, but this approach is limited in reducing eddy current losses.

Method used

A single-phase choke coil design featuring an outer circumferential iron core and radially extending iron cores arranged at 90-degree intervals with magnetically coupled gaps between adjacent cores, allowing stray magnetic flux to pass into adjacent cores rather than penetrating the windings, and coils positioned away from the gaps.

Benefits of technology

This design significantly reduces eddy current losses by minimizing the penetration of stray magnetic flux into the coils, leading to lower winding temperatures and improved efficiency.

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Abstract

Single-phase choke coil comprising an outer circumferential iron core (20); at least four iron cores (41 to 44) which are in contact with or connected to the inner surface of the outer circumferential iron core (20), wherein the four iron cores (41 to 44) extend radially and are arranged at equal intervals in the circumferential direction such that the angle formed by the center lines of any two adjacent iron cores (41 to 44) is 90 degrees, wherein the iron cores (41 to 44) have inner ends which converge radially towards the center of the outer circumferential iron core (20), the angle of their tip end being 90 degrees; coils (51 to 54) which are wound around each of the four iron cores (41 to 44), wherein magnetically coupling gaps (101 to 104) are formed between two adjacent iron cores of the at least four iron cores (41 to 44), separating the inner ends of the iron cores (41 to 44) from each other; and at least one additional iron core (45) having the cross-section of an isosceles triangle, arranged between two adjacent coils (51, 54), wherein the coils (51, 54) are in contact with the inner surface of the outer circumferential iron core (20) and are surrounded by the two associated iron cores (41, 44), the outer circumferential iron core (20) and the additional iron core (45).
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