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magnetic flux concentrators
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in Magnetic Flux Controllers in Induction Heating and Melting
> Induction Heating and Heat Treatment
Published: 09 June 2014
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in Magnetic Flux Controllers in Induction Heating and Melting
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 1 Magnetic circuit in a single turn coil with magnetic flux concentrator heating cylindrical part from the outside: Φ = total. Source: Ref 3
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Published: 09 June 2014
Fig. 27 Combined effect of a magnetic flux concentrator and a Faraday ring (also called a robber ring) on coil field distribution. Source: Ref 32
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in Design and Fabrication of Inductors for Induction Heat Treating
> Induction Heating and Heat Treatment
Published: 09 June 2014
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in Systematic Analysis of Induction Coil Failures and Prevention
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 21 Effect of a U-shaped magnetic flux concentrator on the electromagnetic edge effect in a single-turn induction coil. Compare with Fig. 17 . Source: Ref 15
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Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005842
EISBN: 978-1-62708-167-2
... magnetic flux concentrators solenoid coils THE LIFE OF INDUCTION COILS has a certain ending and uncertain timing. The goal of this article is to provide theoretical explanations and practical recommendations that would allow induction heating practitioners and designers to substantially increase...
Abstract
This article focuses on the frequently encountered causes of induction coil failures and typical failure modes in fabrication of hardening inductors, tooth-by-tooth gear-hardening inductors, clamshell inductors, contactless inductors, split-return inductors, butterfly inductors, and inductors for heating internal surfaces. It discusses the current density distribution and the skin effect, the proximity effect, and crack-propagation specifics. The article also describes selected properties of copper alloys, the electromagnetic edge effect of coil copper turn, and the effect of magnetic flux concentrators on coil life. It also reviews the importance of having appropriate and reliable electrical contacts.
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Published: 09 June 2014
Fig. 28 Comparison of power density distribution when applying a magnetic flux concentrator with a profiled single-turn inductor in selective heat treating. (a) Power density distribution generated by a bare coil (left) compared to coil with a U-shaped flux concentrator (right). (b) Coil
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Published: 09 June 2014
Fig. 23 Magnetic field distribution (a) without and (b) with a U-shaped magnetic flux concentrator located around the central leg of a split-return inductor. Source: Ref 19
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in Design and Fabrication of Inductors for Heat Treating, Brazing, and Soldering
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 14 Magnetic field generated by a butterfly coil heating a copper plate. The top image shows the effect of adding a magnetic flux concentrating material around the center turns.
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Published: 01 November 2010
Fig. 17 Magnetic field distribution without (left) and with (right) a U-shaped magnetic flux concentrator located around the central leg of a split-return inductor. Source: Ref 42
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in Systematic Analysis of Induction Coil Failures and Prevention
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 54 Magnetic field distribution without (left) and with (right) a U-shaped magnetic flux concentrator located around the central leg of a split-return inductor (results of computer modeling). Source: Ref 36
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Published: 09 June 2014
Fig. 30 Selective hardening of end regions of cup-shaped component; (a) FEA mesh and (b) computer-simulated magnetic field distribution at the final stage of heating using 2 two-turn inductors and “U”-shaped magnetic flux concentrators. Only the right half of the component is shown due to its
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in Systematic Analysis of Induction Coil Failures and Prevention
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 22 Laminations applied to a channel-type inductor function as a magnetic flux concentrator. Source: Ref 17
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in Systematic Analysis of Induction Coil Failures and Prevention
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 36 Gap-by-gap inductor that failed prematurely due to overheating of magnetic flux concentrator laminations. Source: Ref 28
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Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005841
EISBN: 978-1-62708-167-2
... tube fittings. Either rubber hoses (no metal braid reinforcement) or plastic tubing (e.g., polypropylene tubing) are used to connect the inductor back to the water-cooling circuit used to keep the inductor and induction power supply cool. Field Shield Materials and Magnetic Flux Concentrator...
Abstract
Inductors used for brazing can be machined from solid copper shapes or fabricated out of copper tubing, depending on the size and complexity of the braze joint geometry to be heated. This article provides information on inductors (coils) that are generally classified as solenoid, channel (slot), pancake, hairpin, butterfly, split-return, or internal coils. It discusses the variables pertinent to the design of inductors for brazing, soldering, or heat treating. The article presents various considerations for designing inductors for brazing of dissimilar materials that present a unique challenge in the field of induction brazing.
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Published: 01 February 2024
Fig. 19 Temperature distribution at intermediate stage of induction scan hardening of a hollow shaft using a two-turn scan inductor, consisting of an L-shaped magnetic flux concentrator. Adapted from Ref 2
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Published: 09 June 2014
Fig. 31 Results of computer simulation (using Flux2D finite element software) of induction hardening of selected areas of cup-shaped component using 2 two-turn inductors and “U”-shaped magnetic flux concentrator after 8 s of heating. Source: Ref 35
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Published: 01 November 2010
Fig. 51 Computer simulation of the sequential dynamics of induction scan hardening a hollow shaft using a two-turn machined integral quench (MIQ) inductor with an L-shaped magnetic flux concentrator ring (frequency = 9 kHz). See Fig. 52 and 53 . Source: Ref 109
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Published: 09 June 2014
Fig. 17 Computer simulation of the sequential dynamics of induction scan hardening a hollow shaft using a two-turn machined integral quench (MIQ) inductor with an L-shaped magnetic flux concentrator ring (frequency: 9 kHz). Images (e) through (i) illustrate the comet-tail effect manifested
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Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005846
EISBN: 978-1-62708-167-2
... with a magnetic flux concentrator heating a cylindrical workpiece from the outside. The magnetic flux in the system is equal to the ampere turns of the coil divided by the reluctance of the magnetic circuit. The reluctance of the magnetic circuit consists of three basic components: the back path for magnetic flux...
Abstract
Magnetic flux controllers are materials other than the copper coil that are used in induction systems to alter the flow of the magnetic field. This article describes the effects of magnetic flux controllers on common coil styles, namely, outer diameter coils, inner diameter coils, and linear coils. It provides information on the role of magnetic flux controllers for whole-body and local area mass-heating applications, continuous induction tube welding, seam-annealing inductors, and various induction melting systems, namely, channel-type, crucible-type, and cold crucible systems. The article also describes the benefits of the flux controllers for induction heat treating processes such as single-shot and scanning.
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