# US 5,345,065 A · Inductor with variable active length

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- Number: US 5,345,065 A
- Document ID: US5345065A
- Status: Granted
- Kind: A
- Application number: 08/103,891
- Filed: 1993-08-06
- Granted: 1994-09-06
- Earliest claimed: 1992-09-01
- Assignees: AEG-Elothern GmbH
- Inventors: Friedhelm Reinke; Jurgen Leisner; Waldemar Gezarzick
- Web page: https://patentgrep.com/patent/US5345065A

## CPC

- F27D 99/0006: {Electric heating elements or system}
- H05B 6/104: {metal pieces being elongated like wires or bands}
- H05B 6/44: having more than one coil or coil segment
- F27D 2099/0015: {Induction heating}
- F27D 2099/0058: {Means for heating the charge locally}
- Y02P 10/25: Process efficiency
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The invention relates to an inductor having two parallel main heating conductors which are interconnected at one of their ends via a bridge-shaped branch and are connected at their other end to a transformer, the connections also forming a bridge-shaped conductor branch. The characterizing feature of the invention is that disposed at least at one end of the parallel main heating conductors is a separate auxiliary inductor which is mounted displaceably in relation thereto and has two conductor portions parallel with the main heating conductors and inductively coupled thereto which are collectively interconnected at one of their axial ends via a bridge-shaped conductor branch determining the end of the heating zone and at the other end via a tunnel-shaped return conductor which over the whole displacement length is disposed beneath the bridge-shaped branch of the main heating conductors and is inductively coupled thereto.

## Claims

### Claim 1

An inductor having two parallel main heating conductors which are interconnected at one of their ends via a bridge-shaped branch and are connected at their other end to a transformer, the connections also forming a bridge-shaped conductor branch, characterized in that disposed at least at one end of the parallel main heating conductors (4) is a separate auxiliary inductor (7) which is mounted displaceably in relation thereto and has two auxiliary conductor portions (8) parallel with the main heating conductors (4) and inductively coupled only thereto which are collectively interconnected at one of their axial ends via a bridge-shaped conductor branch (9) determining the end of the heating zone and at the other end via a tunnel-shaped return conductor (10) which over the whole displacement length is disposed beneath the bridge-shaped branch (6) of the main heating conductors (4) and is inductively coupled thereto.

### Claim 2 (depends on 1)

An inductor according to claim 1, characterized in that the main heating conductors (4) are equipped with L-shaped magnetic plates (4a, 4b).