Induction heater having a conductor with a radial heating element
US5455402A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1994 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Jun 14, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/85
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An induction heater is provided which has an electrical conductor (40) extending along an axis B. At least one solid heating element (43) for contacting and transferring heat to a material to be heated extends radially from the axis B and is formed of electrically conductive and preferably ferromagnetic material. An alternating electric current is supplied to the electrical conductor (40) to induce an electric current in a closed loop defined by a surface layer of the or each heating element (43) to generate heat therein. Induced eddy currents are confined to a surface layer due to the skin effect. The radial and axial thickness of the heating elements (43) is greater than twice the skin depth of the electrically conductive material at the frequency of the alternating electric current. Preferably the heating element (43) is in the form of a screw arranged on an electrically conductive heating member (42).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.