Electromagnetic roller arrangement
AssigneeEMS Elektromagnetische Systeme GmbH
InventorHans-Jochen Karl Max Rindfleisch
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Abstract
A roller arrangement has a magnetic circuit that includes two rollers. The magnetic circuit consists of a cylindrical magnetic core, several poles axially distributed on the magnetic core, a cylindrical exciter and control windings arranged between these poles, a magnetic shell that encloses the whole circumference of one roller and is made of two parts separated by a ring-shaped secondary air gap, and a continuous magnetic shell in the axial direction arranged at the outer circumference of the other roller. When used to process webs of material in the textile, paper, plastic and metallurgical industries, this electromagnetic roller arrangement achieves high quality standards with a high productivity.
Claims18
An electromagnetic rolling device comprising
- a frame made of non magnetic material;
- two adjacent rollers predominantly made of ferromagnetic material, both of said rollers being pivoted within said frame so as to have a same axial direction, and being separated mechanically each from another at a non magnetic nip gap and connected magnetically each to another within a common magnetic circuit,
- wherein said magnetic circuit comprises
- at least one magnetic core being part of at least one of said rollers;
- several flange shaped magnetic legs extending radially outwards from said core;
- a magnetic yoke, which is constituted by the respective other of said rollers;
- magnetizing coils wound on said core forming a solenoid for magnetizing said magnetic circuit,
- said magnetizing coils being disposed each between two of said flange shaped magnetic legs,
- said magnetizing coils being provided with separate terminals, which have means for being connected to an electrical current source,
- said magnetizing coils each being charged by an exciting current in one magnetically active direction so that said magnetic core is magnetized homogeneously, each in its own axial direction;
- two magnetic shells, each of said shells being part of respective one of said rollers and extending in each case around the whole circumference of each said rollers, respectively, at least in sections of said rollers, which contain said magnetizing coils;
- said magnetic shell of at least that roller containing said magnetizing coils being divided into two adjacent magnetic shell parts by a non magnetic annular by-gap, being considerably wider than said non magnetic nip gap but narrower than said magnetic shell parts, wherein said magnetizing coils are disposed axially or approximately symmetrical with regard to the magnetic field;
- and
- a non magnetic gap space having a width between said rollers.
Dependencies are inferred from the claim text.