Process and apparatus for the multipolar magnetization of a material in strips
AssigneeAimants Ugimag S.A.
InventorsClaude Bouchara, Robert Henaff, Pierre Jacob
Life of this patent
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Abstract
A process and apparatus for permitting the magnetization of materials in the form of sheets or strips, such as magnetic rubber, wherein one or two stacks formed by flat main magnets 1 adjacent to ferromagnetic pole pieces 2 in the vicinity of which (or between which) travels the strip to be magnetized. The main magnets adjacent to the same pole piece having opposing magnetizations as well as the magnets located face to face in each of the stacks. The device can be completed by field magnets .delta. and intermediate magnets 9.
Claims13
An apparatus for the multipolar magnetization of a hard magnetic material in the the form of a strip or sheet comprising two opposing stacks separated from each other by an air gap wherein the magnetizable material is moved laterally between the stacks, each stack being formed from main permanent magnets having parallel bases and a high coercive field and pole pieces formed of mild magnetic material, said pole pieces being positioned alternately between said permanent magnets, said magnets and pole pieces of each of said stacks being situated in opposing relationship, and the direction of magnetization of said main permanent magnets define opposing components of magnetization perpendicular to said bases of the facing main magnets and said strip.
A process for the multipolar magnetization of a hard magnetizable material in the form of a strip or sheet consisting of:
- (a) establishing a controllable external magnetic flux in a device having at least one magnetic stack, which stack is formed of permanent magnets and alternating pole pieces of magnetically mild material, each of said permanent magnets in said stack having a trapezoidal cross-section and a base comprising one of the parallel sides of said trapezoid defining a component of magnetization perpendicular to said base of said magnets and in a direction opposite to said permanent magnets adjacent said pole pieces,
- (b) moving said magnetizable material adjacent said base of said magnetic stack such that said pole pieces orientates and concentrates said magnetic flux along the width of said material, and
- (c) magnetizing said magnetizable material to impart non-traversing magnetization thereto.
A process for the multipolar magnetization of a hard magnetizable material in the form of a strip or sheet consisting of:
- (a) establishing a controllable external magnetic flux in a device utilizing at least two opposed stacks of permanent magnets and alternating pole pieces of magnetically mild material, each of said permanent magnets having a trapezoidal cross-section and a base comprising one of the parallel sides of said trapezoid,
- (b) establishing at least one component of magnetization perpendicular to said base and in a direction opposite to said permanent magnets adjacent said pole piece,
- (c) moving said magnetizable material past the lateral surfaces of said magnetic stacks such that said bases of said magnets orients and concentrates said magnetic flux along the width of said material,
- (d) directing magnetic flux to said magnetizable material such that the direction of magnetization of said main permanent magnets define opposing components of magnetization perpendicular to said bases of the facing main magnets, and
- (e) magnetizing said strip or sheet to impart traversing magnetization thereto.
Dependencies are inferred from the claim text.