METHOD FOR MAGNETIZING MULTIPLE ZONES IN A MONOLITHIC PIECE OF MAGNETIC MATERIAL

摘要

An article having a multiple magnetic polarities and a method for making the article are disclosed. The article can be a monolithic substrate form from a metallic material or materials. The article may include a first magnetic polarity and a second magnetic polarity opposite the first magnetic polarity. Methods for making the article include provide either providing a monolithic substrate having a first magnetic polarity, or applying a first magnetic field to the monolithic substrate to impart a first magnetic polarity. The method may also include raising the temperature of the monolithic substrate in order to reduce the coercivity of the monolithic substrate. The temperature of the monolithic substrate may also be selectively raised to lower the coercivity of the monolithic substrate in associated areas. By lowering the coercivity, the second magnetic polarity may be imparted on the monolithic substrate.

主权项

1. A method for forming a magnet having magnetic multiple magnetic zones in a single monolithic substrate, the method comprising:
applying a first magnetic field to the single monolithic substrate to impart a first magnetic polarity to the substrate; heating portions of the single monolithic substrate to define regions of localized heating of the single monolithic substrate, wherein the regions of localized heating are reduced from a first coercivity to a second coercivity based on heating the portions of the single monolithic substrate; and applying a second magnetic field to the regions of localized heating to impart a second magnetic polarity to the regions of localized heating, the second magnetic polarity opposite the first magnetic polarity.