#Universal current sensor ppt full#
Magnetoresistive field sensors are usually configures as a half or full bridge. When the current and magnetic moment are parallel, the resistance of the strip is greatest when they are at a 90 degree angle to each bother, it is smallest. In most general case, the electrical resistance of AMR material depends on the angle between the direction of the magnetization, and the direction of the current going through it. The ferromagnetic materials can be deposited as thin films and structured into small strips that are typically 40mm thick,10mm wide, and 100mm long. This phenomenon is called anisotropic magnetoresistive effect. The orientation could be changed by apply in an external magnetic field, and generally an increase in current was observed.
It is found that changing the orientation of the magnetic moment in the wire caused a current passing through it to change correspondingly. The same happens when the materials are forced into shape that is a mechanical anisotropy is imposed. Whenever these materials are exposed to a magnetic field during crystal formation, a preferred orientation in magnetization will result. They have in common a more or less strong anisotropy in their magnetic properties. Most of these alloys are composed of iron, nickel, and chromium, and may be primary or ternary. The anisotropic magnetoresistive effect is known to be present in a whole family of ferromagnetic alloys.
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