Contactless magnetic switch

Details Contactless magnetic switch Contactless magnetic switch

H - Electricity

01

H

340/135.6

H01H 36/00 (2006.01) G01B 7/30 (2006.01) H03K 17/97 (2006.01)

Patent

CA 1078491

CONTACTLESS MAGNETIC SWITCH Abstract of the Disclosure A contactless magnetic switch is provided by utilizing at least one pair of hollow elongated tubular magnetic sensing elements which are each threaded with at least one sense wire and a movable permanent magnet which is positioned adjacent and over the sensing elements. The magnet has two straight edges which in a nominal zero position of the switch extend along the longitudinal axes of the sensing elements, prefer- ably for a distance which is slightly longer than their lengths. The magnet is carried in a revolvable or otherwise movable carrier. If the carrier is revolvable, the magnet may be shaped as part of a circular disc and the two tubes may have their longitudinal axes disposed at an angle relative to each other so that when the permanent magnet is rotated in one direction from the initial zero position, one of the sensing elements will lie com- pletely under the magnet while the other will be removed from the magnet and not affected by it. Thus, the sensing element under the magnet will be substantially completely saturated, thereby providing a low output voltage on its associated sense winding while the other sensing element will be sub- stantially unsaturated thereby supplying a high output voltage on its sensing winding. As the permanent magnet is rotated in one direction or the other over the sensing elements, a sharp transition of the saturation state of the sensing elements provides the desired switching function.

295410

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