Key element for the control of electromotors, especially for cra

Details Key element for the control of electromotors, especially for cra Key element for the control of electromotors, especially for cra

1995-04-11

1997-05-20

Ro, Bentsu

Electricity: motive power systems

Three-or-more-positions motor controller systems

Knee- or foot-operated controllers

318268, 318549, G01D 512, H02P 700, B66C 1322

Patent

active

056315309

ABSTRACT:
A key element for the control of electromotors, especially for cranes and other hoisting equipment. The key element includes a key switch pestle, a permanent magnet attached to the key switch pestle and a Hall sensor. The key switch pestle and permanent magnet are moveable both towards and away from the Hall sensor. As the permanent magnet approaches the Hall sensor, a flux density is sensed which triggers the generation of a control signal. In order to create a key element which can be installed in the smallest possible space, in controls and the like, the electronic circuit which includes a permanent magnet positionable toward the Hall sensor is integrated into the key element housing.

REFERENCES:
patent: 3562616 (1971-02-01), Elliott
patent: 3818292 (1974-06-01), Berman
patent: 4499449 (1985-02-01), Shinozaki et al.
patent: 4578624 (1986-03-01), Neki et al.

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