Control system for elevator cage guide magnets
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHiroshi Ando
Life of this patent
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Abstract
Continuous, vertically tensioned steel cables 31, 32 or straps 39, 40, 41 mounted in an elevator shaft 2 serve as tracking standards for air gap detectors 33, 34, 35 mounted to a passanger cage 5. The detector outputs differentially control electromagnet pairs 6, 7, 8 mounted on the cage and cooperable with vertical guide rails 1 to maintain the sensed air gaps at a constant, predetermined value.
Claims3
A contactless guide system for an elevator installation including a pair of vertical guide rails (1) mounted to and extending inwardly from walls of a hoistway (2) on opposite sides of an elevator cage (3, 5) suspended in the hoistway for up and down travel, and a plurality of electromagnets (6, 7, 8) mounted on the cage and disposed confronting but spaced from surfaces of the guide rails, characterized by:
- (a) continuous vertical tracking standard means (31, 32) mounted in the hoistway parallel to and spaced from the guide rails,
- (b) gap detector means (33, 34, 35) mounted on the cage and disposed proximate the tracking standard means for sensing air gaps between the tracking standard means and the detector means, and
- (c) control circuit means (18-22) for energizing the electromagnets in response to outputs from the gap detector means such that forces generated by the electromagnets act on the guide rails to maintain the sensed air gaps at predetermined values.
Dependencies are inferred from the claim text.