Active Guide Roller Actuator Structure for Coil Breakage Prevention
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Solution Overview
Problem
Existing active vibration reduction systems for elevators face challenges in preventing coil breakage due to unintended large external forces and in achieving downsizing while maintaining effective vibration suppression.
Innovation Solution
The active guide roller system incorporates a design where the bobbin and magnet, or the bobbin and yoke, are configured to contact each other instead of the coil and magnet, preventing coil breakage and allowing for a smaller actuator size without compromising the Lorenz force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between the coil and the magnet is set to be large to avoid contact, then the reliability of the coil is improved, but the Lorenz force is reduced and the actuator size must be increased
Solution Approach 1:
The patent introduces the flange portion as an intermediary protective element between the coil and the magnet. The flange portion is positioned such that it contacts the magnet first when excessive external force is applied, preventing direct contact between the coil and magnet. This intermediary structure allows the gap between coil and magnet to be smaller (maintaining high Lorenz force) while still protecting the coil from damage.
2Power
If the gap between the coil and the magnet is set to be small to increase the Lorenz force, then the actuator size is reduced, but the coil is vulnerable to contact and breakage under excessive external force
Solution Approach 1:
The patent implements beforehand cushioning by pre-positioning the flange portion as a protective barrier. The flange portion is designed to contact the magnet before the coil can contact the magnet under excessive external force conditions. This prior protective arrangement allows the system to operate with a small gap between coil and magnet for high Lorenz force while being pre-protected against potential damage.
3Reliability
If the actuator size is increased to compensate for reduced thrust force, then the coil-magnet gap can be larger, but the device cannot be downsized
Solution Approach 1:
The patent segments the actuator structure into distinct functional components: the coil assembly, the flange portion (protective element), and the magnet assembly. This segmentation allows the flange portion to serve as a dedicated protective element that does not interfere with the compact positioning of the coil and magnet. The segmented structure enables the actuator to maintain a small overall size while incorporating protective functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses car vibrations using the Lorenz force while preventing coil breakage, even under excessive external forces, and allows for a compact device design.
Implementation Method 1
when the coil is energized, a Lorenz force is generated in the coil by magnetic fluxes of the magnets
Implementation Method 2
a spring member configured to urge the guide roller into contact with the guide rail
Data Source
AI summary
In an active guide roller and an elevator device according to the present invention, one of an actuator movable portion and an actuator fixed portion includes: a yoke, and a pair of magnets, which are configured to generate a magnetic field intersecting a pivot plane of the guide lever, and another one of the actuator movable portion and the actuator fixed portion includes: a bobbin; and a coil. Contact between the coil and the magnet is avoidable by allowing the bobbin and the magnet to be brought into contact with each other or allowing the bobbin and the yoke to be brought into contact with each other when the actuator movable portion is displaced in a direction perpendicular to the pivot plane.