Magnetic Force Control Device for Narrow Space Holding
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Solution Overview
Problem
Existing magnetic force control devices are limited by their height, restricting their application to narrow spaces and compromising holding force when reduced in size, with concerns about inadvertently releasing held objects due to external forces.
Innovation Solution
A magnetic force control device design featuring a first and second pole piece assembly with a shared coil, stationary and rotary magnets, and diamagnetic bodies, allowing for compact installation and stable holding with low electric power, enabling the device to operate effectively in narrow spaces while maintaining holding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the height of the magnetic force control device is reduced to fit narrow spaces, then the device can be installed in structures with limited space, but the holding force decreases and the rotary permanent magnet becomes vulnerable to external forces
Solution Approach 1:
The patent repositions the interaction surfaces from a vertical arrangement to a horizontal arrangement. The first and second pole pieces are positioned adjacent to each other in the horizontal direction, with their interaction surfaces facing each other. This dimensional change allows the device to achieve effective magnetic holding in a reduced vertical height while maintaining sufficient holding force through optimized horizontal magnetic flux paths.
Solution Approach 2:
The patent modifies the magnetic circuit parameters by introducing a third pole piece connected to the second pole piece, creating alternative magnetic flux paths. This changes the magnetic field distribution and allows the device to maintain holding force with reduced height by optimizing the magnetic circuit configuration rather than simply scaling down all dimensions.
2Volume of stationary object
If the overall size is reduced to fit narrow spaces, then installation space is optimized, but the device becomes vulnerable to inadvertent rotation by external forces
Solution Approach 1:
The patent introduces a third pole piece connected to the second pole piece, creating a localized structural reinforcement in the magnetic circuit. This additional pole piece provides enhanced mechanical support and magnetic circuit stability specifically in regions vulnerable to external forces, without requiring a proportional increase in the overall device size.
Solution Approach 2:
The magnetic circuit is constructed as a composite system combining permanent magnets, electromagnets (coil-wound pole pieces), and ferromagnetic materials in a unified structure. This composite approach creates a more rigid and stable magnetic circuit that resists external forces better than simpler configurations, while maintaining compact dimensions.
3Length of stationary object
If the interval between pole pieces is reduced to decrease device size, then the device becomes more compact, but the holding object may be released due to inadvertent rotary magnet rotation
Solution Approach 1:
The magnetic circuit is segmented into multiple independent components: first pole piece, second pole piece, and third pole piece, each serving specific functions. This segmentation allows the interval between pole pieces to be minimized for compactness while the distributed magnetic flux paths through multiple segments maintain holding stability even with reduced spacing.
Solution Approach 2:
The patent employs a controllable electromagnet (coil-wound pole pieces) working in conjunction with permanent magnets. The electromagnet can dynamically adjust the magnetic field strength and polarity, providing active control over the holding force. This dynamic control compensates for the reduced mechanical stability caused by smaller pole piece intervals, preventing inadvertent release.
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
The solution allows for stable magnetic body holding and release in narrow spaces with reduced height, maintaining high holding force and efficiency, and preventing unintended release of objects.
Implementation Method 1
a coil wound around at least one of the second pole piece and the third pole piece... configured to be rotatable by controlling a current flowing through the coil
Implementation Method 2
a magnetic force control device configured to control magnetic force to hold a magnetic body... the rotary magnet and the stationary magnet form a closed magnetic loop or form a magnetic flow that diverges
Data Source
AI summary
Disclosed is a magnetic force control device improved to be installed even in a narrow space having a small height. The magnetic force control device includes a first pole piece having a first interaction surface, a second pole piece having a second interaction surface, a third pole piece connected to the second pole piece, a coil wound around at least one of the second pole piece and the third pole piece, a stationary magnet fixed between the first pole piece and the second pole piece and a rotary magnet disposed between the first pole piece and the third pole piece and configured to be rotatable by controlling a current flowing through the coil.