Force-Sense Operation Device Without Permanent Magnets
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Solution Overview
Problem
Existing force-sense-imparting operation devices for working machines, such as cranes, rely on expensive permanent magnets that are prone to demagnetization due to overcurrent or high temperatures, leading to inefficiencies and increased costs.
Innovation Solution
A force-sense-imparting operation device that generates torque using a magnetic force without a permanent magnet, employing a stator and rotor with excitation coils and magnetic pole sections that form a magnetic circuit to create a torque sensation for the operator, utilizing a switched reluctance motor drive principle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a permanent magnet is used to generate a large force sense (torque), then the torque output is improved, but the cost increases significantly and the reliability decreases due to demagnetization risk
Solution Approach 1:
The patent extracts and removes the permanent magnet from the system, replacing it with an excitation coil that generates magnetic fields only when needed. This eliminates the permanent magnet while maintaining the torque generation capability through electromagnetic induction, thereby resolving the contradiction between torque output and demagnetization resistance.
Solution Approach 2:
The patent replaces the permanent magnet (a static magnetic field source) with an excitation coil system that uses electromagnetic induction to generate the required magnetic field. This substitution allows dynamic control of the magnetic field and eliminates the reliability issues associated with permanent magnets under extreme conditions.
2Force
If a permanent magnet is used to generate a large force sense (torque), then the torque output is improved, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive permanent magnets with relatively inexpensive excitation coils and magnetic pole sections. These components can be manufactured using conventional materials and processes, significantly reducing the overall cost while maintaining the required torque output through controlled electromagnetic activation.
Solution Approach 2:
The patent changes the operational parameter from relying on permanent magnetic properties to using controllable electromagnetic fields. By adjusting the excitation current parameters, the system achieves the required torque without the need for expensive permanent magnet materials.
3Force
If overcurrent is supplied to the excitation coil to form a strong magnetic field, then the torque is improved, but the permanent magnet may undergo demagnetization
Solution Approach 1:
By removing the permanent magnet from the system, the patent eliminates the vulnerability to demagnetization that would occur under overcurrent conditions. The excitation coil generates magnetic fields only when current is supplied, and no residual magnetism remains when current is removed, preventing demagnetization damage.
4Force
If the operation device is used in high-temperature atmosphere or the excitation coil is heated by overcurrent, then the torque can be maintained, but the permanent magnet may undergo demagnetization or neutralization
Solution Approach 1:
The patent replaces the temperature-sensitive permanent magnet with an excitation coil system that is much more resistant to thermal effects. The electromagnetic field generation through the excitation coil does not suffer from the same thermal limitations as permanent magnets, allowing operation in high-temperature environments without demagnetization or neutralization.
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 solution allows for efficient torque generation and force sense presentation without the need for permanent magnets, preventing demagnetization and reducing costs, while also ensuring safe operation by preventing sudden turns and load imbalances.
Implementation Method 1
an excitation coil 106 and at least one first magnetic pole section 28 at which magnetic flux lines concentrate when the first magnetic pole section is excited by the excitation coil
Implementation Method 2
a magnetic circuit which encircles a periphery of the excitation coil on the cross section due to the first magnetic pole section and the second magnetic pole section being excited by the excitation coil
Implementation Method 3
the first magnetic pole section has a shape which encircles the excitation coil with the exception of the opposing site
Data Source
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AI summary
Provided is a force-sense-imparting operation device including a stationary section, a rotating section, and an operation member, wherein one of the stationary section and the rotating section has an excitation coil and a first magnetic pole section, the other of the stationary section and the rotating section has a second magnetic pole section which is capable of opposition to the first magnetic pole section in a specific opposing direction, the excitation coil has an opposing site which opposes the second magnetic pole section, the first magnetic pole section has a shape which encircles the excitation coil with the exception of the opposing site in a cross section perpendicular to a direction of flow of an excitation current in the excitation coil, and the second magnetic pole section has a shape which forms clearances in the opposing direction between the second magnetic pole section and each of the excitation coil and the first magnetic pole section when the second magnetic pole section opposes the first magnetic pole section and which forms a magnetic circuit in cooperation with the first magnetic pole section due to the second magnetic pole section being excited in a state where the second magnetic pole section opposes the first magnetic pole section, the magnetic circuit encircling a periphery of the excitation coil on the cross section, the second magnetic pole section being arranged so as to separate from the first magnetic pole section with rotation of the rotating section.