Halbach Array Magnet Drive With Elastic Holding Member
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Solution Overview
Problem
Conventional shake correction devices with Halbach arrays face issues due to repulsive forces between adjacent magnets, which can lead to stress and potential breakage of magnets or contact members.
Innovation Solution
Incorporating an elastic holding member with shape portions that contact the magnets in the Halbach array, absorbing and relieving repulsive forces, thereby stabilizing the magnets and reducing the risk of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If permanent magnets are arranged in the Halbach array to increase magnetic force and electromagnetic force, then driving thrust is improved and power consumption is reduced, but repulsive force is generated between adjacent magnets which may break the magnets or contact members
Solution Approach 1:
The patent applies beforehand cushioning by providing a holding member with elastic shape portions that contact the permanent magnets before the repulsive forces can cause damage. The elastic portions are positioned to receive and absorb the repulsive forces generated between adjacent magnets in the Halbach array, preventing stress concentration and potential breakage of the magnets or contact members while maintaining the high magnetic force configuration.
2Force
If permanent magnets are arranged in the Halbach array to increase magnetic force, then electromagnetic force is improved, but repulsive force applies stress to magnets and contact members
Solution Approach 1:
The patent applies the intermediary principle by introducing a holding member with elastic shape portions as a mediator between the adjacent permanent magnets. This intermediary structure receives the repulsive forces and distributes the stress, preventing direct contact and stress concentration between the magnets themselves. The elastic portions act as a buffer that maintains the magnetic force benefits while protecting the magnets from excessive stress.
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 elastic holding member effectively absorbs repulsive forces, preventing damage to magnets and associated components, ensuring stable operation and reducing the likelihood of breakage in the drive device and image capturing apparatus.
Implementation Method 1
the holding member has elastic shape portions in contact with the permanent magnets, on surfaces thereof opposed to the permanent magnets in a magnet arrangement direction of the permanent magnets arranged in the Halbach array
Implementation Method 2
In the magnets arranged in the Halbach array, a repulsive force is generated between the magnets adjacent to each other
Implementation Method 3
Japanese Laid-Open Patent Publication (Kokai) No. 2019-095540 discloses a technique for increasing a magnetic force passing through the coils by employing the Halbach array as the array of the permanent magnets, and thereby increasing an electromagnetic force when electric current is caused to flow through the coils to improve a driving thrust
Implementation Method 4
Japanese Laid-Open Patent Publication (Kokai) No. 2019-095540 discloses a technique for increasing a magnetic force passing through the coils by employing the Halbach array as the array of the permanent magnets
Data Source
AI summary
A drive device capable of reducing a possibility that magnets or contact members are broken by repulsive forces generated between magnets arranged in the Halbach array. The drive device includes magnet units each including a plurality of permanent magnets arranged in the Halbach array and a holding member that holds the permanent magnets, a fixed portion, a movable portion that is movable with respect to the fixed portion, and coils. The magnet units are supported by one of the fixed portion and the movable portion. The coils are supported by the other of the fixed portion and the movable portion in a manner opposed to the magnet units, respectively. The holding member has elastic shape portions in contact with the permanent magnets on surfaces thereof opposed to the permanent magnets in a magnet arrangement direction of the permanent magnets arranged in the Halbach array.