Magnetic Actuator Weight Adjustment Without Magnetic Path Loss
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Solution Overview
Problem
In actuators with magnetic drive mechanisms, weight adjustment of the movable body for vibration control can lead to a degradation of magnetic efficiency due to changes in the magnetic path and increased magnetic resistance.
Innovation Solution
The actuator design includes a movable body with a first magnetic member having a high magnetic flux density and a second magnetic member with a weight adjustment section that is deficient in thickness, allowing weight adjustment without altering the outer shape, thus maintaining the magnetic path integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the outer shape of the second magnetic member is reduced in size for weight reduction of the movable body, then the weight of the movable body is reduced, but the magnetic path is narrowed and magnetic resistance is increased, which reduces the magnitude of thrust
Solution Approach 1:
The patent applies local quality by making the second magnetic member deficient in thickness only in specific regions where magnetic flux density is low, while maintaining full thickness in regions where magnetic flux density is high. This localized structural variation allows weight reduction without compromising the magnetic path in critical areas, thereby resolving the contradiction between weight reduction and magnetic efficiency maintenance.
2Weight of moving object
If the shape of the second magnetic member is changed for weight adjustment, then the weight of the movable body is adjusted, but the second magnetic member can no longer be arranged at a position with high magnetic flux density, and magnetic efficiency is degraded
Solution Approach 1:
The patent implements local quality by varying the thickness of the second magnetic member according to the magnetic flux density distribution. The member is thinner in low flux density regions and maintains full thickness in high flux density regions, enabling weight adjustment while preserving optimal magnetic path configuration.
Solution Approach 2:
The patent resolves the contradiction by transitioning from a two-dimensional shape change approach to a three-dimensional thickness variation approach. Instead of changing the outer shape of the second magnetic member, the invention varies its thickness in the axial direction, creating a dimensionally optimized structure that maintains magnetic efficiency while adjusting weight.
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 the increase in magnetic resistance and maintains magnetic efficiency during weight adjustment of the movable body, ensuring strong vibrations can be output.
Implementation Method 1
a magnetic drive mechanism that includes a magnet and a coil and causes the movable body to move relative to the support body
Implementation Method 2
The first magnetic member includes: an end plate that is fixed to an end surface of the magnet; a bent section that is provided at an outer edge of the end plate; and a cylindrical section that extends from the bent section toward the magnet side
Data Source
AI summary
An actuator causes vibration of a movable body by a magnetic drive mechanism. The movable body includes: a support shaft having an outer circumferential surface fixed with a magnet; a cup-shaped first magnetic member fixed to an end surface of the magnet in an axial direction; and a second magnetic member fixed to an opposite side of an end plate of the first magnetic member from the side of the magnet. A weight adjustment section in the second magnetic member is a through hole. An outer shape of the second magnetic member is not reduced in size. A bent section of the first magnetic member overlaps an outer circumferential end of the second magnetic member. The weight adjustment section is provided on an inner circumferential side of an outer circumferential surface of the magnet. A magnetic member deficient portion is provided to avoid a portion with high magnetic flux density.