Linear Actuator Damper Placement for Vibration Inspection
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Solution Overview
Problem
Existing linear actuators with air dampers or silicone gel dampers between the movable and stationary elements require assembly to inspect vibration characteristics, making it difficult to evaluate damper performance before assembly.
Innovation Solution
A linear actuator design where a damper member is arranged between the coil holder and the yoke, eliminating the need for a case, allowing damper placement between the stationary and movable elements without a case, enabling inspection during assembly and effective resonance suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air damper is configured using the case in a conventional linear actuator, then resonance of the movable element can be suppressed, but vibration characteristics including damper performance cannot be inspected unless the linear actuator is assembled
Solution Approach 1:
The patent divides the actuator structure into separate modules: the coil holder assembly (with coil and damper member) and the yoke assembly (with permanent magnet), which can be independently manufactured and tested. This segmentation allows the damper member to be installed and inspected before final assembly, resolving the contradiction between resonance suppression and inspection complexity.
Solution Approach 2:
The damper member is pre-installed on the coil holder assembly before final actuator assembly. This preliminary action enables vibration characteristics and damper performance to be inspected on the coil holder assembly independently, eliminating the need to disassemble the complete actuator for inspection while still achieving resonance suppression in the final assembled product.
2Reliability
If a damper member such as silicone gel is arranged between the movable element and the case to suppress resonance, then vibration characteristics cannot be inspected unless the linear actuator is assembled
Solution Approach 1:
The coil holder serves as an intermediary structure that carries both the coil and the damper member. By placing the damper member on the coil holder rather than directly between the movable element and case, the design enables independent access to and inspection of the damper member before final assembly, while still maintaining its resonance suppression function in the complete actuator.
3Reliability
If a case is used to house the movable element and arrange the air damper, then the structure is complete and functional, but the structure becomes more complex and thicker
Solution Approach 1:
The patent merges multiple functions into the coil holder assembly: the coil holder not only supports the coil but also carries the damper member and provides mounting structures for the permanent magnet. This consolidation eliminates the need for a separate case structure, reducing actuator thickness while maintaining structural completeness and resonance suppression 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
Enables the arrangement of damper members without a case, allowing for the evaluation of vibration characteristics and resonance suppression during assembly, improving the reproducibility of vibration acceleration and reducing the actuator's thickness.
Implementation Method 1
a magnetic drive mechanism configured to linearly move the movable element in the first direction with respect to the stationary element
Implementation Method 2
a coil supported by a coil supporting unit of the coil holder, a first yoke arranged on the other side of the movable element and the stationary element, and a first permanent magnet held by the first yoke and facing the coil
Implementation Method 3
a damper member arranged between the movable element and the stationary element... resonance of the movable element can be suppressed
Implementation Method 4
even if the resonance of the movable element is suppressed by arranging a damper member such as silicone gel between the movable element and the case
Data Source
AI summary
Provided is a linear actuator including a movable element, a stationary element, a magnetic drive mechanism configured to linearly move the movable element in a first direction with respect to the stationary element, and damper member arranged between the movable element and the stationary element. The magnetic drive mechanism includes a coil holder arranged on the stationary element, a coil supported by a coil supporting unit of the coil holder, a first yoke arranged on the movable element, and a first permanent magnet held by the first yoke. The damper member is arranged in a portion where the first yoke and the coil holder face each other in the second direction. As a result, the damper member can be arranged between the stationary element and the movable element without using a case.