Viscoelastic Actuator Coupling for Temperature-Stable Oscillation
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Solution Overview
Problem
Conventional actuators with magnetic drive mechanisms experience a decrease in vibration performance due to temperature changes, as the resistance of the coil increases with temperature, leading to a reduction in driving force and constant vibration inability.
Innovation Solution
A viscoelastic connecting element with a silicone gel material is used, where the loss tangent (Tan δ) decreases with rising temperature, balancing the decrease in acceleration caused by reduced coil current with an increase in acceleration due to the temperature characteristic, maintaining constant oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnetic drive mechanism with a coil is used to drive the movable body, then the driving force is generated through electromagnetic interaction, but the resistance value of the coil increases with temperature rise, causing the current to decrease and the driving force to weaken
Solution Approach 1:
The patent converts the harmful effect of temperature rise (which normally causes coil resistance increase and driving force reduction) into a beneficial effect by selecting a viscoelastic connecting element whose loss tangent decreases with temperature increase. This temperature-dependent property change compensates for the electromagnetic force reduction, transforming the temperature-induced problem into a solution that maintains constant vibration characteristics across temperature variations
Solution Approach 2:
The patent changes the physical parameter of the connecting element (loss tangent of viscoelastic material) to be temperature-dependent in a specific way. By selecting a material where the loss tangent decreases as temperature increases, the mechanical properties of the connecting element automatically compensate for the electromagnetic force reduction, achieving temperature compensation without additional control mechanisms
2Speed
If the coil is energized to produce vibration, then the movable body oscillates at resonance frequency, but the peak acceleration decreases as temperature rises due to reduced current
Solution Approach 1:
The patent converts the harmful temperature effect (reduced peak acceleration due to lower current) into a benefit by using a viscoelastic connecting element whose loss tangent decreases with temperature. This causes the peak acceleration to increase with temperature, compensating for the current reduction and maintaining constant vibration output
Solution Approach 2:
The patent employs a composite approach by combining the electromagnetic drive mechanism with a viscoelastic connecting element having specific temperature-dependent properties. The interaction between the electromagnetic system and the viscoelastic material creates a compensated system where the mechanical properties of the connecting element offset the electrical property changes of the coil
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 use of a viscoelastic connecting element with a temperature-dependent loss tangent ensures that the acceleration and oscillation of the movable body remain constant despite temperature changes, thereby maintaining consistent vibration performance.
Implementation Method 1
a connecting element (10) connected to the movable body (3) and the support body (2), wherein the connecting element (10) is a viscoelastic member
Implementation Method 2
the connecting element (10) is a viscoelastic member, and provided that Tan δ is a loss tangent of the viscoelastic member measured by a dynamic viscoelasticity measurement
Implementation Method 3
a magnetic drive mechanism (6) including a magnet (61) and a coil (62), to cause the movable body (3) to relatively move with respect to the support body (2)
Data Source
AI summary
The actuator includes a magnetic drive mechanism to relatively move the movable body with respect to the support body. The magnetic drive mechanism has a magnet and a coil. The connecting element connected to the support body and the movable body is a viscoelastic member. The viscoelastic member has a temperature characteristic that a loss tangent (Tan δ) thereof measured by a dynamic viscoelasticity measurement decreases as a temperature rises. When using a silicone gel as the connecting element, the decrease in the peak value of the acceleration of the movable body caused by the decrease in the current flowing through the coil is cancelled by the increase in the peak value of the acceleration of the movable body caused by the decrease in Tan δ of the silicone gel. Therefore, the oscillation of the movable body is unchanged even if a temperature changes.