Vibration-Damping Actuator Inner Yoke Design for High-Frequency Control
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Solution Overview
Problem
Existing vibration-damping electromagnetic actuators face challenges in controlling operation at higher frequency ranges due to weight reduction, which compromises the generated force, making it difficult to achieve necessary oscillation forces in vibration-damping and vibration-control devices.
Innovation Solution
The design incorporates a tubular stator with a coil and outer yoke, and a mover with a permanent magnet and inner yoke, where the inner yoke has a thick part with a large axial dimension and a lightening part with a smaller axial dimension, allowing for strong magnetic forces and weight reduction, enabling control at higher frequencies without reducing the generated force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the permanent magnet size is reduced for weight reduction of the mover, then the mover weight decreases enabling higher frequency operation, but the force acting on the mover during energization decreases making it difficult to obtain necessary oscillation force
Solution Approach 1:
The inner yoke is designed with non-uniform thickness: a thick part with large axial dimension at the outer peripheral part to maintain strong magnetic force, and a lightening part with smaller axial dimension at the inner peripheral part to reduce weight. This local quality differentiation allows the mover to achieve both weight reduction for higher frequency operation and sufficient magnetic force for necessary oscillation
2Weight of moving object
If the inner yoke thickness is reduced for saving weight, then the mover weight decreases enabling higher frequency control, but it becomes difficult to dispose the inner yoke close enough to the inner tubular part of the outer yoke where a magnetic pole is formed, resulting in small generated force
Solution Approach 1:
The inner yoke features a thick part at the outer peripheral part with large axial dimension positioned close to the inner tubular part of the outer yoke to ensure strong magnetic interaction and sufficient generated force, while a lightening part at the inner peripheral part with smaller axial dimension reduces overall weight for higher frequency operation capability
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 maintains a strong magnetic force and allows for efficient control of the mover's displacement at higher frequencies, achieving a good vibration-damping effect across a broader frequency range.
Implementation Method 1
the effect of the magnetic field formed through energization to the coil displaces the mover relative to the stator in the axial direction
Implementation Method 2
a mover has a structure wherein the permanent magnet and the inner yoke are superposed to one another
Data Source
AI summary
A vibration-damping electromagnetic actuator including: a tubular stator including at least one coil member having a coil and an outer yoke attached to the coil; a mover including a permanent magnet and at least one inner yoke superposed in an axial direction of the stator, the mover being inserted into the tubular stator as axially displaceable relative to the stator through energization to the coil; and an inner tubular part provided at the outer yoke being superposed on an inner peripheral face of the coil to have a magnetic gap, wherein the at least one inner yoke has a thick part at an outer peripheral part thereof, and a lightening part at an inner peripheral part thereof so that an axial dimension of the inner yoke is smaller in a formation part of the lightening part than in the thick part.