Linear Actuator Permanent Magnet Ring Segments Adhesion
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Solution Overview
Problem
The adhesiveness between permanent magnet ring segments and the magnetic armature in linear actuators deteriorates over time due to operational and temperature loads, leading to potential detachment and functional failure, especially in active engine mounts where vibrations and noise suppression are critical.
Innovation Solution
Incorporating an angular gap between the surfaces of the permanent magnet ring segments and the stator, along with a conical taper and higher permeability in the magnetic armature, reduces tilting moments and enhances adhesion by increasing radial attraction forces, allowing for the use of less performant adhesives or omitting adhesive bonding altogether.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive bonding is used to attach permanent magnet ring segments to the magnetic armature, then the segments can be securely fixed, but the adhesive deteriorates over time due to operational and temperature loads, leading to detachment and functional failure
Solution Approach 1:
The invention removes the adhesive bonding element from the system entirely. By designing the permanent magnet ring segments with inclined surfaces that directly contact the magnetic armature, the segments are retained through geometric constraint and magnetic attraction rather than chemical bonding. This extraction of the adhesive eliminates its degradation issues while maintaining secure attachment.
Solution Approach 2:
The invention replaces the chemical bonding mechanism (adhesive) with a mechanical-geometric retention system. The inclined surfaces of the permanent magnet ring segments create a mechanical interlock with the magnetic armature, combining geometric constraint with magnetic attraction forces to achieve reliable attachment without organic materials that degrade.
2Force
If permanent magnet ring segments are attached directly to the magnetic armature without angular gap, then strong magnetic attraction forces are generated, but tilting moments cause loosening forces that compromise adhesion
Solution Approach 1:
The invention introduces asymmetry through the inclined surfaces of the permanent magnet ring segments. Instead of radial alignment, the segments are angled relative to the magnetic armature surface, creating an asymmetric geometry that converts the magnetic attraction force into a beneficial mechanical interlock. This asymmetric design prevents tilting moments from causing loosening while maintaining strong magnetic attraction.
Solution Approach 2:
The invention changes the geometric parameter of the permanent magnet ring segments by introducing an inclination angle. This parameter modification transforms the force distribution, allowing the magnetic attraction to press the segments more firmly against the magnetic armature through the inclined surfaces, thereby converting potential loosening forces into stabilizing forces.
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 design improves the adhesion of permanent magnet ring segments to the magnetic armature across various operating points, reducing the need for mechanical fixation and enabling quicker assembly cycles while maintaining or enhancing the magnetic flux and attraction forces, thus preventing detachment and ensuring reliable operation.
Implementation Method 1
The magnetic field of the permanent magnet ring is superimposed by the electromagnetic field arising upon energizing the coil, thereby arising a linear movement of the magnetic armature as a result of electromagnetic forces
Implementation Method 2
The permanent magnet ring consists of several, mutually adjoining permanent magnet ring segments... The magnetic field of the permanent magnet ring is superimposed by the electromagnetic field
Implementation Method 3
there act, in dependence on the electrical energizing of the coil and as a result of the electromagnetic field generated thereby, loosening forces which necessitate an adhesive bonding of the permanent magnet ring segments to the magnetic armature
Data Source
AI summary
A linear actuator for an active motor mount of a motor vehicle includes a stator which has an electrically energizable coil for generating an electromagnetic field, as well as a magnetic armature which is mounted axially movable with regard to a longitudinal axis of the coil and has at least one permanent magnet ring which opposes the stator and has several permanent magnet ring segments. Between a surface of the permanent magnet ring segments which faces the stator and a surface of the stator which faces the permanent magnet ring segments there exists an angular gap with a gap angle (α) of preferably 4°.