Electromagnetic Actuator Non-Magnetic Sleeve Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic actuators face challenges with messy adhesive handling, risk of armature jamming, abrasion, and breakage of permanent magnet rings, leading to assembly difficulties and potential functional issues.
Innovation Solution
A non-magnetic sleeve encloses the armature and permanent magnet rings, preventing abrasion and impact, eliminating the need for adhesive, simplifying assembly, and protecting against dirt and breakage, while a magnetic bearing tube with a sliding layer improves guidance and reduces tipping risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If permanent magnet rings are glued onto the armature, then the armature can be assembled, but the adhesive handling becomes difficult and messy with risk of excess adhesive contaminating other parts
Solution Approach 1:
The patent extracts the permanent magnet rings from the adhesive bonding process by providing them as pre-assembled units that are inserted into the armature housing. This eliminates the need for adhesive handling entirely, removing the mess and contamination risks while simplifying the assembly process.
Solution Approach 2:
The patent introduces an intermediary component (the armature housing with receptacle) that receives the permanent magnet rings. This intermediary structure provides a defined insertion path and positioning mechanism, replacing the adhesive as the means of attachment and eliminating adhesive-related handling difficulties.
2Device complexity
If permanent magnet rings are directly mounted on the armature, then the structure is simple, but the armature can jam on the inner walls and the magnets may break due to brittleness
Solution Approach 1:
The patent applies beforehand cushioning by providing a clearance or tolerance between the armature with permanent magnet rings and the inner walls of the housing. This pre-established gap prevents jamming during operation and accommodates any dimensional variations or thermal expansion without causing the armature to seize.
Solution Approach 2:
The patent employs a housing structure with a receptacle that provides protective enclosure for the permanent magnet rings. This shell-like structure protects the brittle magnets from impact and mechanical stress while allowing free movement of the armature, preventing both breakage and jamming.
3Device complexity
If permanent magnet rings are directly exposed, then the structure is simple, but they are susceptible to abrasion and breakage
Solution Approach 1:
The patent uses the armature housing as a protective shell that encloses the permanent magnet rings within a receptacle. This housing structure shields the brittle magnets from external mechanical stresses, abrasion, and impact forces, preventing damage without requiring additional protective components.
Solution Approach 2:
The patent implements nesting by placing the permanent magnet rings inside the armature housing receptacle. This nested arrangement provides inherent protection to the magnets, as the housing structure acts as a first line of defense against external harmful factors while maintaining a compact overall structure.
4Stability of the object's composition
If adhesive is used to mount permanent magnet rings, then the magnets are secured, but the assembly process becomes messy and time-consuming
Solution Approach 1:
The patent removes the adhesive bonding step entirely by designing a mechanical insertion system where permanent magnet rings are placed into a receptacle in the armature housing. This extraction of the adhesive process eliminates the time required for adhesive application, positioning, and curing while ensuring secure attachment through the receptacle design.
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 solution enhances assembly ease, prevents functional disruptions from magnet ring breakage, and improves sliding properties, ensuring reliable operation and increased stroke length with reduced risk of jamming and abrasion.
Implementation Method 1
When the excitation coils are energized, the armature is moved in the axial direction of the stator housing, with the direction of movement depending on the direction of the current
Implementation Method 2
a non-magnetic sleeve is provided which positively and radially and also axially encloses the armature with the at least one permanent magnet ring, so that the at least one permanent magnet ring is completely embedded
Implementation Method 3
a magnetic bearing tube with a thin, non-magnetic running layer is provided for guiding the armature, which tube is arranged concentrically to the excitation coils in the housing
Data Source
Figure 1
AI summary
The invention relates to an electromagnetic actuator (1) comprising a soft magnetic housing (2) with at least two axially spaced excitation coils (3), an axially displaceable armature (4) mounted concentrically to the excitation coils (3) in the housing (2), the armature (4) having at least one radially surrounding permanent magnet ring (5). According to the invention, a non-magnetic sleeve (7) is provided which positively and radially surrounds the armature (4) with the at least one permanent magnet ring (5).