Segmented Pole Piece Coil Assembly for Magnetic Attraction
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Solution Overview
Problem
Conventional electromagnetic coil assemblies require excessive energy to maintain an armature plate in frictional engagement with the housing due to the direct electrical path created by the box-like cross-section construction, reducing magnetic attraction.
Innovation Solution
An electromagnetic coil assembly with a magnetically susceptible pole piece and a flange member that extends radially, allowing the coil assembly to be positioned within a channel structure without obstructing access, and featuring a contact surface for engaging the armature plate, enhancing magnetic attraction by directing flux lines effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a box-like cross section construction with multi-piece housing is used, then structural support is provided, but a direct electrical path is created between sidewalls through the pole piece, reducing magnetic attraction
Solution Approach 1:
The pole piece is divided into multiple segmented pole pieces that are electrically isolated from each other. This segmentation breaks the direct electrical path between sidewalls while maintaining structural support, thereby preserving magnetic attraction force.
Solution Approach 2:
Electrically insulating materials or coatings are introduced as intermediaries between the segmented pole pieces. These intermediaries prevent electrical conduction through the pole piece structure while allowing mechanical support functions to continue.
2Reliability
If conventional electromagnetic coil assembly design is used, then basic functionality is achieved, but excessive energy is required to maintain armature plate engagement
Solution Approach 1:
The segmented pole piece structure is pre-configured to optimize magnetic flux distribution before actuation. This preliminary structural arrangement enhances magnetic attraction efficiency, reducing the energy required to maintain armature plate engagement during operation.
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 reduces the energy required to attract and maintain the armature plate, increasing the attractive force between the pole piece and armature plate at various operating voltages, as demonstrated by comparative graphs showing higher attractive force with the new design.
Implementation Method 1
when the coil assembly is energized, magnetically attracts an armature plate
Implementation Method 2
a magnetically susceptible pole piece having a channel structure
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An electromagnet may comprise a pole piece (20) and coil assembly (30). The pole piece (20) may be magnetically susceptible and have a channel structure and a first flange member (22). The channel structure may have an annular inner side wall (24), an annular outer side wall (26) and an annular end wall (28) that fixedly couples the inner and outer side walls (24, 26) to one another on a first axial end (27) of the pole piece (20). The channel structure may be open on a second axial end (29) of the pole piece (20) that is opposite the first axial end (27). The first flange member (22) may be coupled to an end of one of the inner and outer side walls (24, 26) on the second axial end (29) and extend in a radial direction of the pole piece (20) towards an interior of the channel structure. The coil assembly (30) may be fixedly coupled to the channel structure between the inner and outer side walls (24, 26).