Shaft Linear Motor Ribs Enhance Resin Binding Strength
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Solution Overview
Problem
Conventional shaft linear motors face issues with sealing resin binding strength due to limited thickness of the armature portion's frame, leading to potential resin release during reciprocal movement, which affects noise, precision, and performance.
Innovation Solution
The introduction of ribs with varying sectional surfaces on the armature portion's frame allows for enhanced sealing resin binding, preventing resin release and enabling more stable component installation and higher performance components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the frame thickness is limited, then the motor structure remains compact, but the binding strength of sealing resin to the inner wall is insufficient
Solution Approach 1:
The patent introduces ribs with varying sectional surfaces that extend from the inner wall of the frame into the receiving space. This transforms the sealing resin attachment from a two-dimensional surface bonding problem to a three-dimensional mechanical interlocking structure, allowing the resin to wrap around and bind to the ribs, thereby significantly enhancing binding strength without increasing frame thickness.
Solution Approach 2:
The frame's inner wall is segmented by adding multiple ribs at different positions and heights. These ribs divide the continuous inner wall surface into multiple attachment zones, each providing additional surface area and mechanical interlocking points for the sealing resin, thus improving overall binding strength within the same volume constraint.
2Reliability
If sealing resin is used without enhanced binding structures, then the manufacturing process is simple, but the resin is likely to detach during reciprocal movement
Solution Approach 1:
By adding ribs with varying heights and sectional surfaces to the frame's inner wall, the patent creates a three-dimensional attachment structure that mechanically interlocks with the sealing resin. This resolves the reliability issue of resin detachment during reciprocal movement while maintaining relatively simple manufacturing processes through standard rib formation techniques.
3Strength
If the inner wall surface area for resin attachment is increased, then binding strength improves, but the frame thickness must be increased
Solution Approach 1:
The patent uses ribs that extend from the inner wall into the receiving space, creating additional attachment surface area in the radial dimension rather than increasing frame thickness in the axial dimension. This allows the sealing resin to bind to both the inner wall and the rib surfaces, effectively increasing the total attachment area without compromising the compact frame structure.
Solution Approach 2:
The frame structure is segmented by adding ribs that create multiple attachment zones on the inner wall. These segmented structures provide additional surface area for resin binding while maintaining the original frame thickness, as the ribs utilize the existing frame volume rather than requiring additional thickness.
Data Source
AI summary
A shaft linear motor includes an armature portion, a magnetic way and a sealing resin. The armature portion includes a frame, two ribs and a bobbin. The frame is formed with a receiving space therein. The two ribs are disposed on an inner wall of the frame. The ribs are respectively formed with a sectional surface. The bobbin is disposed in the receiving space and formed with an axially penetrated hole. The magnetic way is linearly and movably disposed in the axially penetrated hole. The sealing resin is fully filled in the receiving space for wrapping the inner wall of the frame and the sectional surfaces.