Motor Base Through-Hole for Resin Sealing and Pin Positioning
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Solution Overview
Problem
Conventional motors with reduced thickness face challenges in resin flow and assembly variations, leading to potential contact between terminal pins and the base, which affects manufacturing precision and sealing efficiency.
Innovation Solution
The motor design includes a rotating portion with a stator, a base, a circuit board, and a conductive member, where the base has an axial opening to accommodate the conductive member, allowing resin to flow and seal effectively, reducing the likelihood of contact and enhancing manufacturing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between the base and the terminal pin is reduced to decrease motor thickness, then the motor thickness is reduced, but the resin is less likely to flow below the terminal pin and the terminal pin may come into contact with the base due to assembly variations
Solution Approach 1:
The base is segmented with a through-hole that separates the terminal pin positioning function from the sealing function. The through-hole allows the terminal pin to be positioned precisely without requiring the resin to flow completely below it, thus resolving the conflict between reduced thickness and manufacturing precision.
Solution Approach 2:
The through-hole in the base acts as an intermediary structure that mediates between the terminal pin and the resin. It provides a defined path for the terminal pin while allowing the resin to seal around it, eliminating the need for the terminal pin to be completely surrounded by resin and enabling better positioning control.
2Length of moving object
If the motor thickness is reduced, then the motor becomes more compact, but the resin sealing effectiveness is compromised
Solution Approach 1:
The base structure is segmented with a through-hole that separates the sealing requirement from the thickness reduction goal. The resin seals around the terminal pin at the through-hole opening rather than needing to flow completely below it, maintaining sealing effectiveness while allowing reduced motor thickness.
Solution Approach 2:
The sealing approach transitions from a vertical sealing path (resin flowing below the terminal pin) to a horizontal sealing path (resin sealing around the terminal pin at the through-hole opening). This dimensional change allows effective sealing with reduced motor thickness.
3Length of moving object
If the terminal pin is positioned closer to the base, then the motor thickness is reduced, but assembly variations cause the terminal pin to contact the base
Solution Approach 1:
The base is segmented with a through-hole that provides a defined positioning feature for the terminal pin. This segmentation creates a reference structure that maintains consistent positioning regardless of assembly variations, allowing the terminal pin to be positioned close to the base without contact issues.
Solution Approach 2:
The design changes the positioning parameter from relying on resin flow depth to relying on the through-hole geometry. The through-hole provides a fixed dimensional reference that maintains consistent terminal pin positioning, eliminating sensitivity to assembly variations.
Data Source
AI summary
A motor including a rotating portion that rotates about a center axis that extends vertically and a stationary portion that rotatably supports the rotating portion. The stationary portion includes a stator including a coil, radially facing at least a portion of the rotating portion, a base disposed axially below the stator, a circuit board disposed axially between the stator and the base, a conductor electrically connected to the coil and the circuit board, including an extending portion extending axially downward from the circuit board, and a resin portion covering the circuit board and the conductor, connecting the base and the stator. The base is provided in its axially upper surface with an opening that overlaps the conductor when viewed axially.