Motor Terminal Rib Cover Structure for Chip Containment
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Solution Overview
Problem
In conventional motors, the exposure of a rib for press-fitting and fixing leads to chip scattering when the connector is pressed against the rib during assembly, causing reliability issues.
Innovation Solution
The motor design includes a terminal with a lead wire terminal portion, an external terminal portion, and a holding portion that incorporates a rib and a cover portion. The cover portion extends in a direction intersecting the rib's extending direction, effectively containing any chips generated during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rib for press-fitting and fixing is exposed to the outside for connector fixation, then the connector can be firmly fixed to the holding portion, but chips scatter from the exposed rib end portion during press-fitting
Solution Approach 1:
The patent converts the harmful effect of chip scattering into a beneficial contained process by designing the cover portion that redirects scattered chips into the holding portion cavity. The rib remains exposed for necessary press-fitting operation, but the cover portion captures and contains the chips generated during this necessary operation, transforming the harmful scattering into a controlled process.
Solution Approach 2:
The cover portion acts as an intermediary element between the exposed rib and the external environment. It mediates the chip scattering process by providing a physical barrier that intercepts chips and redirects them into the holding portion, preventing direct scattering to the outside while maintaining the functional exposure of the rib.
2Ease of manufacture
If the rib is exposed for press-fitting operation, then connector assembly is enabled, but positioning accuracy of the terminal deteriorates due to chip interference
Solution Approach 1:
The cover portion converts the harmful interference of scattered chips on positioning accuracy into a controlled process by containing chips within the holding portion. This allows the rib to remain exposed for easy press-fitting operation while the cover portion ensures that chips do not interfere with terminal positioning accuracy.
3Object-generated harmful factors
If the rib is covered completely to prevent chip scattering, then chip scattering is prevented, but the connector cannot be press-fitted and fixed to the holding portion
Solution Approach 1:
The covering structure is segmented into two functional zones: the cover portion that prevents chip scattering, and the exposed rib end portion that enables press-fitting operation. This segmentation allows simultaneous achievement of chip containment and connector fixation capability.
Solution Approach 2:
Different portions of the covering structure have different qualities: the cover portion provides chip containment, while the exposed rib end portion provides press-fitting functionality. This local differentiation of quality allows the structure to simultaneously prevent chip scattering and enable connector fixation.
Data Source
AI summary
A motor includes a rotor that includes a shaft along a central axis extending in a vertical direction, a stator that includes coils and opposes the rotor in a radial direction, a casing that supports the rotor and the stator, and a terminal attached to the casing and electrically connected to lead wires extending from the coils. The terminal includes a lead wire terminal portion that is in contact with the lead wire, an external terminal portion that is electrically connected to the lead wire terminal portion and extends toward an outside of the casing, and a holding portion that holds the lead wire terminal portion and the external terminal portion.