Motor Bracket Terminal Protrusion for Load Distribution
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Solution Overview
Problem
Conventional motors face damage due to excessive force applied on the terminal holding portion when connecting a lead wire, leading to potential breakage.
Innovation Solution
A motor design featuring a terminal holding portion with a protrusion portion that projects downward from the bracket bottom portion, distributing the downward load and preventing excessive force on the connecting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a terminal holding portion is provided in a bracket bottom portion for connecting lead wires, then electrical connection is facilitated, but excessive force may be applied on the connecting portion causing breakage
Solution Approach 1:
The invention introduces a protrusion portion that extends in the axial direction (vertical dimension) from the bracket bottom portion, creating a three-dimensional load distribution structure. This transforms the originally planar connection point into a multi-level structure where the terminal holding portion and protrusion portion work together to distribute forces in multiple directions, preventing concentration of stress at a single point.
Solution Approach 2:
The bracket bottom portion is segmented into functionally distinct elements: the terminal holding portion for electrical connection and the protrusion portion for mechanical support. This segmentation allows each component to perform its specific function optimally - the terminal holding portion provides easy electrical connection while the protrusion portion provides structural reinforcement against excessive force.
2Adaptability or versatility
If the terminal holding portion extends radially outward from the bracket bottom portion, then lead wire connection is enabled, but the connecting portion between bracket bottom portion and terminal holding portion may break under downward load
Solution Approach 1:
The protrusion portion acts as a preventive reinforcement structure that is built into the bracket before assembly. It provides beforehand cushioning by distributing downward loads from lead wire connections before these forces can concentrate at the vulnerable connecting portion between the bracket bottom portion and terminal holding portion, thereby preventing breakage before it occurs.
Solution Approach 2:
The protrusion portion serves as an intermediary structural element between the bracket bottom portion and the terminal holding portion. It mediates the transmission of forces, providing a reinforced pathway that distributes loads and protects the original connecting portion from excessive stress during lead wire connection operations.
Data Source
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AI summary
A motor includes a shaft centered on a center axis oriented in a vertical direction; a bearing mechanism rotatably supporting the shaft; an armature disposed radially outward of the bearing mechanism; a bracket to which the bearing mechanism and the armature are fixed; and a covered cylindrical rotor connected to the shaft. The bracket includes a bracket bottom portion covering a lower side of the armature, and a terminal holding portion extending radially outward from an outer peripheral portion of the bracket bottom portion. The terminal holding portion includes a plate-like holding portion main body connected to the outer peripheral portion of the bracket bottom portion, a terminal disposed on an upper surface of the holding portion main body, to which a lead wire from an external power supply is connected, and a protrusion portion projecting downward from a lower surface of the holding portion main body at the same position in a radial direction as that of the terminal, or radially outward of the terminal.