Motor Terminal Holding Portion Load Distribution
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Solution Overview
Problem
Conventional motors face damage due to excessive force applied on the connecting portion between the bracket bottom portion and the terminal holding portion when connecting a lead wire, caused by downward loads during terminal connection.
Innovation Solution
The motor design includes a terminal holding portion with a plate-shaped holding portion and a protrusion portion projecting downward from the bracket bottom portion, which distributes the load and prevents excessive force on the connecting area, using a resin material for the bracket and terminal holding components to reduce weight and enhance durability.
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 between the bracket bottom portion and the terminal holding portion due to downward load, causing motor damage
Solution Approach 1:
The terminal holding portion is segmented from the bracket bottom portion through a reinforcing rib structure. The reinforcing rib creates a distinct structural division that allows the terminal holding portion to be independently supported, preventing force concentration at the connection interface between the terminal holding portion and bracket bottom portion.
Solution Approach 2:
A reinforcing rib is added locally at the connecting portion between the bracket bottom portion and terminal holding portion. This local structural enhancement provides targeted strength reinforcement exactly where the downward load from lead wire connection is applied, without requiring overall bracket reinforcement.
2Ease of operation
If metal bus bars are used to facilitate connection between power supply and armature coils, then electrical connection is improved, but the motor structure becomes heavier
Solution Approach 1:
The material parameter of the terminal holding portion is changed from metal to resin. This material substitution significantly reduces the weight of the terminal holding portion while maintaining its structural integrity and electrical connection functionality through proper design of the holding structure and terminal configuration.
Solution Approach 2:
The bracket assembly uses composite construction with resin material for the terminal holding portion and metal components for structural support. This composite approach allows the lightweight resin terminal holding portion to perform its electrical connection function while metal reinforcing ribs provide the necessary mechanical strength, achieving weight reduction without sacrificing connection capability.
Data Source
AI summary
A motor includes a shaft, a bearing supporting the shaft, an armature disposed radially outward of the bearing, a bracket to which the bearing and the armature are fixed, and a 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-shaped 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, and a protrusion portion projecting downward from a lower surface of the holding portion main body at a same position in a radial direction as that of the terminal, or radially outward of the terminal.