Spindle Motor Bushing for Lead Wire Insertion

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Solution Overview

Problem

Existing motor designs face difficulties in efficiently assembling lead wires due to the size constraints of insert holes, which can make it challenging to insert and connect the wires effectively.

Innovation Solution

A motor design featuring a base with a lead wire insert hole and a bushing with through holes and projecting portions that facilitate easy insertion and protection of lead wires, allowing for efficient assembly and connection while protecting the wires.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the size of the insert hole is reduced, then the motor structure becomes more compact, but it becomes difficult to insert the conducting wire into the opening

Engineering Contradiction:

Improvemotor structure compactnessVSAvoidwire insertion ease

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The through hole is segmented into two distinct portions: a first cylindrical hole portion and a second expanded hole portion with a larger opening. This segmentation allows the hole to serve dual functions - maintaining a compact overall structure while providing sufficient opening area for wire insertion in the expanded portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first cylindrical hole portion is nested within the second expanded hole portion, creating a concentric structure where the smaller cylindrical hole is contained within the larger opening hole. This nesting arrangement allows the wire to be inserted through the larger opening while the cylindrical portion provides structural integrity and positioning.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Volume of moving object

If the opening size is reduced for compactness, then the motor size decreases, but the lead wire protection becomes insufficient

Engineering Contradiction:

Improvemotor sizeVSAvoidlead wire protection

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The bushing acts as an intermediary component inserted into the through hole to provide lead wire protection. The bushing's cylindrical hole portion receives and protects the lead wire, while the expanded opening portion allows easy wire insertion. This intermediary structure resolves the conflict between compactness and protection by adding a dedicated protective element rather than enlarging the base hole.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10566872B2Spindle motor having a bushing for a lead wire

Publication Date: 2020.02.18 NIDEC CORP(JP)

AI summary

A motor includes a lead wire insert hole arranged to have a lead wire extending from any of coils pass therethrough, and a bushing inserted in the lead wire insert hole. The bushing includes a body portion arranged to extend in a first direction; a plurality of through holes each of which is arranged to pass through the body portion in the first direction; and a plurality of projecting portions each of which is arranged to extend in the first direction, and project from a lateral surface of the body portion in a direction perpendicular to the first direction. Each through hole includes a cylindrical first hole portion arranged to have an opening on a first side in the first direction; and a second hole portion arranged to have an opening on a second side in the first direction, and to be continuous with the first hole portion, and including a slanting surface arranged to decrease in a diameter toward the first hole portion. A portion of the lead wire is arranged in a corresponding one of the through holes.