Spindle Motor Base Portion Recessed Lead Wire Routing

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Solution Overview

Problem

Conventional spindle motor designs that shave the bottom surface for lead wire connections compromise the rigidity of the motor bracket, leading to a reduction in thickness and structural integrity.

Innovation Solution

The design incorporates a base portion with through holes and recessed portions to accommodate lead wires, allowing for reduced shaving while maintaining sufficient rigidity, and uses a sealant to secure the lead wires and prevent electrical connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the bottom surface of the motor bracket is shaved to accommodate lead wire connections, then the electrical connection is achieved, but the rigidity of the motor bracket is reduced

Engineering Contradiction:

Improveelectrical connectionVSAvoidrigidity of motor bracket

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The base portion is designed with localized recessed portions only at the specific locations where lead wires need to pass through, rather than shaving the entire bottom surface. This localized modification maintains the rigidity of the motor bracket while achieving the necessary electrical connections.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of removing material horizontally from the bottom surface, the invention creates vertical recessed portions that extend downward from the bottom surface. This dimensional change allows lead wires to pass through while preserving the overall structural integrity and rigidity of the base portion.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If a large area of the bottom surface is shaved to accommodate circuit board adhesion and soldering, then the electrical connection is secured, but the thickness and structural integrity of the base portion is compromised

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidthickness of base portion

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The recessed portions are created only at the specific locations where lead wires need to exit the base portion, rather than shaving a large area. This localized approach maintains the thickness and structural integrity of the base portion while ensuring reliable electrical connections through the lead wires.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The base portion is segmented with multiple discrete recessed portions at different locations, each accommodating specific lead wires. This segmentation allows for precise material removal only where needed, preserving the overall thickness and structural integrity of the base portion.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8416524B2Spindle motor having connecting mechanism connecting lead wire and circuit board, and storage disk drive having the same

Publication Date: 2013.04.09 NIDEC CORP(JP)

AI summary

A spindle motor includes a base portion, a rotor hub, a stator, and a circuit board. The base portion preferably includes a through hole and is arranged to spread out radially around a central axis. The rotor hub is arranged above the base portion to rotate about the central axis. The stator is arranged above the base portion, and includes coils each including at least one lead wire. The circuit board is arranged radially outward of the through hole, and arranged on a lower surface of the base portion. The base portion includes a communicating groove arranged to join the through hole and the circuit board to each other. The at least one lead wire of the coils is arranged to pass inside the through hole and the communicating groove to be electrically connected to the circuit board. The through hole is sealed with a sealant.