Spindle Motor Suction Magnet Curvature Alignment

Solution Overview

Problem

Conventional spindle motors experience uneven suction force due to the curvature in the bearing housing, leading to axial movement of the rotation shaft, which affects rotational performance and stability.

Innovation Solution

The spindle motor design includes a bearing housing with a core fixture and a suction magnet arranged on the external side of the curvature, ensuring even suction force distribution and preventing core separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the suction magnet is disposed at a portion bent to have the curvature in the bearing housing, then the core is secured at the periphery of the bearing housing, but the suction force becomes unevenly formed causing the rotation shaft to move along the axis of the rotation shaft

Engineering Contradiction:

Improvecurvature shape of bearing housingVSAvoidrotational stability

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The suction magnet is designed with a specific shape that corresponds to the curvature of the bearing housing, creating a localized quality match between the magnet's surface and the housing's curved surface. This ensures uniform contact and even suction force distribution across the curved interface, preventing axial movement of the rotation shaft while maintaining the necessary curvature for core retention.

Inventive Principle:

Principle #3Local quality

2Shape

If the suction magnet is disposed at a portion bent to have the curvature in the bearing housing, then the core is secured at the periphery of the bearing housing, but the suction force becomes unevenly formed causing the rotation shaft to move along the axis of the rotation shaft

Engineering Contradiction:

Improvecurvature shape of bearing housingVSAvoidsuction force uniformity

Core Design Contradiction:

ShapeVSForce

Solution Approach 1:

The suction magnet is designed with a specific shape that corresponds to the curvature of the bearing housing, creating a localized quality match between the magnet's surface and the housing's curved surface. This ensures uniform contact and even suction force distribution across the curved interface, preventing axial movement of the rotation shaft while maintaining the necessary curvature for core retention.

Inventive Principle:

Principle #3Local quality

3Shape

If the suction magnet is disposed at a portion bent to have the curvature in the bearing housing, then the core is secured at the periphery of the bearing housing, but the suction force becomes unevenly formed causing the rotation shaft to move along the axis of the rotation shaft

Engineering Contradiction:

Improvecurvature shape of bearing housingVSAvoidrotational performance

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

The suction magnet is designed with a specific shape that corresponds to the curvature of the bearing housing, creating a localized quality match between the magnet's surface and the housing's curved surface. This ensures uniform contact and even suction force distribution across the curved interface, preventing axial movement of the rotation shaft while maintaining the necessary curvature for core retention.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enhances rotational stability and performance by maintaining the rotation shaft's axial alignment, reducing data reading errors in optical disk drives.

Implementation Method 1

a suction magnet mounted to the yoke to generate a suction force sucking the bearing housing

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS8878405B2Spindle motor

Publication Date: 2014.11.04 HITACHI LG DATA STORAGE KOREA INC

AI summary

A spindle motor is provided, the motor including a bearing assembly including an upper surface-opened cylindrical bearing housing and a bearing accommodated in the bearing housing and formed with a rotation shaft hole; a stator including a core coupled to a periphery of the bearing housing and a coil wound on the core; a rotation shaft inserted into the rotation shaft hole; a rotor including a disk-shaped yoke coupled to the rotation shaft and a magnet coupled to the yoke to face the core; and a suction magnet arranged at the yoke facing the core, wherein the bearing housing includes a body coupled to the core and a core fixture bent from the body to face the core, and the suction magnet is so arranged as to face the core fixture corresponding to an external side of a bent unit bent from the body for forming the core fixture.