Yoke Flange Motor Structure for Low-Vibration Disk Drives
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Solution Overview
Problem
Conventional disk drive devices face challenges in increasing data capacity while minimizing vibration and noise, as deeper annular recesses for more disks reduce base portion thickness, leading to potential deformation and rigidity issues with the flange portion.
Innovation Solution
The design includes a motor with a rotor flange portion having a yoke flange portion that reduces axial thickness while maintaining rigidity, and a base portion with increased thickness and rib structures to enhance rigidity and reduce vibration and noise, supported by a rotor with a hub flange portion and yoke tube configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the annular recess is made deeper to accommodate more disks, then the number of disks that can be mounted increases, but the base portion thickness becomes thinner leading to increased vibration and noise
Solution Approach 1:
The patent applies local quality by creating a localized reinforcement structure (protrusion) at the specific location where the base portion is thinned due to the deep annular recess. This protrusion is positioned at the radially outer side of the base portion to compensate for the reduced thickness in that specific area, thereby maintaining overall rigidity while allowing the recess to be deep enough for multiple disks.
2Length of moving object
If the flange portion is made thinner to reduce axial thickness, then the overall motor height is reduced, but the deformation resistance during disk clamping decreases
Solution Approach 1:
The flange portion is segmented into the main radial flange structure and the axial protrusion. The main flange remains thin for reduced overall height, while the protrusion provides the necessary structural support and deformation resistance during disk clamping operations.
Solution Approach 2:
The protrusion acts as an intermediary structural element between the thin base portion and the external environment. It provides the necessary rigidity and support during disk mounting without requiring the main flange portion to be thicker, thus maintaining the reduced axial thickness while ensuring adequate deformation resistance.
Data Source
AI summary
A motor includes a shaft, a base portion, a stator, and a rotor. The shaft extends along a central axis extending in an axial direction. The base portion extends in a radial direction on one axial direction side of the shaft. The stator is located in another axial direction with respect to the base portion and surrounds the shaft. The rotor is rotatable around the central axis. The rotor includes a rotor tube portion, a magnet, and a rotor flange portion. The rotor tube portion surrounds the stator. The magnet is opposed to the stator in the radial direction. The rotor flange portion extends in a radially outer direction from one axial end portion of the rotor tube portion. The rotor tube portion includes a yoke tube portion and a hub tube portion. The yoke tube portion is located on a radially inside surface of the hub tube portion.