Spindle Motor Timing Variation Correction
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Solution Overview
Problem
Existing disk drive systems face challenges in maintaining consistent spindle motor speed due to external disturbances and repeatable timing run-out (RTRO), which affect the accuracy of data storage and retrieval operations.
Innovation Solution
A method is introduced to predict and correct timing variations using a computational model, determining a repetitive error correction factor to compensate for RTRO, ensuring consistent spindle motor speed and improved data storage accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a spindle motor control system is used to maintain operational speed, then speed stability is improved, but timing variations due to RTRO still affect positioning accuracy
Solution Approach 1:
The patent applies preliminary action by predicting timing variations due to RTRO before they affect positioning operations. A computational model predicts the RTRO timing variations, and correction factors are calculated in advance to compensate for these variations, thereby maintaining positioning accuracy despite speed stability limitations
Solution Approach 2:
The patent implements feedback by using a computational model that continuously predicts timing variations and adjusts correction factors accordingly. The system monitors actual timing mark intervals, compares them with predicted values, and updates correction factors to minimize positioning errors caused by RTRO
2Measurement precision
If computational modeling is used to predict and correct timing variations, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The patent replaces complex mechanical timing correction mechanisms with a computational approach. Instead of using additional mechanical components to physically adjust timing, the system uses a computational model to predict variations and applies software-based correction factors to compensate for RTRO, thereby improving accuracy without proportionally increasing mechanical complexity
Data Source
AI summary
Methods, systems and computer program products for compensating repeatable timing variations associated with a spindle motor are described. Specifically, a repetitive error correction factor may be determined using a computational model which predicts timing variations. The correction factor can then be used to cancel the effect of the actual timing variations upon the spindle motor.