Disk Drive Actuator Dynamic Coast Velocity Control
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Solution Overview
Problem
Existing disk drive systems do not achieve optimal seek performance in terms of power consumption and settling due to preconfigured seek profiles, which do not adapt effectively to measured head velocities and deceleration parameters during seek operations.
Innovation Solution
The control circuitry in the disk drive system recursively adjusts the coast velocity of the seek profile based on measured head velocity, deceleration distance, and deceleration time, generating actuator control signals to optimize the seek operation by dynamically updating the coast velocity until convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If preconfigured seek profiles are used, then the seek operation can be executed with a predetermined coast velocity, but the power consumption and settling performance cannot be optimized due to lack of adaptation to measured head velocities and deceleration parameters
Solution Approach 1:
The patent applies dynamics by transitioning from a static preconfigured seek profile to a dynamic adaptive seek profile. The coast velocity is continuously updated during the seek operation based on measured head velocity and deceleration parameters, allowing the system to adapt in real-time to actual operating conditions. This dynamic adjustment optimizes power consumption while maintaining seek efficiency.
Solution Approach 2:
The patent implements feedback by measuring the actual head velocity and deceleration parameters during the seek operation, then using this measured information to recursively update the coast velocity. This closed-loop feedback mechanism enables the system to optimize power consumption based on actual system performance rather than relying on predetermined values.
2Manufacturing precision
If preconfigured seek profiles with fixed coast velocity are used, then the control system is simpler to implement, but the settling accuracy and seek performance are suboptimal due to inability to adapt to measured deceleration parameters
Solution Approach 1:
The patent uses feedback to measure actual head velocity and deceleration parameters, then recursively updates the coast velocity to optimize settling accuracy. This feedback mechanism improves precision without requiring complex hardware modifications, as it leverages existing measurement capabilities.
Solution Approach 2:
The patent changes the coast velocity parameter dynamically during the seek operation based on measured deceleration parameters. By adjusting this key parameter in real-time, the system achieves improved settling accuracy without fundamentally changing the control system architecture.
3Use of energy by moving object
If the coast velocity is updated recursively based on measured velocity and deceleration parameters, then power consumption is reduced and settling accuracy is improved, but the control algorithm becomes more complex
Solution Approach 1:
The recursive update algorithm uses feedback from measured velocity and deceleration parameters to continuously optimize the coast velocity. This feedback-driven approach reduces power consumption by adapting to actual system conditions rather than using fixed predetermined values.
Solution Approach 2:
The control algorithm performs self-service by using its own measurements of velocity and deceleration to automatically adjust the coast velocity without requiring external intervention or complex external control systems. The system optimizes itself based on its own operational data.
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 approach enhances seek performance by reducing power consumption and improving settling accuracy, as the coast velocity is adjusted in real-time to match the target velocity, leading to more efficient and precise track positioning.
Implementation Method 1
a head connected to a distal end of an actuator arm which is rotated about a pivot by a voice coil motor (VCM)
Data Source
AI summary
A data storage device is disclosed comprising a disk comprising a plurality of tracks, and an actuator configured to actuate a head over the disk. While seeking the head from a first track toward a second track, a velocity of the head over the disk is measured, and a deceleration distance and a deceleration time is generated based on the measured velocity. A coast velocity is generated based on the measured velocity, the deceleration distance, and the deceleration time, and a control signal applied to the actuator is adjusted based on the measured velocity and the coast velocity.