Multi-Stage Servo Microactuator Calibration via Simultaneous Voltage Injection
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Solution Overview
Problem
Multi-stage actuated servo systems require efficient calibration methods to ensure predictable and reliable performance, as existing calibration processes are often time-consuming and prone to variations, affecting the accuracy and speed of data access operations in disc storage devices.
Innovation Solution
A method involving simultaneous voltage injections at different frequencies to microactuators within the system, measuring position error signals, and determining gains for each actuator based on these signals to calibrate and normalize their performance, thereby improving the calibration efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sequential calibration methods are used for multi-stage actuated servo systems, then calibration can be performed, but the process is time-consuming and reduces productivity
Solution Approach 1:
The patent combines multiple calibration operations into a single simultaneous process. Multiple voltage injections are applied to different microactuators at the same time, and their position error signals are measured concurrently, allowing parallel calibration of multiple actuators in one operation rather than sequentially, thereby significantly reducing total calibration time.
Solution Approach 2:
The patent employs periodic voltage injections at specific frequencies to excite the microactuators for calibration. By using periodic signals and analyzing the system response at these frequencies, the calibration process achieves rapid and repeatable measurements, improving calibration speed and consistency.
2Measurement precision
If traditional calibration methods are used, then calibration can be completed, but the results are prone to variations and reduce measurement precision
Solution Approach 1:
The patent uses position error signals (PES) as feedback to determine the gains for each microactuator. By measuring the actual position deviation and using this feedback information, the system calculates accurate gain values that compensate for variations, ensuring precise and reliable calibration results.
Solution Approach 2:
The patent changes the frequency parameter of the voltage injections to optimize the calibration process. By selecting appropriate frequencies and analyzing the system response at these frequencies, the method achieves more accurate and consistent gain determinations, reducing variations in calibration results.
3Manufacturing precision
If multiple microactuators are calibrated sequentially, then each actuator can be calibrated individually, but the overall calibration process becomes time-consuming
Solution Approach 1:
The patent merges the calibration of multiple microactuators into a single simultaneous operation. Multiple voltage injections are applied to different microactuators at the same time, and their position error signals are measured concurrently, allowing parallel calibration of multiple actuators in one operation rather than sequentially, thereby significantly reducing total calibration time while maintaining precision.
Solution Approach 2:
The patent segments the calibration process into independent parallel operations. Each microactuator receives its own voltage injection and has its own position error signal measured independently, allowing simultaneous calibration of multiple actuators without interfering with each other, thus improving throughput while maintaining individual actuator calibration precision.
Data Source
AI summary
Systems and methods are disclosed for calibrating actuators in a multi-stage servo system. In certain embodiments, a method may comprise performing a calibration process on a multi-stage actuated servo system, including simultaneously injecting voltage injections into multiple microactuators of the servo system, measuring a resulting position error signal (PES), and determining gain settings for each of the multiple microactuators based on the PES. Multiple microactuators can therefore be calibrated during a single-injection calibration operation.