Vibration Sensor Feedforward Control for Magnetic Storage Positioning
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Solution Overview
Problem
Conventional magnetic storage devices face challenges in accurately controlling the position of actuatable components due to vibrations, which conventional feedback control techniques struggle to adequately compensate for, leading to position errors.
Innovation Solution
The implementation of a magnetic storage device with a sensor feedforward controller that detects vibrations using sensors like force, acceleration, or strain sensors, generating a gain signal to modify the actuator command signal, thereby reducing position errors caused by vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional feedback control techniques are used to reduce position errors, then the control system remains simple, but the position errors caused by vibration cannot be adequately compensated
Solution Approach 1:
The vibration sensor detects vibrations before they cause significant position errors, and the feedforward controller generates compensatory signals in advance to counteract the expected position deviations. This preliminary action allows the system to compensate for vibration effects proactively rather than reactively, improving position accuracy without requiring complex feedback mechanisms.
Solution Approach 2:
A vibration sensor and feedforward controller are introduced as intermediary components between the actuator and the position error. The vibration sensor detects vibration characteristics, and the feedforward controller processes this information to generate compensatory signals that are added to the actuator command signals, thereby mediating the effect of vibrations on position accuracy.
2Manufacturing precision
If feedforward control with vibration sensors is implemented, then position errors of higher order are reduced, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical vibration isolation systems with an electronic feedforward control system. Instead of using heavy mechanical dampers or isolation mechanisms, the invention uses vibration sensors to detect vibrations and electronic controllers to generate compensatory signals, achieving high positioning accuracy through signal processing rather than mechanical means.
Solution Approach 2:
The feedforward controller changes the parameters of the actuator command signals based on detected vibration characteristics. By dynamically adjusting signal parameters (amplitude, phase, frequency) in response to detected vibrations, the system compensates for position errors without requiring additional mechanical components, thereby improving positioning accuracy with minimal increase in device complexity.
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 effectively reduces position errors of higher order than traditional feedback control systems, improving the positioning accuracy and reliability of actuatable components within the magnetic storage device.
Implementation Method 1
a vibration sensor, located in the interior cavity and configured to detect a vibration of the cover
Implementation Method 2
The vibration sensor is a force sensor. The force sensor is interposed between the cover and the flex bracket
Implementation Method 3
The vibration sensor is an acceleration sensor
Implementation Method 4
The vibration sensor is a strain sensor fixed to the flex bracket such that the strain sensor does not move relative to the flex bracket
Data Source
AI summary
A magnetic storage device that includes a housing, including a base, a cover, and an interior cavity. The magnetic storage device also includes an actuator controller, located in the interior cavity and configured to generate an actuator command signal. The magnetic storage device further includes an actuatable component, located in the interior cavity, and an actuator, located in the interior cavity and operable to actuate the actuatable component in response to the actuator command signal. The magnetic storage device also includes a vibration sensor, located in the interior cavity and configured to detect a vibration of the cover. The magnetic storage device further includes a sensor feedforward controller, located in the interior cavity and configured to generate a gain signal, based on the vibration of the cover detected by the vibration sensor, and to modify the actuator command signal proportional to the gain signal.