Material Removal Motion Control Using Actuator Current Feedback
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Solution Overview
Problem
Conventional material removal machines lack precise movement control, leading to imprecise and crude movement, especially when transitioning from a non-contact to a contact position with a sample, due to ineffective indicators like belt tension and associated issues with signal delay and noise.
Innovation Solution
The implementation of control circuitry that monitors the current drawn by a tool actuator to determine contact or non-contact positions, adjusting movement speed and force accordingly, using power sensors integrated into the controller to enhance precision and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional material removal machines use stationary or hand-manipulated configurations, then the machine structure is simple, but the movement precision and control accuracy deteriorate
Solution Approach 1:
The patent replaces mechanical indicators (belt tension) with electrical/electronic indicators (current drawn by tool actuator, power sensor signals) to detect contact status. This substitution enables more precise movement control through electronic feedback while maintaining manageable system complexity through integrated control circuitry.
2Manufacturing precision
If material removal machines use machine assemblies for movement, then the movement capability is improved, but the control precision deteriorates due to crude and imprecise control
Solution Approach 1:
The patent implements a feedback control system where the control circuitry continuously monitors current drawn by the tool actuator and power sensor readings, then adjusts movement control in real-time based on this feedback. This enables precise control during transitions between non-contact and contact positions, directly improving both control precision and responsiveness.
3Measurement precision
If belt tension is used as an indicator for contact status, then the detection mechanism is simple, but the measurement accuracy deteriorates due to signal delay and noise
Solution Approach 1:
The patent replaces the mechanical belt tension indication system with an electrical measurement system using power sensors and current monitoring. This substitution eliminates mechanical signal delays and noise, providing immediate and accurate detection of contact status through electrical parameters, thereby improving measurement precision without time loss.
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 allows for more precise and responsive movement control, improving the material removal process by accurately determining contact status and adjusting movement parameters, reducing issues related to belt tension and signal delays.
Implementation Method 1
control circuitry configured to monitor a current drawn by the tool actuator
Data Source
AI summary
A material removal system may control movement of a material removal machine based on whether a material removal tool is in contact with a sample. A material removal system may include a material removal machine (e.g., saw, grinder, polisher, and/or more general material preparation and/or testing machine) that is configured to move at the urging of one or more actuators. The system may further include control circuitry configured to control movement (and/or speed, acceleration, etc.) of the material removal machine (e.g., via the actuators) based on one or more power, thermal, position, and/or other parameters that indicate whether the material removal tool of the material removal machine is in contact with a sample.