Dynamic Gain Control for Drive Mechanism Current Regulation
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Solution Overview
Problem
Conventional surface texture measuring apparatuses face insufficient control performance due to constant proportional and integral gain settings, which do not adapt to changes in drive speed, leading to suboptimal control during varying drive states.
Innovation Solution
A three-dimensional measuring machine with a drive control circuit that includes an electric-current gain control circuit, which adjusts integral and proportional gains based on the drive speed of the drive mechanism, allowing for optimal control performance across different drive modes by setting specific gain values for stopping, high-speed movement, and measurement states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant proportional and integral gain values are set in the PI circuit, then the control circuit configuration is simple and easy to manufacture, but control performance becomes insufficient when drive speed changes
Solution Approach 1:
The patent applies dynamics by making the gain values dynamic rather than constant. The proportional gain and integral gain are automatically adjusted based on the actual drive speed of the drive mechanism. When drive speed changes, the gain values change accordingly, allowing the control circuit to maintain optimal control performance across different operating conditions without requiring a complex multi-circuit configuration
Solution Approach 2:
The patent changes the parameters (gain values) of the existing PI circuit based on drive speed conditions. By detecting the actual drive speed and selecting appropriate proportional and integral gain values from predefined sets, the system optimizes control performance for different operating states (high-speed driving, low-speed driving, stopping) without fundamentally changing the circuit structure
2Speed
If gain values are optimized for high-speed driving, then responsiveness is improved, but control performance deteriorates during low-speed driving and stopping
Solution Approach 1:
The patent changes the proportional and integral gain parameters based on drive speed conditions. Multiple sets of gain values are predefined: first proportional/integral gains for high-speed driving, second proportional/integral gains for low-speed driving, and third proportional/integral gains for stopping. The system automatically selects the appropriate gain set based on actual drive speed, ensuring optimal control performance across all operating conditions
Solution Approach 2:
The patent makes the control system dynamic by continuously monitoring drive speed and adjusting gain values in real-time. This dynamic adaptation allows the system to maintain high responsiveness during high-speed driving while also achieving stable control during low-speed driving and stopping, eliminating the trade-off between speed and control accuracy
3Measurement precision
If gain values are optimized for low-speed driving, then control precision is improved, but responsiveness deteriorates during high-speed driving
Solution Approach 1:
The patent implements parameter changes by selecting different proportional and integral gain values based on drive speed. When drive speed is low, the system uses gain values optimized for precision control. When drive speed is high, the system switches to gain values optimized for responsiveness. This conditional parameter adjustment ensures both high-speed responsiveness and low-speed precision are achieved at different times
Data Source
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AI summary
A control apparatus for controllably driving a drive mechanism (25) which displaces a movable member (211), includes: an electric-current detecting unit (27) configured to detect electric current for driving the drive mechanism; a speed control unit (32) configured to set a target eleetric-eurrent according to a drive speed at which the drive mechanism (25) is caused to drive the movable member (211); and an electric-current control unit (333) configured to multiply, by an integral gain and a proportional gain, an electric-current deviation between a target electric-current and a detection electric-current detected by the electric-current detecting unit to set output electric-current to be output to the drive mechanism, wherein the current control unit changes at least one of the integral gain and the proportional gain according to the drive speed of the drive mechanism.