Motor Position Deviation Detection for Camera-Guided Motion Control
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Solution Overview
Problem
In motor control systems, when a camera is deviated from its predetermined position due to external forces, the moving part can move from its normal position to a deviated position, leading to inaccuracies in positioning.
Innovation Solution
A motor control system that includes a controller with a first signal processing circuit, a motor control device with a second signal processing circuit, and a position detection device. The system generates an operation command plan for the moving part to reach a target position and calculates a deviation amount based on the detected position and the target position, outputting a notification signal if the deviation exceeds a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the controller generates the operation command of the motor based on the position detected by the camera, then the positioning control is simplified, but the positioning accuracy deteriorates when the camera is deviated from a predetermined position due to external force or the like
Solution Approach 1:
The patent introduces a deviation detection unit as an intermediary component that calculates the deviation amount between the camera-detected position and the actual position. This mediator processes the camera output and generates correction information, allowing the system to maintain simple camera-based control while compensating for camera deviation through the calculated deviation amount.
Solution Approach 2:
The patent implements a feedback mechanism where the deviation detection unit continuously calculates the deviation amount based on camera position detection and feeds this information back to correct positioning errors. The system uses the deviation amount as feedback to adjust the operation commands, ensuring positioning accuracy is maintained despite camera deviation.
2Ease of operation
If the camera moves together with the moving part (mounting head), then the relative position measurement is simplified, but the system cannot detect absolute position deviations caused by camera displacement
Solution Approach 1:
The patent transitions from purely relative position measurement to absolute position detection by introducing a deviation amount calculation that operates in an additional dimension. The deviation detection unit calculates not just relative movement but also absolute deviation from the target position, enabling the system to detect both relative and absolute position information simultaneously.
3Device complexity
If no deviation detection is implemented, then the control system remains simple, but positioning errors cannot be detected or corrected
Solution Approach 1:
The patent applies partial action by implementing deviation detection only for the mounting head position rather than for all moving parts. This selective approach provides sufficient positioning reliability for the critical mounting operation while avoiding the complexity of comprehensive deviation detection across the entire system.
Data Source
AI summary
Motor control system includes controller, motor control device, and position detection device. In controller, an operation command plan for a movement plan during a period until moving part reaches a target position from an initial position is set. Controller outputs, as an operation command, a movement amount of the moving part at a current point in time based on the operation command plan. Motor control device generates a drive signal for drive device based on an operation command Position detection device detects a position of moving part, and outputs a first position. Motor control device generates a deviation amount of moving part from the target position based on a future movement distance of moving part based on a future operation command, the first position, and the target position. Motor control device outputs a notification signal in a case where the deviation amount is more than or equal to a threshold.