Electromechanical Apparatus Dynamic Stop Position Targeting
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Solution Overview
Problem
Electromechanical apparatuses face challenges in suppressing sound during quick stops, as existing methods require feedback control and may generate noise due to rapid rotation before actual stoppage, which is undesirable in quiet environments.
Innovation Solution
An electromechanical apparatus with a motor and rotation sensor system that controls the rotation shaft by adjusting the stop position target stepwise based on detected angular positions, reducing rotation and sound during the stopping process without feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a quick stop is implemented within a short moving distance, then the stopping time is reduced, but collision sounds are generated by members such as gears
Solution Approach 1:
The stop position target is dynamically adjusted based on the detected angular position of the rotation shaft. When the shaft exceeds the target position by a predetermined amount, the target is moved to an intermediate position between the original target and current position, creating a dynamic stopping strategy that adapts to real-time motion state to reduce collision sounds while maintaining quick stopping
Solution Approach 2:
The angular position parameter of the stop position target is changed during the stopping process. By shifting the target position from the original stop position to an intermediate position when overshoot is detected, the system modifies the stopping parameters to minimize harmful collision sounds while achieving rapid deceleration
2Stability of the object's composition
If feedback control is used to maintain torque below a limit value, then oscillation is suppressed, but rotation continues to some extent after stop operation starts
Solution Approach 1:
The patent replaces traditional feedback control mechanisms with an open-loop position adjustment strategy. Instead of continuously monitoring and adjusting torque based on feedback, the system preemptively shifts the stop position target based on detected angular position, eliminating the need for continuous feedback control and reducing rotation during the stopping phase
3Device complexity
If the stop position target is fixed, then control is simple, but the rotation shaft may overshoot and generate collision sounds
Solution Approach 1:
The stop position target transitions from a fixed value to a dynamically adjustable parameter. The control system detects the angular position of the rotation shaft and automatically shifts the target position when overshoot conditions are met, providing a simple yet effective solution that prevents collision sounds without complex control mechanisms
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
Effectively reduces noise during stopping by moving the stop position target stepwise, ensuring accurate stopping and minimizing rotation from the start to the end of the stop operation, thus suppressing sound and maintaining high accuracy.
Implementation Method 1
a motor that includes a rotation shaft and that applies to the rotation shaft a torque in a direction toward an angular position in accordance with control
Implementation Method 2
a rotation sensor detecting an angular position of the rotation shaft
Data Source
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AI summary
An electromechanical apparatus (100) includes: a motor (130) that includes a rotation shaft (132) and that applies to the rotation shaft (132) a torque in a direction toward an angular position in accordance with control; a rotation sensor (134) detecting an angular position of the rotation shaft (132); and a motor control unit (181) controlling rotation of the rotation shaft by switching an angular position to which the rotation shaft (132) rotates in accordance with an angular position detected by the rotation sensor (134). The motor control unit (181), in a case where the rotation shaft (132) is to be stopped, after applying a torque in a direction toward an angular position of a stop position target to the rotation shaft (132) and when the angular position detected by the rotation sensor (134) exceeds an angular position of the stop position target by a predetermined amount, moves the angular position of the stop position target to an angular position between the angular position of the stop position target and the angular position detected by the rotation sensor (134).