Twisted Motion Detection in Electric Working Machines
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Solution Overview
Problem
Existing electric working machines inaccurately detect twisted motion due to variations in rotational speed caused by gear ratios and load changes, leading to potential safety issues and operational inefficiencies.
Innovation Solution
The electric working machine incorporates a reference level changer that adjusts based on rotating motion, manual operation, and load detection, using an acceleration detector and twisted motion detector to accurately identify twisted motion, and a motor controller that stops the motor in response, ensuring safety and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acceleration detector is used to detect twisted motion, then the detection capability is provided, but inaccurate detection occurs due to rotational speed variations
Solution Approach 1:
The reference level is made dynamic by adjusting it according to the rotational speed of the output shaft. The reference level changer modifies the reference level based on the detected rotational speed, allowing the twisted motion detection system to adapt to varying operational conditions and maintain accuracy across different speeds.
Solution Approach 2:
The system changes the reference level parameter based on rotational speed variations. By dynamically adjusting this parameter, the system compensates for the effects of varying rotational speed on acceleration detection, thereby maintaining accurate twisted motion detection across different operating conditions.
2Measurement precision
If the reference level is fixed, then the detection system is simple, but inaccurate detection occurs when rotational speed changes
Solution Approach 1:
The reference level is transformed from a fixed value to a dynamic value that automatically adjusts with rotational speed. This dynamic adaptation enables accurate detection without requiring complex manual calibration or multiple detection systems for different speed ranges.
Solution Approach 2:
The system implements a feedback mechanism where the rotational speed detection result is fed back to the reference level changer, which then adjusts the reference level accordingly. This closed-loop control ensures continuous accurate detection while maintaining relatively simple system architecture.
3Productivity
If the motor continues to operate during twisted motion, then productivity is maintained, but safety risks increase
Solution Approach 1:
The motor controller receives feedback from the twisted motion detector and automatically stops motor operation when twisted motion is detected. This safety mechanism prevents harmful effects while allowing continuous operation under normal conditions, thereby maintaining productivity when safe and ensuring user safety when needed.
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 solution enables accurate detection of twisted motion regardless of changes in rotational speed or load, preventing unnecessary motor operation and enhancing user safety and operational reliability.
Implementation Method 1
The acceleration detector detects an acceleration imposed on the housing in the circumferential direction
Data Source
AI summary
An electric working machine in one aspect of the present disclosure includes an output shaft, a motor, a housing, an acceleration detector, a twisted motion detector, a reference level changer, and a motor controller. The acceleration detector detects an acceleration of the housing in a circumferential direction of the output shaft. The twisted motion detector detects a twisted motion of the housing based on a reference level and the acceleration detected. The reference level determines that the housing is twisted. The reference level changer changes the reference level based on a rotating motion of the output shaft.