Electric Working Machine Motor Control for Dynamic Load Adaptation
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Solution Overview
Problem
Conventional electric working machines are unable to dynamically adjust the control variables for high speed rotation of a motor based on the situation in the motor, leading to inefficiencies in tasks such as fastening screws, especially when a large load is applied during low speed rotation.
Innovation Solution
An electric working machine with a controller and setter that initiates low speed rotation and dynamically adjusts the control variables, such as rotational frequency and conduction parameters, based on the load conditions, allowing for an optimal transition to high speed rotation when a preset condition is met, thereby improving usability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the number of impact and control variables are preset in advance, then the device complexity is reduced and ease of operation is improved, but the adaptability to different load conditions deteriorates
Solution Approach 1:
The patent applies dynamics by making the control variables (number of impacts, rotational frequency, duty ratio) changeable rather than fixed. The control unit dynamically adjusts these parameters based on detected load conditions during operation, allowing the system to adapt between low speed rotation and high speed rotation modes while maintaining ease of operation through automatic control.
Solution Approach 2:
The patent implements parameter changes by modifying control variables (number of impacts, rotational frequency, duty ratio) based on detected load conditions. The control unit changes these parameters automatically according to the operational state, enabling the system to adapt to different load conditions without requiring manual intervention from the user.
2Productivity
If the rotational state is changed from low speed to high speed rotation, then the productivity is improved, but the reliability deteriorates due to potential screw disengagement
Solution Approach 1:
The patent applies feedback by using the control unit to detect load conditions during operation and automatically adjust the rotational frequency and number of impacts accordingly. This feedback mechanism ensures that the transition from low speed to high speed rotation occurs at the optimal moment, maintaining screw engagement reliability while maximizing productivity.
Solution Approach 2:
The patent implements preliminary action by performing low speed rotation with a predetermined number of impacts before transitioning to high speed rotation. This preliminary phase ensures proper screw engagement and positioning, creating favorable conditions for the subsequent high speed rotation phase and preventing disengagement issues.
3Manufacturing precision
If the number of impact is increased for large load conditions, then the manufacturing precision is improved, but the loss of time increases
Solution Approach 1:
The patent applies dynamics by making the number of impacts a variable parameter that changes based on detected load conditions. For large loads, the control unit increases the number of impacts to ensure proper fastening precision, while for small loads, it reduces the number of impacts to minimize cycle time, thus optimizing both precision and time efficiency dynamically.
Solution Approach 2:
The patent implements parameter changes by adjusting the number of impacts according to load conditions detected by the control unit. This dynamic parameter adjustment allows the system to achieve manufacturing precision when needed (high loads) while reducing time loss when possible (low loads), resolving the contradiction between precision and time efficiency.
Data Source
AI summary
An electric working machine in one aspect of the present disclosure includes a motor, a controller, and a setter. The controller is configured to change a rotational state of the motor, in response to an establishment of a condition for change after the motor is initiated, from a low speed rotation to a high speed rotation. The setter is configured to set, based on a situation in the motor in the low speed rotation, a control variable of the motor in the high speed rotation and/or the condition for change.