Electric Working Machine Motor Control Trigger Manipulation
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Solution Overview
Problem
Users of electric power tools experience finger fatigue due to the need to fully pull a trigger to achieve maximum motor rotational speed, especially in applications like bolt tightening, where continuous high-speed operation is required.
Innovation Solution
An electric working machine with a controller that allows the motor to reach maximum rotational speed with minimal trigger manipulation by setting control characteristics to achieve maximum speed within 50% or less of the trigger's effective range, and includes modes like Bolt mode for efficient high-speed operation without excessive trigger pull, and screw-tightening mode for adjustable rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If control characteristics are set to achieve maximum motor rotational speed with full trigger pull, then the motor can reach maximum speed, but the user experiences finger fatigue due to frequent full trigger manipulation
Solution Approach 1:
The patent changes the control characteristic parameters by introducing multiple predefined modes (first through fifth modes) that map different trigger manipulation ranges to maximum motor speeds. Instead of a single linear mapping, the system uses mode-specific parameters where each mode defines a unique relationship between trigger position and motor speed, allowing optimization for different operational requirements.
Solution Approach 2:
The system dynamically switches between different control characteristic modes based on operational needs. The controller can transition between first through fifth modes, each with distinct speed-manipulation relationships, enabling adaptive response to varying work conditions rather than relying on a fixed control characteristic.
2Ease of operation
If control characteristics are set to achieve maximum motor rotational speed within 50% or less of effective manipulating range, then maximum speed is reached with minimal trigger manipulation, but the manipulating range for speed adjustment is reduced
Solution Approach 1:
The patent segments the speed control range into multiple distinct modes (first through fifth modes), each handling a specific operational scenario. This segmentation allows each mode to be optimized for its particular use case, with some modes achieving maximum speed at minimal trigger manipulation while others provide broader adjustment ranges, collectively covering the full spectrum of operational needs.
Solution Approach 2:
The control system achieves multi-functionality by incorporating five different control modes within a single system. Each mode serves a specific function (e.g., rapid acceleration, fine control, maximum power), and the universal controller can switch between them, allowing the system to adapt to various operational requirements without needing separate devices.
Data Source
AI summary
An electric working machine in one aspect of the present disclosure includes: a motor, a manipulator, a setter, and a controller. The setter sets first control characteristics preliminarily registered. The first control characteristics are set to achieve a rotational speed of the motor from a minimum rotational speed to a maximum rotational speed with a manipulating range of the manipulator, which is 50% or less of an effective manipulating range thereof.