Electric Tool Speed Hold Control With Preset Trigger Settings
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Solution Overview
Problem
Existing electric tools with switch triggers for speed control face limitations in maintaining a specific motor operating speed, leading to operator fatigue and reduced efficiency due to manual stroke adjustments, especially during prolonged use.
Innovation Solution
A system and method incorporating a power supply module, motor, controller, inverter, switch fixed-speed module, rotational speed display, and fixed-speed prompting module to automatically set and maintain a target operating speed, using an intelligent fixed-speed mode with visual and auditory feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual switch trigger control is used to adjust motor speed, then the operator can control the speed within a specific range, but the operator experiences physical fatigue and reduced focus during prolonged use
Solution Approach 1:
The system pre-sets multiple fixed speed values (first, second, and third fixed speeds) that correspond to different working conditions. When the electric tool is restarted after power-off, it automatically retrieves and applies the previously set target operating speed, eliminating the need for the operator to manually adjust speed during prolonged use.
Solution Approach 2:
The controller automatically manages the motor speed by retrieving stored target operating speeds and applying them when the tool is restarted. The system serves itself by maintaining speed settings in memory and automatically reapplying them, freeing the operator from continuous manual adjustment.
2Measurement precision
If the operator manually maintains constant switch trigger stroke for specific speed, then the motor operates at the desired speed, but the operating efficiency is significantly reduced during continuous long-term use
Solution Approach 1:
The system pre-configures multiple fixed speed values corresponding to different working conditions. The controller stores these target speeds in memory and automatically retrieves them upon restart, ensuring precise speed control is maintained without requiring continuous operator intervention.
Solution Approach 2:
The system dynamically adapts to different working conditions by providing multiple preset speed levels (first, second, and third fixed speeds). The operator can select appropriate speed levels based on task requirements, and the system maintains these settings automatically during operation and across power cycles.
3Speed
If the switch trigger stroke is continuously adjusted to maintain specific speed, then the motor speed can be kept constant, but the working schedule is delayed due to operator fatigue
Solution Approach 1:
The system pre-sets multiple fixed speed values that correspond to different working conditions. When the electric tool is restarted after power-off, it automatically retrieves and applies the previously set target operating speed, eliminating the need for the operator to manually adjust speed during prolonged use.
Solution Approach 2:
The system incorporates a fixed-speed prompting module that provides feedback to the operator about the current speed setting state. This feedback mechanism helps the operator understand the current operating state without continuous manual adjustment, reducing cognitive load and fatigue during prolonged use.
4Adaptability or versatility
If manual speed control is used, then the operator can adapt speed to different conditions, but the operator becomes less comfortable and less focused during continuous use
Solution Approach 1:
The system dynamically adapts to different working conditions by providing multiple preset speed levels (first, second, and third fixed speeds). The operator can select appropriate speed levels based on task requirements, and the system maintains these settings automatically during operation and across power cycles.
Solution Approach 2:
The system pre-sets multiple fixed speed values that correspond to different working conditions. When the electric tool is restarted after power-off, it automatically retrieves and applies the previously set target operating speed, eliminating the need for the operator to manually adjust speed during prolonged use.
Data Source
AI summary
For a system of adjusting a speed of an electric tool, a power supply module is connected to an inverter, the inverter is connected to a motor and a controller; the controller is connected to a switch fixed-speed module, a rotational speed display module, and a fixed-speed prompting module. The switch fixed-speed module comprises a switch trigger connected to the controller and is configured to set a target operating speed of the motor based on the amount of turned-on stroke of the switch trigger. The rotational speed displaying module is configured to display a preset operating speed of the motor. The fixed-speed prompting module is configured to prompt a setting state of the target operating speed.