Drill Motor Speed Ramp for Easy Hole Start Control
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Solution Overview
Problem
Conventional drilling power tools can lose user control when a motor outputs high torque upon trigger actuation, leading to difficulties in managing drilling power.
Innovation Solution
A power tool system with a motor, battery pack interface, actuator, and electronic controller that detects actuator activation, drives the motor at a first speed, gradually increases speed to a target speed, and turns off the tool if the target speed is not reached within a predetermined time, incorporating an easy hole start mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor outputs high torque upon trigger actuation, then the drilling power is sufficient, but the user loses control of the power tool
Solution Approach 1:
The system performs preliminary action by initially driving the motor at a first (lower) speed when the actuator is actuated, rather than immediately applying full power. This preliminary low-speed phase allows the user to establish control and position the tool before full drilling power is applied, preventing loss of control while still enabling sufficient drilling capability when needed.
Solution Approach 2:
The system applies dynamics by continuously adjusting the motor speed from a first speed to a second speed based on operational conditions. The motor controller dynamically increases the motor speed from the initial lower speed to a higher second speed, allowing the system to adapt between user control requirements and drilling power requirements at different operational phases.
2Ease of operation
If the motor speed is gradually increased from first speed to second speed, then user control is maintained, but the time to reach operational speed increases
Solution Approach 1:
The system applies partial action by initially driving the motor at a first speed that is lower than the full operational second speed. This partial power application is sufficient for the initial control phase but not excessive, allowing smooth transition to full power when needed. The motor controller then increases speed to the second level, providing full drilling capability when the user requires it, balancing control and time efficiency.
Data Source
AI summary
A power tool, such as a drilling power tool, configured to perform an easy hole start operation upon actuation of a trigger. When the trigger is actuated, the motor is driven at a low speed value. The motor speed is increased to a second speed value during a predetermined time threshold and then driven at the second speed value until the trigger is no longer actuated. In some embodiments, the easy hole start operation may be implemented by an easy hole start switch. In some embodiments, if the easy hole start operation persists for a time greater than a predetermined time threshold, then the motor will shut off.