Power Tool Free-Fall Detection With Automatic Motor Braking
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Solution Overview
Problem
Existing power tools lack effective mechanisms to safely shut down during a free fall, which can lead to damage or accidents.
Innovation Solution
The integration of a sensor and controller system within the power tool that detects free falls and automatically brakes the motor to prevent further operation during a drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor and controller system is integrated to detect free falls and brake the motor, then safety and damage prevention are improved, but device complexity increases
Solution Approach 1:
The system is divided into distinct functional modules: a sensor module for detecting free fall conditions, a controller module for processing sensor signals and determining drop events, and a motor module for executing braking actions. This segmentation allows each component to be optimized independently while maintaining overall system reliability without excessive complexity.
2Reliability
If the motor is braked immediately upon detecting free fall, then damage prevention is improved, but the power tool may shut down during normal operation if the threshold is too sensitive
Solution Approach 1:
The controller is configured to detect free fall events and determine whether they constitute actual drops before initiating motor braking. This preliminary detection and evaluation step allows the system to prepare for potential damage scenarios while filtering out normal operational movements, ensuring the motor is braked only when genuinely necessary to prevent damage.
3Ease of operation
If the system monitors the duration of free fall to distinguish drops from normal operation, then false shutdowns are reduced, but response time during actual drops increases
Solution Approach 1:
The controller monitors the duration of free fall events and compares them against predetermined time thresholds. By implementing this time-based filtering, the system achieves partial protection against false shutdowns while maintaining adequate response time for actual drop events. The threshold is calibrated to filter out normal operational movements that are too brief to represent dangerous drops.
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 effectively prevents damage and ensures user safety by ensuring the power tool shuts down promptly during a free fall, regardless of the duration of the fall.
Implementation Method 1
The sensor is configured to sense a free fall of the power tool and generate an output signal related to the sensed free fall
Data Source
AI summary
A power tool comprising a power tool housing and a motor within the power tool housing. The motor including a rotor and a stator, the rotor coupled to a motor shaft to produce a rotational output. The power tool further includes a sensor within the power tool housing, the sensor configured to sense a free fall of the power tool, generate an output signal related to the sensed free fall. The power tool further includes a controller including a processor and a memory, the controller configured to receive the output signal from the sensor, detect the free fall of the power tool based on the output signal from the sensor, and brake the motor when the free fall of the power tool is detected.