Flywheel Power Tool Control for Pickup Motion Spin-Up
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Solution Overview
Problem
Traditional power tools, particularly cordless nailers with flywheels, experience a significant motor spin-up delay before reaching full operating speed, which is perceived as inefficient and reduces productivity.
Innovation Solution
A control system that utilizes an inertial measurement unit (IMU) to detect a pickup motion, allowing the motor and flywheel to increase speed to a target speed without actuating the trigger, thereby eliminating the spin-up delay and ensuring the tool is ready for immediate use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor and flywheel are designed to provide sufficient power for nail driving, then the motor must build up speed from rest, but this causes a significant spin-up delay that reduces productivity
Solution Approach 1:
The control system performs preliminary action by detecting when the user picks up the power tool and automatically activating the motor to spin up the flywheel to operating speed before the trigger is pulled. This preliminary speed buildup eliminates the delay that would otherwise occur when the tool is first activated, allowing immediate nail driving when the user is ready.
2Productivity
If the motor speed is increased quickly to reduce spin-up delay, then productivity improves, but the motor may not reach stable operating conditions
Solution Approach 1:
The control system activates the motor in advance during the pickup detection phase, allowing the flywheel to gradually build up speed and reach stable operating conditions before the user actually needs to drive a nail. This preliminary warm-up ensures the motor is both fast and stable when operation begins.
Solution Approach 2:
The control system dynamically adjusts motor operation based on detected user actions. It transitions the motor from an off state to a spin-up state upon detecting pickup motion, and maintains this elevated speed state until the trigger is pulled, optimizing both response time and operational stability throughout the usage sequence.
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
The system reduces the perceived motor spin-up delay, enabling the power tool to reach operational readiness faster, enhancing user experience and productivity by allowing immediate nail driving without additional delay.
Implementation Method 1
an inertial measurement unit (IMU) configured to output IMU data
Implementation Method 2
a motor including a flywheel
Implementation Method 3
a motor including a flywheel
Data Source
AI summary
Certain embodiments provide a power tool comprising a motor including a flywheel, an inertial measurement unit (IMU) configured to output IMU data, and a controller coupled to the motor and the IMU. The controller is configured to process the IMU data to generate processed IMU data, detect, based on the processed IMU data, whether the power tool has been moved in a pickup motion that is associated with an imminent use of the power tool, and increase a speed of the motor to a target speed in response to the detection.