Compression Nailer Motor Control With Battery-Adaptive Soft Stop
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Solution Overview
Problem
Existing powered fastener drivers face challenges with power, size, and cost constraints, particularly due to reliance on external air sources and inefficient motor control mechanisms.
Innovation Solution
A method and system for controlling a motor in a powered fastener driver that includes performing a load test on a battery pack, determining a mechanism control scheme, isolating controllers during operation, and adjusting control schemes based on sensed data to optimize motor operation, along with an onboard air compressor for self-sufficiency and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external air sources are used to power fastener drivers, then sufficient power can be achieved, but device complexity and size increase due to external connections and air compressor requirements
Solution Approach 1:
The patent combines the air compressor, battery pack, and control systems into a single integrated power tool unit. The compressor is positioned within the tool housing and directly connected to the fastening mechanism, eliminating the need for external air sources and complex external piping systems while maintaining sufficient power for fastening operations
Solution Approach 2:
The battery pack serves multiple functions: it powers the motor that drives the compressor, powers the control electronics, and provides portable operation without external connections. This multi-functional design reduces device complexity by consolidating power and control systems into a single universal energy source
2Device complexity
If traditional motor control mechanisms are used in powered fastener drivers, then simplicity is maintained, but power efficiency and precision are insufficient
Solution Approach 1:
The control system continuously monitors operational parameters such as motor current, compressor pressure, and battery voltage, and adjusts motor control signals in real-time based on this feedback. This closed-loop control optimizes power efficiency and precision while maintaining manageable device complexity through integrated electronic control
Solution Approach 2:
The motor control mechanism dynamically adjusts operating parameters including motor speed, torque, and duty cycle based on real-time operational conditions. This dynamic control enables precise power delivery and optimal efficiency across varying work conditions while using modern electronic control rather than simple mechanical mechanisms
3Adaptability or versatility
If onboard air compressors are integrated into power tools, then self-sufficiency and portability improve, but device size and weight increase
Solution Approach 1:
The air compressor is nested within the tool housing, with the compression chamber integrated into the existing structural space. The piston and cylinder assembly is positioned to utilize the available volume efficiently, and the drive mechanism is coupled directly to the motor output, minimizing the overall footprint and weight while maintaining self-sufficient operation
4Measurement precision
If multiple controllers are used for comprehensive control, then control precision and monitoring improve, but device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional controllers: a first controller dedicated to motor control and a second controller dedicated to data sensing and monitoring. This segmentation allows each controller to be optimized for its specific function, improving measurement precision and control accuracy while managing overall complexity through modular functional division
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 solution enhances the reliability and efficiency of powered fastener drivers by optimizing motor control and eliminating the need for external air sources, resulting in improved performance and user experience across various battery packs.
Implementation Method 1
A compressor piston is positioned in a compression chamber and is movable between a top-dead-center (TDC) position and a bottom-dead-center (BDC) position. The drive piston is positioned in a drive chamber that is in fluid communication with the compression chamber such that compressed air generated by the compressor piston acts upon the drive piston.
Implementation Method 2
A motor may be coupled to the crank arm assembly and operable to drive the compressor piston in a reciprocating fashion
Data Source
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AI summary
A method for controlling a motor of a power tool including performing a load test on a battery pack of the power tool, determining, via a first controller, a first mechanism control scheme based on the load test, receiving, via the first controller, a user input indicative of beginning an operation cycle of the power tool, and isolating the first controller from a second controller. The method further including controlling, via the first controller, the motor based on the first mechanism control scheme, sensing a dataset indicative of a result of the operation cycle based on the first mechanism control scheme, receiving, via the second controller, the dataset, connecting the first controller to the second controller upon completion of the operation cycle, transmitting, via the second controller, the dataset to the first controller, and determining, via the first controller, a second mechanism control scheme based on the dataset.