Power Tool Current Conductor Geometry for High-Current Heat Dissipation
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Solution Overview
Problem
Power tools face challenges in handling high electrical loads, as existing current conductors often result in thermal overloads when transmitting large constant currents, which can vary significantly depending on the tool's power requirement.
Innovation Solution
A power tool with current conductors having a circumference greater than two and a half times the square root of their cross-sectional area, optimized for heat dissipation, allowing the transmission of currents up to 100 amperes or more without thermal overloads, and an energy supply device with low internal resistance for efficient energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current conductors are used in power tools, then the device complexity remains low, but thermal overloads occur when transmitting large constant currents
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the current conductor - specifically the ratio of circumference to cross-sectional area. By requiring U > 2.5√(πA), the conductor's thermal dissipation parameters are optimized to handle high currents without thermal overload, while maintaining practical manufacturability through standardized conductor shapes like rectangular busbars.
2Reliability
If the current conductor cross-sectional area is increased to handle high currents, then the current-carrying capacity improves, but the space occupied in the power tool increases
Solution Approach 1:
The patent optimizes the conductor's geometric parameters by controlling the circumference-to-cross-sectional area ratio. This allows achieving the required current-carrying capacity through optimized surface area for heat dissipation rather than simply increasing volume, thus reducing the space occupied in the power tool while maintaining reliability.
3Temperature
If the current conductor is optimized for heat dissipation, then thermal management improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a minimum threshold condition (U > 2.5√(πA)) rather than exact dimensional requirements. This inequality-based specification provides manufacturing tolerance, allowing standard conductor shapes and sizes to be used as long as they meet the minimum geometric criterion, thus balancing heat dissipation optimization with manufacturing feasibility.
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 enables power tools to handle high constant currents effectively, improving current-carrying capacity and thermal management, ensuring reliable operation even under demanding conditions.
Implementation Method 1
a circumference U of the at least one current conductor is greater than two and a half times the square root of the product of a cross-sectional area A of the at least one current conductor and pi π... optimized for heat dissipation
Implementation Method 2
The at least one current conductor is configured in particular to connect components of the power tool in an electrically conductive manner, so that currents can flow between the components
Data Source
AI summary
A power tool, wherein the power tool has at least one current conductor, wherein a circumference U of the at least one current conductor is greater than two and a half times the square root of the product of a cross-sectional area A of the at least one current conductor and pi π. The at least one current conductor can include a series of individual current conductors, wherein the circumference U of the at least one current conductor corresponds to the enveloping circumference of the individual current conductors, and wherein the cross-sectional area A of the at least one current conductor can be formed from the sum of the cross-sectional areas of the individual current conductors. The power tool can be connected to an energy supply device in order to be supplied with electrical energy. An energy supply device for use in a power tool, i.e. for supplying a power tool with electrical energy.