Armature Circuit Multi-Contact Structure for Electric Tool Battery Socket
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Solution Overview
Problem
Traditional armature circuits in battery type electric tools have high internal resistance due to series connections with switch contact points and battery socket contact points, leading to low efficiency, increased power consumption, and temperature rise, which hampers the tool's performance and safety.
Innovation Solution
The armature circuit design replaces traditional switch contact points with multi-contact movable and double-sided tilting contact structures, incorporating auxiliary elastic contact pieces to reduce internal resistance by connecting multiple contact points in parallel, thereby enhancing stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional switch contact points and elastic static contact points are used in series connection, then the circuit structure is simple, but the total internal resistance is large causing excessive current loss and low efficiency
Solution Approach 1:
The patent divides the single contact point into multiple contact points (at least two on each side of the battery pack connection). By segmenting the contact interface, multiple contact resistances are connected in parallel, reducing the total contact resistance and current loss while maintaining structural simplicity through the use of elastic contact pieces.
Solution Approach 2:
The patent transitions from a single-point contact to a multi-point contact arrangement by utilizing spatial distribution of contact points on the battery pack clips. This dimensional expansion from one point to multiple points in space allows parallel resistance paths without significantly increasing structural complexity.
2Productivity
If traditional series connection with switch and battery socket contact points is used, then the circuit is simple, but the operating efficiency decreases and temperature rise increases
Solution Approach 1:
The contact interface is segmented into multiple contact points (at least two per side) to reduce contact resistance. Lower resistance reduces power loss (P=I²R) and heat generation at the contact points, improving operating efficiency and reducing temperature rise while maintaining structural simplicity.
Solution Approach 2:
The patent converts the potentially harmful effect of contact resistance into a beneficial solution by using elastic contact pieces that can be optimized for both low resistance and mechanical reliability. The elastic material properties allow for controlled contact pressure, ensuring low resistance without excessive force.
3Loss of energy
If multi-contact movable contact point structure and double-sided tilting contact structure are used, then internal resistance is reduced and efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the battery pack clips: they serve as both structural connectors and multi-point electrical contacts. The clips integrate mechanical holding function with electrical conduction function, reducing the need for separate components and minimizing overall device complexity while achieving low resistance through parallel contact paths.
Solution Approach 2:
The battery pack clips are designed to perform multiple functions simultaneously: mechanical connection, electrical contact, and circuit switching. This multi-functionality reduces the number of separate components needed, maintaining structural simplicity while achieving the low resistance required for high efficiency through the multi-contact design.
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 design significantly reduces internal resistance, improves operating efficiency, and decreases temperature rise, allowing for increased motor hardness and reduced battery consumption while maintaining performance.
Implementation Method 1
one end of which is provided with an auxiliary elastic contact piece
Implementation Method 2
the other connection structure for the output part is changed to a double-sided tilting contact with a circuit switching function
Data Source
AI summary
The invention discloses an armature circuit in an electric tool and a power socket of the electric tool using the armature circuit, comprising a power supply and a motor. Two electrodes of the power supply are each provided with a connection structure connected to an output part. One connection structure is a multi-contact on/off controllable movable contact structure, and the other one is a double-faced multi-contact structure. According to the armature circuit, the internal resistance of the armature circuit of the motor is greatly reduced, the hardness of running characteristics of the motor is enhanced, and the working efficiency of the tool is improved; due to decreasing of the internal resistance, the current loss of the armature circuit is reduced, and the temperature rise of an electric appliance and contacts is reduced; with the same working efficiency, the battery capacity can be saved, and the battery cost is reduced.