Contactless Power Transfer for Electric Construction Machine Joints
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Solution Overview
Problem
Existing electric construction machines face challenges with smooth operation due to long wires transmitting DC power, which complicate the enclosing structure and increase the risk of electrical leakage across joint components.
Innovation Solution
A driving apparatus that converts power to high-frequency AC power and uses contactless transmission units to power joint components, eliminating the need for lengthy wires and maintaining smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a long wire is used to transmit DC power from the generator to the actuator across multiple joint components, then power can be transmitted to the joint component, but the operation of the joint component becomes unsmooth and the enclosing structure becomes more complicated and larger
Solution Approach 1:
The patent replaces the mechanical wire-based power transmission system with an electromagnetic contactless power transmission system. The transmitting unit (with transmitting coil) and receiving unit (with receiving coil) enable wireless energy transfer through electromagnetic coupling, eliminating the need for physical wire connections across moving joint components. This substitution resolves the contradiction by maintaining power transmission capability while removing the mechanical constraints that hindered smooth operation.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary medium for power transmission. The transmitting coil generates an electromagnetic field that couples with the receiving coil to transfer power without direct physical contact. This intermediary approach allows power to be transmitted across the joint components without requiring wires to pass through them, thus maintaining smooth operation while enabling power delivery.
2Use of energy by moving object
If a long wire is used to transmit DC power across joint components, then power can be supplied to the actuator, but the enclosing structure becomes more complicated and larger
Solution Approach 1:
The patent replaces the mechanical wire routing system with an electromagnetic contactless power transmission system. By using transmitting and receiving coils that generate electromagnetic fields, the system eliminates the need for complex wire management across joint components. This reduces the enclosing structure's complexity and size while maintaining power transmission functionality.
Solution Approach 2:
The patent extracts the wire-based power transmission element from the system and replaces it with contactless electromagnetic coupling. By removing the physical wire connections that complicated the enclosing structure, the invention simplifies the overall design while preserving the essential power transmission function through electromagnetic fields.
3Use of energy by moving object
If a long wire is used to transmit DC power across joint components, then power can be transmitted to the actuator, but the risk of electrical leakage increases
Solution Approach 1:
The patent replaces the wire-based electrical connection system with a contactless electromagnetic power transmission system. By using magnetic coupling between transmitting and receiving coils, the system eliminates direct electrical contacts that are prone to leakage. This substitution maintains power transmission capability while significantly reducing electrical leakage risk through non-contact energy transfer.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary that enables power transmission without direct electrical contact. The magnetic field acts as a safe mediator between the power source and the actuator, eliminating the need for exposed wires across joint components and thereby reducing electrical leakage hazards while maintaining reliable power delivery.
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 efficient and safe power transmission to joint components without hindering their smooth operation, simplifying the structure and reducing the risk of electrical leakage.
Implementation Method 1
a contactless transmission unit that contactlessly transmits the converted AC power in a joint component of an electric machine
Data Source
AI summary
A driving apparatus of an electric construction machine including a lower traveling body, an upper rotating body that is attached to the lower traveling body, a boom attached to the upper rotating body, an arm that is attached to the boom, and a bucket that is attached to the arm, includes: a battery that generates DC power, DC/AC converters that convert the DC power generated by the battery into AC power, a contactless transmission unit that contactlessly transmit the AC power converted by the DC/AC converters in joint components of the electric construction machine, and an actuator that drives the joint component based on the AC power transmitted from the contactless transmission unit.