Wireless Power Transmission for Direct Drive Robots
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Solution Overview
Problem
Direct drive type robots with cable carriers face issues such as increased motor size, noise, dust generation, and electromagnetic interference due to the need for continuous power supply and mechanical movement with the cable carrier, which limits their application in precision manufacturing facilities.
Innovation Solution
A wireless power transmission apparatus using magnetic resonance between power transmission and reception coils eliminates the need for cable carriers, reducing motor size, noise, and electromagnetic interference by enabling non-contact power transfer and easy adjustment of resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable carrier is used to supply power to the movable member, then power supply reliability is improved, but the motor size increases due to the need to drive the cable carrier
Solution Approach 1:
The patent replaces the mechanical cable carrier system with a wireless power transmission system using magnetic resonance coupling. The power transmission coil is fixed to the rail member and the power reception coil is attached to the movable member, enabling non-contact power transfer through magnetic fields. This eliminates the mechanical coupling and weight of the cable carrier while maintaining reliable power supply to the movable member throughout its travel range.
2Duration of action of stationary object
If a cable carrier is used to supply power to the movable member, then power supply continuity is improved, but noise and dust generation increase due to repeated contact with peripheral members
Solution Approach 1:
The patent replaces the mechanical cable carrier system with a wireless power transmission system using magnetic resonance coupling. The power transmission coil is fixed to the rail member and the power reception coil is attached to the movable member, enabling non-contact power transfer through magnetic fields. This eliminates the mechanical coupling and weight of the cable carrier while maintaining reliable power supply to the movable member throughout its travel range.
3Adaptability or versatility
If the movable member travels a longer distance along the rail member, then the applicable range is improved, but the cable carrier length increases requiring larger motor output
Solution Approach 1:
The patent replaces the mechanical cable carrier system with a wireless power transmission system using magnetic resonance coupling. The power transmission coil is fixed to the rail member and the power reception coil is attached to the movable member, enabling non-contact power transfer through magnetic fields. This eliminates the mechanical coupling and weight of the cable carrier while maintaining reliable power supply to the movable member throughout its travel range.
4Device complexity
If a cable carrier is used for power supply, then the system structure is simplified, but electromagnetic interference with other machines increases
Solution Approach 1:
The patent applies local quality by confining the electromagnetic field interaction to a localized region between the transmission and reception coils. The magnetic resonance coupling creates a focused energy transfer zone with rapid decay outside this region, thereby limiting electromagnetic interference to the immediate vicinity of the movable member while maintaining effective power transfer.
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 reduces the size of the motor and the entire machine, minimizes noise and dust, and limits electromagnetic interference, allowing for more versatile and efficient operation in manufacturing facilities by ensuring reliable power supply to the movable member regardless of its position or distance.
Implementation Method 1
the power reception coil receives electric power needed for driving a motor from the power transmission coil without contacting therewith, due to a magnetic resonance (or a magnetic field resonance) that occurs between the power reception coil and the power transmission coil
Data Source
AI summary
A direct drive type system such as a direct drive type robot is provided. This system includes a rail member, a movable member guided by the rail member and movable along the rail member, and an electric motor to drive the movable member. The system includes a transmission coil and a reception coil. The transmission coil has plural transmission coil segments which are planar coils and arranged on and along the rail member. High-frequency power is supplied to the transmission coil from a power source. The reception coil is arranged on the movable member to be opposed to the transmission coil and configured to an area faced with each of the transmission coil segments, wherein the area is smaller than that of each transmission coil segment. The reception coil receives power from the transmission coil without contact by a magnetic resonance. The received power is supplied to the motor.