Rotary Magnetic Coupling Device with Overlapping Coils
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Solution Overview
Problem
Conventional rotary type power transmission devices using contact-type slip rings for electric power transmission to rotators face issues with abrasion and unstable output characteristics due to positional changes between coils during rotation.
Innovation Solution
A rotary type magnetic coupling device with loop coils where at least one set of coils has wiring parts bent in the rotary axis direction, allowing these parts to match or overlap when viewed radially, ensuring stable magnetic coupling and output characteristics despite positional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional loop-shaped coils with gaps between conducting wires are used, then the device structure is simple, but the output characteristics become unstable when the rotational position changes
Solution Approach 1:
The patent applies asymmetry by configuring the loop coil such that the third wiring part and fourth wiring part match or overlap when viewed in the radial direction, creating an asymmetric structure relative to the rotational axis. This asymmetric configuration ensures that the overlapping area between transmitting and receiving coils remains constant regardless of rotational position, thereby stabilizing the magnetic coupling and output characteristics while maintaining structural simplicity
Solution Approach 2:
The patent transitions from a planar two-dimensional coil layout to a three-dimensional configuration where the third and fourth wiring parts extend in the radial direction and match or overlap. This dimensional change allows the coil to maintain consistent magnetic coupling across all rotational positions by utilizing the radial dimension to compensate for rotational displacement
2Reliability
If the coil wiring parts are extended in the radial direction to match or overlap, then stable output characteristics are achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the coil wiring by extending the third and fourth wiring parts in the radial direction and configuring them to match or overlap. This parameter modification (changing from planar to radial extension) achieves stable magnetic coupling while remaining compatible with conventional coil winding and fabrication techniques, thus balancing manufacturing ease with performance stability
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 device achieves stable power and signal transmission by minimizing variations in the overlapping area between coils, thereby maintaining consistent output characteristics even as the rotator rotates.
Implementation Method 1
a power receiving coil provided in a rotator and a power feeding coil provided opposite to the power receiving coil and configured to supply electric power from the power feeding coil to the power receiving coil in a non-contact manner utilizing electromagnetic induction action
Implementation Method 2
The first and second coils are each a loop coil disposed such that the opening thereof surrounds the rotary axis of the rotator
Data Source
AI summary
Disclosed herein is a rotary type magnetic coupling device including first and second coils magnetically coupled to each other used for a rotator. Each of the first and second coils is a loop-shaped having an opening surrounding a rotary axis of the rotator. Each of the first and second coils includes first and second wiring parts extending in a peripheral direction of the rotator, a third wiring part bent in the rotary axis direction from one end of the first and second wiring parts, and a fourth wiring part bent in the rotary axis direction from other end of the first and second wiring parts. At least one of the first and second coils is configured such that the third and fourth wiring parts match or overlap each other when viewed in a radial direction substantially orthogonal to the rotary axis.