Rotary Inductive Power Transfer Cooling With Self-Generated Airflow
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Solution Overview
Problem
Existing non-contact power transmission devices using magnetic coupling between coils face temperature rise issues due to heat generation during power transmission, necessitating short continuous energization times and cooling intervals, which reduces efficiency and shortens electronic component life.
Innovation Solution
The device incorporates a rotating portion with a fan and heat dissipation openings on the cover member, along with heat dissipation fins on the outer surfaces, to create airflow and enhance heat dissipation, preventing temperature rises and maintaining continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power transmission is performed using magnetic coupling between coils, then power transmission efficiency is improved, but temperature inside the device rises due to heat generation from the coils
Solution Approach 1:
The patent converts the rotational motion of the rotating portion (which causes the fan to generate airflow) into a beneficial cooling effect. The harm of heat generation during power transmission is transformed into useful airflow for heat dissipation, allowing continuous operation without cooling intervals.
Solution Approach 2:
The system uses its own rotational operation to generate the cooling airflow needed for heat dissipation. The rotating portion's motion drives the fan to create airflow that cools the coils, making the system self-cooling without requiring external cooling mechanisms.
2Productivity
If continuous energization time is extended, then productivity is improved, but temperature rise requires cooling intervals that reduce continuous operation time
Solution Approach 1:
The patent enables continuous power transmission operation by establishing a continuous cooling mechanism. The fan continuously generates airflow during rotation, maintaining temperature within acceptable ranges throughout operation, thus eliminating the need for cooling intervals and enabling uninterrupted continuous operation.
3Temperature
If cooling intervals are introduced to manage temperature, then temperature control is improved, but productivity decreases due to interruption of power transmission
Solution Approach 1:
The cooling mechanism operates continuously during rotation, eliminating the need for interruption-based cooling intervals. This allows uninterrupted continuous power transmission while maintaining effective temperature control through constant airflow generation.
4Temperature
If heat dissipation structures are added to the device, then temperature control is improved, but device complexity increases
Solution Approach 1:
The rotating portion serves multiple functions: it performs the primary rotation task and simultaneously drives the fan for cooling. This multi-functionality allows the system to achieve effective heat dissipation without adding separate dedicated cooling structures, thereby minimizing increases in device complexity.
Solution Approach 2:
The system uses its own rotational operation to drive the cooling fan, eliminating the need for separate power sources or control mechanisms for the cooling system. This self-service approach achieves effective heat dissipation while minimizing additional structural complexity.
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 configuration effectively suppresses temperature increases, allowing for extended continuous operation without cooling intervals, while maintaining power transmission efficiency and extending electronic component life.
Implementation Method 1
the cover member has a fan configured to generate airflow in which air is sucked into inside of the cover member and the sucked air is discharged to outside of the cover member
Implementation Method 2
one or more heat dissipation openings having a longitudinal direction orthogonal to the rotation axis may be positioned on a surface of the cover member configured to cover a side opposite to the fixed portion side, and an opening end surface in the longitudinal direction of the heat dissipation opening has an inclined surface inclined so as to spread from outside of the opening toward inside of the opening
Implementation Method 3
the rotation holding portion may be a cylindrical member fitted from the rotating portion side with the rotating portion disposed on the fixed portion, and the rotation holding portion guides an outer peripheral surface of the rotating portion on an inner peripheral surface of the rotation holding portion and is provided with heat dissipation fins on an outer peripheral surface of the rotation holding portion
Implementation Method 4
a non-contact power transmission device that transmits power by utilizing magnetic coupling between coils
Implementation Method 5
the first coil and the second coil generate heat due to the power transmission
Data Source
AI summary
A non-contact power transmission device according to one or more embodiments is disclosed, which may include a fixed portion, a rotating portion that rotates about an axis, and a base cover including these. The fixed portion includes a first coil, a first substrate, and a light emitting element. The rotating portion includes a second coil, a second substrate, a light receiving element, and a case cover. The case cover is formed with a heat dissipation opening having an inclined surface, and generates airflow in which air is sucked into the inside of the case cover and is discharged to the outside of the case cover, as the rotating portion rotates.