Rotor Power Receiving Core Structure for High-Speed Contactless Power
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Solution Overview
Problem
Existing contactless power supply techniques for motors, particularly in high-speed applications like automobile drive motors, face challenges with cores that are insufficient in strength due to high centrifugal forces and require materials with good electrical characteristics.
Innovation Solution
A power supply device with a power transmission unit and a power receiving unit, featuring a power receiving core with an annular recess and an outer peripheral member to cover its outer periphery, which reduces the load on the core by providing structural support and maintaining good electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a core is used for contactless power supply to the rotor, then power transmission capability is improved, but the core becomes insufficient in strength due to high centrifugal forces at high rotation speeds
Solution Approach 1:
The patent combines a power receiving core made of magnetic material with an outer peripheral member made of a different material (such as metal or composite material) to form a composite structure. This composite structure maintains good electrical characteristics through the magnetic core while the outer peripheral member provides the necessary mechanical strength to withstand high centrifugal forces at rotation speeds of about 20000 rpm.
2Power
If the core is made larger to supply several kW of power, then power transmission capability is improved, but the centrifugal force and load on the core increase
Solution Approach 1:
The patent uses a composite structure where the magnetic core maintains the necessary size for several kW power transmission while the outer peripheral member bears the centrifugal force load, effectively separating the functions of power transmission and mechanical load bearing.
Solution Approach 2:
The patent divides the power receiving unit into two functional parts: the inner power receiving core for electromagnetic coupling and power reception, and the outer outer peripheral member for mechanical support. This segmentation allows each part to be optimized for its specific function without compromising the other.
3Reliability
If a material with good electrical characteristics is used for the core, then electrical performance is improved, but the material is insufficient in strength to withstand high rotation speeds
Solution Approach 1:
The patent employs a composite structure where the magnetic core material (such as ferrite or other magnetic materials) provides excellent electrical and magnetic characteristics for efficient contactless power transfer, while the outer peripheral member made of stronger material provides the mechanical strength needed to withstand high rotation speeds of about 20000 rpm.
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 effectively reduces stress on the power receiving core, allowing it to withstand high rotation speeds and large power supplies without the need for developing new materials, by using existing materials with good electrical properties and adding a lightweight, high-strength outer peripheral member.
Implementation Method 1
a power supply unit configured to supply power to a rotor in a contactless manner, in which the power supply unit includes a power transmission unit configured to transmit power to the rotor
Implementation Method 2
a power receiving unit provided on a side close to the rotor and configured to receive power from the power transmission unit in a contactless manner
Data Source
AI summary
A power supply device includes a power supply unit configured to supply power to a rotor in a contactless manner. The power supply unit includes a power transmission unit configured to transmit power to the rotor, and a power receiving unit provided on a side close to the rotor and configured to receive power from the power transmission unit in a contactless manner. The power receiving unit includes a power receiving core having an annular recess that accommodates a coil and an opening portion of the annular recess on a side close to the power transmission unit, and an outer peripheral member provided to cover an outer periphery of the power receiving core.