Magnetic Shield Plate Below Iron Bolts for Wireless Power
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Solution Overview
Problem
Conventional contactless power receiving devices face issues with reduced magnetic flux reception due to induction heating of iron bolts and potential loosening caused by vehicle vibrations, affecting the secure holding of the power reception coil unit.
Innovation Solution
A contactless power receiving device with a magnetic shield plate arranged below the iron bolts, featuring a rectangular shape and recessed bolt shield portions to reduce magnetic flux interference with the iron bolts, thereby increasing received magnetic flux and stabilizing the power reception coil unit's attachment to the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If iron bolts are used to fix the power reception coil unit, then the power reception coil unit can be securely attached to the vehicle body, but the iron bolts are heated by induction due to magnetic flux and the amount of magnetic flux received by the power reception coil decreases
Solution Approach 1:
The magnetic shield plate is divided into multiple functional regions: a shield plate main body that provides overall magnetic shielding, and separate bolt shield portions that specifically target the iron bolts. This segmentation allows different parts of the shield plate to perform specialized functions - protecting both the magnetic flux reception area and the bolt attachment points simultaneously.
Solution Approach 2:
The magnetic shield plate acts as an intermediary component positioned between the power supply coil and the iron bolts. By introducing this intermediate magnetic shielding structure, the harmful magnetic flux is redirected away from the iron bolts before they can be heated by induction, while still allowing the power reception coil to function effectively.
2Strength
If iron bolts are used to fix the power reception coil unit, then the power reception coil unit can be attached to the vehicle body, but the iron bolts may loosen due to vehicle vibrations
Solution Approach 1:
The magnetic shield plate combines two functions into a single component: magnetic shielding and mechanical reinforcement. The shield plate main body provides magnetic flux shielding, while the integrated bolt shield portions simultaneously serve as reinforcement structures that prevent bolt loosening from vibrations, eliminating the need for separate reinforcement components.
Solution Approach 2:
The magnetic shield plate utilizes composite structural design with the shield plate main body and bolt shield portions forming an integrated composite structure. This composite configuration provides both magnetic shielding properties and enhanced mechanical strength to resist vibration-induced loosening.
3Object-affected harmful factors
If a magnetic shield plate is arranged below the power reception coil unit, then magnetic flux diffusion to surroundings is suppressed, but the iron bolts are still affected by magnetic field and heated by induction
Solution Approach 1:
The magnetic shield plate implements local quality by creating regions with different shielding characteristics. The shield plate main body provides general magnetic flux containment, while the bolt shield portions create localized shielding zones specifically around the iron bolts. This local differentiation allows the structure to address both overall flux diffusion and localized bolt heating issues.
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 enhances the amount of magnetic flux received by the power reception coil while ensuring stable attachment of the power reception coil unit, addressing both flux reduction and holding strength concerns.
Implementation Method 1
a power reception coil configured to contactlessly receive magnetic flux sent from a power supply coil
Implementation Method 2
a magnetic shield plate configured to suppress diffusion of the magnetic flux received by the power reception coil unit to surroundings
Implementation Method 3
the iron bolts are affected by a magnetic field and are heated by induction
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A contactless power receiving device includes: a power reception coil unit 11 including a power reception coil 41 configured to contactlessly receive magnetic flux sent from a power supply coil; iron bolts 13 fixing the power reception coil unit 11 to a reinforcement member 5; and a magnetic shield plate 21 configured to suppress diffusion of the magnetic flux received by the power reception coil unit 11 to surroundings. The magnetic shield plate 21 is arranged below all of the iron bolts 13.