Inductive Energy Transfer Device with Symmetrical Iron Core
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Solution Overview
Problem
Existing inductive energy transfer devices face inefficiencies and noise issues due to asymmetrical transformer designs and complex arrangements required for mobile energy transfer, particularly in maintaining constant air gaps and preventing iron core saturation.
Innovation Solution
A magnetically symmetrical three-phase inductive energy transfer device with equilateral triangle or star-shaped iron core parts and parallel ferromagnetic track rails, utilizing ferromagnetic running rollers to minimize air gaps and ensure constant magnetic flux paths, resulting in efficient and low-noise energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an asymmetrical transformer design is used for mobile energy transfer, then the device can adapt to different positions, but the iron core becomes saturated and efficiency decreases
Solution Approach 1:
The patent applies asymmetry in reverse - it uses a symmetrical transformer design where the primary and secondary windings are arranged symmetrically with respect to the magnetic core. This symmetrical arrangement ensures that magnetic flux is distributed evenly across all iron core paths, preventing saturation in any single path while maintaining efficient energy transfer across the air gap.
2Adaptability or versatility
If an asymmetrical transformer design is used for mobile energy transfer, then the device can adapt to different positions, but noise increases considerably
Solution Approach 1:
The patent uses symmetrical winding arrangement around the magnetic core to create balanced magnetic flux distribution. This symmetry prevents localized magnetic saturation and the associated humming noises that occur in asymmetrical designs, thereby reducing noise generation during mobile energy transfer operations.
3Reliability
If a complex arrangement with auxiliary windings is used, then iron core saturation can be prevented, but the device complexity increases
Solution Approach 1:
The patent extracts the complexity of auxiliary windings and control systems by using a simple symmetrical transformer design. The symmetrical arrangement of primary and secondary windings naturally prevents iron core saturation through balanced magnetic flux distribution, eliminating the need for additional auxiliary windings or complex control mechanisms.
4Loss of energy
If the air gap is kept constant in inductive energy transfer, then efficient energy transfer is achieved, but the track must be kept free of impurities and the arrangement is complicated
Solution Approach 1:
The patent employs a mechanical rolling connection between the mobile secondary system and the track-based primary system. This rolling contact dynamically maintains optimal magnetic coupling and constant air gap distance without requiring complex active control systems or strict impurity restrictions, as the mechanical contact itself ensures consistent positioning.
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 symmetrical design achieves high efficiency and constant power transfer with minimized stray fluxes and noise, regardless of the mobile system's position, and eliminates the need for complex auxiliary windings and asymmetrical transformer arrangements.
Implementation Method 1
transformer principle have the task of transmitting energy with the aid of AC voltages. This is done with the aid of a magnetic circuit around which conductors of two different electrical circuits are wound. If an AC voltage is applied to a transformer primary coil, an AC voltage is likewise produced at the secondary coil.
Implementation Method 2
ferromagnetic running rollers which are accommodated in recesses in the mobile supporting posts
Data Source
AI summary
A device for inductive energy transfer between a stationary three-phase primary system and a mobile three-phase secondary system shows a stationary iron core part and two mobile iron core parts (3, 5) which are connected electrically in series are each designed as an equilateral triangle or as a star which spans an equilateral triangle and has limbs (3a, 3b, 3c; 5a, 5b, 5c) of equal length which run at the same angle in relation to one another, and supporting posts (3a′, 3b′, 3c′; 5a′, 5b′, 5c′) which start from the ends of said limbs, and also primary and secondary windings (4, 6) which are arranged at the same distance from one another. The device of simple design has a high degree of efficiency in respect of energy transfer. In the case of energy transfer only in the inoperative state, a stationary iron core part and a mobile iron core part can also be positioned directly one on the other without magnetic rails.