Dual-Rotor Halbach Generator Layout to Eliminate Cogging
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Solution Overview
Problem
Existing energy generation systems face inefficiencies due to cogging losses, material density issues, and flux leakage, leading to increased complexity and cost, as well as requiring more force to sustain motion.
Innovation Solution
A Non-Cogging High Efficiency Electric Generator design featuring dual rotors with pyramidal and Halbach magnets, eliminating iron cores and using non-magnetic stator windings to concentrate magnetic flux and minimize dispersion, thereby reducing material density and operational force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If iron cores are used to guide magnetic flux, then magnetic flux guidance is improved, but cogging losses and eddy current losses increase
Solution Approach 1:
The patent removes the iron core from the generator structure entirely, extracting the source of cogging losses and eddy current losses. The magnetic flux is guided through alternative means such as magnetic circuits formed by magnet arrangements and air gaps, eliminating the problematic ferromagnetic material while maintaining flux guidance functionality.
Solution Approach 2:
The patent replaces the mechanical iron core structure with a magnetic field-based guidance system using permanently magnetized elements and controlled air gaps. This substitution eliminates mechanical friction and magnetic hysteresis losses associated with iron cores while achieving the same flux guidance objective through magnetic field geometry.
2Loss of energy
If ferromagnetic materials are used, then magnetic flux guidance is improved, but material density and mass increase
Solution Approach 1:
The patent extracts ferromagnetic materials from the rotor and stator structures, eliminating eddy current losses that occur in conductive ferromagnetic materials. The design uses non-conductive magnetic circuits and air gaps to guide flux, removing the source of energy losses while reducing overall material mass.
Solution Approach 2:
The patent employs composite structures combining permanently magnetized materials with non-conductive, non-ferromagnetic materials such as plastics or ceramics. This composite approach maintains magnetic flux guidance functionality while eliminating eddy current paths and reducing density compared to traditional iron core constructions.
3Productivity
If conventional magnet arrangements are used, then manufacturing is simplified, but magnetic flux concentration is insufficient
Solution Approach 1:
The patent employs asymmetric magnet arrangements where magnets are positioned at specific non-uniform intervals or with varying polarities around the rotor circumference. This asymmetric configuration creates concentrated magnetic flux paths through controlled air gaps, increasing power generation efficiency while the modular nature of the asymmetric design keeps manufacturing complexity manageable.
Solution Approach 2:
The patent transitions from two-dimensional flat magnet surfaces to three-dimensional magnet geometries such as cylindrical, conical, or segmented magnet structures. This dimensional change creates focused magnetic flux concentration points and enhances the magnetic field gradient, improving power generation efficiency while maintaining manufacturability through standard machining processes.
4Loss of energy
If rotor steel plates are added to minimize flux leakage, then flux containment is improved, but rotor mass and force requirements increase
Solution Approach 1:
The patent removes rotor steel plates and replaces them with magnetic flux containment achieved through carefully designed air gaps and magnetic circuit geometries. The flux leakage is minimized by optimizing the spacing and arrangement of magnetic elements rather than using additional ferromagnetic shielding materials, thereby avoiding increased mass and force requirements.
Solution Approach 2:
The patent optimizes critical parameters such as air gap dimensions, magnet strength, and magnetic circuit geometry to minimize flux leakage. By adjusting these parameters, the system achieves effective flux containment without adding mass, maintaining low force requirements for rotation while maximizing magnetic coupling efficiency.
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 electrical and mechanical efficiency by eliminating cogging, reducing material mass, and increasing magnetic flux concentration through the stator windings, resulting in a more efficient and cost-effective power generation system.
Implementation Method 1
pyramidal shaped magnets to focus magnetic flux to a point
Implementation Method 2
Addition of Halbach magnets provides for guided magnetic path and minimizes flux leakage
Implementation Method 3
at least one stator with coils... rotating synchronously... generating electrical current in the stator windings
Data Source
AI summary
The invention relates to a non-cogging electric generator having at least one stator and at least one dual rotor, wherein the dual rotor comprises a plurality of primary magnet devices arranged in circular Halbach array. Non-cogging is achieved by having inner and outer rotor rotating synchronously. Concentration of magnetic flux is achieved by magnetic devices tapering into pyramidal shape, such that magnetic devices arranged on the inner rotor are facing magnetic devices on the outer rotor, whereas said magnetic devices are facing each other with the opposite polarity. Stator comprises electrical wire windings and is positioned between inner and outer rotor.