Dielectric Stator Block for Radial Flux Alternator
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Solution Overview
Problem
Existing dynamo-based power generation systems fail to account for non-mechanical sources of rotational resistance, such as cogging and eddy currents, which reduce net power output and increase maintenance costs in low-speed applications like unmanned maritime platforms and wind power generation.
Innovation Solution
An energy conversion system featuring a cylindrical rotor with permanent magnets and a dielectric stator wound with copper wire, designed to minimize eddy current drag and cogging forces by using dielectric materials and optimizing coil configuration, allowing operation at low rotational speeds without the need for step-up gearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional ferrous or conductive stator materials are used, then structural strength and electrical conductivity are improved, but eddy current losses and cogging forces increase
Solution Approach 1:
The patent removes conductive and ferrous materials from the stator structure, extracting the harmful elements that cause eddy currents and cogging forces. The stator is constructed entirely from non-conductive, non-ferrous materials such as fiberglass-reinforced plastic, eliminating the source of energy losses while maintaining structural integrity through composite material properties.
Solution Approach 2:
The patent employs composite materials, specifically fiberglass-reinforced plastic, to construct the stator. This composite provides the necessary structural strength and rigidity without the conductive or ferrous properties that cause eddy currents and cogging, thereby resolving the contradiction between strength and energy loss.
2Power
If permanent magnets are positioned close to coils for efficient flux linkage, then electrical output is improved, but cogging forces and magnetic attraction resistance increase
Solution Approach 1:
The patent introduces non-conductive spacers and positioning structures as intermediaries between the permanent magnets and the stator coils. These intermediaries maintain the optimal close proximity for efficient magnetic flux linkage and high electrical output while preventing direct contact that would create cogging forces and magnetic attraction resistance.
3Speed
If mechanical step-up gearing is added to increase rotational speed, then electrical output voltage is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces the mechanical step-up gearing system with an optimized electromagnetic design. By using permanent magnets strategically positioned around the rotor and carefully designed coil windings on the stator, the system achieves high electrical output voltage directly at low rotational speeds, eliminating the need for mechanical transmissions and their associated complexity and maintenance.
4Strength
If conductor materials like aluminum or steel are used in structural components, then structural strength is improved, but eddy current formation and energy leakage increase
Solution Approach 1:
The patent extracts and removes all conductive materials including aluminum and steel from structural components within the magnetic field region. The entire generator housing and structural elements are constructed from non-conductive materials such as fiberglass-reinforced plastic, eliminating the harmful eddy current formation and energy leakage while maintaining structural strength through composite material properties.
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 system significantly reduces energy losses and maintenance costs by eliminating non-mechanical sources of resistance, enabling efficient power generation at low rotational speeds and extending spin-down time, thus improving reliability and reducing operational expenses in remote applications.
Implementation Method 1
cogging, which is caused by attraction between the permanent magnets and the ferrous cores at the center of the stator's coils and Eddy currents which form in conductive materials and create a tangible mechanical resistance
Implementation Method 2
the interaction of the moving permanent magnets with ferrous, metallic, or otherwise conductive components of the generator
Data Source
AI summary
An energy conversion system is described and includes a cylindrical rotor having a mass and multiple magnets affixed on an outer face thereof; a cylindrical stator including a dielectric cylinder wound with copper wire in a predetermined configuration, the cylindrical rotor being placed within the cylindrical stator; and a rotatable shaft for rotating the rotor, the rotatable shaft being placed in the center of the cylindrical rotor. The system harvests environmental energy for lower power generation and accounts for non-mechanical sources of rotational resistance within the generator.