Counter-Rotating Generator Rotors With Magnetic Flywheel Support
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Solution Overview
Problem
Conventional generators face inefficiencies due to the need for high rotational speeds of the rotor, which leads to operational inefficiencies, wear, and fluctuations in output frequency, especially when using multiple prime movers or variable wind conditions.
Innovation Solution
A generator design featuring coaxially aligned first and second rotors with independent prime movers rotating in opposite directions, supported by flywheels with magnetic supports and stabilizers, allowing for efficient power generation and frequency regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor is spun at a faster rotational speed to generate higher voltage and frequency, then the power output is improved, but the bearing assemblies suffer significant wear and operational reliability deteriorates
Solution Approach 1:
The single rotor system is segmented into two counter-rotating rotors (outer rotor and inner rotor), each driven by separate prime movers. This segmentation allows the system to achieve high relative rotational speed between rotors for power generation while each individual rotor operates at lower speed, reducing bearing wear and improving reliability.
2Power
If multiple prime movers are used to achieve higher power output, then the power generation capacity is improved, but gearing mechanisms are required which result in further operational inefficiencies
Solution Approach 1:
Multiple prime movers are merged into a single integrated generator system with counter-rotating rotors. The outer rotor and inner rotor are directly coupled to their respective prime movers without intermediary gearing, eliminating mechanical transmission losses while combining the power output of multiple prime movers into a unified electrical generation system.
3Productivity
If the rotor is required to spin at a rapid rotational frequency over a long period of time, then the power output is maintained, but part wear and failure increase
Solution Approach 1:
The continuous high-speed rotation requirement is segmented across two counter-rotating rotors, each operating at lower individual speeds. This segmentation distributes the mechanical stress and wear across two separate bearing assemblies operating at reduced speeds, thereby maintaining continuous power output while reducing part wear and failure rates.
4Measurement precision
If a mechanical governor mechanism is used to regulate output frequency, then the frequency control is achieved, but there is a delay in adjusting the turbine's blades which results in fluctuations in the generator's output frequency
Solution Approach 1:
The system employs dynamic control through two independently controlled counter-rotating rotors. When frequency regulation is needed, one prime mover can be rapidly adjusted while the other maintains stability, creating a dynamic response system that reduces the time delay inherent in traditional single-rotor governor mechanisms and minimizes output frequency fluctuations.
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 design enables high-power output at lower individual rotor speeds, reduces wear, and stabilizes frequency fluctuations, improving efficiency and reliability.
Implementation Method 1
The rotors combine to form a magnetic field and armature pair for generating electricity
Implementation Method 2
one or more magnetic supports arranged relative to the annular magnet to cause at least one vertically acting magnetic force to be exerted on the annular magnet to support a weight of the flywheel
Implementation Method 3
magnetic polarities of the surfaces match a magnetic polarity of an outward facing surface of the annular magnet such that the stabilisers cause a pair of opposed magnetic repulsion forces to be exerted on the annular magnet to impede lateral movement of the flywheel to stabilise the flywheel
Data Source
AI summary
A generator comprises a pair of coaxially aligned rotors including an inner rotor disposed within an outer rotor that combine to form a magnetic field and armature pair. First and second prime movers rotate the rotors in opposite relative directions such that electricity is produced from relative rotation of the magnetic field and armature. First and second flywheels are connected to or integral with the rotors to rotate therewith. Each flywheel has a magnetic circumference. One or more magnetic supports are arranged relative to the circumference to cause at least one vertically acting magnetic force to be exerted on the circumference to support the flywheel's weight. A pair of magnetic stabilisers are arranged on respective opposed lateral sides of each flywheel. The stabilisers cause opposed horizontally acting magnetic forces to be exerted on the flywheel's circumference to impede lateral movement of the flywheel to stabilise the flywheel.