Toroidal Superconducting Rotating Machine Using Leakage Flux Torque
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Solution Overview
Problem
Conventional rotating machines using superconducting materials for stators face inefficiencies due to large leakage magnetic flux, which reduces energy conversion efficiency and affects peripheral devices, necessitating additional magnetic shields.
Innovation Solution
A superconducting rotating machine design featuring a toroidal stator with a cylindrical iron core and superconducting stator winding, along with inner and outer rotors equipped with superconducting and normal conducting squirrel cage windings, effectively harnessing and shielding leakage magnetic flux to enhance energy conversion efficiency and torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a toroidal stator is used to increase critical current, then energy conversion efficiency is improved, but leakage magnetic flux increases causing harmful effects on peripheral devices
Solution Approach 1:
The patent converts the harmful leakage magnetic flux into beneficial torque by introducing an outer rotor with superconducting squirrel cage windings. The leakage flux that would otherwise be wasted now induces currents in the outer rotor bars, generating additional torque and improving overall energy conversion efficiency
Solution Approach 2:
The patent employs a nested structure with an inner rotor containing superconducting windings positioned inside the stator, and an outer rotor with superconducting squirrel cage windings positioned outside the stator. This nested configuration allows the inner rotor to generate primary torque while the outer rotor utilizes leakage flux to generate additional torque
2Force
If a toroidal stator is used to enhance critical current, then torque output is improved, but additional magnetic shields are required to prevent leakage flux influence
Solution Approach 1:
Instead of using magnetic shields to block leakage flux, the patent introduces an outer rotor that converts the leakage flux into useful torque. This eliminates the need for additional magnetic shields and their associated complexity while simultaneously improving torque output
Solution Approach 2:
The outer rotor with superconducting squirrel cage windings serves dual functions: it generates torque from the rotating magnetic field like a conventional rotor, and simultaneously utilizes the leakage magnetic flux that would otherwise be harmful. The system essentially uses its own leakage flux to generate additional power
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 significantly improves energy conversion efficiency and torque output by converting leakage magnetic flux into usable torque and shielding peripheral devices, enabling high-efficiency operation with reduced joule loss.
Implementation Method 1
a stator winding that is toroidally wound around the stator iron core and formed of a superconducting material, and generates a rotating magnetic field
Implementation Method 2
a superconducting rotating machine that has a configuration of an induction machine but is capable of synchronous rotation
Implementation Method 3
easily captures magnetic flux for synchronous rotation
Implementation Method 4
the inner rotor and the outer rotor each include at least one rotor winding selected from a superconducting squirrel cage winding (a) including a single or a plurality of rotor bars and end rings
Data Source
AI summary
A superconducting rotating machine includes a stator that includes a cylindrical stator iron core and a stator winding that is toroidally wound around the stator iron core and formed of a superconducting material, and generates a rotating magnetic field, an inner rotor rotatably held at an inner circumferential side of the stator, and an outer rotor rotatably held at an outer circumferential side of the stator. The inner and outer rotors each include at least one rotor winding selected from a superconducting squirrel cage winding including a single or a plurality of rotor bars and end rings that are formed of a superconducting material, and a normal conducting squirrel cage winding including a single or a plurality of rotor bars and end rings that are formed of a normal conducting material, and a rotor iron core including a plurality of slots that accommodate respective rotor bars of the rotor winding.