Superconducting Rotor Spliceless Loop Winding for Low-Heat Rotation
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Solution Overview
Problem
Conventional superconducting rotating machines face challenges in achieving highly-efficient synchronous rotation and low heat generation due to the presence of solder joints, which attenuate magnetic flux and generate heat, especially in large motors.
Innovation Solution
A superconducting rotating machine design that uses coil-shaped spliceless loop members made of superconducting material, eliminating the need for solder joints and allowing for efficient synchronous rotation with reduced heat generation by housing these loop members in slots for thermal conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solder joints are used to join rotor bars and end rings in a superconducting squirrel-cage winding, then the structure can be assembled, but current attenuation and heat generation occur due to the normal conducting alloy joints
Solution Approach 1:
The invention extracts and removes the solder joints (normal conducting alloy connections) from the superconducting squirrel-cage winding structure. By eliminating these joints entirely and using a spliceless loop member design, the source of current attenuation and heat generation is removed, allowing the winding to maintain superconducting state throughout without energy losses at connection points.
Solution Approach 2:
The invention uses composite construction by integrating the rotor bars and end rings into a single spliceless loop member made of superconducting material. This composite approach eliminates the need for joining different components with normal conducting materials, allowing the entire winding structure to function as a unified superconducting element without resistance-induced energy losses.
2Reliability
If a conventional superconducting rotating machine is cooled below critical temperature, then the superconducting state is achieved, but the superconducting squirrel-cage winding enters magnetic shielding state and does not trap magnetic flux, preventing rotor startup
Solution Approach 1:
The invention applies dynamic control to the magnetic flux trapping process by controlling the application timing and characteristics of AC voltage to the stator winding. The system dynamically transitions the superconducting rotor from magnetic shielding state to magnetic flux trapping state by applying AC voltage at appropriate moments during operation, enabling controlled startup and transition to synchronous rotation mode.
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 maintains a highly-efficient synchronous rotation state with minimal heat generation, suitable for large applications like ships, automobiles, and aircraft, by eliminating current attenuation and heat issues associated with solder joints.
Implementation Method 1
coil-shaped spliceless loop members made of a superconducting material
Implementation Method 2
generates a rotating magnetic field; an induced current (magnetic flux flow current) is created, an induced torque is generated
Implementation Method 3
housing these loop members in slots for thermal conduction
Data Source
AI summary
A superconducting rotating machine, including: a stator that has a tubular stator iron core and a stator winding wound around the stator iron core, and that generates a rotating magnetic field, and a superconducting rotor that is rotatably held by the rotating magnetic field of the stator, and that has a superconducting winding including a plurality of coil-shaped spliceless loop members made of a superconducting material, and a rotor iron core including a slot for housing the spliceless loop members.