Superconductive Rotor with Composite Squirrel-Cage Winding
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Solution Overview
Problem
Existing superconductive rotating machines face inefficiencies in torque generation and magnetic flux trapping due to the use of bulk superconductive materials, which lead to poor heat dissipation and difficulty in achieving synchronous rotation, and the methods for trapping magnetic flux are either time-consuming or require complex magnetic field generation.
Innovation Solution
A superconductive rotor design incorporating a squirrel-cage winding made of superconductive wires with a highly conductive metal covering, integrated with a normally conductive squirrel-cage winding, allowing for both inductive and synchronous rotation by switching between induced and synchronous torque modes, with a control system to manage the transition between these states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bulk superconductive materials are used for magnetic flux trapping, then synchronous rotation is achieved, but heat dissipation performance deteriorates
Solution Approach 1:
The bulk superconductive material is segmented into multiple superconductive wires arranged in a squirrel-cage winding configuration. Each wire has a cross-sectional area of 0.1 to 10 mm², creating distributed heat dissipation paths while maintaining collective magnetic flux trapping capability for synchronous rotation
Solution Approach 2:
The superconductive wires are covered with highly conductive metal layers (such as silver, copper, or aluminum) to form composite structures. This composite design enhances heat dissipation through the conductive metal while the superconductive core maintains magnetic flux trapping functionality
2Reliability
If torque shield with specific skin depth is used, then magnetic field intensity is controlled below Hc2, but device complexity increases
Solution Approach 1:
The squirrel-cage winding serves multiple functions simultaneously: it provides the torque shield function to control magnetic field intensity below Hc2, generates induced torque during acceleration, and traps magnetic flux for synchronous rotation. This eliminates the need for separate torque shield structures
Solution Approach 2:
The torque shield function is merged with the rotor winding structure itself. The squirrel-cage winding's inherent electrical conductivity and geometric configuration provide the necessary skin depth effect to control magnetic field penetration without requiring additional dedicated torque shield components
3Reliability
If superconductive material is cooled to critical temperature, then synchronous rotation is enabled, but transition time increases
Solution Approach 1:
The highly conductive metal covering on superconductive wires provides efficient thermal conduction paths, accelerating heat removal during cooling. This composite structure reduces the time required to reach critical temperature while maintaining superconductive properties
Solution Approach 2:
The segmented wire structure creates multiple independent thermal conduction paths to the cooling medium, increasing overall heat transfer efficiency and reducing the time required to cool the entire superconductive assembly to critical temperature
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 provides improved heat dissipation and efficient magnetic flux trapping, enabling seamless transitions between inductive and synchronous rotation modes while maintaining a simple and cost-effective structure, thus overcoming the limitations of bulk superconductive materials.
Implementation Method 1
when the superconductive squirrel-cage winding is in a superconductive state, rotations are mainly made by a synchronous torque generated by the superconductive squirrel-cage winding trapping magnetic flux of the rotating magnetic field
Implementation Method 2
a plurality of superconductive wires covered with a highly conductive metal
Implementation Method 3
rotations are mainly made by an induced torque generated on the normally conductive squirrel-cage winding due to a rotating magnetic field
Data Source
AI summary
The main problem to be solved by the invention is to provide a superconductive rotor, a superconductive rotating machine and a superconductive rotating-machine system which are capable of inductive and synchronous rotation while employing the induction machine configuration and also offer satisfactory heat dissipation performance, stability under an excessive load, and easy magnetic flux trap for synchronous rotation. To solve the problem, the invention provides a superconductive rotor, as shown in FIG. 1, including a superconductive squirrel-cage winding formed by superconductive wires having a plurality of superconductive wires covered with a highly conductive metal; a normally conductive squirrel-cage winding formed by a normally conductive material; a cylindrical rotor core having a plurality of slots for accommodating the rotor bars of both of the squirrel-cage windings; and a rotor shaft coaxially provided to the rotor core, wherein, when the superconductive squirrel-cage winding is in a non-superconductive state, rotations are mainly made by an induced torque generated on the normally conductive squirrel-cage winding due to a rotating magnetic field and, when the superconductive squirrel-cage winding is in a superconductive state, rotations are mainly made by a synchronous torque generated by the superconductive squirrel-cage winding trapping magnetic flux of the rotating magnetic field.