Superconducting Machine Stator Winding Reconfiguration
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Solution Overview
Problem
Superconducting machines in island networks face operational challenges when the cooling system fails, as the excitation winding overheats, preventing operation at rated current, and existing solutions like additional diesel units are costly and less attractive.
Innovation Solution
The implementation of at least two parallel winding elements on the stator, which can be connected in series or parallel via a switching means, allowing for reduced excitation current operation and maintaining nominal voltage in emergency modes, even at higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling system fails, then the superconducting coil temperature rises above operating temperature, but operation with rated current is no longer possible
Solution Approach 1:
The armature winding is designed with dynamic reconfigurability, allowing the connection topology to change from parallel to series based on operating conditions. This dynamic adaptation enables the system to maintain functionality across different temperature ranges and cooling system states, resolving the contradiction between reliability and rated power operation.
Solution Approach 2:
The invention changes the electrical parameters of the armature winding by altering the connection configuration (parallel to series), which changes the voltage and current characteristics. This parameter change allows the machine to operate at reduced current with higher voltage when the cooling system fails, maintaining some power output while adapting to elevated temperatures.
2Duration of action of moving object
If an additional diesel unit is provided as emergency power supply, then power can be provided for auxiliary equipment over longer period, but device complexity and cost increase
Solution Approach 1:
The superconducting machine itself provides the emergency capability through its reconfigurable armature winding, eliminating the need for external emergency power sources. The system serves its own emergency needs by internally adapting its electrical configuration, thereby extending operational duration without increasing device complexity.
Solution Approach 2:
The armature winding serves multiple functions: it operates in parallel configuration for normal rated power generation and in series configuration for emergency reduced-power operation. This multi-functionality allows a single component to handle both normal and emergency conditions, eliminating the need for separate emergency power systems.
3Temperature
If winding elements are connected in series, then voltage increases with reduced excitation current, but power generation capability decreases
Solution Approach 1:
The connection configuration of the armature winding is made dynamic, allowing switching between parallel and series connections based on the cooling system status and temperature conditions. This enables the system to adapt its power generation capability to match the available excitation current at different temperatures, optimizing the balance between temperature tolerance and power output.
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
Enables continued operation of the superconducting machine at reduced power with nominal voltage, extending emergency operation and reducing the need for additional costly generators, thus enhancing operational reliability and reducing circuitry complexity.
Implementation Method 1
at least one superconducting coil for generating at least two magnetic poles being provided on at least one component
Implementation Method 2
the superconducting machine, in particular the rotor is cooled by a cooling device
Data Source
Figure 1~2
Figure 3~4
AI summary
A superconducting machine is disclosed, in particular for use as a generator in a stand-alone power system. In at least one embodiment, the superconducting machine includes a stator and a rotor capable of rotating with respect to the stator. At least one superconducting coil for generating at least two magnetic poles is provided on at least one component part, in particular the rotor, which superconducting coil is cooled via a cooling device; and at least two parallel winding elements are provided on the respective other component part, in particular the stator, in the armature winding for each phase, which winding elements can be connected either in series or in parallel via at least one switching device.