Superconducting Stator Winding Design for Loss Reduction
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Solution Overview
Problem
Conventional superconducting rotating electrical machines with normal-conductive stators face inefficiencies due to copper, iron, and eddy current losses, which cancel out the benefits of a superconducting rotor, making it difficult to achieve high power conversion efficiency while maintaining cost-effectiveness.
Innovation Solution
A stator design with a high-density arrangement of rectangular cross-section wires, where each winding is constructed by winding a strip-like wire member multiple times with diametrically opposed portions twisted and overturned, and electrically connected in a manner that cancels out eddy currents, achieving a wire-area ratio of 55% or more, thereby minimizing copper and eddy current losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a normal-conductive stator is used in a superconducting rotating electrical machine, then manufacturing cost is reduced, but power conversion efficiency decreases due to copper and eddy current losses
Solution Approach 1:
The patent changes the physical parameters of the stator windings by using rectangular cross-section wires instead of conventional circular wires, and arranging them in a high-density configuration with a wire-area ratio of 55% or more. This parameter change reduces the copper loss and eddy current loss in the normal-conductive stator, thereby improving power conversion efficiency while maintaining cost-effectiveness
Solution Approach 2:
The patent employs a composite winding structure combining rectangular cross-section wires with specific electrical insulation arrangements. The combination of conductive rectangular wires and insulating materials creates a optimized configuration that minimizes energy losses while maintaining manufacturing feasibility
2Loss of energy
If the wire-area ratio is increased to 55% or more, then copper loss and eddy current loss are minimized, but the complexity of winding arrangement increases
Solution Approach 1:
The patent segments the stator windings into multiple rectangular cross-section wires arranged in a systematic high-density configuration. By dividing the winding into multiple discrete rectangular conductors with specific insulation arrangements, the design achieves a wire-area ratio of 55% or more while maintaining manageable complexity through standardized segmentation patterns
Solution Approach 2:
The patent transitions from conventional circular cross-section wires to rectangular cross-section wires, utilizing the rectangular geometry to achieve higher packing density. The rectangular shape allows for more efficient space utilization in the stator slots, enabling the wire-area ratio to reach 55% or more with a more systematic arrangement
3Loss of energy
If rectangular cross-section wires are used with high-density arrangement, then power conversion efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates preliminary insulation arrangements between the rectangular cross-section wires during the winding preparation stage. By pre-establishing the insulation structure and wire positioning before final assembly, the manufacturing process achieves the required precision for high-density rectangular wire arrangements while maintaining efficiency in the overall manufacturing process
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
This design significantly improves power conversion efficiency in superconducting rotating electrical machines with a superconducting rotor and normal-conductive stator, achieving a high efficiency of 98% by minimizing copper and eddy current losses, thus eliminating the need for a superconducting stator and reducing manufacturing costs.
Implementation Method 1
a superconducting rotating electrical machine, in which superconducting property is provided to the rotor and the stator by forming the armature windings using the superconducting wires
Implementation Method 2
magnetic fluxes generated by an application of electric current to the windings
Implementation Method 3
magnetic fluxes generated by an application of electric current to the windings are concentrated in the core to increase the intensity of magnetic field and a resultant rotational force
Implementation Method 4
the core is made by stacking a plurality of thin plates each covered by a suitable electrically insulating material. In order to reduce eddy current caused by the change of magnetic flux
Data Source
Figure 1~2
Figure 3A~3D
Figure 4
AI summary
A superconducting rotating electrical machine has a rotor with superconducting windings and a stator disposed around the rotor. The stator has a number of teeth disposed at a regular interval about a rotational axis of the rotor to define slots each between adjacent teeth and a plurality of windings, each winding having a strip-like wire member, the wire member having a plurality of rectangular cross-section wires in which said rectangular wires are arranged in parallel to each other and electrically insulated away from each other, the winding being constructed by winding the strip-like wire member a plurality of times to have first and second winding portions having a cross section in which the rectangular wires are positioned in matrix. The first and second winding portions have the same arrangement of wires in a cross section perpendicular to the rotational axis. The first winding portion is disposed in an outward region of one of the slots and the second winding portion is disposed in an inward region of another of slots corresponding to the one slot.