Electric Machine Stator Segment Exchange Using Non-Magnetic Distance-Element
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Solution Overview
Problem
The existing methods for exchanging stator or rotor segments in electrical machines, especially those with permanent magnets, face challenges such as magnetic forces causing damage during segment exchange and the need for heavy machinery, which is impractical for on-site repairs or maintenance.
Innovation Solution
The use of non-magnetic, flexible distance-elements, such as nylon, arranged in the air-gap between the rotor and stator allows for contactless movement and assembly/disassembly, preventing accidental contact and enabling easy segment exchange without requiring large machinery, allowing for on-site repairs and reducing the need for complete machine disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy machinery is used to overcome magnetic forces during stator segment exchange, then the segment can be moved without touching permanent magnets, but the complexity and cost of the repair process increases significantly
Solution Approach 1:
A non-magnetic intermediary tool is introduced between the stator segment and permanent magnets to counteract magnetic forces during segment exchange. This tool acts as a mediator that allows the segment to be moved without direct contact with permanent magnets, eliminating the need for heavy machinery while preventing damage.
Solution Approach 2:
The harmful magnetic force is extracted and counteracted by the non-magnetic tool, separating the problematic magnetic interaction from the segment exchange process. This allows the segment to be moved independently without being constrained by the magnetic attraction to permanent magnets.
2Manufacturing precision
If the rotor is dismantled to exchange stator segments in radial direction, then precise positioning can be achieved, but the time and complexity of the repair process increases
Solution Approach 1:
The stator segment is designed to be self-positioning through its interaction with the non-magnetic tool and the magnetic forces of the permanent magnets. The segment automatically aligns and positions itself during the exchange process without requiring rotor disassembly, achieving precise positioning while reducing repair time.
3Reliability
If complete stator exchange is performed instead of segment exchange, then reliability is ensured, but the loss of time and resources increases significantly
Solution Approach 1:
The stator is divided into separate exchangeable segments that can be individually replaced without affecting the rest of the stator structure. This segmentation allows only the defective segment to be exchanged, maintaining machine reliability while significantly reducing the time and resources required compared to complete stator replacement.
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 method allows for safe and efficient exchange of defective segments without damaging permanent magnets, facilitating on-site maintenance and reducing the complexity and cost of repairs by enabling segment-by-segment replacement and minimizing the need for heavy machinery and extensive transport.
Implementation Method 1
the magnetic forces of the permanent magnets attract the stator segment towards them
Data Source
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AI summary
The invention describes a method and an arrangement for the exchange of a segment in an electric machine. According to the invention an electrical machine is assembled or disassembled, which comprises a rotor and a stator. The stator and the rotor are arranged in relation to each other to achieve a predetermined air-gap between the rotor and the stator. The electrical machine is assembled or disassembled whereby a distance-element is arranged in the air gap in a way that the rotor and the stator are contactless movable in relation to each other while the machine is assembled or disassembled.