Rotating Electrical Machine Stator with Removable Axial Teeth
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Solution Overview
Problem
Existing rotating electrical machines face challenges in maintenance, particularly in replacing defective stator teeth without dismantling the rotor, due to complex and invasive procedures.
Innovation Solution
The design features a stator with removable teeth that can be extracted axially, allowing for the replacement of defective teeth with new ones using a method that includes disconnection of windings, release of tooth attachments, axial extraction, and re-attachment of new teeth, all without disassembling the rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator teeth are fixed firmly to the frame, then the structural stability is improved, but the maintenance complexity increases and tooth replacement becomes difficult
Solution Approach 1:
The stator is segmented into modular components: the frame, removable teeth, and windings. Each tooth can be independently removed and replaced without affecting other teeth or requiring rotor disassembly. The removable attachment mechanism (screws or pins) enables this segmentation, allowing maintenance personnel to access and replace individual defective teeth easily while maintaining structural integrity during operation.
2Reliability
If the windings are interlocked between teeth, then the magnetic flux concentration is improved, but the tooth extraction complexity increases
Solution Approach 1:
The windings are extracted from the interlocked configuration and repositioned to rest on top of the teeth. This extraction simplifies the tooth attachment design, allowing teeth to be secured to the frame with simple removable attachments (screws or pins) without complex winding integration. The windings remain in place during tooth removal and can be easily repositioned when new teeth are installed, reducing extraction complexity while preserving magnetic flux concentration through proper winding placement.
3Manufacturing precision
If the stator is designed as an integrated unit, then the manufacturing precision is improved, but the maintenance time increases
Solution Approach 1:
The stator transitions from a static integrated unit to a dynamic modular structure where teeth can be independently removed and replaced. The removable attachment mechanism (screws or pins) enables this dynamic reconfiguration, allowing quick access to individual teeth without disassembling the entire stator or rotor. This dynamic design reduces maintenance time significantly while maintaining manufacturing precision through standardized tooth and frame interfaces that ensure proper alignment and fit during reassembly.
Data Source
Figure 1~2
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AI summary
The machine (1) has a stator (5) including a yoke (17) with a cylindrical shell (23) that is coaxial to a central axis (X) of a rotor (3). Axial teeth (19, 20) are arranged around the central axis. Windings (21) are arranged around the teeth. The stator includes a removable fixing unit for fixing each tooth to the shell of the yoke. The stator is arranged in a manner such that each tooth is extracted out of the stator with the winding along axial movement after release of the fixing unit and disconnection of one of the windings from the other windings. An independent claim is also included for a process for replacing defective teeth of a stator in an electrical machine.