Generator Air-Gap Inspection Vehicle for Unilateral Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inspection methods for generators require disassembly of the rotor and stator for visual inspection, which is complex and costly, and existing inspection vehicles cannot access the air gap between the rotor and stator in generators with unilateral access, limiting their applicability.
Innovation Solution
An inspection vehicle with pivotable traction groups and a camera system that allows for remote-controlled, wireless operation, enabling movement and steering in all directions within the air gap, allowing inspection without rotor disassembly and accommodating unilateral access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional crawler system is used for inspection, then the inspection vehicle can travel across the rotor, but it cannot be repositioned in the circumferential direction and requires manual intervention
Solution Approach 1:
The traction groups are made dynamically reconfigurable through a pivotable intermediate element that can rotate about a pivot axis. This allows the inspection vehicle to automatically reposition in the circumferential direction by pivoting the intermediate element, eliminating the need for manual intervention while maintaining operational simplicity
Solution Approach 2:
The vehicle body is divided into separate functional modules: the housing containing inspection technology, the intermediate element for circumferential repositioning, and multiple traction groups for axial movement. This segmentation allows each module to perform its specific function independently, enabling automatic repositioning without increasing overall operational complexity
2Ease of operation
If the rotor is extracted for inspection, then visual access is enabled, but the process becomes complex and costly
Solution Approach 1:
The inspection vehicle is extracted or inserted into the air gap between the rotor and stator without requiring disassembly of the generator. The vehicle travels on the rotor's external circumference and can inspect both the rotor's external circumference and the stator's internal circumference while the generator remains assembled, eliminating the complex and costly extraction procedure
Solution Approach 2:
The inspection vehicle acts as an intermediary device that accesses the air gap between the rotor and stator. It carries inspection technology (cameras, sensors) into the confined space where direct visual access is not possible, enabling inspection without disassembly by mediating between the inspection requirement and the assembled generator structure
3Adaptability or versatility
If unilateral access at 12 o'clock position is available, then the generator structure is simplified, but existing inspection vehicles cannot access the air gap
Solution Approach 1:
The inspection vehicle is designed with asymmetric access capabilities, entering through the unilateral 12 o'clock position access point and then using its pivotable intermediate element to reposition circumferentially. This asymmetric design allows it to adapt to generators with limited access points while maintaining full inspection capability across the air gap
Data Source
AI summary
An inspection vehicle which is designed to be inserted into the air gap between a rotor and a stator of an electrical machine, in particular of a generator, and to be moved on the substantially cylindrical outer circumference of the rotor in order to inspect the outer circumference of the rotor and/or the inner circumference of the stator for damage.