Stator Slot Optical Inspection with Multi-Angle Alignment
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Solution Overview
Problem
Current methods for inspecting electric motor stators, particularly stator slots, face challenges in efficiently detecting defects like burrs and geometric variations due to misalignment of laminations, which can lead to sub-optimal performance and failure.
Innovation Solution
A system and method utilizing a rotary table with an imaging device, illuminator, and tilting system to align and inspect stator slots by taking images at multiple orientations, selecting an optimal orientation based on illumination and measuring slot dimensions, and identifying deviations such as burrs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional inspection methods are used for stator slots, then inspection speed is reduced, but measurement precision and defect detection accuracy are compromised
Solution Approach 1:
The system dynamically adjusts the orientation of the stator slot relative to the imaging device by rotating the stator stack on the rotary table. This dynamic repositioning allows the imaging device to capture images at multiple orientations, ensuring that defects like burrs and geometric variations are detected with high precision regardless of their initial position, while maintaining efficient automated inspection speed
Solution Approach 2:
The inspection system transitions from single-plane imaging to multi-orientation imaging by rotating the stator slot in the rotational dimension. This adds a temporal/orientational dimension to the inspection process, allowing defects that may be hidden or ambiguous in a single view to be clearly identified through multiple angular perspectives, thereby improving measurement precision without significantly increasing inspection time
2Reliability
If multiple images are taken at different orientations, then defect detection accuracy is improved, but device complexity increases
Solution Approach 1:
The rotary table serves multiple functions: it positions the stator stack for imaging, rotates the stator slot to different orientations, and maintains precise alignment throughout the inspection process. This multi-functionality allows the system to achieve high defect detection reliability through multiple orientation imaging without proportionally increasing device complexity, as a single rotary mechanism accomplishes what would otherwise require multiple separate positioning systems
Solution Approach 2:
The system uses the stator stack itself as the mounting structure on the rotary table, eliminating the need for separate fixtures or holders. The stator stack's own geometry is utilized to facilitate rotation and positioning, reducing the number of additional components needed and thereby limiting the increase in device complexity while maintaining high inspection reliability
3Productivity
If non-contact optical inspection is used, then inspection speed is improved, but measurement precision for small defects is reduced
Solution Approach 1:
The optical inspection system maintains high productivity through non-contact imaging while dynamically adjusting the orientation of the stator slot during inspection. By rotating the stator to multiple orientations and capturing images at each position, the system enhances its ability to detect small defects like burrs that may be missed in a single static view, thereby improving measurement precision without sacrificing the speed advantages of optical inspection
Solution Approach 2:
The system replaces physical contact measurement methods with non-contact optical imaging, maintaining high inspection speed. However, it compensates for the reduced precision on small defects by introducing rotational movement to capture multiple orientations, allowing the optical system to detect small features that would be invisible or ambiguous in a single static image, thus improving precision while preserving productivity
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 quick and efficient non-contact inspection of stator slots, ensuring accurate measurements and defect detection, thereby improving manufacturing quality and preventing motor failures.
Implementation Method 1
an illuminator configured to apply illumination through the stator slot
Implementation Method 2
an imaging device configured to take a plurality of images of a portion of the stator stack
Data Source
AI summary
A system for inspecting a stator stack includes a rotary table, an imaging device configured to take a plurality of images of a portion of the stator stack including a stator slot, an illuminator configured to apply illumination through the stator slot, and an alignment and monitoring system configured to monitor and orient the stator slot relative to the imaging axis. The alignment and monitoring system includes a tilting system configured to move the stator slot between a plurality of orientations relative to an imaging axis, the imaging device configured to take a respective image at each of the plurality of orientations, a controller configured to control the tilting system based on one or more measurements of each image, and a processor configured to analyze each image and select an orientation of the stator slot as an optimal orientation for inspection of the stator slot.