Crack Detection

Poor quality magnets can have small cracks that can break during assembly or that can lead to product failure over time. Re-work or worst case scrapping of the assembled product can be very costly. Being able to screen out small cracks in magnets can improve product yield and reduce cost. Both visible and just-below surface cracks can be identified using the Magcam systems. MagFit can filter out the signature of cracks from the background field distribution and automatically detect small cracks. By comparing the measured data with theoretical magnet models, MagFit extracts a lot of extra information from the data.

The Magcam technology can be used to detect cracks quickly and accurately in permanent magnets, magnet assemblies and rotors. Magnet manufacturers are using our solutions to screen out cracked magnets in automated production lines.

Minimum detectable crack length is ~ 0.5mm

Magnet quality issue:

• Small cracks that can cause premature product failure

Magcam analysis:

• Bz field distribution
• Substract background field (using MagFit analysis)
• Image processing
• Threshold residual field
• Object recognition
• Detect cracks