In order to realize efficient and accurate detection of the pitch bearing tooth surface of wind turbines in service under the adhesion of high viscosity lubricating grease

profiling array eddy current technology is used to study the effects of different coil arrangement methods and lifting distances on the detection results of bearing tooth surface defects. It can be concluded that

the edge effect range of Z-shaped and composite coil layout is different

and the composite profiling probe is significantly shorter than the Z-shaped probe. By detecting the artificial groove defects of 10.00 mm×0.50 mm×1.00 mm(slot length × slot width × slot depth)

it indicates that the lifting distance limits for inner and outer toothed bearings are 1.04 mm and 1.43 mm

respectively.Experimental verification is conducted on the in-service fan bearings under the condition of high viscosity lubricating grease on the surface

and the results of defect size and position detection are accurate

with an error of less than 5%. This provides technical support and new ideas for supervision and inspection of the pitch bearing gear tooth surface in service.