What is the proper practice when inspecting field pole pieces for signs of wear or damage?

• A. Inspect, clean, and replace if damaged.
• B. Ignore minor dents.
• C. Only inspect if the machine is offline.
• D. Apply sealant to the surfaces.

Answer: (A)

Regular maintenance of field pole pieces is essential to keep the magnetic path consistent and prevent overheating or vibration. The proper practice is to inspect, clean, and replace if damaged. Cleaning exposes the true surface condition so you can accurately assess wear or deformation. Look for dents, pitting, cracks, gouges, corrosion, or bent edges on the pole faces and mounting surfaces. If any damage is found, replace the pole piece rather than attempting to repair it, since even small flaws can cause uneven flux, excessive heat, or arcing. Don’t ignore minor dents, as they can indicate more serious issues. Inspections should be part of routine maintenance and not limited to offline periods, and applying sealant to the pole surfaces is inappropriate because it can interfere with the magnetic contact and cooling.