When choosing bearings for small electric motors, internal clearance is one of the most misunderstood yet important factors. It may seem like a small detail, but the wrong clearance can cause overheating, noise, or premature failure. Let’s break it down in a practical, easy-to-understand way.
What Is Bearing Clearance?
Internal clearance (radial internal clearance) is the total amount one ring can move relative to the other before installation. In simple terms: It’s the “looseness” or play inside the bearing when it’s still in your hand.
Why Clearance Matters So Much in Small Motors?
After installation, the actual running clearance changes due to:
• Interference fits on the shaft and housing
• Thermal expansion during op...
