One of the extra steps we can perform at HECO when performing repairs, maintenance, or rebuilds on your electric motors is magnetic degaussing. While some may feel this step is unnecessary, experience has taught us that it can help prolong the life of your bearings and your motor!
Why Magnetic Degaussing of Motor Components is Important
You may be wondering why magnetism is an issue -- are motors all about electromagnetism and currents? It's true that AC electric motors experience magnetic induction via an electromagnetic field in the motor windings. However, we're talking about a different type of magnetism: one that can damage your motor instead of make it turn.
The type of magnetism that is a source of concern would be, for example, placing a metal screwdriver against the end of the motor shaft and having it remain in place when you remove your hand. That is the kind of magnetism that causes problems. More specifically, magnetized components parts can result in bearings that appear to have been subjected to shaft circulating currents and static discharge -- and these can cause serious damage to motor bearings.