Proper maintenance on an electric motor should be done by professionals in the area. That’s because this engine must undergo necessary changes to ensure its operation. Nowadays there are even companies that are specialized in giving the correct maintenance of electric motors and it would be interesting that you examine this option of hand labor.
Maintaining the engine can be made periodically, everything will depend on which this engine is being used, this because for engines that are most frequently used of course I do not stress must also be made at a higher frequency. Be sure to be seeing this with expert professional in the field.
It is important to make an analysis of each of the machines you are using in order to reach a final result on what is the most appropriate basis for the maintenance be done. The proper professional who has worked with the electric motor may be performing this maintenance on your engine.