Dust and moisture are two electric motor enemies
In designs of vacuum cleaners and liquid cleaners is ideal that the ball hard bearings offer the electric motor protection in the face of possible contamination by dust coming from the brushes or also the moisture entering the interior of the electric motor.
When infecting the electric motor is dust brushes, bearings earn metal shields which are incorporated along with a special design of the maze. All this to keep the interior free of dust electric motor dodge p2b gtah 100.
In locations where moisture becomes the problem for the electric motor, the project has rubber seals with heavy contact.
When the electric engine must operate at high speed, the radial internal clearance is optimized and also is selected grease to be able to handle the electric motor operating conditions.