To examine the basic components of an electric motor, we need to understand what causes the motor to rotate and the different types of motor. For this we must take advantage of the concepts already known about magnets, magnetic forces and sobrea force between them, you should also know about the action of magnetic fields on the chains, among others, and if necessary check on the important relationships that exist between electricity and magnetism. https://www.mrosupply.com/bearings/radial-ball-bearings/320006_6205-2rsjem_skf-bearing/
When you are studying on an electric motor it is important that in the first part, most basic, are seen just the concept of repulsion and attraction between magnetic poles, when you know a little about it there you can safely move on to a second part which is more advanced where it should study about the engine is the concept of the action of magnetic fields on the energy currents.
No need to be an expert to understand engine and see the basic components of each, just as attention to voltage and correct numbering.