A motor is a stationary part, a rotating part, bearings that let it rotate, and a shaft that takes the motion out.
Motor faults come in two families -- electrical and mechanical -- and naming the parts is how you stop treating every motor problem as a wiring problem.
Look at the exploded view and sort the parts by what could go wrong with each. The stator is windings, so its failures are electrical. The bearings are mechanical and wear out. The rotor and shaft sit between the two. A motor that will not turn could be a winding fault or a seized bearing, and those are different problems with different answers.
Check yourself: A motor is running badly. Is it an electrical fault?
Answer: Not necessarily. Electrical and mechanical problems can both affect motor operation.
The motor is both kinds of machine at once. Electrical energy goes in and mechanical motion comes out, so a fault anywhere in that chain shows up as the motor running badly.
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Written from the owner's poster for this lesson. Nothing added beyond what the poster states.
Written for Texas apprentices as free study material. The Texas apprentice licence is an application, not an exam (Occupations Code 1305.161), and nothing here counts as apprenticeship hours or continuing-education credit. VoltMark is not affiliated with, endorsed by, or sponsored by NFPA, PSI, TDLR, or any state or local licensing authority. Always follow your employer's safety programme and your supervising electrician.
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