7 Motor Parts and Their Common Faults

Understanding common motor problems is an important aspect when it comes to understanding engineered products or machinery. This comes in handy in many unfavorable situations, so one can define the appropriate solution and protective measure for such faults and mishaps. This also makes it important to understand various important terms related to assessing the parts and the working structure of your motors even during onsite testing of motors.

cut away view of an electric motor
Cut Away View of an Electric Motor (Credit: Wikimedia commons)

Here we have noted down

Some common motor problems caused by certain parts


This mechanical component in your motor is basically used to transmit torque and rotation. Shaft misalignment is the most common problem when it comes to this particular part. This will destroy your bearings before their complete working life. Analyze your motors through a vibration measurement procedure and check the force and the load that your motor is put through when they are running to avoid wear and tear.


Rotor elements can likewise help decide the reason for untimely gear disappointment. A fan's exhibition can be influenced by typical wear. On the off chance that appropriate protection support isn't executed, rotors may turn out to be slim and ultimately break.


On the off chance that you sense that your motor comes up short on the force it once had, or it's increasingly hard to begin, test your source coils. It is doubtlessly going to bite the dust. While you test it, you may need to likewise test your pick-up coil, as it could be failing as well. The actual stator may be dead and isn't sending any current to the battery. Never forget to replace your stators connectors. A bad connection generates heat, and heat fries the connector, making a short circuit that may burn your stator and other electrical parts.

Bearing Issues

In the three-phase machine, two sets of bearings are installed within the engine lodging, for supporting the machine shaft. They comprise an external and inward ring which is called races and a bunch of moving components which are called bearings. The bearing balls, both external and internal ring are damaged because of which the motor completely jams or gets struck. Bearing issues can also be checked by vibration measurement.

Insulation Brakdown

The most regular disappointment in electrical hardware is the degradation and breakdown (flashover) of the insulation. Natural protection material comprises enamels, resins, varnishes, or polymers that are applied to the steel surface to give high inter-laminar (between windings) resistance as found on most air-cooled apparatus and some oil-submerged transformers.

Hipot test

Another form of Electric Motor Testing is A hipot (high potential) test, additionally called a dielectric strength test, which checks for shortcomings in the link or wire protection. To play out this test, you apply flow between the electrical circuits and the edge. Note that particular overvoltage levels applied are subject to the motor and its predetermined voltage.

During this type of electric motor testing, you measure the overflow of current and figure the comparing mega-ohms even during onsite testing of motors. Zones with lower or higher than recommended mega-ohm readings have damaged protection.

Motor winding resistance

The objective of an machine winding test is a disconnected test used to find winding issues. You ought to play out this test at whatever point you see breaks or burns, or if you've noticed a burning smell coming from the machine. You will begin by clearing off the windings with shop air and investigating them. Then, set the multi-meter to midrange and design it to gauge resistance in ohms, at that point contact the leads together to confirm that the reading is 0 ohms.