As most people know, the most common cause of a burnt-out motor is overheating. So, what are the main reasons for overheating in motors? Let's take a brief look!
I. Internal causes of motor problems
1. Incorrect wiring occurred during the installation and maintenance of the motor;
2. Short circuits in the windings or between turns lead to an increase in the number of windings, resulting in an imbalance of the three-phase currents;
3. Incorrect coil connection in the phase group or uneven distribution of the number of coils per phase leads to an imbalance in the three-phase no-load current and excessive current;
4. Frictional heat is generated between the stator and rotor;
5. The motor bearings are overheating.
II. Causes of Motor Overload
1. Prolonged overload of the motor causes the stator current to far exceed the rated current, leading to motor overheating;
2. Frequent motor starts cause the motor temperature to rise excessively;
3. The motor jams and stops rotating, or its speed drops sharply, causing a rapid increase in current;
4. The motor's operating system is mismatched with the load's operating system.
III. Reasons related to environment and ventilation/heat dissipation
1. The motor's operating environment lacks proper ventilation and heat dissipation, leading to excessively high temperatures;
2. Excessive dust and grease in the motor hinders heat dissipation;
3. A damaged, deformed, loose, or improperly installed fan, or one that is not installed backwards, can lead to poor ventilation and insufficient motor heat dissipation.
The above are the main reasons why motors burn out. Hopefully, this information has been helpful. Mastering these basic principles will ensure the safe and stable operation of your motor!
