When a motor burns out, is it usually the stator or the rotor that gets damaged

When the motor burns out, both the stator and rotor may be damaged due to the following factors:; 1. Electrical faults are more likely to burn the stator: overload/short circuit, abnormal voltage, insulation damage; 2. Mechanical failures often lead to rotor damage: bearing problems, foreign objects entering; 3. Other common influencing factors: poor heat dissipation and ineffective protection.

When a motor burns out, both the stator and rotor may be damaged, but the extent of damage depends on the following factors:

Electrical faults are more likely to burn out the stator
Overload/Short Circuit: When a motor is subjected to prolonged overload or stator winding short circuits, the current directly impacts the stator, causing it to burn out.
Voltage abnormality: When the voltage is too high or phase loss occurs, the stator winding bears excessive current, which can easily lead to burning out.
Insulation damage: The breakdown of the insulation layer in the stator winding can lead to short circuits, typically affecting the stator first.

Mechanical failures often cause damage to the rotor
Bearing issue: When the bearing is worn or inadequately lubricated, the rotor and stator may rub against each other, potentially burning out the rotor.
Foreign object intrusion: Foreign objects or metal debris entering the motor may directly damage the rotor or stator windings.

Other common influencing factors
Poor heat dissipation: Excessive heat can cause damage to both the stator and the rotor.
Protection failure: Delays in the operation of circuit breakers or thermal relays may result in the burning out of core components.

Summary: Electrical faults (such as overload, short circuit, and voltage anomalies) are more likely to cause stator burnout, while mechanical faults (such as bearing damage and foreign object intrusion) primarily affect the rotor. In actual cases, both may be damaged simultaneously, requiring analysis based on specific fault symptoms.

Key words:

stator,rotor,bearing,motor,insulation

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