State four abnormalities that taking place in case of motors.

State four abnormalities that taking place in case of motors.
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1 Answer

Answer :

Abnormalities that Taking Place in Case of Motors:

A) Electrical / magnetic sections:

1) Electrical supply failure due to single phasing, under voltage, unbalanced voltages and reversal of phases.

2) Short circuit faults between turns of a stator / rotor winding due to failure of insulation.

3) Short circuit faults between stator / rotor winding due to failure of insulation.

4) Short circuit faults between stator coils and body of motor due to failure of insulation.

5) Open circuit in stator winding / rotor winding or their terminal connections.

6) Loose or broken rotor winding.

7) Damaged core stampings / teeth.

8) Prolonged loading, improper loading, stalling, loss of synchronism etc.

B) Mechanical section:

1) Unbalanced rotor.

2) Damaged bearings.

3) Grooved slip rings.

4) Worn out brushes leading to abnormal operation with sparking etc.

5) End play in shaft, bent shaft.

6) Cooling / ventilation system failures, damaged fan.

7) Failure / disturbances of alignment.

8) Foundation arrangement disturbed.
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