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Abnormal Operating Condition and Causes of Induction Motors

Abnormal Operating Condition and Causes of Induction Motors

Three phase induction motors are used on a large scale in industries. We may divide the abnormal conditions and causes of three phase motor this way.
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Abnormal Operating Condition and Causes of Induction Motors
Abnormal Operating Condition and Causes of Induction Motors (Photos by Siemens)

following are the Abnormal Operating Condition and Causes of Induction Motors

Mechanical Overload
  • Block the pump or gear system connected with motors
  • Damaged bearings or No Lubrication
  • Lock rotor or more time to starting the motor
  • Stalling the motor (When motor does not start due to heavy load)
  • In this case, motor is disconnected from supply as well as from mechanical load. After that, motor is started to satisfy the mechanical overlord condition.
Abnormal Supply Conditions
  • Low Supply Voltage
  • Unbalance supply voltage
  • Increase in Supply Voltage
  • Low Frequency (than normal frequency)
Faults in Supply Circuit
  • Not availability of three phases
  • Short circuit in supply cable
  • Damaged links of the contactor
  • Melted Fuse
Internal Faults in Motor
  • Phase to Phase faults
  • Phase to Earth faults
  • Open Circuit
  • Bad Insulation of The motor windings (in this case, motor is checked with megger)
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4 comments

  1. *Order* an H-bridge? I made one myself last night from raw tronsistars. Well I think I did. I made an H-bridge simulator anyway. It only lights LEDs so far. Also, I’ll probably blow out the tronsistars since I don’t know how to read the datasheet well enough to see what max current they’ll take.

  2. Why induction motor is not run on synchronous. Speed?

  3. kindly explain how much check insulation resistance and phase to phase resistance?
    kindly tell us formula to check resistance by varios motors.

  4. usefull information about us

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