FMEA & FTA of INDUCTION MOTOR

Submitted by:ANJALI SHISHODIA(12MT07IND002)ANDAADITYA(12MT07IND001)

FMEA & FTA ofINDUCTION MOTOR

Parts of induction motor

Principle of induction motor

An induction motor is a type of electric motor that converts electric power into rotary motion. An induction motor uses the principle of electromagnetic induction to cause the rotor to turn.

Working of induction motor

Electric current is supplied to the stator, which induces a magnetic field that rotates. The rotating magnetic field interacts with the rotor, inducing current in the rotor. The interaction of the two magnetic fields results in a torque, turning the rotor within the motor casing. Because the induction motor does not use brushes like DC motors, there is less wear of the internal parts.

Components /part name function Potential failure mode Potential failure effects Severity Potential causesOccurrences Current process control DetectionRPN Action recommended Resp & target dateAction takenseverityoccurrencesdetectionNEW RPN STATOR FRAME Having slots in it Used to host stator windings corrosionCasting defectInoperability of the motorBreakage /cracking of frame7Improper material used for the frame36126Manufacture mechanically sound frame554100STATOR WINDINGSWhen electric current is supplied to stator creates a magnetic field.Excessive 3 phase AC supply

Windings may burn short circuiting8Improper resistance of windings48256Verify resistance are correct or not.Proper no of turns--565150ROTORThis induces an opposing current in the induction motor's rotor.Improper Air gap b/w rotor and stator Interaction of magnetic field will not occur8foreign material like dirt ,dust , oil ,water3-8192Ventilation should be proper--665180ROTOR WINDINGSThe currents in the rotor windings in turn create magnetic fields in the rotor that react against the stator field. Overheating, arcing, burningNo torque generation

Rotor will not accelerate8 improper insulation resistance b/w each winding and frame48256Verify resistance are correct or not.Proper no of turnsCheck visually for overheating ,burning etc--756210BEARINGSAllow free rotation of the rotor within the stator.Play in bearingsExcessive friction Resulting in wear and tear

No free rotation7Improper size of bearing

Lack of lubrication37147Properly rounded or notShould be no problem in sizes546120FAN BLADESTo circulate air b/w the stator and rotorBending ,inclinedAir is not properly circulated7Connection some times may not be proper45140Check wires are properly connected or not636108s

FAULT TREE ANALYSIS

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