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Which loss occur in induction motor?
Core loss
Copper loss
Mechanical loss
All of above
All of above
An induction motor experiences several power losses during energy conversion, which are classified into fixed and variable losses. These include magnetic (core) losses, electrical (copper) losses, and rotational (mechanical) losses, all of which contribute to the difference between input power and output shaft power.
An induction motor experiences several power losses during energy conversion, which are classified into fixed and variable losses. These include magnetic (core) losses, electrical (copper) losses, and rotational (mechanical) losses, all of which contribute to the difference between input power and output shaft power.
PcoreтАЛ=PhysteresisтАЛ+Peddy┬аcurrentтАЛ тАФ Represents fixed magnetic losses
PcopperтАЛ=I2R тАФ Represents I2R ohmic losses in windings
╬╖=PinputтАЛPoutputтАЛтАЛ=PoutputтАЛ+тИСLossesPoutputтАЛтАЛ тАФ Definition of motor efficiency
Core losses (hysteresis and eddy currents) occur in the stator and rotor iron due to changing magnetic fields. Copper losses (I2R) occur due to the resistance of stator and rotor windings when current flows. Mechanical losses are primarily due to friction at bearings and windage (air resistance) caused by the rotating parts.
Core losses are generally considered constant at a given frequency and voltage.
Copper losses are load-dependent, increasing with the square of the stator/rotor current.
Mechanical losses are constant at a given speed.
Stray load losses also occur in addition to these primary losses due to harmonic fluxes and leakage flux.
High efficiency compared to other load-dependent systems
Self-starting capability (in 3-phase induction motors)
Losses limit the maximum capacity of the motor
Heat generation due to losses necessitates cooling systems
Industrial machinery
HVAC pumps and blowers
Core loss = Hysteresis loss + Eddy current loss.
The total power input to the motor is converted into mechanical output plus the total of all these losses.
D is correct тАФ The total power loss in an induction motor is the sum of core losses, copper losses, and mechanical losses.
In competitive exams, always remember that 'fixed losses' (core + mechanical) are often grouped separately from 'variable losses' (copper) when calculating efficiency at varying load conditions.