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Induction motors, a critical component of industrial and residential applications due to their robustness and simplicity, experience various types of losses during operation. These losses are essential to understand for efficiency improvement, design optimization, and operational cost reduction. The losses in induction motors are generally categorized as follows:
1. Stator Losses:
– Copper Losses (Stator Winding Losses): Power lost as heat in the stator windings due to the resistance of the windings when current flows through them.
2. Rotor Losses:
– Copper Losses (Rotor Winding Losses): Similar to stator copper losses, these occur in the rotor windings (in squirrel cage motors, these are sometimes referred to as “aluminum” losses due to the common use of aluminum for the rotor conductors).
– Slip Losses: A portion of the power is lost as slip, which is the difference between the synchronous speed of the magnetic field and the actual speed of the rotor.
3. Core Losses (Magnetic Losses):
– Hysteresis Losses: These losses result from the lagging of the magnetic domains behind the alternating magnetic field inside the motor core, leading to energy dissipation as heat.
– Eddy Current Losses: Induced currents in the core (due to the alternating magnetic field) flow in closed loops within the iron of the motor core, producing heat
Answer: c
Explanation: There are 5 losses present in the induction motor. They are i) Stator copper losses, ii) Rotor copper losses, iii) Stator iron losses, iv) Friction and winding losses, v) Additional losses.