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Examoogle • User • info@examoogle.com • EE-2024-8821
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The rotor copper losses of the synchronous motor is met by
Armature input
Ac supply mains
Dc source
All of these
Dc source
The rotor copper losses in a synchronous motor are primarily met by a DC source, which provides the necessary excitation to the rotor, enabling it to maintain synchronism with the rotating magnetic field. This is essential for the motor's operation and efficiency.
The rotor copper losses in a synchronous motor are primarily met by a DC source, which provides the necessary excitation to the rotor, enabling it to maintain synchronism with the rotating magnetic field. This is essential for the motor's operation and efficiency.
Ploss=I2R — Copper loss in the rotor
E=V⋅I∗ — Effective power equation
In a synchronous motor, the rotor is supplied with direct current through slip rings, which generates a magnetic field. This magnetic field interacts with the stator's rotating magnetic field, causing the rotor to turn at synchronous speed. The copper losses, which are the result of resistance in the rotor winding, are compensated for by this DC excitation, ensuring effective performance.
Rotor copper losses occur due to the resistance of the rotor windings when current flows through them.
Maintaining a consistent DC supply is crucial for synchronous operation and minimizing losses.
Stable operation at synchronous speed.
High efficiency due to low slip.
Requires a DC source for excitation.
Complex control system needed for varying loads.
Used in synchronous generators for power plants.
Applicable in elevating systems and industrial drives.
Standard excitation voltage ranges for synchronous motors are typically between 120V to 250V.
Option A is incorrect because armature input does not directly compensate for copper losses; rather, it contributes to overall power input.
C is correct — The rotor copper losses of a synchronous motor are compensated by the DC source which provides necessary excitation.
Understand the role of excitation in the operation of synchronous motors, as this concept also applies to synchronous generators.