The rotor impedance of a three-phase, 50 Hz, 1460 rpm, star-connected ring ASM is (0.1+J1.5) Ω and the stator impedance (0.22+J0.35)Ω . With the rotor at rest, the voltage measured between the rings is 90 V. Wind and friction losses of the motor are 350 W. Accordingly, find the copper losses in the rotor when the motor is running at full load.
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
The rotor impedance of a three-phase, 50 Hz, 1460 rpm, star-connected ring ASM is (0.1+J1.5) Ω and the stator impedance (0.22+J0.35)Ω . With the rotor at rest, the voltage measured between the rings is 90 V. Wind and friction losses of the motor are 350 W. Accordingly, find the copper losses in the rotor when the motor is running at full load.
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