A 25kW Shunt Generator has armature resistanceof 0.50 and field resistance 1500 generatesterminal voltage of 250 V at full load. The iron,friction and windage losses are 800W. i) Estimatethe total losses in a generator. ii) Calculate theefficiency of the generator.

25kW shunt generator Armatures and fiedl resistance are given Find the total losses and efficiency…

A 25kW Shunt Generator has armature resistanc of 0.50 and field resistance 1500 generates erminal voltage of 250 V at full load. The iron, riction and windage losses are 800W. i) Estimate he total losses in a generator. i) Calculate the fficiency of the generator.

A 25kW Shunt Generator has armature resistanc of 0.50 and field resistance 1500 generates erminal voltage of 250 V at full load. The iron, riction and windage losses are 800W. i) Estimate he total losses in a generator. i) Calculate the fficiency of the generator.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter54: Variable-frequency Mechanical Drives

Section: Chapter Questions

Problem 4SQ

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

A 25kW Shunt Generator has armature resistance
of 0.50 and field resistance 1500 generates
terminal voltage of 250 V at full load. The iron,
friction and windage losses are 800W. i) Estimate
the total losses in a generator. ii) Calculate the
efficiency of the generator.

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