A highly inductive load draws 10kW at 0.75 lagging power factor, connected in parallel to this load is a synchronous motor being operated at 0.9 leading power factor. Solve the minimum size in kW of the synchronous motor that will make the combined load have a lagging power factor of 0.8.

A highly inductive load draws 10kW at 0.75 lagging power factor, connected in parallel to this load is a synchronous motor being operated at 0.9 leading power factor. Solve the minimum size in kW of the synchronous motor that will make the combined load have a lagging power factor of 0.8.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...

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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.

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