A 120 V, 60 Hz, single-phase induction motors 1 and 2 are connected in parallel. Motor 1 takes a current of 4 A at 0.8 PF lagging and the total current taken from the supply is 10 A at 0.6 lagging. Calculate the current and the PF of motor 2.

A 120 V, 60 Hz, single-phase induction motors 1 and 2 are connected in parallel. Motor 1 takes a current of 4 A at 0.8 PF lagging and the total current taken from the supply is 10 A at 0.6 lagging. Calculate the current and the PF of motor 2.

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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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

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