Question 1: Why did we perform the no-load operation experiment for the asynchronous motor? Question 2:Why is the value of Cos phi small at no-load? Question 3: Find the cupper (Pcu), iron (Pfe) and frictional (Pfri) losses at no-load operation. What happens to cupper loss? Explain. Question 4:ls the calculated value of the Cos phi same with the measured value of Cos phi? Explain the reason if not. Question 5:Are the starting currents different for Y and A connections? Explain. Question 6:State your final observations about the experiment. Question 1: Why did we perform the no-loadoperation experiment for the asynchronous motor?Question 2:Why is the value of Cos phi small atno-load?Question 3: Find the cupper (Pcu), iron (Pfe) andfrictional (Pfri) losses at no-load operation. Whathappens to cupper loss? Explain.Question 4:Is the calculated value of the Cos phisame with the measured value of Cos phi? Explainthe reason if not.Question 5:Are the starting currents different for Yand A connections? Explain.Question 6:State your final observations about theexperiment.

Answered: Question 1: Why did we perform the…

Engineering

Electrical Engineering

Question 1: Why did we perform the no-load operation experiment for the asynchronous motor?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 15RQ

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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

Question 1: Why did we perform the no-load operation experiment for the asynchronous motor? Question 2:Why is the value of Cos phi small at no-load? Question 3: Find the cupper (Pcu), iron (Pfe) and frictional (Pfri) losses at no-load operation. What happens to cupper loss? Explain. Question 4:ls the calculated value of the Cos phi same with the measured value of Cos phi? Explain the reason if not. Question 5:Are the starting currents different for Y and A connections? Explain. Question 6:State your final observations about the experiment.

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