Question 11 Assume that the motor is reconnected separately excited, as shown in Figure Q11. It has a fixed field voltage VF of 240 V and an armature voltage Va that can be varied from 120 to 240 V. IF RA IL 0.40 2 Radj VE = 240 V Rf = 100 N EA V = 120 to 240 V Lf Figure Q11 a) What is the no-load speed of this separately excited motor when Radj = 175 Q and 1) VA = 120 V, 2) VA = 180 V, 3) VA = 240 V b) What is the maximum no-load speed attainable by varying both VA and Radj? c) What is the minimum no-load speed attainable by varying both VA and Radj?

Question 11 Assume that the motor is reconnected separately excited, as shown in Figure Q11. It has a fixed field voltage VF of 240 V and an armature voltage Va that can be varied from 120 to 240 V. IF RA IL 0.40 2 Radj VE = 240 V Rf = 100 N EA V = 120 to 240 V Lf Figure Q11 a) What is the no-load speed of this separately excited motor when Radj = 175 Q and 1) VA = 120 V, 2) VA = 180 V, 3) VA = 240 V b) What is the maximum no-load speed attainable by varying both VA and Radj? c) What is the minimum no-load speed attainable by varying both VA and Radj?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

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