• What is the theory behind the speed control through the variation of the field resistance? • Discuss the schematic diagram for the field resistance speed control • Discuss the load characteristics (speed- armature current) of this control

• What is the theory behind the speed control through the variation of the field resistance? • Discuss the schematic diagram for the field resistance speed control • Discuss the load characteristics (speed- armature current) of this control

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 4RQ

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Concept explainers

Maximum power transfer theorem

A resistive load will consume maximum power from a network when the load resistance is equal to the resistance of the network as viewed from the open-circuit terminals, with all energy sources removed leaving only the internal resistances. Physicist Moritz von Jacobi introduced the maximum power transfer theorem in 1940. Therefore, this theorem is also known as Jacobi's law.

Question

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Field Resistance Speed Control of DC motors
What is the theory behind the speed control
through the variation of the field resistance?
Discuss the schematic diagram for the field
resistance speed control
· Discuss the load characteristics (speed-
armature current) of this control

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