A separately-excited DC motor has lap-wound armature with 100 slots and 2 turns per coil. It is rotating at 120 rpm and flux per pole is 0.1wb. Armature resistance is 12 and armature loss is 10W. Determine: (i) (ii) Source voltage Starting armature current

A separately-excited DC motor has lap-wound armature with 100 slots and 2 turns per coil. It is rotating at 120 rpm and flux per pole is 0.1wb. Armature resistance is 12 and armature loss is 10W. Determine: (i) (ii) Source voltage Starting armature current

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

Types of Thyristors

With four layers of alternating P- and N- materials, a thyristor is a solid-state semiconductor device. It acts as a type of bi-stable switch and it conducts when the gate receives a current trigger and continues to conduct until the voltage is reverse biased across the device or by some means until the voltage is removed. The silicon-controlled rectifier is considered synonymous with thyristors by some sources. Thyristors are defined as more complex by other sources as it contains at least four-layer of alternating N-type and P-type substrate. They find large applications in the control of electrical power supplies, electric motor speed control, and ranging of light dimmers because thyristors can control large amounts of power supplies and voltage with a small device. The circuit symbol of the thyristor is given below.

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Draw the circuit please.

A separately-excited DC motor has lap-wound armature with 100 slots and 2 turns per coil. It
is rotating at 120 rpm and flux per pole is 0.1wb. Armature resistance is 12 and armature loss
is 10W. Determine:
(i)
(ii)
Source voltage
Starting armature current

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