# 3000Chapter15 - Chapter 15 DC Machines 1 Objectives State...

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1 Chapter 15 DC Machines

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2 Objectives State Faraday’s Law and Lenz’s Law Calculate the voltage generated by passing a wire through a magnetic field. Sketch a simple generator and describe how it operates. Describe a commutator and brush assembly and state how it works.
3 Objectives Find the force produced on a current-carrying wire in a magnetic field. State the differences between a shunt and compound dc generator and describe the performance characteristics of each. Sketch a simple dc motor and describe how it operates. State the differences among a shunt, series, and compound dc motor, and describe the performance characteristics and application examples of each.

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4 15-1 Introduction
5 15-2 Magnetic Induction and the DC Generator Faraday’s Law e = N dΦ / dt e = the induced voltage in volts (V) N = the number of series-connected turns of wire in turns (t) dΦ/dt = rate of change in flux in Webers/second (Wb/ s) e = B L v B = the flux density in teslas (T) L = the length of the conductor that is in the magnetic field in meters (m) v = the relative velocity between the wire and the flux, in meters/second (m/s)

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6 Magnetic induction in a wire moving in a field.
7 Right-hand rule for magnetic induction.

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8 Wire loop rotating in a magnetic field.
9 AC generator with slip rings and brushes.

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10 DC generator with commutator and brushes.
11 DC generator output waveform.

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12 DC generator with field control.
13 DC generator four-pole field.

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14 DC generator rotor with two coils.
15 Coil and output waveforms for a two- winding rotor.

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16 Rotor with several rotor coils and commutator segments.
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## This note was uploaded on 08/15/2010 for the course COMPUTER E 3000 taught by Professor Muhamadirfan during the Spring '10 term at Sir Syed University of Engineering &Technology.

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3000Chapter15 - Chapter 15 DC Machines 1 Objectives State...

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