Anglicky v odborn ch p edm tech support of teaching technical subjects in english
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Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Physics Topic : Alternator Prepared by: RNDr. Ondřej Jeřábek. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

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Anglicky v odborn ch p edm tech support of teaching technical subjects in english

Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“

Tutorial: Physics

Topic: Alternator

Prepared by: RNDr. Ondřej Jeřábek

Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.


Alternator

Alternator


Alternator1

Alternator

General information:

  • Alternator is rotary electric machine

  • Changes rotary energy ( kinetics energy ) or mechanical energy to electric energy

  • Output capacity is led to electrical system


Alternator function

Alternatorfunction

  • Alternator works on electrical induction principle

  • Voltage is induced in conductor, if conductor and magnetic field move to each other

  • Extent of induced voltage depends on magnetic field rate and conductor movement speed ( engine revolutions )


Construction

Construction

  • Alternators are synchronous machines

  • According to their rotor’s type they further divide to:

  • With plain rotor- turbo-alternators – driving machine is mostly steam turbine (in steam power plant) speed turns 3000 min-1, as network freqeuency 50 Hz

  • Low-acting alternators are driven by low-acting machine (mostly by water turbine). Speed turn is whole number ratio of 3000 min-1, as network frequency 50 Hz

  • It makes mechanically connected set with driving machine. Driving machine and alternator are on the same shaft.


Alternator advantages

Alternatoradvantages

  • Alternator with rectifier is designed so that accumulator is charged when combustion engine runs idle

  • It is important advantage for city traffic

  • Accumulator durability charged by alternator with rectifier is longer than accumulator durability charged by dynamo

  • Alternator is excited directly of accumulator immediately after ignition start


Alternator function1

Alternatorfunction

  • Alternators produce electricity in the same way as direct-current generators

  • Rotating magnet rotates – rotor inside stationary fit windings on iron cores - stator

  • Electrical current is produced by rotor movement caused by mechanic energy

  • There are mostly sets of stator windings in stator that are moved round slight amount of 180°

  • Rotor magnetic field can be caused by induction or permanent magnet


Alternator usage in cars

Alternatorusage in cars

  • Car alternator has the same construction as industrial alternators

  • Car alternator produces 3- phase

  • electrical current

  • Alternating current must be rectified before entry to car network

  • Diodes are used to rectifying of alternating current

  • Diodes are fixed to diode bridge

  • To limitation of voltage values , alternator output direct current is controlled by Zener diode

  • Alternator advantage comparing with dynamo is mainly its low weight


Activity i

Activity I

  • Find out alternator on the Internet:

  • Alternator´s rotor and stator

  • Find out on the Internet alternator wiring diagram wired to electrical circuit


Activity ii

Activity II

  • Describe main alternator components that you found out on the Internet

  • Describe and explain alternator wiring to electrical circuit


Literature

Literature

  • JAN, Zdeněk; ŽDÁNSKÝ, Bronislav ; ČUPERA, Jiří . Automobily 1. Brno : Avid, 2004. 211 s.

  • JAN, Zdeněk; ŽDÁNSKÝ, Bronislav ; ČUPERA, Jiří . Automobily 2. Brno : Avid, 2004. 120 s.

  • JAN, Zdeněk; ŽDÁNSKÝ, Bronislav ; ČUPERA, Jiří . Automobily 3. Brno : Avid, 2004. 220 s.

  • JAN, Zdeněk; ŽDÁNSKÝ, Bronislav ; ČUPERA, Jiří . Automobily 4. Brno : Avid, 2004. 350 s.

    Translation:

  • www.seznam.cz

  • www.slovnik.cz

  • JANATA, Petr. Handy slovník technický anglicko-český a česko-anglický. Plzeň: Nakladatelství Fraus, 2000. ISBN 80-7238-075-3

  • Lingea LEXIKON 5, Technický slovník anglicko-český a česko-anglický. 2010.


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