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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.

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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