logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Does an alternator need excitation to start charging and how is it done?

JanuszJ26 76408 11
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #1 3216565
    JanuszJ26
    Level 14  
    Posts: 136
    Help: 3
    Rate: 34
    Hello
    does the alternator need to be aroused, and if so, how to do it??? thanks
  • ADVERTISEMENT
  • Helpful post
    #2 3216614
    Aleksander_01
    Level 43  
    Posts: 12633
    Help: 1151
    Rate: 3355
    Hello.
    Sure you must.
    A voltage is applied to the rotor winding, the flowing current creates a magnetic field, the magnetic field "crosses" the stator winding, a current is induced in the stator windings.
    This current is rectified in a six-diode bridge.
    Regards
  • ADVERTISEMENT
  • #3 3216911
    goldwinger
    VIP Meritorious for electroda.pl  
    Posts: 6900
    Help: 531
    Rate: 2093
    unless we have a self-excited alternator, which is so rare that I have never seen one live
  • ADVERTISEMENT
  • #4 3216949
    Fazi500
    Level 12  
    Posts: 56
    Help: 3
    Rate: 10
    There is a bulb in the excitation circuit of the alternator - the one that signals the lack of charging, its burnout can lead to a situation where the alternator will not excite.
  • #5 3218764
    piotrpak
    Level 13  
    Posts: 111
    Help: 2
    Rate: 37
    how to wake up apply voltage to the excitation. The regulator is responsible for the excitation.
  • ADVERTISEMENT
  • #6 3218821
    asterix17td
    Level 17  
    Posts: 163
    Help: 17
    Rate: 18
    Hello
    this bulb is probably a joke
    She is just a loading indicator. The alternator rotor is not powered by it.
  • #7 3218875
    Los_sandalos
    Level 27  
    Posts: 1200
    Help: 90
    Rate: 197
    This bulb is exactly the same. From the battery we give + to the light bulb and then we go to the alternator connector. This connector seems to be the output of the auxiliary rectifier of the alternator, rectifying the current for the excitation system. The current that the bulb passes through is enough to energize the alternator.

    And by the way, I've been thinking recently about the possibility of pasting a very small magnet in the armature so that the alternator can excite itself. I think it's possible.
  • #8 3218904
    goldwinger
    VIP Meritorious for electroda.pl  
    Posts: 6900
    Help: 531
    Rate: 2093
    asterix17td wrote:
    Hello
    this bulb is probably a joke
    She is just a loading indicator. The alternator rotor is not powered by it.

    well, look, and sometimes it goes off and doesn't load, it's just a mystery
  • #9 3218969
    DJ.Wielebny
    Level 16  
    Posts: 111
    Help: 11
    Rate: 21
    Hello, regarding the alternator, it is so that if it has a 6-diode rectifier, it is separately excited, and if the alternator has an auxiliary rectifier, it is a self-excited alternator (the simplest example is an altek from Polonaise) and if such an alternator is properly connected to the voltage regulator and the rotor it will rotate at least with the minimum revolutions needed to generate the nominal voltage (usually 400-500 rpm) such an alternator will generate voltage at the output terminal without connecting the battery, and the charging indicator works (lights) on the basis of the voltage difference between the rectifier output auxiliary and the voltage of the battery. :D
  • #10 3219298
    asterix17td
    Level 17  
    Posts: 163
    Help: 17
    Rate: 18
    ".... well, look and sometimes it goes off and does not load, it's a mystery..."
    I would rather write it like this:
    first the alternator stops charging, then the bulb goes out and there is no riddle anymore.
    You do not believe? remove the bulb and see if the battery will charge.
    Regards
  • #11 3219424
    goldwinger
    VIP Meritorious for electroda.pl  
    Posts: 6900
    Help: 531
    Rate: 2093
    if we take it out with the engine running (i.e. it is charging), then yes, because it is already excited, but if the bulb is not there before starting, the excitation current will not flow. But it is not always the case that without a light bulb it will also work
    Regards
  • #12 3220175
    ryszardon
    Level 21  
    Posts: 469
    Help: 34
    Rate: 95
    Hello. Here is the solution to the riddle of why the light bulb goes off and on.

    Z-ignition off
    R-voltage control
    Attachments:
    • Does an alternator need excitation to start charging and how is it done? alternator.JPG (31.19 KB) You must be logged in to download this attachment.
Reply | New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around the need to "wake up" an alternator, which typically requires applying voltage to the rotor winding to create a magnetic field that induces current in the stator windings. Most alternators are not self-excited, and a common issue arises when the excitation circuit's bulb burns out, preventing the alternator from functioning. To energize the alternator, voltage must be applied to the excitation circuit, often facilitated by a light bulb that indicates charging status. If the bulb is absent, the excitation current may not flow, leading to charging failures. The conversation also touches on the possibility of using a small magnet in the armature to enable self-excitation. The alternator's operation is further clarified by discussing the role of the rectifier and the voltage regulator.
Generated by the language model.
ADVERTISEMENT