12v 90 Amps Car Alternator to Self Excited Generator using DIODE

hi guys this what you see is a car alternator  value from an ascent car now the rating of this   alternator is 13 point 5 volts 90 amperes value  now guys the alternators are usually high rpm   ranging from two thousand to five thousand rpms  so in this video what I'm going to do is perform   a small trick with which the RPM will reduce  considerably I personally call that technique   manual Fu's voltage injection step 1 removing the  back cover yeah back cover removed what I'm going   to tell you guys is very important before we  proceed to the next part so this part what you   see is obviously for the brush so there are two  brushes feeding electricity to the slip rings of   the rotor that is obvious part okay you see this  green wire I attached it manually to modify it in   one of my previous videos link 4 which will also  be provided in the description now you see that   there are two brushes and I have connected via  to only the lower case brush and not the upper   case that is because internally the upper case  brush is directly connected to the body of the   alternator as negative we know that the body is  negative and the longest terminal called the B is   the main output positive so this long terminal  B is positive body is negative and the upper   brush is also negative so internally somehow  this upper brushes in short circuit with the   body of the alternator so with that being clear  let's proceed to the next part now guys the next   part is that because the upper brush is connected  to the body of the alternator all I have to do is   connect positive terminal to this part and use a  3.7 volts battery and can the negative terminal   to the body of the alternator and this is going  to excite the rotor winding of the alternator   which means the electromagnetic rotor inside is  going to get excited if I connect the positive   terminal yeah this one is positive during the  positive terminal like this and negative to   this one but this is connected to the body  of the alternator so this is also negative   and there is a little spark that I can see  but you cannot so this is how the rotor will   get excited okay now guys this what you see is  a very old antique fan speed regulator you see   so the reason I am showing you this is because  of its filament now guys you see this filament   it is very useful so let's cut it off now guys  this hold reader that you see is a self excited   type which means that the rotor automatically  gets excited without any external input from the   battery okay so I am going to achieve that state  with the help of this resistor okay you see this   positive wire that I'm manually connected to the  lower brush so what I will do is found this on   the positive wire and connect its other end to  the positive long be terminal so let's do that so the positive main terminal output terminal of  the alternator has been electrically connected to   the lower brush terminal feeding the rotor  okay now this alternator is in automatic   self-excitation mode let me show you this first  and now all I have to do is run this and it is   going to get automatically self excited but to  show you that I'll have to connect a multimeter   so let's do that also taking the traditional  old multimeter and pointing it towards twenty   volts DC mode okay these are the two terminals  let's connect it to the alternator now guys   the multimeter will be connected to the main  output terminals of the alternator and which   are the main output terminals body being  done negatives and long terminal being the   positive positive means red connected to the  red terminal done negative means black will be   connected to this terminal or any other part  I will connect it to this although it is not   clearly visible let's connect it to this now  the ordering e2 has been electrically connected   to the multimeter okay so guys now comes the  Rope rotation test and this is the rope roll let's round the thread on the pulley of the  alternator now guys the thing with this alternator   is that it is not going to generate anything as  long as the RPM is slow so let's do that first   guys keep watching the multimeter screen go  it is still slow now let's give it another try once more guys so guys what we can learn from this is that it  is not possible to attain self-excitation by   human hand rotation although I did achieve this  self excitation in one of my previous project so guys that was the first method of achieving  self-excitation which was not possible to achieve   with human hands so let's get to the second method  so in this let's remove this resistive wire not   needed anymore and for this step I'm going to need  some jumper cables okay available on Bangor's link   is in the description 1 3.7 volts lithium-ion  battery and two neodymium magnets very strong   although if you don't have these strong ones  you can also use a little weaker once they are   also going to work - so guys here I'm going to  use the black and red cables from all of these   ok this one is black yeah black is out and red  which is out also and I've to remove all these   after which I have to take the battery and place  one magnet neodymium magnet on the positive side   which is this one okay the positive that being  done let's proceed to the negative other magnet   on the negative now this is also done ok measure  the battery voltage pointing towards 20 volts   DC mode to make sure that it is charged plus  and minus and you can see that it has charged   showing three point eight six volts DC really good  charged in fact now take the jumper cables both   red and black remove the first ones insulation  cover okay as well as the second one only on one   side and then stick it black to negative add red  to positive okay this side is negative black is   negative so yeah connected and here this positive  connected now there should be voltage on these two   terminals and yes it is okay yeah a negative has  also been connected now the multimeter is only   going to measure the output of the alternator so  now comes the part of connecting the battery to   the alternator electrically so black you already  know is the negative which will be connected to   the body of the alternator okay black has been  connected negative negative and positive will be   connected to this green terminal but before  I connected I must tell you that this is an   uncontrolled forced voltage injection method  uncontrolled which is very important so let's   connect that there will be a little spark I guess  and I'm not able to see it here because it has   very bright now let's round the thread on the  shaft of this alternator and see some voltage   reflected give it a turn yeah you see the voltage  is being generated pretty good two volts three   volts and all let's run it with a rope rotation  test keep watching the screen guys go somewhere   around eight volts now the disadvantage is  that when the alternator starts generating   electricity it will feed 12 volts to this 3.7  volts battery pack which is not needed at all   the battery will get damaged and it will charge  to unwanted values so to tackle that situation   I have found a solution diode okay six amperes  diode is what I am going to use to change this   into an auto disconnect excitation so at the  start the battery is going to feed the rotor   winding of this alternator some voltage but  as soon as this alternator gains voltage the   generated voltage more than the voltage of the  battery itself the diode will act as an open   switch with no current flowing to the battery  and all of it flowing to the rotor itself okay   so for that I will have to make two changes so  the first is placing the diode the black portion   not the silver one is positive for the diode so  positive from the battery will be connected to   the positive of the diode and negative will be  connected to the green terminal okay connected   okay now comes the self-excitation part in which  I'm going to use this resistance wire again have to feed the rotor winding  after all okay so let's do that also you can see some voltage on the multimeter screen  that's the voltage being fed to the rotor winding   and decreasing because the battery is getting  discharged okay keep watching the display   string guys once again now guys for final testing  this third method let's connect some load to it so guys here I'm going to use this 12 volts 60   watts bulb which means it's  going to consume 5 amperes to separate the terminals from touching each  other battery connection negative to negative   done positive to diode positive done I have to  remove this first I haven't connected multimeter   so yeah let's check it without the multimeter too  many connections now rope winding keep watching   the bulb it is not going to glow very bright  first of all because it's going to be hand   rotation and second I am outside in the lawn so  it is very bright over here now guys achieving   the self-excitation mode is much more easier now  guys although this is the final method I still   have not created the flow of electricity from the  alternator to the battery or charging it at the   same time when the alternator is running so I have  to charge the battery also which is a little bit   electronic circuitry type I will have to make  our feedback circuit with a step-down voltage   conversion that is required to charge a 3.7 volts  battery so that will see in one of my upcoming   videos now guys I also have to measure the amps  that this alternator is generating pointing the   meter towards 10 amperes mood although the  alternator is 90 amps but still I'm going to   do that terminals have been connected now  remember guys this multimeter can measure   current only up to 10 amps after which although  it might show measurement but the fuse might just   open because of reaching the maximum limits so  let's try the current measurement anyways all keep watching the display screen guys now let's go a little hard on it nine  point five amperes let's disconnect it   so that was the current measurement for the  alternator although it is ninety amperes but   it is not possibility to produce high amps  with hand cranking okay so guys that was   all about today's video I hope you enjoyed  it now the next part will be coming soon   related to the self excitation and automatic  battery charging along with the running of   alternator so stay connected subscribe and  hit that Bell icon and I'll see you soon

Channel: Mr Electron

Views: 1,327,465

Rating: 4.4243069 out of 5

Keywords: mr electron, mr.electron, 90 Amps, alternator by mr electron, Generator using DIODE, alternator 12v, alternator amps, car alternator, 12v alternator, self excited, 12v car alternator, alternator, self excite, amps, alternator to generator, generator, 12v, 12v generator, Self Excited Generator, self excitation, using diode, diode, 14.4v, 13.6v, volts, alternator generator, valeo alternator, कार अल्टरनेटर, how to self excite an alternator, self excited alternator

Id: dlvGYFB6AqM

Length: 15min 30sec (930 seconds)

Published: Sat Jan 11 2020