Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Understanding Magnetism in a Syncronous Motor

  1. Oct 28, 2011 #1
    Would there be any difference of resistive magnetism created in a Syncronous Motor used for a generator as opposed to other types of motors?

    Reason being is that I'm doing some research on generators for my own personal advancement and was wondering if there was a way and proceeding producing the benefit, to reversing the pole created, for a appropriate amount of Miliseconds, on a coil that has a load of current on it in a generator, decreasing the amount of Electromagnetic resistence that a nromal generator creates with a Load on it?

    Thoughts...? TIA
  2. jcsd
  3. Oct 28, 2011 #2
    You lost me at "proceeding producing..."
  4. Oct 28, 2011 #3
    Proceeding, producing a benefit"


    In other words, using a split second reversed pole (n or s?) to help cancel out or reduce the magnetic resistence that a normal Generator produces under load....

    Just curious what these guys are doing also...

  5. Oct 29, 2011 #4


    User Avatar
    Gold Member

    Hi Mastiffman,

    I understood what you said, I watched the three video's and think I understand everything they show in the setup of the system. It is pretty much in-line with what I have said in several post in the past.
    I found it difficult to understand the dialog while the noise of the system was in action and the walk-around was poor in quality, but it seems to me that there was no hoax of any kind.

    It looks like a (window motor ?) acting as a generator, my thought is, the Variac and capacitor bank are key parts that allow control of wattage in and out. The mass of energy storage due to flywheel affect of parts in rotation, is much greater than the input and withdrawal of power taking place in micro, or even nano seconds.

    I am curious as to why the sound was loud ? the running of my system even with compression of air seems a bit quieter.
    I won't be rushing to him with a hand full of cash, but will try to keep an eye on his progress should he post more information.

  6. Oct 29, 2011 #5
    Okay, thanks for the reposnse!

    I'm interested to know what your thoughts would be about a Stator on a Generator that has Spinning Coils on the outside instead of fixed coils... Would this be a way to cancel or reduce back EMF?

    Here is http://www.intalek.com/Papers/Handout3.pdf" [Broken]that is interesting...
    Last edited by a moderator: May 5, 2017
  7. Oct 30, 2011 #6


    User Avatar
    Gold Member

    Hi Mastiffman,
    I'll engage a little bit, but I respect my priviledge of membership too much to go very far in discussing such links as provided ( I do find them of some intrest ).
    My thoughts about back EMF being eliminated or reduced, is analogous to floating in a canoe and losing your paddle, or cutting off the flat blade portion.

    In regard to your question of Spinning Coils, my guess is the suggestion of motor housing and rotor, being free to rotate in opposite directions ? if that is what you have in mind...I have done that with a small PM motor and it works to some extent, but as speed increases, control of torque between the two becomes delicate to control.

    My best results was two motors powering one jackshaft, the control is having each armature connected to the other motors housing and all 4 parts are belted to the jackshaft. Voltage can be doubled from (my case) 120v to 240v rectified to DC, the armature speed is still at spec rating, but comutator/brush action is two fold and current is only limited by cooling abilities.

    In my mind, magnets and electric, are good for fast switching and control of power flow, but the only real gain of energy will come from air in the surroundings that carries some portion of the sun's heating.

    Right now I'm trying to learn how to make use of some Semikron SKKT 95/12E thyristors in a three phase rotatory converter design, the more I learn, the more I find that I need to know about other things.
    I love finding things like this link and comparing to what I have. (a 7 pound 12v 200amp alternator)


    Hope the link works.



    The link that has the specs
    Last edited by a moderator: May 5, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook