small ac generator

Discussion in 'General Electronics Chat' started by Zara Engineer, Aug 7, 2015.

  1. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hello guys,

    I want to buy for my project a small ac generator to have a 12VAC to 18VAC per example and power of 10 W

    where can I buy this tiny generator .

    I tried to make a BLDC motor as a generator by using an ac drill but the result is 3 VAC on 25 rps I think .

    so please has anyone an idea about small generator or alternator ?

    thank you in advance

    Zara
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    How about using an oscillator and audio amp to generate the AC power?
     
  3. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    hello,

    No Cruts, my project is to produce voltage from external generator
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    What will drive this generator?
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,500
    2,365
    Is 1ph or 3 ph required?
    Any particular Hz?
    You require a P.M. BLDC motor, an AC drill usually has a universal motor and will not generate, at least to any usefull degree.
    A stepper motor can also be used to gen AC.
    Max.
     
  6. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hello,

    The generator is used for supplying an electronic board so it's going to a rectifier after generation .

    It's not important to be 3 phase or 1 phase , but the one phase is better for me.

    and about the stepper motor can do the job more than the BLDC I've used .


    thank you very much
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,500
    2,365
    Why not use a DC P.M. brushed motor to begin with if you do not require the AC?
    Max.
     
  8. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hello ,

    I read about the old dc generator in the car , and it's replaced by a dynamo or alternator to reduce the size and the effiency without the commutator existed in the DC motor.
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,500
    2,365
    If you only want 10watts the size difference is going to be minimal.
    One of the reasons for the alternator over DC is also sufficient output down to very low rpm, the automobile application rpm control is not constant.
    Max.
     
  10. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hello,

    Mmm ok I want to see this choice , I hope this help , but can you give some sites to buy this generator ?

    thank you
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,500
    2,365
    You just need to seek out a 1amp 12vdc DC motor.
    The DC output is dependant on rpm so 12v will be at the rated rpm of the motor.
    If you want a lower rpm source then opt for a suitable higher voltage motor that you can run at a lower rpm.
    Max.
     
  12. Nykolas

    Member

    Aug 27, 2013
    87
    31
    How about one of these generators driven by a bicycle tire for the lights? E
     
  13. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hello Max,

    Thank you very much for your fast reply.

    Nykolas , yes it's right but it has a low power output , and it's big compared with DC motor.
     
  14. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hello everyone,

    I found an 3 phase ac dynamo 10W.
    And I want to do some simulations , to do that I should find the Kt constant and Kv , is it true , is the ac synchronous motor like the bldc motor calculation the constants ?

    If it's, what's the method to find this constants ??


    thank you
     
  15. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,500
    2,365
    More info on the alternator is needed.
    Max.
     
  16. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
  17. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,500
    2,365
    It does not appear to show spec's? Dynamo usually refers to a DC type generator, if AC it is alternator, but they use both terms so it is a little misleading?
    Max.
     
  18. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    hello Max

    Ok I said about the alternator

    so?

    thank you
     
Loading...