Vital Questions About Alternator And Motor

Discussion in 'General Electronics Chat' started by henry newton, May 5, 2008.

  1. henry newton

    Thread Starter Member

    May 5, 2008
    I must say here that i am not an expert in this area (Electric
    generator or Alternator and Electric Motor) but judging by what is
    happening in recent years in-terms of the continious rise in oil price
    which has reached a record high recently and more importantly the
    undenialable,bleak and apocalyptic picture of the earth as a result of
    global warming i am beginning to find it interesting or should i say
    out of necessiting to take an adventure into this area hoping to
    contribute my part to solving this problems.But before i kick start my
    adventure just like anybody who would embark on one,i need a survival
    kit.That is where you guys, anybody that has some knowledge in this
    domain comes in.I hope it is worth it.
    Well i have some vital and basic questions about an Electric generator
    or an Alternator as well as Electric motor:

    1.Is it possible to get a decent or reasonable result in terms of
    terminal voltage,current or power at the output of an Alternator that
    uses Permanent magnet as the rotor instead of electromagnent especialy
    now that there are more powerful permanent magnet available.

    2.What are the advantages and disadvantages of using permanent magnet,
    electromagnent as the rotor of an Alternator.

    3.What are the factors that determine the terminal voltage,current or
    power output of an Alternator.

    4.Can Aluminium laminated core be used in the rotor of an Alternator an
    Motor instead of soft iron core that seem to be predorminantly used.If
    Yes why isn't Aluminium used. Personaly i think aluminium is lighter
    thus if used could mean lighter rotors and conscequently faster spinnig
    rotors.this is just what i think but i still want some other technical
    reasons from you guys.

    5.What are the advantages and disadvantages of using more poles(i.e any
    thing greater than two poles) for the rotor of an Alternator in terms
    of the terminal voltage,current or power output of an Alternator

    6.What are the advantages and disadvantages of using more poles (i.e
    any thing greater than two poles) for the rotor of an Electric Motor.

    7.If the output Frequency of an Alternator is specified by the
    manufactural as 50Hz, and for some reason drop to say 30Hz which is way
    to low for an electric home appliance the Alternator is supposed to
    power.Is it possible to use some kind of electronic circuit at the
    terminal to fix this probblem by way of increasing the frequency back
    to 50Hz. In other words this special frequency step-up electronic
    device is placed between the Alternator and the electric home appliance
    from which it gets it's power and in the right frequency. does the speed of rotation of the rotor of an Alternator affects
    the terminal voltage,current or power of an Alternator.

    Thank you guys in advance.

    ooch! i forgot, i am Henry bye the way. is my email address
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    1. Yes

    4. Aluminum is not magnetic and would therefore be a bad choice.

    7. Sorry, no such animal. The universe just doesn't work that way.

    For the other numbers, I suggest borrowing a good library book, as those answers are fairly lengthy.
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    Many of your questions can be answered by reading some basic electrical information. Here is a link to the Wikipedia article on power generation -

    The article and the references should answer most of your questions.