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Electric motors newbie questions

Discussion in 'Electronic Basics' started by Scale, Jun 21, 2007.

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  1. Scale

    Scale Guest

    Hello, I'm a newbie and I'd like to learn a little about electric

    I've had a run-through of electric motors and I understand the basics
    (how they work, that they are an inductive load, etc), but I've got a
    few questions:

    1. Is there an easy equation or way to find the torque that the the
    motor will give out for a given load and voltage/current etc?

    2. What information is understood from a motor constant and how is
    this found for an arbitrary motor (say, one that I've aquired and wish
    to understand but have no spec sheet for)

    3. What is a blocked rotor test (besides some sort of test that is
    done while blocking the rotor.. I.e. what is measured?) and what is
    understood from this?

    Maybe I'm just not looking in the right places, but I can't seem to
    find any plain English information on this.
    If someone could even point me to a good website or something I'd be
    extremely thankful.


  2. BobG

    BobG Guest

    I assume you are interested in dc motors with brushes? And permanent
    magnets or wound field? Or brushless? Or ac? Are you interested in
    design rules of thumb... how to pick the right speed/torque/power for
    a certain application? I guess we all assume the basics.... watts is
    volts x amps and power is torque x speed. More volts -> more amps.
    More amps-> more torque.
  3. Guest

    UR intrested in DC well the moter principle is deprnds on

    T=rXp (torque=rdies x power)
    Same principle applicable here The total ac mesured in P=IxV
    so in moter the magnatic brush produce required power as above
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