Can a 24V motor generate more than 24V?

Discussion in 'General Electronics Chat' started by cikon, Mar 26, 2014.

  1. cikon

    Thread Starter New Member

    Nov 4, 2013
    2
    0
    I am doing a project that use a BLDC motor as a generator. The generated voltage can go more than 24V right? Because it depends on the speed.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    I Dunno abt BLDC but BDC ones can.
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,571
    2,382
    Yes. 3phase generator.
    Same as an automotive alternator, except auto version has DC fed field instead of PM.
    Max.
     
  4. cikon

    Thread Starter New Member

    Nov 4, 2013
    2
    0
    yeah. But can the motor withstand that ? I mean their winding and stuff.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,571
    2,382
    The winding insulation is not that tightly spec'd for a particular voltage.
    And they are on the stator, so centrifugal forces are not an issue.
    max.
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,156
    3,063
    The manufacturer had to choose the nominal voltage for the specification. I'm not sure exactly how they do that, but it would be at some specified current load. The rotational speed - rpm - required to hit that power output has to fall within the mechanical specifications. At some point, I think higher rpm no longer gives as much power as it should, due to inductance.

    Running at higher voltage but lower load shouldn't be a problem as long as you're not over rpm or overload.
     
  7. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,046
    1,679
    Typically most things like that still have to pass a HiPot test which can be anywhere from 500 to around 2500 volts from windings to case so over voltage working as a generators is not an issue.

    Odds are the rotor would fly apart well before the output got anywhere close to the 500 volt bottom end rating.

    As long as you are not exceeding the designed and rated current for extended periods of time you can pretty mush spin a motor up as a generator until it flies apart.
     
Loading...