Re: using a motor as a generator

Im not worried about efficiency for power in vs power out its more for
dealing with heat, same thing but what i meant was would the alternator
run cooler than your "average" permanent magnet generator. I didnt
realize that treadmill motors were dc what voltage, i might pick some
up just to play with. A problem though is this thing is supposed to be
towed behind a bicycle so i think that might be too heavy. if its in
the 10-15 pound range and not too big it might be perfect. Ive been
looking around surplus places and my main problem is there are no specs
sometimes they just show a picture and say "12vdc motor 3000 rpm 1.4
amps" should say "good luck" right after it too. I wasnt really
worried about burning up the engine, I was saying that i dont think the
540 mabuchi motors would make a good generator because of heat
handling, mine has .2 ohms of armature resistance so at 25 amps im
looking at 125 watts of heat. I cant imagine a small motor like that
dissipating this kind of heat. I plan on having the unit controlled
with a pic microcontroller, with temperature sensors amperage shunt
voltmeters etc , basically going as far as the resources in the pic
will let me with 33 i/o lines and 8 k program i should be able to get
good control. Anybody know of proven pmdc motors that take about 30-40
amps continuous ( that dont cost a million dollars nor weigh a million
pounds). continuous power ratings also seem really really hard to come
by for the average non industrial motor. I know it seems like im
being difficult here but i cant find a good motor, i could just use the
small car alternator but maybe there is a good motor out there that i
dont know about.

.

Relevant Pages

  • Re: How to determine BTU output of an electric pump
    ... At 1 hp for 1 hour, the BTU equivalent is ... At 230 V, 7.5 A, power is 1.725 kW. ... Is this a heat loss figure? ... WAG would be that motor on this rig runs ~ 85% efficient under load. ...
    (sci.electronics.design)
  • Re: Horse power of motor
    ... A motor that draws 1.7 amps at 115V is pulling about 200 watts of electrical ... That electrical power is going partly into ... mechanical work at the shaft, and partly into heat in the windings. ...
    (rec.crafts.metalworking)
  • Re: Future of the Class 59
    ... air movement across the wire removes the waste heat. ... This is what happens in a traction motor; ... can't just close the power controller and open it again straight away. ... The wheels on this bogie are therefore capable of transmitting ...
    (uk.railway)
  • Re: DC Motor Control - Heat Issue
    ... > The motor driver that the motor company sells and recommends runs at ... > Assuming this formula to be true for the amount of power lost in the ... > windings (generating heat), it can be seen that there are two ways to ... and I just can't imagine how adding inductance ...
    (sci.electronics.design)
  • Re: using a motor as a generator
    ... dealing with heat, same thing but what i meant was would the alternator ... run cooler than your "average" permanent magnet generator. ... sometimes they just show a picture and say "12vdc motor 3000 rpm 1.4 ...
    (sci.electronics.basics)