12 volt motor help, please!!!
12 volt motor help, please!!!
(OP)
Ok I am new here, but I have come to the experts to find the answers I need. I am planning on using a 1.2 hp geared 12 volt elec motor. It turns at 40 rpm and has 836 in.-lbs of torque. which is roughly 70 ft-lbs of torque. it uses 33amps.(not sure about if this is under a load or if it even matters)
I am using the motor as a drive motor witch will use belts and idler pulleys. there will be almost 200 feet of flat belt being used. the belt will be made of an elastic urethane, having a cross sectional measurement of 1/16" thick x 1/2" tall.
so here is my question, will the motor be big enough to do what i am wanting? Will it be ok to use continuously(24-48hrs)? And how fast will it draw down a 12 volt battery.
any help would be greatly appreciated. below is a link to the type of motor that i am possibly think about using.
I am using the motor as a drive motor witch will use belts and idler pulleys. there will be almost 200 feet of flat belt being used. the belt will be made of an elastic urethane, having a cross sectional measurement of 1/16" thick x 1/2" tall.
so here is my question, will the motor be big enough to do what i am wanting? Will it be ok to use continuously(24-48hrs)? And how fast will it draw down a 12 volt battery.
any help would be greatly appreciated. below is a link to the type of motor that i am possibly think about using.





RE: 12 volt motor help, please!!!
Mike Halloran
Pembroke Pines, FL, USA
RE: 12 volt motor help, please!!!
RE: 12 volt motor help, please!!!
Mike Halloran
Pembroke Pines, FL, USA
RE: 12 volt motor help, please!!!
So, if you tell us what load the belt carries, the inclination, length of belt (you say 200 ft, does that mean a 100 ft conveyor?) and the linear speed of the belt, we (or you) can calculate the work and from there, we (or you) can decide if the motor is OK for this job.
Anyhow, with full load amperage 33 A, you will run a standard 12 V lead battery down in a couple of hours.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: 12 volt motor help, please!!!
RE: 12 volt motor help, please!!!
That motor appears to be a worm drive, which provides high output torque at slow speed, but be aware that these may or may not backdrive [cause/allow the motor to spin if a load is left on the output shaft].
Again, a clue what your end function is would help. Speeds involved, loads, torque actually required.
RE: 12 volt motor help, please!!!
so as far as the inclination, there should be none because it will be on a horizontal plane.
length of belt would be 200 linear feet (idealy, could be shorter if needed to be)
and linear speed would be however fast a duck can swim i guess. not sure about the speed but i would guess at maybe 60 feet per second would be a good starting point.
the 33 A answer is good. i figured at least 4 -6 hours hopefully. i just wanted to make sure it wouldnt draw it down in less than an hour of run time.
RE: 12 volt motor help, please!!!
RE: 12 volt motor help, please!!!
Mike Halloran
Pembroke Pines, FL, USA
RE: 12 volt motor help, please!!!
I am a structural - so not really well versed in this area - but if you are pulling 33 amps - check the amp rating of your battery and subtract about 20% and you might be close.
RE: 12 volt motor help, please!!!
RE: 12 volt motor help, please!!!
Also bring a stopwatch and time yourself as you trudge thru the water over a measured distance, like 20ft. Be accurate. Be up to speed when you enter the timing zone.
Those two numbers will give you exactly the torque and motor speed you will be needing. You should not be guessing these fundamental values of your system.
Once you have those numbers everything else will fall out for you. Motor size, gear ratio, motor type, current draw, battery size, solar panel size, safety items, wire size, switch ratings, etc etc.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 12 volt motor help, please!!!
this will sure beat just guessing at a motor and not getting the right one.
and thanks for the info on the battery Amps/hour too.
RE: 12 volt motor help, please!!!
To be a little more accurate in my description, the scale gives you the force. Torque is the twist a motor needs to supply, times the radius of the drive pulley that will be converting the motor's torque into that linear force.
So: The scale reading times pulley radius = motor's torque requirement.
Of course you need all the units to be correct and you need to multiply the experimentally measured result by a reasonable fudge factor to make sure it still works in an old or poorly installed situation.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 12 volt motor help, please!!!
Are you going to be driving the motor or shooting the shotgun?
rmw
RE: 12 volt motor help, please!!!
Bill
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"Why not the best?"
Jimmy Carter