Added: 4 years ago
From: synthead
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  • loving the audio.

  • Great experiment. 5* !

    The coil on the motor was made from relatively thick wire, hence low resistance, likely a lot less than 0.5 ohms.

    At 12 volts that yields in 24 Amps.

    Those alligator leads are not rated for that type of current hence they become very hot.

    From my own experience I have found that they go up in smoke after a while at currents of around 5 to 10 Amps continuous.

  • @lexmoboy13 The rotor's commutator, located on the legs, bridges and breaks the power so it can emit a magnetic field at the right time to kick it into rotation. Without the commutator, it would simply sit, overheat, and kill the battery--it wouldn't have any timings set and would fail to operate like a motor. So this is important!

  • @hyunchoi98 Almost! If the power drawn wasn't going to some kind of magnetic field, like what this motor is doing, it would definitely be shorting it. This motor isn't, but because it's so inefficient, it almost is. The motor is really just a demonstration/afternoon project, I'm not trying to develop the next new motor for the Toyota Prius here :)

  • @Voltage412 Wall power is 120VAC, not DC, so the north/south properties of the rotor will be changing 60 times a second with the constantly inverting current. This motor needs a consistant positive and ground, or a current called DC, to operate. If you used a bridge rectifier to change the AC to DC, a capacitor to to steady the current a little, and a heavy resistor to minimize the power, you'll make a very clumsy DC power supply and it will work. But don't this it at home!

  • looks a bit dangerous :-( i was hoping to use the technique...

    did you learn it in high school? how lucky

  • It might look like it, but it is only DC (direct current) running at a low 12 volts. The arcing is only from the high amperage. The low voltage/high amperage properties makes this experiment safe, in this situation!

  • could u use copper wire

  • The wire used here is copper wire. It is surrounded by a varnish coat that insulates it so it's not a hunk of metal :) This kind of wire is called magnet wire, and yes, that's all it is. Copper wire with a thin insulating coat.

  • You can tell radio shack is not doing well when the Employees have the time to make videos like this...

  • you like popsicles

  • LMFAO! i wonder if he keeps them in the basement in a freezer..

    ok kidding kidding!

    good video btw, i was thinking of making a large scale one of these....using Pillow blocks....with 20mm bearings!

    (im not kidding lol)

  • I will try making one of those motors, then I will plug it into the wall and see what it does.

  • why the hell is it sparking

  • You are short circuiting the battery!

    It'll get really hot.

  • oh man, that battery is a monster, jajaja me more careful with that

  • lmfao!!! u talk just like that guy on faily guy!!! with the whistle when he talks...the old guy.....the one who loves chris

  • It's the microphone and the crappy recording, I swear! :D

  • ah yes the old pervert

  • you mean HERBERT THE PERVERT!!!!! lolz... my brother does voice impersonations... the perfect mock-up of herbert the pervert... lolz

  • prty sweet

  • oooo pretty i'll make one for my science project :D

  • Why did u use the big Pb accu battery? Do u know, how many A was in the circuit? My guess about 5 Amperes minimally!! The coil maybe was so hot, or not? The voltage was very high to this shitty small coil. The impedance of the coil is small and it takes to high current, which can blow up the wires including the coil ;-) I have some battery like this, from UPS, 7Ah, it can give current about 50A.. That is so much... Be careful experimenting with these batterys!

  • Most brushed motors arc, or "spark", but it's hard to see in the light. For example, walk into a dark room with a cordless drill and gun it while looking into the cooling vents. Unless it's a really fancy drill, the backside of the motor will light up like a little bulb. This motor's light show came up 500% better on my terrible phone camera compared to what I saw when I was filming it.

  • hes using high amperage from these batterys causing the spark, i have a couple of these batteries and they are powerful im surpriesed that it didnt melt those alligator clips!

  • The battery would start to smoke before the alligator clips would melt.

  • trust me no it wouldnt!

  • The sparks mean u have to high of a voltage, and thats why it got hot.

  • This is the first time I've seen a DC motor spark!

  • Hahaha thats cool like to run it in the night and just watch the show...=]..

  • really really SPARKY!

  • SPARKY!

  • that was pretty cool

  • nice max good work

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