Step 4: Step 4 (finish the Block)

this part is important part in making the motor work proporly
you must arrange the magnets two of the 4 magnets side by side as - and the and the other two side as positive. i learnt that the hard way the first time i did it i arranged the magnets +-+- instead of --++ .once you have that done that fill the hole up with silicone so that they will not fall out
Thanks for putting your ideas into a prototype. I think I have some old but big rotors from dead AC motors lying around and it would be cool to build a generator or motor from scrap parts. DC motors and generators are SOOOO expensive compared to their AC counterparts. Your idea has value! Thanks for sharing. You got my vote!
Thanks for putting your ideas into a prototype. I think I have some old but big rotors from dead AC motors lying around and it would be cool to build a generator or motor from scrap parts. DC motors and generators are SOOOO expensive compared to their AC counterparts. Your idea has value! Thanks for sharing. You got my vote!
i did do testing on this genorator it was produsing 3v at low speed thats hand cranking it and 12v at top speed spinnig it with a drill <br>i still havent seen its top speed as a motor yet but its like a bushinged motor . not ment for long use but if you put bearing holders in it and bearings it might last a long time and be useful
Nice I like that all the parts are common ez to get, and fairly ez to set up, I sure it works but wonder how well. Some testing would nice. But one thing I don't see is cooling this type motor have a lot cooling, some mods you may like to play with is clocking the brushes around some should change where it make its power at. <br> <br>I know some don't like the brushes or that its DC. At this scale DC is grate if your powering some needs DC, there loses in AC to DC conversion too. More testing I think is need see if make power that could useful even if not up to par with some AC gens if cost less and ez to make it still may have a place, or maybe just some thing fun play with. <br> <br>Now what you done is take U type motor and use it core to make a DC motor, or DC gen if you like, U type motor don't have the back EMF, why they are used for high speeds, so your core likely rated 10-20K rpm that maybe good, but does this make good DC gen core, it can turn high RPM, but what it make power wise and at what type speed and load, I think a lot more testing need done to say <br> <br>Thanks for the build 1/2 want to build one just try it I could a flop but could gold too, Tesla didn't get his at the time. <br> <br>Rat
This project should be entered for the Darwin Award. Someone with no electrical knowledge will attempt the build and electrocute themselves. It is called back EMF. <br> <br>AC was invented by Nicola Tesla to overcome the inefficiencies of DC generation. Sliprings are far more reliable than any DC commutator design. You will never match the power to weight to efficiency and cost using a DC commutator over an AC slipring design. Also the placing of the brushes on a commutator is very critical otherwise you will experience severe arcing. <br> <br>If you want to build a very efficient generator/alternator use a car or very heavy duty truck alternator. They all generate three phase AC which is rectified to DC. <br>
Agreed! Slip rings, which ride on smooth surfaces, don't hence have to experience the rasping wearing action of brush to segmented commutator. They can be<strong> extremely</strong> durable, &amp; car alternators usually outlive the vehicle!<br> <br> Automotive alternator slip rings however only carry modest currents (~a few Amps to energize the rotating armature), with the 30A range output taken from the fixed surrounding coils. This is low voltage 3 phase AC, which 6 diodes built into the alternator rectify&nbsp; to DC for battery charging.<br> <br> Go to a auto scrap yard, grab an alternator &amp; pull it apart - it's very educational!
Most universal appliance motors, electric drills, saws, hedge cutters, roto-tools, mixers and blenders and vacuum cleaners are of the brush-commutator design. So are the motors used in trolleys and diesel engines. They use this I guess because this type of motor is capable of light load high speed and low-speed torque. I don't understand the purpose of this project?.
I have read that a motor with brushes works indifferently on AC or DC. <br> <br>I never did the try, because all AC motor I seen are 220 V, and all DC motors are 12 V or less. And all my power sources are 220 AC or 12V or less DC.
well i haven't done any reading on this project or heard of it running indifferently but i have done repairs on ac and dc motors. <br> the dc motors use a fixed magnetic field with magnets while ac motors use the alternating to have a electrical endused magnetic field using magnetic wire <br>so thats why i think that there is a difference between the two types of source with the type of motor
Actually all motors are really AC motors - that's why there is a commutator (the thing the brushes slide across) - this turns the DC into AC through the coils (brushless DC motors do the same thing electronically). <br> <br>What you have there is a universal motor - i.e. one that will run on both AC and DC. You have just turned it from a motor with an electromagnetic stator to one with a permanent magnet stator. <br> <br>Actually, if you could replace the commutator with slip rings and powered it from AC you would have a synchronous motor - something really useful.
thanks for the information but i haven't heard of slip rings
You haven't heard of slip rings because they basically suck so they're not used much. As others have pointed out the motor you started with is called a universal motor. It would have run on DC just fine without any modifications at all. The only common motors that are strictly AC are induction motors. They run because of current phase change.
Slip rings are not that bad. Every time you drive your car or truck, ect you are using them. They are built in to the alternator, and I have seen them last for 280K miles and more.
Oh slip rings are just two conductive rings around the motor shaft that the brushes rub against - they are wired to the rotor windings and pass the ac current through directly (i.e. as ac) rather than periodically switching the polarity around as a commutator does.
You are right, all motors but an inductive motor will run on AC or DC. Look at the sign on the information tag, it must show AC / DC
Put enough batteries together in series and you'll have the voltage. Although today the more practical solution is to use a phase inverter.
If it was a universal motor you could probably also have rewired it to be a self excited generator. Or just applied a DC current to the stator coil to generate the magnetic field and used it as a DC generator.
Whilst to the conversion from AC to DC wasn't needed, the motor will now make a reasonable little generator! Try spinning it and see how much power you get out. It will probably work at quite low speeds. <br> <br>Thanks for posting, <br>
This is a cool project! And something I've considered doing before.<br> <br> However, as others have pointed out, your terminology is wrong. &nbsp;Judging from the stator you have pictured, it seems that you took it from <em>universal motor</em>, meaning it will run without modification on AC or DC.&nbsp;A pure AC motor looks far different than a universal or DC motor, and is also called an&nbsp;<em>induction motor.</em><br> <br> Cool idea nonetheless : )

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