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Thread: Building a window motor

  1. #11
    im looking to build one of these too, but lack of information on the net is making it difficult to understand

  2. #12
    confusing design
    Last edited by grounded; 02-09-2015 at 07:54 PM.

  3. #13
    and the windings... i thought the ' bi ' in the word bifilar, meant 2, so assumed it was 2 wires twisted.

    my understanding of electronics is pretty limited.
    Last edited by grounded; 02-09-2015 at 07:56 PM.

  4. #14
    is there something against having the coils close to the rotor in a window motor. Most other generators or motors the gaps between the coil and stator are a large factor in what you get out but i have seen window motors with inches between the magnets and the coils....why?

  5. #15
    I am setting up for a build...don't have as much handy as I would like but i think i can make something happen. I have 2 (1x1 with1/4 inch hole) cylinder neos...the idea i am shooting for is a high speed low draw motor to run low drag generator tests with. I want to have the two neos (which are diametrically magnetized so 2 pole motor) attached to a common shaft one magnet being the rotor for the Window motor one for a generator (probably opposite a flywheel). I have 24 and 26 wire on hand so i may need to use an external trigger instead of two different sized wires, think mine are to closely sized to work correctly that way. I do have a few old motors laying around that I could pull larger wire from though but nothing to measure the gauge. So does anyone have tips for my setup...anything that is not the normal knowledge on window motors because i have done a good bit of research. Just trying to bypass some hurdles people have already jumped without having to rewind hundreds of coils radiant energy has put a vacuum on my wallet!

  6. #16
    Senior Member Tom C's Avatar
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    the closer a magnet is to a coil, the more of it's gauss "cuts" across the coils surface area and the closer it is the stronger the area of gauss is that interacts the coil. for a DC motor it is usually a brushed commutator that switches the windings polarity first attracting then repelling to allow the rotor to spin inside the permanent magnet field. the window motor is powered by a pulse, first one way, then the other, the switching of the circuit acts as a brush commutator in the rotor. its a pulse switched DC motor. the dwell (on time) and timing determine the speed and torque of a window motor.

    here are my thoughts, this is not gospel truth just what I have read and observed..

    a window motor runs best under load at 2/3 of its unloaded speed. this can be modified somewhat by what kind of magnet and core you use. a torque window motor needs an iron or steel core, a speed window motor uses an aluminum core.

    the more powerful the magnet the more current it will draw to run, it needs to push that rotor away and the bigger the magnet the more force you will need to get it past. the recovery is also better with a more powerful magnet. (hence my experiment with the big neo mags on the other thread)

    your best way to start is with 20 or so gauge wire, you can run more than 1 strand in parallel to drop the resistance of the coil. it really depends upon so many factors. the more turns you have the higher the field of the coil, so look for a coil between 1 and 3 ohms. if you settle on a 1 ohm strand you can either do a longer winding or parallel 2 or 3 with higher turns to bring the resistance down. its a balance of wire size, turns and length.

    the full bipolar circuit is the way to go for driving, with a Hall sensor and timing disc.

    take a screwdriver and slowly move it into the magnet. when you feel the screwdriver begin to interact with the magnet, that is where you want the back edge of your coil wire bundle.




    Tom C
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    experimental Kits, chargers and solar trackers

  7. #17
    As always tom your a huge help. will be getting the final stuff together to start working on this thing. the neo i have is quite strong n45 (i think) 1 inch by 1 inch so it seems to go along with your recomendations i need to have the coil about 1 inch on the outside. So am i correct in the understanding that stranger magnets take more to run but you get about the same ratio of out to in...as you said it would have to be pushed away so more energy needed but also because the extra gauss a generator coil would output more...so everyone is looking for the sweet spot

  8. #18

  9. #19
    Quote Originally Posted by Bradley Malone View Post
    http://www.amazon.com/Effect-Magneti...20+hall+sensor
    are these good to use for a window motor.
    I recently bought this http://www.ebay.com/itm/151144779484...%3AMEBIDX%3AIT 2030 hall sensors, they can work up to 24 volts input.

  10. #20

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