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Picture of Simple dc motor with forward/reverse and self starting
Grandson Nicholas and I developed this simple motor for his school project. We checked the web for ideas and then evolved this motor that has a number of unique features that make the motor easy to start and run.  The motor also features a forward-reverse and speed control.  

The motor armature rotates due to magnetic pulses created by a pulsating current that flows through the armature coil - these electromagnetic pulses interact with the rare earth neodymium permanent magnets (the "field" of the motor) and cause rotation to take place. The neodymium magnets are mounted on the sliding "direction and speed control" bar. Sliding the magnets under the armature gets the rotation started. 

Step 1: Video with operating and build info


 
bobschukes made it!6 months ago

This was a great project, thanks for posting. My son and I made it for his school science fair project. We made a "head to head" model, one with 3 volts, and one with 6 volts to show the difference in rotor speeds with higher/lower voltages. We mounted the motor sticks with mirror clips, and used a metal coat hanger to make custom bent posts for the rotors. This eliminated the need for clay to hold the rotor in place. we also soldered the battery wires to the posts and epoxied the posts into the base.

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nlinventor (author)  bobschukes6 months ago

Wow that's great, thanks for letting me know!

ptroolines1 year ago

Very clever, and interesting use of some simple items. Thanks for sharing your motor.

nlinventor (author)  ptroolines1 year ago

Thanks ptroolines!

I like the way you use the ceiling hook to support the coil. And it is a detailed instructable too in my opinion! I think i'm gonna make another one following your guides! And maybe you could also use paperclip as another easy to find yet cheap substitute for the ceiling hook. But it won't be sturdier as the ceiling hook, also i'm pretty sure that the neodymium magnet will be attracted to the paper clip.

nlinventor (author)  moimoipalamoi1 year ago

Your right moimolpalamoi re paper clips. Another idea that I didn't try yet is using a long brass wood screw instead of the brass ceiling hooks. If you can find a slotted screw you have a great ready made holder for the axles. Plasticine would probably be needed here too but the screws would likely be cheaper than the hooks. I paid about $1 each for the hooks I used in this instructable.

rimar20001 year ago

Very interesting design, and good construction.

nlinventor (author)  rimar20001 year ago

Thanks rimar2000!

gholam1 year ago
woooow