Small generator prototype
Find out about our small electric generator prototype, using a single neodymium magnet.
Objective: to build a small simple electric generator which can power 230 V bulbs AC.
How it works ?
The rotating magnetic field induces an ac voltage in the stator windings (coil ).
The rotor’s magnetic field is produced by the neodymium magnet sphere.
The permanent magnet field is constant and the terminal voltage varies directly with the speed of the dc motor.
This is an AC electric generator which lights up led bulbs 7 W 230 V and is composed of a coil without core (iron less) – copper wires, a magnet (neodymium sphere) , dc motor, a metal screw pot case, a plastic holder and a battery.
Note : Using different spheres, dc motors, batteries and coils we have managed to light up a 75 W 230 V bulb https://www.youtube.com/watch?v=Ud3fMcn7GAw
About generators in general :
Electric generators are devices which are using alternating magnetic fields to create a current through a wire circuit ( alternating current) AC. An electric generator converts mechanical energy into electrical energy by generating voltage (EMF) that forces electrons to flow in an electric circuit. This is called electromagnetic induction.
Warning ! High Voltage!
How we build it :
Materials we used to build the small generator:
1. 3V Dc motor – inside toys which using two batteries 1.5 V AA – simple generator component
2. coil without core inside syncronous motor 230 V – A4 laminators, microwave turntable motor – simple generator component
3. neodymium magnet sphere 12.7/13 mm
4. neodymium screw pot metal case 12.7/13 mm – remove neodymium magnet from the metal case – key generator component
5. plastic conector used to fix screw pot metal case – dc motor ax inside car toys – heat the crew pot metal case to fix the plastic conector – simple generator component
6. plastic and metal components from mechanical construction kit – used to build the holder for dc motor and coil – simple generator holder
7. 3.7 V battery 600 mAh or a related battery
8. 230 V led bulb 3W – 7 W + E 27 socket 230 V
9. power switch + wires
we removed the plastic component from the toy car case
we removed the magnet from the neodymium screw pot metal case
we removed the coil from the syncronous motor
we attached the screw pot metal case to the dc motor ax through the plastic connector
Creating the small generator holder using the plastic kit
Connecting the wires to the dc motor and battery through the power switch.
Connecting the bulb using the wires to the coil output ( in Ac output it doesn’t matter the connection order, only in dc is very important),
WARNING ! we do not encourage people to replicate it !!!
the position neodymium magnet sphere 13 mm – screw pot metal case (magnetic catch ) between magnetic poles (N and S)
We did not used magnetic materials (screws , etc ) for the simple generator holder near the neodymium sphere – it will act like a magnetic brake for the sphere.