98247Views24Replies

Author Options:

Can I use a motor to make a generator? Answered


I once heard that you can take nearly anything in electronics and use it in reverse, headphones to a microphone, a radio to an fm transmitter... well i have 2 small motors, one from a cd reader (the part that spins the cd) and one from a pencil sharpener. They are pretty straight forward... connect a battery to them and they will spin, but if find some way to have them spin, will it give me electricity back? i want to make a mini windmill... is it possible is there any other additional wiring I'll need to do? thanks...

24 Replies

user
Chowmix12Best Answer (author)2010-06-18

Of course! a motor will generate electricity when spun with mechanical energy. A wind mill will work. if you want to charge batteries or such, you may want to use a diode, as it will prevent electricity from flowing backwards into the motor and causing the motor to run as if it were connected to a power source. if you have any questions, just reply!

Select as Best AnswerUndo Best Answer

user
davej6694 (author)Chowmix122010-06-18

thanks for the reply, do i need a certain type of diode? can i use an LED for one? i heard you could?

Select as Best AnswerUndo Best Answer

user
Chowmix12 (author)davej66942010-06-19

in theory, you can use an led, but that supports a very minimal amount of current to pass through. you would have to use a current limiting resistor, and that means your energy is being wasted into heat energy. I've attached a picture of a diode. you can either buy one at radio shack, or you can scavenge on off of almost any circuit board. I have seen 4 in a AC charger, or you can even try a disposable camera (free at walgreens, just ask!). desolder it and you can use it! put the black side (opposite of the white strip) on the positive side coming from your motor, and the white strip is your output. you can trickle charge batteries, or a voltage regulator for a USB charging hub! Cheers!

Select as Best AnswerUndo Best Answer

user
Kiteman (author)davej66942010-06-18

Have a look at the various wind-turbine projects on the site.

Select as Best AnswerUndo Best Answer

user
Aryan__ (author)2018-02-05

Can i make a generator using motor which is able to charge an android mobile phone

Select as Best AnswerUndo Best Answer

user
edwinl33 (author)2017-03-17

my 12v dc motor won't light even a small led light.

Select as Best AnswerUndo Best Answer

user
Fendic (author)2016-04-22

hi..i use dc dynamo motor to my small wind turbine..but it just produce 4.5v..how can it reach 14v ?please help me/

Select as Best AnswerUndo Best Answer

user
RelientOwl (author)2010-06-19

Of course! they're the exact same thing however if you want to charge battery's (Rechargeable's only) you will need to add resistors to the circuit.

Select as Best AnswerUndo Best Answer

user
sijithskumar (author)RelientOwl2015-07-05

Could you please explain further on what value resistor should I use and where it should be placed.

Select as Best AnswerUndo Best Answer

user
rickharris (author)2010-06-19

All DC motors - perminant magnet motores - will act as a generator if you drive them. You will get close to the level of power it required to drive the motor. i.e a 6 volt motor will give close to 5 or 6 volts out as a generator. BUT not a lot of current. Stepper motors work well in this.

Select as Best AnswerUndo Best Answer

user
farmer53 (author)rickharris2011-04-24

howdie were would you find such a motor what do l look for new at this wood alt work from car thks

Select as Best AnswerUndo Best Answer

user
rickharris (author)farmer532011-04-24

Stepper motors are most often found in old printers or scanners. They generally have several wires coming out of them.

A car alternator will generate about 14 to 18 volts provided you can drive it fast enough - About 3000 RPM.

Select as Best AnswerUndo Best Answer

user
ugdhslhudg (author)rickharris2015-04-12

hi

i know it have been 3 years ago!!

but i still hope u can answer me

i'm planing to use a car alternator on a tesla turbine it produce more than 15000rpm

is that ok?

Select as Best AnswerUndo Best Answer

user
conorgill (author)2013-08-12

Hi, i actually tried to do this by by connecting up a battery drill to the shaft of a motor to drive it. i then connected the electric motor cable to a light bulb, unfortunately i got no power back form the motor. Can anyone tell me where i am going wrong with this??

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)2010-06-18

Just bear in mind that, to generate the same voltage as the battery, you have to spin the motor at the same speed. An LED would be a bad choice for a diode, you really need something like a 1N4001 Steve

Select as Best AnswerUndo Best Answer

user
handuka (author)steveastrouk2010-09-11

what motor should i use for a 1N4001, how many volts should it be?

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)handuka2010-09-12

If you use a diode like a 1N4001, you need more than 0.7V from the motor.

Select as Best AnswerUndo Best Answer

user
handuka (author)steveastrouk2010-09-12

what about 1N4001& what happens if we give less input?

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)handuka2010-09-12

All you need is a diode, the thing that you need to worry about is the CURRENT rating (1N4000 series accept up to 1A), rather than the voltage. ANY conventional silicon diode will have a forward voltage drop of ~0.7V, so a source of less than 0.7V isn't going to deliver much current to the load at all.

If you are really stuck for volts, spin the motor faster, or possibly use a schottky barrier diode, which has a forward volt drop of ~0.3 Volts.

Steve

Select as Best AnswerUndo Best Answer

user
handuka (author)steveastrouk2010-09-12

how about 1N4007& supposing i want to attach a capacitor of 1F?

Select as Best AnswerUndo Best Answer

user
Arbitror (author)2010-06-18

If those are the electric motors I think they are, you will need to create a gearbox so the windmill blades move with the most gentle winds. That must be well lubricated, and you will have to create a charging circuit, or you can buy one on the net. If you aren't using a rechargeable battery, then I don't know what you have in mind for the final outcome!

Select as Best AnswerUndo Best Answer

user
lemonie (author)2010-06-18


There is a chemical (and probably physical) principal of micro' reversibility. Which says what you say about "use it in reverse". But motors differ, and doing the reverse means knowing how the forward works for the motor you have.

Do look around here for what other people have done.

L

Select as Best AnswerUndo Best Answer