How to connect a wind car alternator

[Alain G]

Try this with the ratio from the start.

[darwenn]

The problem is that I don't understand anything about calculating ratios

You said "The 3: 1 ratio eg: 6 cm driving pulley and 2 cm generator pulley, 5: 1 eg: 10 cm driving pulley and 2 cm generator pulley.
"

I can hardly imagine that with a pulley of 10 driving and 2 in generator, that I can have more revolutions / minute than with a pulley of 28 driving and a pulley of 4 generator, I understand nothing that me doesn't seem logical . The engine will not run faster than what I have gotten so far. That said if you confirm to me that if then I want to try, but here I am skeptical To confirm

[Alain G]

Go with 28: 4 with the roller tensioner with little pressure.

It is very difficult to judge the speed to obtain without instruments, here I have an industrial tachometer anisi that what it takes to vary the speed of the generators.

But I doubt that this engine is a good generator.

I don't want to waste your time with tests which may not be conclusive, usually we use a motor which has a little more operating voltage, for example 36 volts to obtain 14 volts at a reasonable speed, more this motor is a starter which is not made to run over a long period, therefore with a lot of torque but a lower voltage than a normal motor, probably capable of operating continuously on 6 volts.

A car blower motor would surely be more adequate.

[darwenn]

For the motor used, it is indeed a motor like any DC motor, it is used as a starter in model building but also used for other applications like other DC motor, it has no other specificity that makes it something more than a simple DC motor. It must be connected to a car type battery given what it provides. It is powered by 12 Volts and driven at good speed with another identical motor I had drawn near 20 Volts 15 amps. But hey if I manage to find a motor powered by 36 volts maybe I could get 15 or 16 as you say, I know too much there, already where to recover this kind of 36V motor? I have never seen one, and do not know where I could get one. There I really think that by rewinding my rotor with 7 times more thinner wires, I will multiply the voltages by 2 volts by 7, so 14 volts when empty at identical speed (but with a loss of power) there, I could m 'get out of it and that's the question I asked to get an opinion on it.v

I would like to find a tour account, it will surely help me but I do not know where I can find that, I have a look at the electronic bike counters, none of them do tour, it is on that by bike we don't care how much our wheel turns, just like me I don't care how many kilometers my propeller will have traveled today .. Snif

[darwenn]

For the blower motor are you talking about the motor of a car radiator fan?

[darwenn]

Hello, here after more precise calculations, what about my wind turbine.

The generator needs to run at 3500 TRM to supply 12 volts. There it provides 2, so it only turns 582 TRM.

The generator pulley measures 4 cm in diameter, the power train makes 28. This gives a multiplier of 7 (for 1 drive turn, the generator makes 7 turns).


So that the generator turns at 582 TRM, the drive pulley turns at 83 TRM, this is indeed what I calculated by observing the average speed of rotation.

So I currently have 2 volts for 582 TRM of generator, I would need 16 volts with the same TRM. For that, I would have to modify the winding of the generator rotor.

Analysis:
The rotor currently has 8 turns of wire per location. So 8 turns give 2 volts currently at 582 TRM.

To have 16 Volts at 582 TRM I need 8 times more turns, which makes a total of 64 turns per location. That would give me 16 Volts at 582 TRM. With finer wire, it will hold in the slots.

Voila, what do you think of my analysis, is that correct?

[darwenn]

good, so then (sorry for this monologue but everything I do will surely be useful to others). Lefou, who I am, started rewinding the rotor. And it works. I noted the original winding, which was connected with whom, the order, etc. In short, everything is ok, I recovered thinner wire in an old transformer, but still too large, which did not allowed only to wind 32 turns instead of the 64 that I had calculated.

By plugging the motor into the battery to check that my winding would make it turn, nikel it turns, but much more slowly (which is normal) with a good torque, I did not think of measuring the current consumed, but I will do tomorrow.

With the current regime, I take 10 volts to vilde instead of the 2 before, it is much better no ??? I multiplied by 5 the voltage at identical speed with 32 turns. Tomorrow I will buy thinner wire and wind my 64 turns, which should give me a groin of 20 volts at less than 600 rpm.

In short here is the photo of my nice rewind, I spent time there (all afternoon) but it was for a good cause.

[Alain G]

Well done Darwenn!

Nice work!

Does your engine have ball bearings?

[darwenn]

No, these are removable rings but which can be easily replaced by bearings, I have also noted the dimensions. But no problem the manufacturers or resellers of bearings in my corner are closed for the holidays, but as this is a modification that I plan to make, I will order them on the internet.

[Other]

Hello

By plugging the motor into the battery to check that my winding would make it turn, nikel it turns, but much more slowly (which is normal) with a good torque, I did not think of measuring the current consumed, but I will do tomorrow.

An unknown DC shunt motor without indication you plug it in low voltage. If you apply 12 volts to it when empty the motor will run until it generates 12 volts and its current consumption will be very low (just the losses) as soon as you force it while braking
the shaft the RPMs decrease the generated voltage fcé.m decreases, it is this difference between the power source and this generated current which allows the amperage to increase in the motor.

A DC shunt motor is a generator

Andre