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How can I combine a salvaged auto turbocharger and a generator to make electric power? Answered

I am considering a hybrid engine for a golf cart.  I want to take a salvaged auto turbocharger as a base, use "alcohol" for fuel, and generate electricity for the electric motor of the cart.



Best Answer 7 years ago

I've thought about doing the same thing. I think so, anyway. Are you talking about collecting the exhaust gas from the exhaust manifold and feeding it into the turbo in a normal manner and, instead of pulling air at a boost for injection into the engine, letting the engine continue to function in a naturally aspirated manner, while replacing the compressor wheel of the turbocharger with a shaft that turns a generator head of some sort and then letting the exhaust that is colected in the impeller continue through an exhaust pipe in a normal manner? That way there is no boost increase in the intake of the engine, but instead there is a generator that is producing electricity?

Like I said, I've thought about doing the same thing. Some time ago, I had a similar idea, so I started searching for information about such things and I actually saw what was either a mock-up, or a functioning unit somewhere on the Internet. I've not been able to find it, again, despite many attempts to do so. It was from what appeared to be a very small company and it looked like a prototype. They used what appeared to be a brushless DC motor from a remote controlled airplane or vehicle as the high RPM generator. It was something similar to this:


The tricky part as I can tell is matching the shaft speed from what was once the compressor wheel to the right brushless DC motor. You want to make sure that the motor is able to run at high enough RPM's, throughout as much of the powerband of the engine, to generate electricity, without exceeding the RPM limits of the motor. It wouldn't do much good to either burn out coils in a motor (generator in this instance) from operating at too high of RPM's for its rating and it wouldn't do much good to turn a motor too slowly, thus not utilizing the full potential of the motor as a generator.

If I ever get one built, I intend to install it at the back end of the exhaust system because lag won't be an issue, as it won't be delivering additional boost to the engine and there is generally more room to work with near the end of the exhaust system than there is off of the exhaust manifold. After that, I thought that I'd use the electricity that is generated to produce HHO, hydroxy, brown's gas, etc.

Here's another design that I just found.


It is difficult to tell from the image, but it looks like they may be using something a bit larger than one of those brushless DC motors that I showed you? Maybe they used something similar to a PMA design? I wonder if a treadmill motor would work? Again, it is all about matching the RPM's of the engine exhaust that spins the shaft to the generator's output range.

I hope this helps you out in some manner?

you may use a waste heat gate controllor in order to have constant rpm at turbo shaft in order to match with that of generator, for that you will have to pass or by pass the exhuats flow to turbo charger.

A couple of things I may have wrong:
A :gas turbine" is pretty fuel efficient if it runs at a constant speed and is optimised to operate at a constant speed.  I am looking for constant output, not "afterburners." 

B: I see the difference in RPMs as a problem and I am not dismissing it by any means, but, turbine engines power Helicopters and Tanks, so while it is difficult, it is not impossible. 

I'm imaginering having the shaft of the jet engine a spinning magnet, and coils around it, but somehow I'm sure it won't be that simple....


8 years ago

Hhhmmm, maybe using the turbo on a lawnmower engine so that you can mate it to a bigger generator could work. 

Not sure how much of an advantage it would be, but the awesome factor would be immense!

Matching a turbine (c. 120,000 RPM) to a generator (<=3200RPM) is not at all easy.

Yes, "a bit tricky" is understating it I think.