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Discussion Starter #1
I had a guy from another forum pose a question that opens up a whole new can of works with my hybrid project, I wonder if someone smarter then me can shed some light...

Some basics on my project if you haven't seen it in other posts:

72v drive motor, likely the new big Etek, the 1003 with likely an alltrax 7245
10hp diesel sitting above Etek with a centrifigual clutch leading to a second sprocket on the Etek

When speeds of over 50mph are reached, fire up the Diesel and it would "push" the Etek along.

Now, the diesel would have about 2kw "left over" after doing its job of moving the trike. my original intent was to find a 2kw x 72v efficient motor to use as a gen.

but...

He suggested engaging Regen on the main motor to the extent that recharging would be needed.

Now, I have heard some awful low numbers in the way of Regen efficiency, can someone help me understand if this is a path worth pursuing, or should I just go with a separate gen?
 

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If I understand correctly, what you are looking to do is not really regen, it is plain and simple power generation. Regen would be using the deceleration or downhill motion of the trike to capture power. The inefficiency of this system comes from the fact you are trying to capture tons of power in a very short period of time. If you are simply "loading" the diesel a bit more to charge your batteries there should be no problems with the setup as long as your motor/controller are capable of a "regen" mode even though that technically isn't what you are doing. The much lower power and longer duration of this should help you as far as efficiency goes and would act much like the alternator on a normal vehicle.

It would probably be a much lighter and more elegant solution to use the main motor instead of adding another motor for the purpose.

Good luck.
 

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Discussion Starter #3
Thanks RWaudio, I have an email in with the Kelly people regarding the efficiency of the controllers in Regen mode, one would think (hope) that its as efficient one way as it is the other :)
 

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Just dawned on me that (And this would be about the coolest problem in the world to have) with a body as aerodynamically slick as this one, coasting downhill could get to be quite a problem on the brakes, great if there was the regen..
 

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Wondering, all things being equal, it looks like Mars has a brushed:
http://www.thunderstruck-ev.com/index.php?dispatch=products.view&product_id=135

Brushless:
http://kellycontroller.com/mars-0913etek-comparablepmsmbldc-motor-p-874.html

Versions of the new beefier motor.

I am wondering which one would be more efficient in driving, AND regen

The brushed with this controller:
http://kellycontroller.com/kdh07601a24-72v600a-pm-with-regen-p-64.html

or the brushless with this one:
http://kellycontroller.com/kbl72501b24-72v500abldc-controllerwith-regen-p-266.html

It seems like I read somewhere that brushed motors didn't like regen, something about arcing brushes?

And the brushless motors aren't quite as efficient?

Thanks for the input guys!
 

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Given the similar power and not too different pricing I would probably lean towards the BLDC version because Regen has been known to work well with those motors. I don't know much about regen though, since for the power level I wanted the only choice was Series DC which doesn't do regen I stopped looking at it. Even in a basic form the BLDC gives more regen options, that may allow you to tweak it better for both power generating regen off the diesel, as well as real regen to save your brakes.

Good luck, the whole project is pretty cool!


Wondering, all things being equal, it looks like Mars has a brushed:
http://www.thunderstruck-ev.com/index.php?dispatch=products.view&product_id=135

Brushless:
http://kellycontroller.com/mars-0913etek-comparablepmsmbldc-motor-p-874.html

Versions of the new beefier motor.

I am wondering which one would be more efficient in driving, AND regen

The brushed with this controller:
http://kellycontroller.com/kdh07601a24-72v600a-pm-with-regen-p-64.html

or the brushless with this one:
http://kellycontroller.com/kbl72501b24-72v500abldc-controllerwith-regen-p-266.html

It seems like I read somewhere that brushed motors didn't like regen, something about arcing brushes?

And the brushless motors aren't quite as efficient?

Thanks for the input guys!
 
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