carlege

Also im not sure how this would work but can you liquid cool the casing of an electric motor? Would it be more efficient if you did that?

Ronin-951

DC vs AC. A DC Motor takes care of 99% of the Control Electronic's by virtue of it's Commutator, Speed is controlled by Volts and Amperage Input which in turn builds the Magnetic Field. Voltage is limited by the value of the Winding Insulation Varnish, too much Voltage and you get a hole in the Varnish which lets the Smoke out. Same effect as Lightning, - Ground to Cloud following the Ionization trail - sudden big Flash and Boom. Best to avoid that, so Voltage is set at a compatible level to the Insulation. Insulation Varnish COULD be made to any value but that would affect the Coil Wire density/spacing, thus the Magnetic Field strength, and gets prohibitively expensive in a non-linear manor. Small DC Motors use Voltage Control over Amperage Control because the Insulating Varnish values start at a fairly high resistance with the lightest of coats, and Amperage Control is Hot and difficult. Rheostats are often used on the smaller Motors, as size and wattage concerns are easy to manage in low output situations, KISS. Raise the Output numbers and the physical size, weight, and wasted energy of the Rheostat becomes overwhelming. Working Hi-Power Solid State Amperage Control has only been around for about 15 years, previous models would run-away and refuse to be throttled, forcing a complete shut down in order to regain control.
AC Motors are way more difficult to employ, Speed is controlled by the Frequency of the incoming Sine Wave. A Freq. Generator now has to handle and condition the total power delivered. Typical 1hp Units are two times the size of the Motor, with the ratio increasing as hp increases due to heating. Resonance factor's are introduced as well, causing somewhat unpredictable flash Shorting events to occur within the Motor itself. That issue was also lessened about 15 yrs ago by the addition of a Grounding Brush between the Rotor and Case. Variable Speed AC Motors have their own Class now.
The real questions about EV is the method of control. Formula 1 illustrates just how difficult that can be, a basically unlimited budget by the best of the best can only manage that 75% of the time for a lousy 80hp. Not saying that what we have now doesn't work, but the heat is unbearable.

333pg333

KERS

ausgeflippt951

Whose cells are you using? You mention LiFePO4...A123? That technology is decent; albeit pricier than they should be. I've used both the 26650 cell and their prismatic. The performance of the 26650 is *fine*, but the prismatic are really excellent.

I've done a couple electric conversions; in a Mercury Milan we used a Boston city bus motor -- really good choice. They're fairly cheap and produce 200hp, even if they aren't the most efficient things out there. Plus, integrating a motor controller is pretty straightforward.

Chris White

Yeah, but exactly how do you turbo charge an electric car......:P

jc in rb

"Yeah, but exactly how do you turbo charge an electric car.." Excellent point........!

V2Rocket

plug it into a wall where it gets electricity generated by a turbine

SCEV

Not 100% sure yet, but definitely one of the prismatics. CALB seems to be in the lead right now, but are a little more expensive. Winston seems promising, but I can't get them to return my emails for a quote. Sinopoly also seems good, but I haven't seen any cells actually used yet to get decent feedback.

Whichever one I go with, it will be between 65-75 cells in series, using somewhere between 100-130 AH cells.

eman930

Ive seen this done before, cool project, But I never get the point, Why waste the money to have a sub par electric car, It will be not as good as the hybrids on the market including the plug-ins.. And it won't be as good as the engine you pulled out (performance wise), So
Why not just get a High end Golf cart and load it with batteries and save a lot of work? Maybe that's just me but, I def give you respect for trying to build
It yourself

SCEV

In what way? It will certainly be better looking (I don't know why they insist on making ugly hybrids/electrics), and will also have better acceleration (except for a Tesla on both those points). It also won't use ANY gas or require ANY oil changes.

Sure it will...planning between 172V-192V and up to 1000A at the motor, which equates to roughly 172kW-192kW or 230hp-257hp. I think the stock 86 951 is 217hp.

eman930

True, and again please don't feel
Like I'm bashing your project, it's a cool project and I probably just need to learn more.... How long can you hold top speed? How many times can you do full acceleration runs? What will your top speed be? What's your range before having to recharge? And how much will this effect handling? How long will it take to fully recharge?

manticore33

My only concern with EVs is what the electric companies will do to us consumers. With the storms that passed through my region a couple of weeks ago AEP has already petitioned PUCO to raise our rates to "cover the repairs."

eman930

Yea Long term plug-ins are trouble, Power plants can barely keep up with air conditioners in the summer, and the electrical grid isn't designed for full blown plug-in use.. Right now it's ok but when the whole population has them we are in trouble

Cole

Any of you guys ever looked at the layout of the Tesla motors? Looks like one of their systems would almost bolt right into the back of a 951.....now to find a wrecked Tesla...and if you haven't driven one....you need to!!!

manticore33

I wonder if the powertrain would still brick on you...