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dcpyatt
Starting Member
USA
8 Posts |
 Posted - 05/10/2009 : 9:12:33 PM
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Hello, my name is DaveP and I live in the state of Ohio in the USA.
My interest here stems from my desire to build a non-traditional electric motor/engine and utilize it as a traction motor. Obtaining near unity would be a huge bonus!
I am also gaining interest in the Berdini principles for charging secondary batteries as this would be great in my application as well.
I currently own 2-1/2 street legal electric cars (the 1/2 needs a drivetrain and a body) and I want to develop something that I can utilize in an EV of my own construction, just so I can say that I did it.
I am a founding member of our local EV group and act as webhost and Yahoo group administrator for that group.
I am a Healthcare IT Systems Support Technician by day, but would love to retire to the EV world instead.
DaveP in Ohio
dcpyatt@jclay.com
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comwarrior
Moderator
United Kingdom
477 Posts |
Posted - 06/10/2009 : 06:47:36 AM
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greetings dave, welcome to TEEP.
I see we have quite a bit in common (IT support).
Im looking into building my own EV from scratch, it's one of those i want to, but need to know everything about making it street legal first...
We cover various areas as you can see, most of us have families and comitments etc so generally most people are not on untill the weekend...
I however am self employed so i'm for all intents and purposes, resident (my sleeping bag is around here somewhere ;) )
I'd love to see some pix of your EV's both inside and out and some details, i think posting EV's on here would be good to stir people up and make them realise that petrol is not the only solution...
My pulse motor is aproximatly 0.5 -0.6 watts, I'm guessing you'll be looking at something 100 or 200 times bigger...
Take a look around and don't be afraide to ask questions...
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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cass
Senior Member
USA
138 Posts |
Posted - 06/10/2009 : 1:58:21 PM
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hello Dave, welcome
i have also been looking into electric vehicles for a while. i went to high school for automotive so it has also been an interest for me. i have a quick question, in your EV does it use an AC motor or a DC motor?
carmin |
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teep
Forum Admin
United Kingdom
347 Posts |
Posted - 06/10/2009 : 2:26:12 PM
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Welcome to TEEP Dave.
Electric vehicles are an interest of mine and have been for many years especially the Enfield 8000.
The Bedford CF Electric Van was one of the best I have owned with a lot of mods of course.
Would love to give more details on my builds and ownership of EV’s but that’s for the future on this forum for me.
Yes comwarrior I know it’s a bin there got the T-shirt and cut the sleeves of and used them to clean the EV last night. If I was to give more details everyone would no I’m ID.
Yours theDaftman TEEP forums administrator.
See my videos on YouTube.
http://uk.youtube.com/theDaftman |
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comwarrior
Moderator
United Kingdom
477 Posts |
Posted - 07/10/2009 : 04:44:43 AM
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ID - Insanely Demented?
I have an EV... well, 2 of them... 1/10th scale... lol ;)
When it comes to EV... I'll allow an extended amount of whistle tooting... lol ;)
I want one... build one myself from scratch... really should look up how to get a custom build car registerd...
Our wonderfull government actually has a tax on EV's... My next door neighbour's mobility schooter has to have a tax disk...
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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dcpyatt
Starting Member
USA
8 Posts |
Posted - 07/10/2009 : 06:41:40 AM
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Hello again, all...
I tried to reply last night, but submitted just as the host went to maintenance, so hopefully I won't forget anything that I said.
My EVs are all what we call C-Cars... the partial is a 1974 CitiCar, the running car is a 1980 Comuta-Car and the newest project is a 1981 Comuta-Car.
They are all US production EVs that are 50-state street legal as a regular automobile. The CitiCar would have most likely been an early enough model to have been equipped with a 3.5HP General Electric 36 volt series wound DC motor attached to a Terrel axle. The Comuta-Cars are setup with a 6HP General Electric 48 volt series wound DC motor. The 1980 is still running on mechanical contactors setting the speeds at 18V, 24V and 48V. The 1981 has started to be converted to a solid state Curtis conrtoller, but was left unfinished by a previous owner.
Our club has a Miles that we are going to be experimenting with different AC drive configurations, but AC is so expensive compared to DC that it will be a while before I personally will be able to afford an AC conversion vehicle.
I don't have pictures of the newest one posted yet, but here are links to the other two...
www.evalbum.com/1344
www.evalbum.com/1345
DaveP in Ohio
dcpyatt@jclay.com |
Edited by - dcpyatt on 07/10/2009 06:43:57 AM |
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comwarrior
Moderator
United Kingdom
477 Posts |
Posted - 07/10/2009 : 09:44:25 AM
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Honestly, i don't get the reason fo using AC motors when your power supply is a DC battery pack...
I also can't understand why a manufacturered EV has to be so expensive ether...
But nice pix...
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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dcpyatt
Starting Member
USA
8 Posts |
Posted - 07/10/2009 : 11:02:23 AM
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AC is supposedly more efficient than DC, with the power band spread out more evenly. DC loses torque as RPM rises. My thought has always been to use a transmission and change gearing as the powerband fades to regain the lower end power, but opponents say that the additional weight and rotating mass are negatives.
Also AC systems use higher voltage so they require less amps meaning smaller wire sizes and less chance of electrical shock hazzards from higher amps.
My 1981 Comuta-Car should be coming online shortly as www.evalbum.com/2942
DaveP in Ohio
dcpyatt@jclay.com
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cass
Senior Member
USA
138 Posts |
Posted - 07/10/2009 : 11:53:46 AM
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also AC systems are able to add the rejunitive braking into the EV. this means that while you are coasting or slowing down, you don't have to push on the "gas pedal" therefore the AC motor acts like a weak alternator. this is the concept that the tesla car uses.
but what i don't understand is how come you can not add multiple alternators on the wheels of the car to help charge the battery packs. my design that i drew up for when i start to build my vehicle i will be putting in 4 low input high output performance alternators. one for each wheel. these will also be connected to the wheel in a gear-training pattern.
i think electric cars, or any electric vehicles are going to be the way to go. right now the hardest thing to take in consideration is batteries. if we can find a way to get rid of the battery (because of how expensive and how often we have to replace them) the electric vehicle will be golden.
carmin |
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comwarrior
Moderator
United Kingdom
477 Posts |
Posted - 07/10/2009 : 1:55:30 PM
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ok, both my RC cars reclaim the power from an idoling motor... and the use a DC motor...
I'm struggling in believing that an AC motor is more powerfull than a DC... Especially when you take into account that your loosing power when you convert DC to AC...
Higher volts, lower amps... but the same Power (Watts!)
Besides... anything over about 80 volts AC starts becoming lethal...
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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cass
Senior Member
USA
138 Posts |
Posted - 08/10/2009 : 12:26:15 PM
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RC Cars are we talking about like remote control cars? i don't see how they would reclaim power from an idoling motor....is the idoling motor a gas motor?
as far as i know, AC setups are more efficient when regaining energy than that of the DC setup.
also i am pretty sure that the ac setups are much like a regular car setup, meaning that the gears they use are very similar and the torque provided too, where as the DC setups i think are known for damaging transmissions due to their high torque.
DC setups are more low-end set ups..this means they have more torque than overall speed and output
AC setups have more speed capabilities. as so im told..
also DC setups have different types of controls and inverters. these are not matched to the individual motor itself. if the controllers power stage fails the entire voltages - usually 120 to 140 volts or whatever your system is running on is applied to the motor causing the car to instantly take off. people who race electric cars on the drag strip cause a surge so they can accelerate and get to the finish quicker than any gas car on the market today.
ac systems have matched controls and inverters to the motor itself. if one of these systems fails the vehicle will come to a slow stop.
from what i learned and was taught at school, if you are going to race the car - go with the DC system. if you are going to drive the car - go with the AC system
carmin |
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comwarrior
Moderator
United Kingdom
477 Posts |
Posted - 08/10/2009 : 1:43:35 PM
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Well, this is the 'diesel V petrol' argument... so, i'm going to leave it their because i allready know all the points of argument...
However, you are wrong about RC electric cars... the Cheep speed controlers don't have a reclaim system on, but the more expensive ones do, and the more expensive ones have EMF breaking... so thats LENZ's law put to good use...
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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cass
Senior Member
USA
138 Posts |
Posted - 08/10/2009 : 2:28:53 PM
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well first off i think you misunderstood me, i am not talking about RC cars i believe this topic started talking about real Electric Vehicles. i was simply asking you if you were talking about the Remote control cars and then i stated i didn't know that they can reclaim power, and i believe i asked what type of motor is idoling for this to work.
i dont see where you got the diesel versus petrol argument from but thats alright..
carmin |
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dcpyatt
Starting Member
USA
8 Posts |
Posted - 09/10/2009 : 9:11:49 PM
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Boy did I get confused quick... :) I think Comwarrior made a comment that he didn't realize and it shifted things all around!
quote:
ok, both my RC cars reclaim the power from an idoling motor... and the use a DC motor...
Yes, my EVs are people movers... small, but people movers :)
As for additional regeneration, I have been told that you can do it with DC, but it is alot harder and very inefficient. We have an electrical engineer that designs controllers for a living in our EV group, and he is quite facinating to listen to when you can keep up with him!
As for adding more units to recover more power, I think that you start to add more friction and lose more than you gain...
Anyways, I am ready to get started with trying to prototype some of the ideas that I have had. I woke up in the middle of the night last night and during my semiconscious state I repeated some ideas that came to me to the point of being able to transpose them to paper while I was in a semi-cohierent state... now if I can read my writing it will be another story!
Can anyone point me in a good direction to read up on the winding of an electromagnetic coil such as one used in a salvage yard for lifting scrap metal (in a much smaller scale obviously...)
DaveP in Ohio |
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Introduction - dcpyatt (aka DaveP)
