Pages
Categories
Archives
Meta
Language
Spam Blocked
Batteries
13.01.2010
During the last year, there were many innovations that had crossed the path of the EVs. Almost all of the automobile companies started to develop electric vehicles or hybrids from EVs and gasoline engines. Many companies started the production of batteries for the EV industry in order to satisfy its need of energy sources. There’s no doubt that the lithium-ion polymer batteries are in first place. At the time being, according to my researches, this type of batteries is the most suitable to put into electric vehicles. And for now I’m totally dropping my first idea of putting lead batteries. There are two companies that deserve a special attention: www.thunder-sky.com and www.a123systems.com . Both of them are producing lithium-ion batteries, and naturally each one of these companies has its own developments and improvements that they had patented. You can even find an information that Tesla is using the A123 batteries, if you search the web. The advantage of the thunder-sky batteries is that they have big capacity on good price, but they lack the large current electricity, which is only 3C. A123systems on the other hand have less capacity for a certain price, but they have large current electricity – 30C. The conclusion is that the thunder-sky batteries are more suitable for family vehicles that don’t have any claims of having highly dynamic indications. On the website of a123systems we are informed of the new 20Ah Prismatic battery that’s on its way to the market. It has magnificent characteristics and it’s promising to bring a revolution in the EV’s world: 20Ah on 3.3 V, with max electricity of 600A and weight of 480 gr.
The mass production of this battery is expected to begin in June or July this year, and also at that time it’ll have a pretty good price.
For the moment, I stick to the idea of buying the batteries at the last minute, when everything else will be done. My observations show that any time now in this field there’s going to be a strongly dynamic boom, and if you rash with your choice and purchase, you may make a serious mistake.
Disassemble and measuring
In the past few days, I began to remove parts that I find “unneeded” for my car.
Then I tried to measure everything that I took off from the car, and that I had no intent of returning in it.
Here are the weights:
15 kg - exhaust system
1 kg - water reservoirs and tubes of the cooling system
6 kg – radiator with fan
9.5 kg – an empty tank
165 kg – a full equipped engine and gear box
Total: 196.5 kg
Soon I’m also going to take off the rear axle because I want to change it with one from VW synch. I’m also planning to put rear differential from Audi Quattro with differential lock. My idea is to make the car with entirly rear-wheel drive.
Expect pictures of their installation in the near future.
A new acquisition – parts for the controller
29.04.2009
I had lots of problems and I had to wait a long time, but finally the parts for the controller that I had ordered from China arrived!
I can now start my work on the controller. The source of the PMW signal will be PICAXE ; at least for now that’s my decision.The whole idea is to make two controllers. The first one will be 700 A and it will be mostly used for testing. It’ll be tested in a project for a civil electric vehicle. If the tests turn out successful, we’ll make the big controller (1400 A) for my project. Let’s just hope that soon I’ll be able to show you something that actually works. Recently I found out that I had problems with the gear box. Somehow I overlooked the fact that my motor was too big and my drive flanges would lean on the motor. For 4 mm less and it would have worked. I heard that the 084 gear box had a bigger shell than the 020 box. Any ideas?
New design of home site.
19.03.2009
The motor has been found!
27.02.2009
Quite unexpectedly, I’ve made myself a birthday present It’s the new model of an 11″ motor Kostov.
This is a more powerful motor than the one that I had in mind at the begging.
The motor that I wanted to use was a 22 KW at 144 V. And now I have a rated 35 KW at 168 V. I’ve heightened a bit my expectations….. The more, the better
I’d like to express my gratitude to Mr. Plamen Nakeff from ELPROM-EMS for his assistance during the purchase of the motor and special thanks also to TInko from the VW Club for his navigation!
Now I have to choose IGBT models for the controller. If there’s somebody who understands these kind devices, I’ll be very grateful if he contacts me! I’ve focused on the U series by Fuji: http://www.fujisemiconductor.com/html/table/91200/91227.htm
What’s new?
12.02.2009
There was some kind of standstill during the winter season.
To begin with, I’ve ordered 2 very interesting books from Amazon.com
I’ve posted some up-to-date pictures to stimulate you!
This is a Curtis 1221-7405 400 А controller on 120V… or at least it was All the Mosfet (BUZ 30A) transistors have burnt. I found it in Stamboliiski town in some junkyard. It’s quite impossible to fix it, but also it’s too small for my purposes. Apparently here we have an overloading process that lead to the current state of the transistors. If even one transistor should burn out, all others will follow the example. It’s interesting to know who it’s made. They used lots of electrical condensers in order to increase the area through which the electricity will flow, and that’s a foxy trick. There’s no problem with putting only one capacitor, but its pinouts won’t let enough electricity pass. The pinouts of the capacitor are put directly on the power armature and this blocks all the inductance. You can see a scheme of the controller here:
http://www.evdl.org/docs/curtis_1221b_schematic.pdf
ELPROM-EMS have released a new series of motors and I think I’ll get myself one of these very soon
Expect more news soon
The presentation of Tesla Roadster in Top Gear
16.12.2008
The presentation of Tesla Roadster in Top Gear
Something I read
13.10.2008
These days I read some books and I found out some interesting things.
Max HP = reted Hp x 4
Max torque = torque at rated PRM x 9
Max Current = full load amperage x 5
These formulas concern the engine.
MAx HP = reted Hp x 4 – the maximum power of one electric engine is equal to its nominal power multiplied by 4.
In another book I read something interesting about the tires. The pattern of the tire has a great importance. For example of a suitable tire the book suggests GoodYear Invicta GL.
http://www.goodyear.ca/catalog/products/INVGL.html
As you may notice, the tire has radial pattern and it has a very little space of contact. By choosing the right model of tires, you can increase incredibly the past distance with only one filling of the tank.
Tesla roadster
09.10.2008
Tesla roadster – for me this is the EV that will make its way into history. It’s like Tesla shouted to the world: “Look! Open your eyes!”. The batteries and the engine of Tesla produce 250 h.p. and a torgue of 380 Hm, further more the maximum torgue is available since 0 RPM. With just one charge of the accumulators you can travel for 350 km. Tesla starts and accelerates extremely quietly. And so, unconsciously, it reaches 14 000 RPM. The acceleration of 100 h.p. takes 3.9 sec, and the time of acceleration continues until the maximum speed of more than 200 km/h is reached. The whole idea of this car is to show the many advantages of this technology in regard to the already old conception of vehicles with internal combustion engine. It’s fast, powerful, economic and ecological! It’s something that none of the manufacturers can assemble in just one ordinary automobile. Here you can see some tables:
The basis of the EV
08.10.2008
Today we’ll have a bit of theory
. What are the basic elements of an electric vehicle (EV)? They are:
· batteries
· controller
· electric engine
If I have to compare the different parts of an EV and a normal petrol car, then the batteries of the EV should be the tank in the normal car. The energy is stored in the batteries and later it will be transformed in some kind of mechanical movement. The controller serves to command the electric engine. It determines the velocity of rotation of the electric motor. It has the same aim as the carburettor. It measures the fuel depending on the velocity we’d like to reach. In our case, the given fuel is the voltage of the batteries. The controller can perform other tasks just like the other controllers in the modern automobiles. The electric motor itself is simple If I have to be more specific, the electric motor has a moving part – a rotor and an immobile part – a stator. Just one electric motor has much less moving parts than an internal combustion engine. It has a bigger efficacy, but I’ll write about this in a separate post.
Monbat
Like I said in the introduction of this blog, I’ll try to use only Bulgarian parts for this project. I decided to use the semi-traction batteries of Monbat. The advantages and disadvantages of the various types of batteries will be discussed in different section. Now I’d like to present you the model of Monbat that I chose - “Megalight Power”. These batteries are produced according to the AMG technology. They have a small cycle of charge of the discharge (300), but they are light and they have great current electricity, which is a big plus for every sport EV.
ELPROM-EMS
I made a small research of the Bulgarian marked of EV and then I chose the electric motors of ELPROM-EMS. The most simple to control and at good price are also the electric engines with permanent electricity.
The model I chose has the following features:
· Working voltage 144V
· Nominal power 22 kw
· Nominal revolutions 4000 prm
This model was successfully used in many other projects like this one. Some of these projects can be seen on this website: www.evalbum.com
Jetta mk2 coupe - the car donor
I’ve chosen VW Jetta mk2 coupe to be donor for my project:
At the end the EV should look like this from the outside:
Why VW Jetta? It’s just that from many years one of my favourite sites is www.vwclub.bg/forum, so there’s no chance that I’ll be using any other car 
Yes… I also have VW Golf. Yes, it’s one of those old, square and beautiful cars 
