Telemetry confirmed good news.

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We went to the speed track, in Cartagena, where we could use the track for some time. We thank you very much for their help.

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We decided to drive a non-stopping run at a constant current, to see how other aspects of the prototype (our electric Twingo), as range, temperatures, rpms..etc. . were affected.

 

Due to the amount of corners the track had, we couldn’t get a stable current consumption, but at least we could monitor it, and that was the result for 20 min drive.

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We can see an average of 120 Amp out of the battery pack most of the time. And also, around 210 Amp out of the controller.

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All this time we have consume around 3,3 Kw, which is a stoning 46% of the total capacity.

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But, ¿how this test affected to the rest of the components?. Well, we could see the controller a bit too hot, so that led us to think about an additional cool system for the controller. We saw a peak of 72ºC, which is the limit of a healthy temperature, so we are working in some system to dissipate faster the temperature of the heat sink controller.

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The motor also was a bit warm, but we could see a very healthy average between 40ºC and 50ºC, so no drama about it, for now.

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We can also see that we tried to get the motor at the stable revolution rate of 2500 rpm, which is the manufacturer  recommended rpm rate to get the maximum torque. Seeing that we did drive a maximum rpm efficiency it is also good news. So, Telemetry came ok at Cartagena´s speed track.

 

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So, a little video with a summary of the whole test can be enjoyed here. If you need a professional video recording work for your project, please contact:  Tecnoforma, victor.aldaya@tecforma.com

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Testing, testing, .. out road.

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60_testingThe conversion of a petrol or diesel vehicle is the most sustainable and economical way of driving a perfect electric car. The main idea behind this, is to re-use all the vehicle´s components that have no impact in the internal combustion engine, and to substitute it with a full electric motor. Engine, radiator, petrol tank, exhaust tubes, alternator, etc will be removed, reducing the car´s weight. By having a chassis with all the necessary parts for driving, as interior, brakes, tyres, shock absorbers, etc, all effort is reduced to install and design an electric system with a motor and batteries.

61_testingIt is very important to choose a good design for the electric system, electric motor, battery pack and motor controller should have the same specifications in power and speed to the ones the car when it was originally designed. Too much power could damage the traction components or may not respond as well to breaking, and too little could cause the gears no to acquire the adequate speed.

Elektrun is a project that was born two years ago to probe the concept of transforming a city car to electric, ideal for short trips within the city.  We have chosen a Renault Twingo to build a prototype,  it is a vehicle with little weight and a reduced size, and after two years of design, test and experiments we have made it work.

62_testingThe main issue for this kind of transformation is the range the batteries will achieve. Now days there are cars that can drive 700kms in one single charge, in order to achieve that, it needs at least between 70Kw and 80Kw. Our prototype comes with a 7,4Kw.

 

 

63_testingThis prototype has an 15KW AC induction motor with a maximum torque of 80Nm, a battery pack of 72V and 100Ah, it has an 80V and 350Amp controller. This can speed the car to 90km/h in 5th gear.

The first tests shown the total weight didn’t affect at all in corners, the shock absorbers responded well as expected, and by removing the engine noise the driving was much more comfortable.

64_testingAn additional vacuum pump was installed to help the braking system. The braking was also performing very well as, it responded to hard braking and kept the car stopped in steep ramps.

 

65_testingA small display was installed in the interior to monitor, at any time, battery usage, current, motor temperature, state of charge, etc.

 

66_testingLights and interior accessories as electric windows, radio, air flow, window cleaner, etc were kept in the car.

This car takes 8 hours to fully charge the battery pack, although there are chargers that could reduce this time from 6 to 4 hours.

 

 

You can see a video about the first tests here: