Motor and inverter received
Last Updated on Saturday, 28 April 2012 00:21 Written by Mikkel Lauridsen Friday, 27 April 2012 23:46
While still working on finishing the last parts for the Viking V racecar, the long awaited motor and inverter has finally arrived.
The Sevcon Gen4 motor inverter is the control unit that distributes the power to electric motor.
The Sevcon AC controller lives up to the high performance and requirements of a modern racecar and with the low weight of only 10 kg. and a compact design it fits perfect within the Viking V.
The power to the wheels is delivered by the YASA-750 electric motor manufactured by YASA Motors Ltd.
With focus on direct drive, high torque and racing the design of the motor is exactly what the SDU-Vikings wants in the next generation of the Viking racecar.
With the very low weight of only 25 kg and with the ability to deliver 750 Nm at peak torque and 400 Nm continuous to the wheels, the motor is absolute perfect for the Viking V.
The direct drive concept for the Viking V, stated in the beginning of the design phase, is very much going to be implemented with the YASA-750 motor.
The motor has a peak power output of a 100 kW, but will be electronically limited to 85 kW according to the rules from the Formula SAE.
Torsional Stiffness Test
Last Updated on Saturday, 28 April 2012 00:19 Written by Mikkel Lauridsen Tuesday, 17 April 2012 09:59
During the Easter Holidays a test was carried out on the Viking IV racecar to determine the actual torsional stiffness compared to the computer simulation.
The Test confirmed an increase of torsinal stiffness from the Viking III to the Viking IV.
When the Viking V is completed the torsinal stiffness is expected to exceed that of both Viking III & IV in spite of a significant weight reduction of the chassis.
It will also be determined to what extent the battery pack will act as a stiffening element in the chassis
Dashboard development for Viking V
Last Updated on Tuesday, 07 February 2012 12:43 Written by Mikkel Lauridsen Tuesday, 07 February 2012 11:51
By Lasse Burstynowitz and Kent Hansen
The assignment for the dashboard team is to design the new dashboard for the Viking V based on the experience from the previous dashboard. The Viking IV had a problem with a flashing display, which is the main problem to find a solution for.
The preliminary analysis lead to a need for a parallel interface to the display controller as a serial interface will not be sufficient to avoid the flashing problem.
With regard to this limitation different displays and controllers was examined. The study lead to two different solutions for the new dashboard.
The first solution is based on a wide-screen display as showed on figure 1 while the second solution is based on a 4:3 display as showed on figure 2.
The shape is an advantage for solution 1, if the display is placed behind the steering wheel. It is harder to avoid shades from the steering wheel by using the display from solution 2.
On the other hand, solution 2 provides more graphical possibilities with a full color display compared to the first solution with a monochrome display. It does only offer 16 levels of yellow.
However, both dashboard solutions are supported by the same parallel interface, which makes it possible to postpone the final choice of display.
Therefore it was decided to go for the cheapest solution and get it to run. Then it should be simple to adapt the written software to the other display if necessary.
For now, we have purchased the display for solution 1 and a proper connection board. The next step will be to get it running and make the first tests to see, if we eliminated the flashing problem of the old display.
SDU-Vikings is going to Germany this summer
Last Updated on Tuesday, 17 January 2012 23:36 Written by Mikkel Lauridsen Tuesday, 17 January 2012 13:09
SDU-Vikings is going to participate in the Formula Student Germany event this summer and is running in the Electric class.
The Team qualified to the event, which is from the 31th of July to the 5th of August on the famous Hockenheim race track. For more info please go to: www.formulastudent.de
The qualification was made by answering correct to 15 questions. The first 32 electric teams with all questions correct, are given a spot in the competition and we are one of them. This year we are running with the car number: E31.
To see which other teams The SDU-Vikings are competing against please go to the following website: www.formulastudent.de/fse/2012/registered-teams/
Now we just have to finish the car
Logo from formulastudent.de
Update From The Battery Pack Team
Last Updated on Tuesday, 17 January 2012 13:34 Written by Mikkel Lauridsen Monday, 16 January 2012 00:03
Finding the right batteries is a very difficult task and it necessitates a lot of compromises during the process. In the mean time the concept for the battery pack has been worked out and is almost ready to adapt to the dimensions of the final batteries.
The battery pack consists basically of two parts; an inner part positioning all the batteries in small slots, and an outer shell securing the batteries against getting wet.
There are 24 slots in the inner cells and in total we estimate to use 6 of these cells giving us an amount of 288 batteries in total. The total amount of batteries can still be changed because we don’t know the exact batteries yet.
It has been decided to find out if it is possible to 3D print these inner cells. The advantages of 3D printing is that the design is very flexible according to change the dimensions for the batteries. Another advantage is that we are able to make an easy and simple way of assembling all the inner cells to each other.
The outer shell primarily has to protect the batteries against water. We can’t make it 100% sealed because we still need to circulate air for cooling the batteries. The idea is therefore to make an “overlapping system”, which allows air to circulate and still prevent water getting in.
Still need some changes!
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