The category: Car

CAR PRESENTATION PART 10 OF 10: BRAKES

The Story about Solveig has come to an end. This blog post is about the brakes and it’s the tenth and final part in the Story. We hope that you’ve enjoyed it!

 

THE BRAKES

 

The braking system of this year’s solar car is made out of many customised parts. The brake calliper and master cylinders come from Shimano, and each calliper has two pistons. The brake pedal is entirely customised to combine two master cylinders into one foot pedal. The braking system will be significantly lighter than previous years and the performance will increase significantly.

 

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BATTERY GOING TO AUSTRALIA

Within a couple of weeks, on the 28th of June, we’ll ship the box with the battery from Sweden. Then it’ll travel at sea for 60 days to get to Australia! With this blog post we’d like to thank all the involved companies that have helped us with the shipping.

 

First, we’d like to thank Nefab for helping us packetizing our lithium-ion battery. The Nefab Group is a global industrial packaging manufacturer specializing in complete packaging solutions that reduce its customers’ total costs while minimizing environmental impact. Nefab is a leading provider of packaging solutions for the Telecom, Energy, Vehicle, Healthcare equipment and Aerospace industries. Since its inception in 1949, Nefab has grown from a local product-oriented company into a market-oriented company with a prominent position in the global packaging market. Thank you, Nefab, you’re great!

 

 

With this properly classified box, Patrick from DGM Sweden helps us with certification. You see, you can’t ship a battery just like that as the goods might be dangerous, so you need to have someone who can certify the box with the battery. DGM is the right company – thanks a lot for helping us with this!

 

 

Another company that has helped us with all this, is Handelskammaren Jönköpings Län. They have issued the ATA Carnet – the international Merchandise Passport – that is needed to ship the battery. Handelskammaren Jönköpings Län is one of eleven independent Chambers of Commerce in our country. The Swedish Chambers are private law Chambers (privately owned), based on voluntary membership. The regional focus of the Swedish Chambers separates them from other business organizations. By law the Swedish Chambers are authorized to issue documents and certificates needed for international trade. Internationally the Chamber of Commerce is a link in a chain of about 12 000 Chambers all over the world, forming a unique network of business contacts. Thanks for your help, Handelskammaren!

 

 

The forwarding agent of the battery is Key Logistics, which our Logistics Manager Hanna Steinum has had daily contact with. This company has been happy to be the forwarding agent of the battery and the box. Key Logistics is a medium sized privately owned logistic company. They are active in most markets around the world but have an extra focus on imports from the Far East. With the help of the developed skills of Key Logistics staff, they have refined the company to become a personal logistic agent that takes an overall approach of transportation needs. The range of their expertise gives the customers an invaluable sense of security in knowing that Key Logistics can always offer a competitive product no matter if it is: sea, air, road, courier or cargo. Thank you, Key Logistics, for being our partner!

 

 

As you now understand, there is A LOT of work with the shipping of the battery. We’re extremely happy that all of the companies mentioned above have helped us with this – you’re fantastic!

 

The photo below is a photo of Hanna and Erik. This is when they solder on the battery cell lines to make them suit our 3D-printed box. We’re many students who put many hours on this work – next week the battery must be finished and ready for departure!

 

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CARBON FIBER WORK

If you want to have a carbon fiber body, you have to work and make one! And that’s what we’re doing right now at Marström in Västervik.

 

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CAR PRESENTATION PART 9: ELECTRONICS

Part 9 in our Story about Solveig, comes here. It’s about the electronics – enjoy!

 

THE ELECTRONICS

 

We have been developing our own system to read the data from the motor controller, the battery and solar cells. The system is based on a STM32 processor that is used to log data from a CAN-bus that all the components are connected to.

 

With help from the data that is logged we can decide the driving strategy in real time. This gives us the possibility to read the power that is left in the battery so we can plan to give the last power when we are crossing the finish line.

 

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CAR PRESENTATION PART 8: MOTOR

The Story about Solveig is slowly coming to an end, but there are still a few parts left. This is the eighth part and it’s about the motor.

 

THE MOTOR

 

The motor for the JU Solar Team will be coming from Japan this year. We have it custom made from Nomura Co. and Mitsuba. The motor is very special because of its “sliding coil” rotor. Generally, a motor has one set speed where it performs at maximum efficiency. Since this rotor can slide, our motor has a wide range of speeds so that Solveig can travel at maximum efficiency.

 

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SPONSOR PRESENTATION: SWERUB

Even though it’s summer holiday, we keep on building the solar car. The suspensions have been upgraded with rubber components from Swerub. Their vibration absorber are perfect for our car and will give us a comfortable drive in Australia. This is what Swerub write about their business themselves:

 

“In heat pumps. On construction sites and oil rigs. In lawnmowers, chainsaws and laundry rooms. Our products are everywhere. We offer a wide range of vibration absorbers and other rubber components to seal and protect. At our two sites in Ekshärad and Sunne, we are fullt equipped to develop all kinds of components to suit your business requirements.If you can’t immediately find what you’re looking for, we can help. In fact, we love challenges and are expert at adapting to diverse needs. At Sunne, our close collaboration with neighboring rubber manufacturers means we have the resources of a really large rubber factory. With our expertise and experience, we deliver quality products all over the world. Welcome to Swerub!”

 

We think they are awesome – thanks for being our sponsor!

 

Car, Sponsors

CAR PRESENTATION PART 7: BATTERY

The seventh part in our story about Solveig is about the battery. Enjoy!

 

THE BATTERY

 

Compared to last year we are this year designing and building our own battery pack. This route is very challenging but it also gives us the possibility to get the most capacity. Elforest has been a major supporter with developing the best BMS (Battery Management System – including battery components) we have ever had.

 

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CAR PRESENTATION PART 6: DRIVER’S ENVIRONMENT

It’s already time to present the sixth part in the Story about Solveig. If you’ve missed any of the parts, scroll down to read them first, and if not, enjoy this part about the driver’s environment!

 

THE DRIVER’S ENVIRONMENT

 

The engineering behind the operator environment connects the driver with the car through the mechanical and electronic functions. We are aiming to make the driver and the car as one. This design considers three categories; comfort, design and the restrictions from the race. To create the best and the most comfortable driver’s environment is a very important job since the driving time can be up to 4 hours in a heat of 50 degrees. The design is racer inspired, the chair is made of carbon fibre from Tillett Racing Seats, the seatbelt is a four point seatbelt from Sparco and the steering wheel is customised and designed to fit the car, also made of carbon fibre.

 

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CAR PRESENTATION PART 5: THE BODY

We hope that you like our story about Solveig as much as we do. Here comes the fifth part which is about the body – enjoy!

 

THE BODY

 

To keep the weight of the car low we are making the body out of carbon fiber. This is done by the honeycomb material and the carbon fiber prepreg that creates a firm weight-optimized body. The body of the car is designed to be optimized for aerodynamics and to protect the car from weather.

 

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CAR PRESENTATION PART 4: SOLAR CELLS

The fourth part of the story of Solveig is here. This part is about the solar cells!

 

THE SOLAR CELLS

 

The JU Solar Team will be acquiring our solar cell array from the manufacturer SunPower and assembler Gochermann. Typical residential and commercial solar cells have about 14% efficiency, but our silicon-based photovoltaic cells have an ultrahigh 24.3% efficiency. These are the most efficient silicon cells available in the world today.

 

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CAR PRESENTATION PART 3: STEERING

We hope that you enjoy our story about Solveig. Here comes the third part!

 

THE STEERING

 

The steering is a mechanical construction to get a good driving impression and feeling. The steering is made out of standard components which also is easy to replace if anything would break. The construction of the steering is constructed and optimized to fit this kind of car to obtain the best weight. The components of the constructions contain both steel and aluminium.

 

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CAR PRESENTATION PART 2: SUSPENSION

Here’s the second part of our story about Solveig!

 

THE SUSPENSION

 

The suspension is constructed with high grade aluminum 7075, and is processed through water cutting and milling. The reason for choosing aluminum is due to the simpleness of working with the material but also due to the light weight. The suspension is irradiated by a swing arm construction similar to a motorcycle. The front suspension is constructed by two swing arms and one ball joint to be able to make sharp turns. The shocks are the best on the market from our supplier Öhlins and the suspensions have a lead of 10 degrees and an offset for a good handeling on the road.

 

The tires are custom made solar car racing tires with a low profile tire that can handle high air pressure, all to minimize the friction against the road. The rims are of lightweight construction, made of carbon fiber.

 

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CAR PRESENTATION PART 1: CHASSIS

Solveig is the solar car of 2017. We will in 10 blog posts present her and her parts – we start with the chassis, but first a short presentation about Solveig herself.

 

SOLVEIG – THE CAR OF 2017!

 

Our new car Solveig is a slimmer, lighter and faster version of her predecessor, Solbritt. Thanks to tremendous support from our sponsors we have had the resources to build a car that can aim for a top position in this year’s challenge. For this car we have chosen to build our chassis using optimized Docol steel, and according to our calculations it will be much lighter than our 2015 all carbon fiber car Solbritt. Because of rule changes, we will have a smaller solar array scaling down from 6m2 to 4m2, making our new high efficiency solar cells even more important. Our next generation battery cells have a 30% higher energy density than Solbritt’s generation. This together with our new sliding coil motor, world class suspension and a professional data management  system, we have every reason to believe that this year’s car will be something out of the ordinary.

 

For this year’s car, we are aiming at combining the speed of Magic with the stability of Solbritt to compete with the top teams in the race. The expansion of the team with a new management team has not only enabled our engineers to solely focus on building the best car possible, but also given them the resources needed to do so. In October 2017, it is time to once again participate in the Bridgestone World Solar Challenge with our new car Solveig!

 

 

THE CHASSIS

 

The chassis is constructed with high strength Docol steel from SSAB and is assembled with TIG-welding. The chassis is quite unique compared to Solbritt, the previous car, where the entire supporting construction was made with carbon fiber. This year the chassis is a separate construction from the carbon fiber body. Steel was chosen because of the flexibility and the ability to make multiple designs, with carbon fiber you only get one shot.

 

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PIZZA NIGHT

Tonight we ordered pizza for the team – we can’t work without food in our bellies, right?! And have you seen the big billboard next to the Munksjö bridge that JU has put up for us – very nice that so many people can see us on it!

 

Car, Getting together

TEST DRIVING SOLVEIG – PART TWO

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TEST DRIVING SOLVEIG – PART ONE

Yesterday we went to Axamo in Jönköping to test drive Solveig. The weather wasn’t perfect but the car sure did fly. And as you can see, Solveig is not complete yet, but she will be – enjoy these pictures while you wait!

 

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Testdriving at Axamo

I dag var vi på Axamo flygplats för att köra testchassit till vår solbil Solveig. Här har ni några bilder!

 

Today we went to Axamo airport to drive our test chassi for our solar car Solveig. Here are some photos!

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A little photobomb

We just wanna give you some photos!

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Testchassi

Testchassi under uppbyggnad! Och svetsning för fullt!

testchassi-1 testchassi-2 testchassi-3 testchassi-4 testchassi-5

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3D-scanning

Här är några bilder från när vi gjorde en 3D-skanning av potentiella förare!

 

Some photos from when we did a 3D-scanning, a digital copy of potential drivers!

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scanning

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