06 - July Newsletter EN

July 2021 - Vol VI Green LETTER

table of contents News 1 NewsGP21 is on its Way! In this month, we continue building GP21 2 team leader’s remarks from where we left off! During this process, it is essential to transmit knowledge to the Vítor Teixeira younger members of the team who, due to confinements and exams, are yet to use 3 Siemens Innovation the CNC machine, the mill, the lathe and The New Controller make composite parts. Even practicing the assembly and maintenance of our cars has 5 sponsors been difficult, due to the prioritization of Copitec; JLCPCB other tasks alongside personnel limitations at the workshop (Covid Restrictions). 6 #TeammatesJoão Barros; Paulo Silva; Frederico Martins 7 Photo of the month We also highlight the preparation and tests carried out during the month for Photoshoot GP19 to ensure a good performance in the competition in Navarre, in which we will 9 Greenpower Track List participate in October. Silverstone 1

Team Leader’s Remarks “after a long and intensive finals season, we’re back to the workshop in full force” Vítor Teixeira In the next month we’ll be focusing on mentoring the newest members of the team who, un- fortunately, haven’t had many opportunities to work on the cars and dominate the most prac- tical part of the project. This was also a very intensive month for the Electronics Dept., given all the tests they per- formed on the newly revolutionized electronic and electromechanical systems of GP19, that serves as a test bench for the new ECU of GP21. More specifically, the new Power Delivery and Management System, and the Data Acquisition, Analysis and Feedback System have been progressively improved throughout the course of this season and are becoming exponentially more efficient than any other system we implemented in the past. In terms of 3D-Printing, we’re also letting the new members experiment with the pro- cess, as the older members develop our own 3D-Printer of 420x420x500mm3! Why so big? Because we can! And we can manufacture 3D-printed moulds, therefore having another alternative to CNC-Machining. 2

Siemens Innov the New controller PSEM’s next vehicle will have a new controller developed entirely by our Electronics Department. More efficient and functional than the one used so far, this component has revolutionary features, which will allow GP21 to achieve great results. For this, we are relying on a microprocessor (ATmega328) to carry out the voltage control’s logic, which allows us to program the PWM output signal with great ease and fine-tune parameters such as the signal frequency. Furthermore, as the connection of the potentiometer that controls the speed will go through the microprocessor first (and not directly through the MOSFETs), there’s the possibility of 3 doing some pre-processing of the signal, which is

vation very convenient considering the behaviour of the motor’s start. As the current required by the motor increases sharply with voltage variations, starting the car at the beginning of the race involves a high consumption of the batteries’ energy. Thus, it was up to the pilot to do a very gradual dosing of the acceleration, which will now become a task performed by the microprocessor. We were also able to solve an optimization problem that gives us the input 4 to provide to the controller, thus maximizing the distance covered over the course of an hour, with the start-up being the crucial moment of this optimization. Currently, we are testing the second version of this new controller, carrying out extensive high-power tests.

Sponsors Copitec is a stationery and print center JLCPCB was founded in 2006 and has specialized in printing, binding and been at the forefront of the PCB industry, stamping services adapted to the different specializing in the rapid production of needs of its customers. It is situated in high-reliability and cost-effective PCBs. Alameda, near Instituto Superior Técnico. It stands out for supporting several student PSEM started to count with Copitec’s groups around the world and PSEM is no unconditional support at the beggining exception. of the present season, for the printing of various advertising materials, such as The company is responsible for supplying newsletters and posters. PCBs for GP21, that is, printed circuit boards where electrical components are soldered, We appreciate its cooperation and interest thus ensuring the proper functioning of in collaborating with our project. the prototype’s electronics. 5

Jõao Barros #teammates Paulo Silva I am 20 years old and studying Mechanical Engineering. In my free time, I practice Brazilian Jiu-jitsu. Frederico Martins I joined the Mechanical Design Department in the 2019/20 season and I am currently working on the development of new shafts and rear hubs. The main skills I acquired were the ability to quickly develop more efficient components and perform FEM simulations in programs such as SolidEdge and NX. In the future, I hope to work on the development of innovative technologies and win with GP21. I am from Casal de Cambra, I am 20 years old and I have now completed my 3rd year at LEGI. In my spare time I enjoy reading and watching TV shows. I have been a part of the Communication and Marketing Department since 19/20 and have had as main tasks managing social media and contacting possible sponsors. During my path I acquired skills in teamwork, time management and also learned how to work with some image editing software. In the future, I hope that the team has the chance to compete again and that I can follow GP21’s construction. I am 21 years old, and I study Mechanical Engineering. I really enjoy playing bass and cycling. I joined the Mechanical Design Department in the 19/20 season and I am currently developing GP21’s shafts and hubs. The greatest skills I acquired were CAD and being able to do structural analysis and optimization. I’m thrilled to be starting GP21’s construction and I hope it reflects all the hard work and dedication put into it in the races. 6

Photo of the m 7

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Greenpower Track Silverstone Circuit, located in Northamptonshire, England, is one of the most famous tracks in the world since it is stage for the F1 and MotoGP British Grand Prix. Like many english tracks, Silverstone is also a former RAF airbase, having only been transformed 9

k List: silVerstone into a racetrack in 1948. It has a length of 5,9km and, in addition to being one of motorsport’s headquarters in the world, it hosts one Greenpower Challenge’s stage every year. 10

Thank you for your support! 11

Follow PSEM’s Adventures on: @psem.ist @psem_portugal company/psem @Psem_Portugal [email protected] (+351) 218 419 561 Vítor Teixeira Bruno Vitorino Team Leader Technical Director (+351) 913 548 111 (+351) 935 820 953 Leonor Barata Leader of the Comms & Marketing Dept. (+351) 968 275 408 12