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  • Post
    Demonstrator av flöde i en tre-fas motor/ Demonstrator of flow in a three-phase motor
    (2023) Amer, Malek; Mohamed, Abshir; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering; Lundberg, Stefan; Sistek, Sakib
    Abstract This degree project was carried out at school in the spring of 2023. The purpose of this project was to create a demonstrator in the form of an application that would show how the magnetic field moves in a rotating induction motor. This project idea is not too popular in the market, thus there is much room for potential development in this field. Even though the field movement in an electric motor has been studied carefully, it can be difficult to illustrate what it actually looks like in operation in real-time. That’s where this solution comes into the picture. The project can be a tool for developing the educational aspect of this specific subject. It also makes it generally easier to study an electric machine and its characteristics. The project use hall effect sensors as they measure magnetic field. They were connected to an Arduino that handles the measurements and then sends them via Bluetooth to the application. The application was programmed in Android Studio using the Java language. How the field would be illustrated in the application was a decision process that changed during the work. This was because it took more time than anticipated, which changed what could be implemented. The magnetic field generated by the windings is presented as a circle at each winding that changes in size based on the value of the field. Each sensor will lie on a different winding to measure the change in the field. The circles are used because they can clearly show increased positive field by expanding and decreased negative field by decreasing. Since the field rotates in the motor, the positive and negative parts will also rotate, and this will show different sizes of field at different time points. The goal was to show it in a way that was easiest to understand with the existing time. The work resulted in a well-functioning application with small delays. The application can improve its performance but also with more features. Most time in the work was spent on getting the values from the Arduino to the application and separating the string that the values are in when they are sent over.
  • Post
    Analys av växelriktare
    (2023) Söreke, Simon; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering; Hammarström, Thomas
    Sammanfattning I detta projekt undersöks en växelriktare, komplett med spänningsomvandling, för att evaluera dess prestanda, effektivitet och funktion. Växelriktarens kretskort och komponenter studeras och kartläggs för att beskriva hur enheten är uppbyggd och fungerar. Genom att ta fram modeller för varje del av enheten blir det möjligt att beräkna vilka laster varje funktionskritisk komponent klarar av. Från denna analys presenteras slutsatser om vilka begränsningar och eventuella förbättringsmöjligheter som finns för enheten. Arbetet utgör en del av ett större projekt där en prototyp för ett småskaligt vindkraftverk ska tillverkas. För att kunna utföra tester på vindkraftverkets prestanda behöver energin konverteras till 230V växelspänning, vilket görs genom en växelriktare. Syftet med arbetet är att undersöka växelriktaren som är ämnad för bruk i denna prototyp, vilket specificerar vilka typer av laster som kan nyttjas vid drift,samt vilka energiförluster som uppstår. Detta med målsättningen att vindkraftverkets verkliga prestanda kan beräknas. Genom att ta fram enhetens uppbyggnad på komponentnivå kan även eventuella modifikationer göras på dess design för att optimera växelriktaren för detta syfte. Resultatet av undersökningen på konstruktionen visar på en design där en justering av temperaturbegränsningar enkelt kan öka enhetens märkeffekt med bibehållen funktion, utan att ha en negativ påverkan på enhetens effektivitet. Enhetens effektivitet, som ökar i korrelation med effektuttaget, är relativt låg. En ökning av växelfrekvensen i enhetens spänningsomvandlare kan potentiellt bidra till en ökning i både märkeffekt och effektivitet.
  • Post
    Enabling Cobots to Automatically Identify and Grasp Household Objects
    (2023) Vallin, Gustav; Adler, Maja; Nilsson, Markus; Ståhlbom, Oskar; Losman, Saga; Lee, Samuel; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering; Dean, Emmanuel
  • Post
    Tracking an Object as a Vehicle Using Real-Time Data from a Fixed LIDAR Tower and Dual GPS Sensors
    (2023) Bui, Daniel; Almoghrabi, Mustafa; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering; Thomas, Bertilq; Fagrell, Henrik
    Abstract Autonomous vehicles are used in various fields. They are typically positioned using GPS, but in many cases, GPS does not provide precise and accurate results,especially in proximity to obstacles such as walls or large metal containers in port environments.To overcome this, methods are needed to position a vehicle using real-time data from LIDAR and GPS. The purpose of this thesis is to analyze methods for positioning a vehicle using real-time data from LIDAR and GPS. There is relative freedom in choosing which method we will use. In this study, a unique and new approach is implemented by using a Fixed LIDAR Tower in addition to a single GPS sensor installed in a vehicle. The collected data on the vehicle’s precise location is transmitted to the Control Room at the Shipping Port for further analysis and monitoring. Using the Extended Kalman Filter to combine data from multiple sensors, a new way to track and locate a vehicle is suggested and tested in a simulated environment. Different algorithms are compared and analyzed, mainly emphasizing the main emphasis being on effectiveness, computing efficiency, and applicability. The objective is to build a robust framework for a vehicle tracking system, improve autonomous navigation, and lay the groundwork for later testing and real-world application.
  • Post
    Video technology in ambulance care - Implementation, needs and possible solutions
    (2023) Alvaeus Tynnerstål, Ebba; Börjesson Rintala, Sofia; Fassih, Anna; Johansson, Alexandra; Sandoff, Elina; Thedin Olsson, Tove; Chalmers tekniska högskola / Institutionen för elektroteknik; Chalmers University of Technology / Department of Electrical Engineering; Candefjord, Stefan