Past seminars at IEA in 2019
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Fredag 15/2 kl 10:30, M:IEA, Presentation av examensarbete:
" Conservation Voltage Reduction i Sverige - en simuleringsstudie "
Kewin Erichsen och Stefan Viklund
Effektbrist är ett högaktuellt ämne som diskuteras flitigt både i dagstidningar och inom energibranschen. Conservation Voltage Reduction, CVR, är en teknik som studerats och använts i USA under många år som en metod att råda bot på bland annat just effektbrist. CVR innebär att sänka spänningen i eldistributionsnät med syfte att minska effektuttag bland elanvändare, utan att tumma på de krav som finns på spänningskvalitet. Kan CVR vara något för Sverige också? Genom modellering och simuleringar av ett system baserat på ett svensk distributionsnät har det här examensarbetet försökt besvara den frågan!
Handledare: Olof Samuelsson, IEA
Examinator: Jörgen Svensson, IEA
Fredag 8/2 kl 14:00, M:IEA, Presentation av examensarbete:
" The Dissipating Energy Flow method for analysing generator contribution to power system damping - Evaluation and interpretation "
Arbetet har utförts vid IEA i samarbete med Vattenfall AB
Handledare: Thomas Smed, Vattenfall AB, och Olof Samuelsson, IEA
Examinator: Jörgen Svensson, IEA
Torsdag 31/1 kl 10:30, M:IEA, Presentation av examensarbete.
" Virtual Leash - device-less remote parking based on ultrasonic sensor detection "
In today's car industry more and more focus is put on autonomous driving and driving assistance. There are functions being developed that are supposed to assist the driver as well as functions that will be fully autonomous. Parking is an area where car companies are developing a lot of functions related to driver assistance and autonomous driving. One of the main reasons for this is that a lot of people think it is difficult to park their cars. Therefore, functions related to parking assistance have a high customer value. And in order to make a good function related to parking assistance and autonomous parking the function must be easy to use.
In this thesis work we have made a proof of concept for an automatic parking function where you can control the movement of the car in parking situations without any remote device. Instead of controlling the car with a phone or a key, we want the car to recognize you as the user and allow you to lead it in and out of parking spaces, by having it following your movement.
Arbetet utfört vid Volvo Cars, Göteborg
Handledare: Nenad Lazic, Volvo Cars och Gunnar Lindstedt IEA
Examinator: Johan Björnstedt IEA
Friday January 25th, at 10:15, hall M:B (Mechanical Engineering building, Ole Römers väg 1, Lund)
Ph.D Defense and Presentation:
" On the Design of Electric Traction Machines:
Design and Analysis of an Interior Permanent Magnet Synchronous Machine for Heavy Commercial Vehicles "
Recent years have proven the benefits of electrifying the road bound vehicle fleet. With new components entering, the general understanding as well as the components as such needs to be improved. Focus in the thesis is on the design of an electric machine based on specifications of requirements for a commercial heavy vehicle such as a truck or a bus. One strict requirement is that the machine has to fit in the vehicle without compromising the performance. Besides limitations on the size, this affects the power density and hence efficiency and cooling. Another characteristic of a traction machine is the difference between peak operation and average or continuous loading. Within the automotive sector, cost is also an important factor.
Prior to the design work, pre-studies are used to acquire good understanding of the intended applications. The result is a space claim of Ø220 mm times 400 mm and a peak power of 180 kW. By designing the machine with a top speed of almost five times that of a conventional heavy duty engine, the required power levels are reached with less torque. As torque is proportional to size, the power demand is reached with a smaller and hence also less expensive machine. The design work is done in a two dimensional finite element environment partly developed at the division at Lund University. Main focus is on the limited space claim and requested peak power. Cooling is done with oil directed to the active parts of the machine. Prototype testing proves the machine to be capable of propelling a heavy commercial vehicle. Some in depth studies are also done on torque ripple in the skewed machine and on mapping of the losses.
The thesis presents the thorough work on setting the requirements, designing, prototyping and testing an interior permanent magnet machine intended for propulsion of heavy commercial vehicles. Improvements implemented in the design tool is verified with measurements.
A deeper study on the torque output from the skewed machine shows a load dependant influence with larger impact in the field weakening region. It is also found larger than expected from the analytical expression in relevant text books. The losses are mapped with main focus on the speed dependant parts. A review of how manufacturing processes and machine controls affect the iron losses is presented. The iron loss model is adapted based on test results. Losses in the windings and in the rotor are included in the study as well.
Prof. Mats Alaküla (Lund University)
Senior Research Associate Rafal Wrobel (Newcastle University)
Past seminars at IEA in previous years