Nyhetsflöde

Dear Students,

 We hereby invite you to the following E2C seminars.

SEMINAR 3

Title: Design of auxiliary power supply for HV applications

Speaker: Post doc. Andrei Blinov, KTH Electrical Energy Conversion, Stockholm

Date and time: Wednesday 27 January, 13:00 - 15:00

Venue: Lecture room D35, Lindstedtsvägen 5

Abstract: Auxiliary power converter design, intended to be applied as a floating power supply with high voltage step-down ratio. The converter is non-isolated, unidirectional, based on a tapped-inductor buck topology. It is intended to function as a first stage auxiliary converter for high voltage HVDC and FACTS applications

SEMINAR 4

Title: EMC considerations for traction systems

Speaker: Dr. Mathias Enohnyaket, Bombardier Transportation, Västerås

Date and time: Wednesday 3 February, 13:00 - 15:00

Venue: Seminarierummet, Teknikringen 33

Abstract: There is a trend of increasing of switching frequencies and slew rates of power electronic switches used in drive systems. Recently, Silicon carbide switches (MOSFETs, IGBTs) with slew rates of over 20kV/μs are available. The high slew rates minimize turn-on/off losses, but inject high frequency harmonics into the drive system components. The injected harmonics could trigger parasitic resonances in the cables, motors, inductors as well as generating Electromagnetic (EM) emissions. Parasitic resonances seriously degrade drive system performance, and in some cases might lead to motor and system failures. To ensure robust drive system functionality, it is essential to characterize the parasitic resonances in cables, motors, inductors, through modeling and measurements. Once resonances are identified, drive system functionality could be improved by detuning using RF filters; harmonics elimination at lower frequencies; or carefully choosing the motors and switching frequencies, for example.

This seminar shall focus on the characterization of parasitic resonances of magnetic components through modeling and measurements. A high frequency model for predicting EM emissions from a simple drive system shall be presented.

Best regards

Daniel Johannesson

PhD Candidate

Dear students,

This is the official invitation to the first seminar in the autumn:

Monday 17th September, 10:15, Seminar room, Teknikringen 33

Title: Emetor - from idea to start-up company

Speaker: Dr Stephan Meier, Emetor AB

Summary: Emetor is an online software for the design and dimensioning of electric motors. In this seminar, you will follow Stephan Meier from first ideas about Emetor during his master thesis to a promising start-up company ten years later. On the way, you will get an insight in electrical machine design software as well as how to start and run a company.

Welcome!

Dear students,

The organization of the seminar series for the autumn is under way with Diane Sadik starting as the course administrator

The first seminar will take place on Monday the 17th of September at 10:15 in the seminar room, Teknikringen 33. A short presentation of the administrative rules for EJ2420 will also be given at this occasion.

A separate announcement of the seminar with more details will be posted later this week in KTH Social. The other seminars will also be announced via KTH Social so make sure you have adjusted your subscription settings to receive the information.

/Juliette