InterCity-Express (ICE) – The German high-speed champion In this blog post we look at another high-speed champion on European railway tracks: the InterCity-Express, well known as ICE. These trains are the highest category trains in the fare system of Deutsche Read more…
Protection of VFD-fed motors How to properly protect an inverter-duty variable-speed electric motor? What protection is covered by the VFD? What shall be done externally? Which protection elements are most suitable? The article on protection of VFD-fed motors brings the Read more…
Short circuit currents appearing in variable speed drive systems The knowledge of short circuit current level in variable speed drive systems is crucial for the design of system components as well as for the system protection. Inadequate dimensioning, unsuitable protection Read more…
What is the difference between VFD and VDS? This article aims to answer one relatively simple question: What is the difference between VFD and VSD? As the question was raised again recently, we would like to deliver an understandable explanation. Read more…
Lunch & Learn (& Help) Lunch & Learn is a popular concept of short trainings and seminars held during or around lunch breaks. In a bit informal way you learn about particular topics. It is one topic per session, served Read more…
FIT rate of power semiconductors: What are the main factors? FIT rate (FIT = Failure In Time) is a common indicator to express the reliability of a semiconductor. And, as we know, reliability and availability is crucial for almost any Read more…
What does the X/R ratio tell us? In one of our previous posts we have talked about “purely inductive grid”. That is certainly a special case of oversimplification. Keeping it still very simple we may use “resistive-inductive grid”. The relationship Read more…
Opportunity for talented Ukrainian student or trainee Ukraine needs our support. And the possibilities are almost endless. Starting from expressions of solidarity, material or financial help, accomodation of refugees up to long term investment and aid to rebuild the country. Read more…
Types of IGCT devices IGCT (Integrated Gate-Commutated Thyristor) is a popular power semiconductor device used in medium and high voltage power electronic applications. The switch has outstanding capabilities as explained in [1] and [2]. In this post we will introduce Read more…
Challenges of high-speed machine design In turbomachinery applications the conventional solution is a 4-pole machine with nominal speed in the range 1’500 – 2’000 rpm and a speed-increasing gear. However, the alternative is a gearless high-speed drive. Such concept may Read more…