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
How to measure VFD efficiency Energy efficiency is high on the agenda. VFDs are enablers on higher efficiency in drive systems, especially in flow control. However, how to deal with VFD efficiency? In particular, how to measure VFD efficiency and Read more
VFD efficiency over 100%: A discovery of a perpetuum mobile? April 1, 2022 Variable frequency drives (VFD) help to save energy on a system level. Also on component level the VFD has very high efficiency. But could the VFD efficiency Read more
Electric buses in Brugg: Powered by the sun! Brugg region is another location in Switzerland that starts utilizing electric buses. We have recently reported about the line 5 in Baden which is a great success so far. Postauto in Brugg Read more