Volvo FL Electric E-mobility is since a while not just a domain of electric cars. Manufacturers of buses and trucks also develop the electric variants of their vehicles and bring them to the market. Volvo Trucks [1, 2], the world Read more…
E-mobility Our blog is generally focusing on medium voltage drive systems. However, we can’t ignore the trend and the huge potential of electromobility (e-mobility). Since the technology is based on electric motors, variable frequency drives and other power electronics we Read more…
Protection of VFD transformers In the introduction to this series we have explained the differences between a distribution/power transformer and a VFD transformer [1]. Due to different design, construction and operation of VFD transformers the protection requirements shall be adapted Read more…
Motor start with VFD Our experience shows that the VFD motor start is sometimes not fully understood. This post shall explain how motor start with VFD works, what are the main benefits and how does it compare to a direct Read more…
Energy savings in pump systems: Case study 1 After introducing the way how energy and cost savings are calculated [1] we will demonstrate the theory on a real example from industrial practice. This article presents a case study of a Read more…
Case study on energy savings in variable flow fan systems.
Acoustic noise level This post discusses the topic of noise generated by variable frequency drive system. We will talk about acoustic noise in applications utilizing VFD technology. To be precise we shall use terms of sound pressure level and sound Read more…
Modern and historical public transportation in Pilsen Our excursion today leads us to Pilsen, Czech Republic. The city is located in western Bohemia. It was founded in 1295. The distance from Prague is about one hour. It is easily accessible Read more…
How to calculate energy and cost savings Our series on energy efficiency continues. The need for more energy efficient systems emerges day by day driven by increasing environmental concerns. Today’s post will guide you through calculation of energy and cost Read more…
Combined transformer Our recent post [1] walked the reader through the two main VFD transformer options: integrated transformer and external transformer. Today we will introduce a solution that aims to leverage on advantages of both solutions: combined transformer. The name Read more…