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 savings when utilizing a VFD in flow control. Energy savings 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 might be a bit misleading. We can also call it Read more…
Electro-mechanical interaction:Growing trend of vibration issues We have observed numerous vibration issues associated with rotordynamics in variable frequency drive systems across the industries. The trend is growing and this shall be a warning sign. There are multiple reasons for this trend. Here we name the most important ones from our Read more…
Electro-mechanical interaction:Introduction Electric variable frequency drives provide lot of benefits in terms of energy savings, controllability and flexibility. But the VFD is just means to control the speed or torque of electric motors. The useful work is provided by the driven load such as e.g. pump, fan, compressor or mill. Read more…
Topics you would like to read about in 2020 Happy and prosperous new year from MB Drive Services! We would like to thank all our readers for your interest, support, comments etc. The year 2019 was a true success. Our blog reached over 11’000 views from more than 2’800 readers. Read more…
Blast furnace plant Dolni Vitkovice In this series we look into industrial and utility plants that benefit or could benefit from the usage of medium voltage variable frequency drives. Today our excursion leads us to a former blast furnace plant Dolni Vitkovice in Ostrava, Czech Republic [1]. Previous Next The Read more…
Experience with IGCT based VFD Introduction This is a continuation of our Reliability and availability series. To access all posts in this series please click here. In today’s post we will share an industrial experience with medium voltage IGCT based VFD. IGCT as heart of high-power frequency converter is used Read more…
#LCI versus VSI:Part 4: Comparison (continue) Our series LCI versus VSI belongs to some of the most popular in this blog. We talk about the main medium voltage high power VFD technologies, Load-commutated Inverter (LCI) and Voltage Source Inverter (VSI), and compare them in various aspects. This post is a Read more…
VFD transformers and harmonics Introduction The next post in our series discusses VFD transformers and harmonics. We have already learned what harmonics are and how they impact the supply grid (Network harmonics – intro). In this series we look more specifically into harmonics and their impact on VFD transformer. Motivation Read more…
VFD transformers: Multi-winding design Today we look at the design of multi-winding VFD transformer feeding variable frequency drives. These VFD transformers are often classified in the category of ‘special transformers’. What does it mean? Why are they special? If you want to get these answers and a little insight into Read more…