Best VFD topology: One size fit all? If you deal with variable frequency drives (VFD) you have certainly asked yourself the question: What is the best VFD topology? Why do the big brands have several different products in their portfolio? Read more
One reason for torsional vibration issue:Torque ripple In this post we look at torque ripple, its background, character and impact on the shaft string. After reading through you will have a brief idea what the torque ripple is and how Read more
5 reasons why I love VFD Valentine’s Day is coming. We would like to take this opportunity and confess our love to variable frequency drives (VFD). Welcome to the article “5 reasons why I love VFD”. Don’t get me wrong. Read more
Will 2021 be the Year of E-mobility? Do you think that year 2021 will be the year of e-mobility? What are the drivers of e-mobility? What news can we expect to happen in e-mobility sector within this year? Or is Read more
VFD output transformer Our VFD transformer series already guided you through many topics of VFD input transformers from their purpose, through multi-winding design and other design aspects, such as short circuit impedance or harmonics, up to protection or testing. However, Read more
Harmonic calculation versus network harmonic study As our regular reader you already have a solid knowledge about network harmonics caused by non-linear power electronic systems. It does not surprise you that network might have resonance(s) – a topic that needs Read more
Active harmonic mitigation with AFE drives In this article we will once again touch the topic of grid side harmonics, particularly focusing on active harmonic mitigation with AFE drives. Abbreviations used: AFE = Active Front End APF = Active Power Read more
Energy saving study: Special promotion (limited) Take an advantage of our limited offer and get a free-of-charge support for an energy saving study. Together we will assess the energy and cost saving potential resulting from the use of a variable Read more
Tap changer: Yes or No? Shall a VFD transformer be equipped with a tap changer? What are the pros and cons of a tap changer on converter duty transformer? What kind of tap changer shall be used? How many taps Read more
Prague metro EN: Prague metro / CZ: Pražské metro We invite you on a short excursion of Prague metro – discover with us the backbone of the transportation system of the city of Prague. Efficient public transportation system is a Read more