VFD switching frequency The heart of every variable frequency drive (VFD) is the power semiconductor. By switching on and off in a proper modulation scheme the frequency conversion functionality is achieved. Let’s look at various aspects of VFD switching frequency. Switching frequency of medium voltage VFDs Having medium voltage VFD Read more…
Torque-Speed characteristic of induction machine This post aims to explain the famous torque-speed characteristics of asynchronous (induction) motor. We try to make it simple and understandable. First we thought to put without mathematics into the title. Well, we might write 2-3 formulas, but keep it as simple as possible. Promised! Read more…
VFD software functionality In continuation of our series to guide users how to choose a medium voltage VFD this post talks about VFD software functionality. We live in a digital age and there is no doubt that software is very powerful. Don’t worry, we don’t gonna talk about Industry 4.0 Read more…
Enclosure protection – IEC vs NEMA In this short post we look into the subject of ingress protection (IP) of enclosures used in variable frequency drives, switchgears etc. First we explain the classification of ingress protection according to IEC standard (“European practice”). Afterwards we introduce the North American practice defined Read more…
How to understand IEEE 519-2014? IEEE 519 is one of the worldwide most common standards related to harmonics and power quality. Yet, the standard is not always correctly interpreted and sometimes even misused. In this article we bring up few points that will help us how to understand IEEE 519. Read more…
Supervising critical transports with Mobitron Cargolog impact recorder Medium voltage system drive key components, such as the VFDs, transformers and motors, are sensitive, expensive and critical equipment. It is therefore of utmost importance to pay attention not just during manufacturing and factory testing, but also during transportation to site. The Read more…
Happy and prosperous new year 2022! Dear customers, partners, friends and supporters, In the name of MB Drive Services I would like to wish all of you a happy, healthy and prosperous new year. May you be able to fulfill your goals in professional as well as private life. May Read more…