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. 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 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 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 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 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 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 Read more
What information belongs on a nameplate? Nameplate or rating plate is an inherent part of each drive system component, such as the transformer, variable frequency drive (VFD), electric motor etc. Therefore, it makes sense to spend few paragraphs on the Read more
SBB Re 460 (Lok-2000) Re 460 series is a modern four-axle multi-purpose electric locomotive operated by the Swiss Federal Railway (SBB CFF FFS) company in Switzerland. We can see these locomotives serving daily in the passenger trains. Manufacturers of these Read more
Electrifying Ride Through The Charming City of Baden This post informs about new highlight in Baden, Switzerland. The bus line 5 operated by RVBW switched from conventional diesel fuel buses to battery electric operation. How does the system look like? Read more