What is the relationship between VFD input and output current? Introduction Variable frequency drive (VFD) is often seen as a black box. This black box converts fix voltage and frequency supplied from the grid into variable voltage and variable frequency Read more…
Different types of drive redundancy and their use cases Redundancy in medium voltage (MV) drives is a critical design consideration aimed at enhancing the reliability and availability of motor-driven systems. Drives with some types of redundancy are used in applications Read more…
On-demand webinars: Final sale (last 24 hours) MB Drive Services is providing webinars on drive related topics since more than 3 years. Initially, those webinars were live through zoom. Since May 2024 we have been using the WebinarJam platform to Read more…
Multi-motor drives and their coupling Multi-motor drives in this context represent applications where multiple motors work together to drive specific load system. Unlike individual drives, there is certain coupling between the motors. Hard and soft coupling The motors can be Read more…
Why torsional vibration in variable speed drive systems deserves an attention? Introduction I am an electrical engineer, same as probably most of the readers of our blog. The electro-mechanical interaction within the drive system is therefore not so easy to Read more…
Neutral point treatment of a converter transformer A common question of system integrators or end users is about the neutral point treatment of a converter transformer. Can or shall the neutral point be earthed? What are the consequences for the Read more…
VFD protection reaction Reliable protection is key for long term successful operation of a variable frequency drive (VFD). There is a wide range of situations outside of the normal operation to what the drive system shall respond. In this blog Read more…
VFD Soft Starters – Methods of Synchronous Transfer Abstract Purpose of a VFD soft starter is to start and accelerate the motor up to the nominal speed. The final step is to synchronize the machine with the grid and transfer Read more…
Most common medium voltage VFD topologies in comparison Abstract Medium voltage drives consist of several topologies. While some of them are seldom found in industrial applications, others are very popular and create integral part of the portfolio of most global Read more…
What is the definition of short-circuit impedance? Short-circuit impedance, also called impedance voltage, is an important design parameter of a transformer [1]. Thus, it is crucial to understand this parameter. In this brief post we introduce three ways of definition Read more…