How does DTC contribute to superior energy efficiency? Direct Torque Control (DTC) is well-known for its superior dynamic performance. Therefore, it is successfully used in applications requiring rapid change of torque in the range of few milliseconds. However, DTC has Read more
75 MVA converter duty transformer After publishing several theoretical articles on VFD duty transformers it is time to have a closer look at some real designs. In today’s post we present a brilliant example: 75 MVA converter duty transformer designed Read more
Solidarity with Ukraine Ukraine, a sovereign European country, has been attacked and invaded by the army of Russian Federation. Something we could hardly imagine in civilized Europe of 21st century. Our blog has been fully dedicated to topics related to Read more
How does VFD calculate the motor torque? Motor torque along with speed is the most important quantity that the VFD shall control. But how does the VFD measure or calculate the motor torque? What are the necessary inputs? Are there Read more
How to choose a medium voltage VFD:Service network and reaction time From end user’s perspective the uptime of the plant is crucial. The cost of loss of production quickly exceeds the equipment cost of the VFD. Therefore, you need a Read more
IGBT versus IGCT power semiconductors – A brief comparison Semiconductor is the heart of any power electronic equipment. In medium voltage range of variable frequency drives two types of power semiconductors emerged: Insulated Gate Bipolar Transistor (IGBT) and Integrated Gate-Commutated Read more
Top 5 manufacturers of converter transformers Lists with top x products / brands / holiday destinations / restaurants / hotels etc are extremely popular. Today we would like to present a list of top 5 manufacturers of converter transformers. As Read more
Keep It Simple Stupid (KISS) Keep it simple stupid, in short KISS, is a popular expression used in various areas. The approach aims to keep every step in a process as simple as possible. KISS is sometimes even used as Read more
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