This section collects topics related to energy efficiency and energy savings in variable speed drive systems. Here we present articles with fundamental theory, posts about best practice, share case studies and so on. Scroll down and discover what is available.
Why is it important to keep reasonable switching losses? Switching frequency is a decisive design parameter of a VFD – especially in medium voltage drives where the semiconductor capability may be more restricted. But switching losses have much bigger impact on the system. The end user shall understand it properly Read more…
Why do larger drives achieve better efficiency? How does the efficiency of a drive system scale with the power? And why do larger drives achieve better efficiency? That is the subject of this blog post. What is efficiency Efficiency is the ratio between output power and input power, typically expressed Read more…
What is behind the recooling of electric rooms? VFDs generate certain heat load that is dissipated into the ambient. Despite the high efficiency of the VFD, there is some portion of losses that heats up the electric room where the equipment is installed. Hence, it is important to ensure proper Read more…
Cut your energy bill before it is too late! Electricity prices reach all time high in Europe and many industrial producers are under huge pressure. There is at least one thing that everyone can make, independent on the local government, EU commission etc: Reduce your energy consumption. In fact, you Read more…
How to measure VFD efficiency Energy efficiency is high on the agenda. VFDs are enablers on higher efficiency in drive systems, especially in flow control. However, how to deal with VFD efficiency? In particular, how to measure VFD efficiency and verify the figures provided by the manufacturer? There is a Read more…
VFD efficiency over 100%: A discovery of a perpetuum mobile? April 1, 2022 Variable frequency drives (VFD) help to save energy on a system level. Also on component level the VFD has very high efficiency. But could the VFD efficiency exceed 100%?? As today is April 1, the Fool Days, Read more…
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 something to offer for less dynamic applications as well. In Read more…
It is time to evaluate the energy and cost saving potential of VFD! We all read and hear it in the news daily now: The electricity and gas prices are going up sharply. Some people even talk about “energy crisis”. This phenomenon affects the households as well as industrial customers. 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 frequency drive (VFD). The analysis will be performed specifically for Read more…
Inverter current higher than input current (New Year’s Eve issue) Can inverter current to the motor be higher than the rectifier input current?That is a question that puzzles some people. Let’s have a closer look in our year-end post inverter current higher than input current. The recent advancements in VFD Read more…