Asynchronous and synchronous motor drives in comparison Medium voltage variable frequency drive (MV VFD) systems mostly utilize two types of electric motors: asynchronous and synchronous machine. This article compares some of the characteristics of both technologies. Aspects such as power and speed range, efficiency, system dimensioning, control and instrumentation and 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
Does a VFD pay off? In turbulent times companies are cautious of making investments. However, exact these periods are times when specific companies set apart from the others by making smart decisions. VFD can reduce the energy consumption, make the production more flexible and improve the quality of the products Read more
Energy saving assessment for a drive system Variable frequency drives (VFD) often allow considerable energy savings for the end user. We have previously shared case studies on variable speed fans [1] and variable speed pumps [2]. Resulting payback time can be 2 to 3 years. Despite this known advantage of Read more
Energy savings in pump systems: Case study 1 After introducing the way how energy and cost savings are calculated [1] we will demonstrate the theory on a real example from industrial practice. This article presents a case study of a boiler feedwater pump inside a thermal power plant. Let’s explore Read more
Case study on energy savings in variable flow fan systems.
How to calculate energy and cost savings Our series on energy efficiency continues. The need for more energy efficient systems emerges day by day driven by increasing environmental concerns. Today’s post will guide you through calculation of energy and cost savings when utilizing a VFD in flow control. Energy savings Read more
Input power factor and reactive power consumption The focus in all energy efficiency initiatives is to minimize the losses, improve the system efficiency and reduce overall power consumption. With “power” people usually refer to active power and this is basically correct. Main purpose of VFD is to reduce active power. Read more
#Energy efficiency Part 1: Introduction Energy efficiency is a big topic that the society talks about. One reason is the increased awareness of the impact of human on the planet and effort to minimize this impact, other reason is purely economical considering cost benefits due to energy savings and competitive Read more