By Stefan Fassbinder / Published on Wed, 2009-08-19 08:08
An electric motor and an electricity generator are basically the same. By principle, any electric motor can also generate electricity. Electric drives are way ahead of combustion engines, since, unfortunately, a car engine which sucks up exhaust fumes during braking and downhill rides and converts them into fuel and fresh air is still pending. The electric motor can deliver this, although during its first century of existence, its use has largely been hampered by two basic drawbacks:
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By Hans De Keulenaer / Published on Mon, 2008-09-22 10:00
The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC ) problem — the electromagnetic coupling applied in the field of power electrical systems as. The simulation analyses and practical measurements of the electromagnetic coupling are presented in part II . Obtained results confirm the correctness of the theoretical analyses and so they can be used for predictive stating of EMC quality of individual new electrotechnical products.
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By Hans De Keulenaer / Published on Tue, 2008-05-06 14:33
Problems on inverter motor drives such as bearing currents are introduced due to common mode voltages. Different solutions are proposed on literature, for two-level or multilevel inverter. Instantaneous zero common mode voltage by using a three-level inverted could be achieved. This paper proposes a commutation strategy that allows zero common mode voltage by using medium vectors, and also a new representation as a plane on the commutation space is defined which is called zero common mode voltage plane. On this defined plane, every turning vector fulfil this property.
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High Efficiency Motor Systems
By Sergio Ferreira / Published on Tue, 2008-03-25 07:50
High efficiency motor systems can save 202 TWh of electricity use per year for industry in Europe. This information center provides tools and guidance to realise this potential.
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By Hans De Keulenaer / Published on Thu, 2008-02-28 15:32
By Dragomir Vasic
In this reader article, Dragomir Vasic introduces a basic technique of frequency regulation for preparing the fuel-air mixture in hot water boilers used for district heating. This simple and relatively low-cost measure saves 25,000 euro per year, with a payback of just 0.6 years.
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By Hans De Keulenaer / Published on Wed, 2008-02-13 18:03
By S Kalaschnikow et al
In industrial low and medium voltage mains, passive filters and PFC capacitors have traditionally been used to improve the supply quality. However, they cannot be rated only for the loads being compensated. They are affected by harmonic currents from other non-linear loads or by harmonics from the power system [1]. Compared with passive element compensators, an active harmonic compensator (AHC) can be used to improve the supply quality without worrying about all the problems associated with applying passive elements.
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By Hans De Keulenaer / Published on Fri, 2007-11-30 11:00
In this new highly interactive seminar format, the content will depend on your contribution. No long presentations will be made, but each participant is invited to share a few stories, and a few slides on personal experiences with energy-efficient drives in the field.
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By Hans De Keulenaer / Published on Tue, 2007-10-23 12:43
By M Szweda et al
This paper deals with problems of electric power quality evaluation in ship’s network. The measurements of voltage waveform distortion have been carried out on an all electric ship – a research vessel equipped with electric propulsion comprising AC active front end (AFE) drives. The exemplary results of experimental research have been shown and compared with current requirements of Standards and Rules concerning power quality in ships’ networks.
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By Hans De Keulenaer / Published on Wed, 2007-07-25 15:00
A number of economic case studies on the application of energy efficiency measures in an industrial environment:
- variable speed drive for water pump
- variable speed drive on combustion air fan
- energy savings in compressed air systems
- steam valve insulation
- condenser set point in cold storage room
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