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Permanent magnets are used in many sorts of devices. They are applied in many electromagnetic transducers - like, for example, electric machines and measurement instruments. Nowadays a new generation of sensors, especially position sensors, are fitted with permanent magnets. Different types of sensors and different working environments require the application of permanent magnets with parameters adapted to working conditions, such as, among other things, the temperature of operation. This paper presents a review of permanent magnets, their magnetic properties and their properties in different temperatures.


In the paper the use of Rogowski coil manufactured in multilayer PCB technology for the measurement of emissions of harmonic currents into the mains has been described. The method of evaluating the frequency characteristic of the coil up to several MHz has been presented. The current measurement resolution has been discussed taking into account the thermal noise of the coil and the equivalent input noise of the modern coil signal amplifier. The algorithms of coil signal processing have been evaluated.


This paper presents the requirements for electromagnetic compatibility EMC emission and immunity for the power protection units. The most important standards and recommendations for designing electronic devices for industrial automation have been presented. © 2014, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.


This paper presents the requirements for electromagnetic compatibility EMC emission and immunity for the power protection units. The most important standards and recommendations for designing electronic devices for industrial automation have been presented.


Slusarek B.,Instytut Tele I Radiotechniczny
Przeglad Elektrotechniczny | Year: 2010

Development of new soft and hard magnetic materials is one of the main factors decisive for the development of today's electric machines. Magnetic materials prepared by powder metallurgy technology find more and more application in electric machines and other electromagnetic transducers. Magnetic parts are manufactured from different types of powder and by different methods of powder metallurgy technology. The paper reviews soft and hard magnetic powders, technology of production of magnetic parts and their physical properties.

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