Wyniki 1-4 spośród 4 dla zapytania: authorDesc:"Jan VALOUCH"

Electromagnetic susceptibility of IP camera DOI:10.15199/48.2016.05.40

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Electromagnetic susceptibility is an important ability of all electronic and electric devices which are located in the area with electromagnetic interference. The paper is focused on IP camera and it describes its levels of electromagnetic susceptibility against electromagnetic interference. The measurement must be performed according to standard EN 50130-4 ed. 2. Streszczenie. Podatność elektromagnetyczna jest ważnym parametrem określającym odporność urządzenia na zakłócenia elektromagnetyczne. W pracy badano kamerę IP w oparciu o normę EN 50130-4 ed. 2. Podatność elektromagnetyczna kamery IP Keywords: Electromagnetic susceptibility, IP camera, semi-anechoic chamber, electromagnetic interference. Słowa kluczowe: podatność elektromagnetyczna, kamera IP Introduction Electromagnetic susceptibility is based on the physical phenomenon called electromagnetic radiation, and it consists of an electric and a magnetic component. Vectors of electric and magnetic field are mutually orthogonal and have the same phase. Electromagnetic radiation can originate in two ways, which are following:  accelerating motion of charged particles - radiation with a less frequency and energy, but the wavelength is longer (radio wave).  the changes in the internal structure of the particles - the radiation has a greater energy and frequency, but the wavelength is less (X-ray radiation, etc.). Electromagnetic radiation is generated by all electrical and electronic devices. Radiation energy is transmitted in parts, and it is directly proportional to the frequency. The amount of particles (photons) depends on the intensity of radiation. Electromagnetic susceptibility (EMS) is defined as the ability of equipment or system to operate without a fault or with strictly defined permissible influence in an electromagnetic environment. The aim of electromagnetic susceptibility is to increase the electromagnetic immunity of receivers (devices that are[...]

Stopping of transport vehicles using the power electromagnetic pulses DOI:10.15199/48.2015.08.25

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Abstract. Operation of electrical and electronic systems can be disturbed by the influence of natural or artificially generated electromagnetic pulses (EMP). In this connection for many years people successfully developed means for generating the power EMP also in the form of weapon systems. Potential targets can be the important elements of critical infrastructure, military systems or transport vehicles, for example if necessary stopping the moving vehicle, as well as vehicles, which penetrated to vicinity of the protected object or stopping of vehicles at control posts. Streszczenie. Praca systemów elektrycznych I elektronicznych może być zakłócana przez generowane impulsy elektromagnetyczne. Takie impulsy mogą też służyć jako broń przeciw systemom militarnym w tym także pojazdom. Możliwości zatrzymania ruchu pojazdu za pomocą impulsów elektromagnetycznych Keywords: Electromagnetic Pulse, Direct Energy Weapons, High Power Microwave, Non-Lethal Weapons. Słowa kluczowe: broń elektromagnetyczna, impulsy elektromagnetyczne Introduction The development of automotive technology is coupled with the increase of electronic components, which are sources of electromagnetic interference (EMI) and also in terms of electromagnetic susceptibility (EMS) their activities may be disrupted by electromagnetic interference from the surrounding sources. The measurement of EMI and testing of EMS are performed for automobiles and their electronic components and subsystems in accordance with European Directive 2006/28/EC and set of standards ISO 11451 (Road vehicles - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy) and ISO 11452 (Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy). Within the automotive technology is also required follow the set of standards ISO 7637 (Road vehicles - Electrical disturbances from conduction and coupling) and [...]

Electromagnetic susceptibility of wireless relay against surge DOI:10.15199/48.2016.05.41

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The examination of electromagnetic susceptibility of electronic devices is an important part of the process of design, development and construction of the electronic device. Surge is one of the types of electromagnetic interference and all the electronic devices must be tested on this type of interference according to international standards. Surge often occurs at the atmospheric disturbances such as lightning or at disorders in the energy of the high voltage network. The surge can cause failure of devices or even its permanent damage or destruction, in case the electronic device has insufficient electromagnetic immunity. Streszczenie. Udary często powodowane są prze wyładowania elektryczne i zakłócenia w sieci elektrycznej. Mogą one powodować zakłócenia pracy przekaźników a nawet ich uszkodzenie. W pracy przedstawiono badania wpływu udarów na pracę bezprzewodowych przekaźników. Kompatybilność elektromagnetyczna przekaźników bezprzewodowych Keywords: Electronic systems, Electromagnetic susceptibility, Immunity, Surge. Słowa kluczowe: kompatybilność elektromagnetyczna, udary, przekażniki bezprzewodowe Introduction Electromagnetic compatibility is a multidisciplinary department, which includes in its theoretical foundations of whole electrical engineering. Development of the electronics, especially a microprocessor technology, radically changed not only the concept and methods of use of electronic devices, but also demands for their installation and location. The processes of electronic devices such as the transmission of information, automatic processing of information and data recording are exposed to disturbing influences originating from multiple sources of interference. The disturbing influence of environment is manifest by undesirable bonds, interfering background noise, the resonance and transient phenomena. This can induce not only malfunction of electronic devices, but also a distortion or depreciation the transmission of in[...]

Brushless DC Motor Control on Arduino Platform DOI:10.15199/48.2018.11.24

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In many industrial applications such as blowers, vacuum pumps, and centrifugal compressors, a high-speed brushless DC (BLDC) motor has become a major area of interest due to its high power density, small size, and low weight. It became popular even in the applications with the Unmanned Aerial Vehicle. The Author [2] said that for a high-speed BLDC motor, a simple and robust motor drive system with high energy efficiency and excellent operating performance is required. In a traditional BLDC motor drive, six discrete rotor position signals are needed and detected through three hall sensors. According to the author [4] the BLDC motor provides many advantages such as less consumption, small volume, good stability, larger torque and simple control. That is the reason why BLDC motors are mainly used in the UAV. These motors can be divided into two types. First one is the out-runner. This type of motor has lower spinning speed, but it has far more torque. The typical speed for the out-runners is twice smaller than for in-runners. It means that in-runners usually using the gearbox for increasing the torque. The UAV need torque more speed, and the gearbox adds to the model more weight which is undesirable for all UAV. These are the reasons why UAV using out-runners instead of in-runners. These differences are also visible. The out-runner has the rotor as the casing of the whole motor. It means that the frame is moving and it is also more dangerous to the for nearby obstacles. The rotor of the out-runner motor is composed of the powerful magnet, and the stator is composed of three windings which are shifted from each other by 120 degrees. These motors need a driver to control the switching polarity of the internal winding. The driver has the power part and control part. Power part consists of the power voltage and transistors that can control the current flow through the windings. As mentioned in [3] Three-phase switching signals b[...]

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