Data acquisition unit for on-site diagnostics of air compressors

Based on the experience of Atmos Chrast company - a leading Czech manufacturer of the air compressors, there was initiated a development of specialized data acquisition unit for on-site diagnostics of the air compressors. The unit allows systematic and long-term monitoring of operating parameters of the compressors (temperatures, pressures, vibrations etc.). However, the device was not designed only to cover all types of the compressors produced by of this one anufacturer, but as basic platform for further development of complex diagnostics of rotating machines, including real-time analysis and data transfer for on-line monitoring. It can be used for testing of the brandnew machines in the factory testing room as well as for monitoring of the defective ones in the field. The designed device should help to increase effectiveness of the testing and prevent the machine failures. The paper describes hardware and software solution of the proposed data acquisition unit

Inductive coupling system for electric scooter wireless charging: electromagnetic design and thermal analysis

The paper deals with construction design and laboratory measurement of magnetic inductive coupling system suitable for electric scooter wireless chargers. It briefly elaborates design process relating to the system configuration, material used for construction and obtained operational conditions. The paper also discusses the thermal behavior of the couplers operating under load and describes fully automatic laboratory equipment for the system experimental testing

New planar light source for the induction and monitoring of photodynamic processes in vitro

We recently developed a new light source that allows for the continuous monitoring of light-induced changes using common spectrophotometric devices adapted for microplate analyses. This source was designed primarily to induce photodynamic processes in cell models. Modern light components, such as LED chips, were used to improve the irradiance homogeneity. In addition, this source forms a small hermetic chamber and thus allows for the regulation of the surrounding atmosphere, which plays a significant role in these light-dependent reactions. The efficacy of the new light source was proven via kinetic measurements of reactive oxygen species generated during the photodynamic reaction of chloroaluminium phthalocyanine disulfonate (ClAlPcS2) in three cell lines: human melanoma cells (G361), human breast adenocarcinoma cells (MCF7), and human fibroblasts (BJ)

Impact of COMPASS-U vacuum vessel and the first wall structures on signals of in-vessel magnetic diagnostic coils

The paper evaluates the impact of metallic structures of the COMPASS-U tokamak design on signals measured by in-vessel magnetic diagnostic coils. The eddy current shielding caused by the tokamak conductive structures of the vacuum vessel and plasma facing components is evaluated using finite element analysis performed by ANSYS Maxwell software. The simulation of the sudden shifts in the radial or vertical position of the plasma column returns 33–45% amplification of the tangential field component that from the most part would be analogous to a simple lumped circuit model approximation, despite the complex 3D shape of the nearby plasma facing com-ponents. The simulation of a rotating helical filament close to plasma edge (approximating a rotating magnetic island magnetohydrodynamic (MHD) structure) reveals an unexpected spatial modulation of the magnitude attenuation coefficient of up to 45% for the tangential field component across different positions relative to the PFC holders. Both results have led to the described conclusions for the sensor positioning design, specifically to the decision to install plasma position feedback sensors in between the robust holders of the PFC tiles, and the plasma MHD activity sensors strictly symmetrically with respect to these PFC structures

Design of current sensor for medium frequency operation

The paper proposes design procedure of several types of current sensors. The winding design is analyzed regarding its impact on operational characteristics and evaluated for preferred application. The paper also discusses the measurement results and given frequency characteristic and quality factors of the laboratory prototypes

Dynamic Inductive Coupling Based Wireless Rotor Monitoring System

The paper presents a new technology and design methodology of dynamic inductive coupling based wireless power transmission intended for the real-time measurement of rotor characteristics of electrical machines. The technology is based on dynamic inductive power transmission using three series-connected receivers on the secondary side. The paper summarizes the key system features and discusses optimization steps to maximize the device efficiency. The technical description includes the design of both coupling elements, and power electronics and explains power transmission and communication principles. The functionality of the proposed system is verified by developed device prototype embedded into 270kW permanent magnets synchronous generator

Intelligent high current sensor for various frequency

The paper proposes a design procedure of a current sensor. The winding design is analyzed regarding its impact on the operational characteristics and is evaluated for a preferred application. The paper also discusses the measurement results and given frequency characteristic and quality factors of the laboratory prototypes. The sensor is designed for a current up to 200 A and frequency up to 120 kHz. The sensor is equipped with an electronic unit in a common housing. The electronic transducer evaluated the measured data and produces the digital output signals which is easy to transfer even to a long distance

Distributed control system for medium-voltage STATCOM based on parallel connected power converters

Power semiconductor installations in mediumvoltage power grids are usually built by numerous particular power converter units containing large number of power modules. Such large installations place high demands on control systems including precise timing and signal distribution across the whole system. This paper deals with a proposed distributed modular control system designed for STATCOM installed in a MV power grid of 22 kV. The proposed control system is designed for a real-time control of the converter with high-speed interference-immune communication, reliable synchronization of numerous PWM outputs and synchronous immediate blocking of fire pulses for safe central stop in case of error handling

Antimony Hall sensor testing at ITER and DEMO relevant temperatures

Measurements of the steady-state magnetic field of ITER and DEMO reactors will be performed by Hall sensors that will be part of the magnetic diagnostics. The sensors will contribute to the measurement of the plasma current, plasma-wall clearance, and local perturbations of the magnetic flux surfaces near the wall. The paper describes new ceramic-metal Hall sensors with an antimony sensing layer. The results of temperature tests of second-generation antimony sensors based on thick printed copper technology are presented, including testing of the long-term stability of the sensors

Hodoscope with Timepix detectors for PilsenCube2 cubesat

The contribution describes the design of Timepix-based hodoscope for cubesat applications, such as Pilsen-Cube2, developed by the University of West Bohemia. The hodoscope is composed of two Timepix detectors with silicon thickness of 300 μm, placed in back-to-back arrangement and rotated relative to each other by 90◦, forming a telescope set-up. A copper separator is placed between two detectors to distinguish electrons and protons. The payload hardware and firmware are designed to support single detector operation as well as dual detector operation mode, in which particle coincidence detection is possible. The hodoscope electronic has been designed with respect to harsh radiation environment present in LEO (Low Earth Orbit). The device involves independent radiation hardened power supplies, including bias high voltage supply (up to 250 V) and auxiliary threshold reference DAC for each Timepix detector. Considering highly limited achievable data throughput between the CubeSat and the ground control station, advanced on-board data processing has been developed to reduce the size of transmitted data. The on-board data processing is provided by the radiation hardened SoC (System on Chip) Smartfusion2