Active magnetic bearings (AMBs) are becoming very popular in high speed electrical machines applications in the last decade. As the interest in them grows the necessity to optimise all the aspects of their operation arises. This paper presents the analytical way of calculating losses of active magnetic bearings based on reluctance network method. The method… (More)
Inverter-induced high-frequency bearing currents are a common root cause of bearing failures in frequency converter-fed motors and generators. Bearing faults are typically identified by vibration measurements. In our work, we experimentally submit bearings to electric discharge machining (EDM) bearing currents, use different means to measure the electrical… (More)
Bearing faults may significantly reduce the useful life of electric machines. With the advent of modern fast-switching frequency converters, electric currents induced by the high-frequency common-mode voltage of these converters have been recognized as additional, sometimes severe, contributors to bearing degradation. The degradation is understood to… (More)
The effect of N-phenyl-2-naphthylamine, negative allelochemical isolated from the exudates of roots of pea (Pisum sativum L.), on the growth and activity of the adenylate cyclase signal system and virulence factors of the bacteria Rhizobium leguminosarum bv. viciae and Pseudomonas siringae pv. pisi was studied. It was demonstrated that… (More)
The possible role of transmembrane adenylate cyclase of a plant pathogen Pseudomonas siringae pv. pisi and of a symbiotroph Rhizobium leguminosarum bv. viceae in control of the activity of their virulence factors (cellulases and pectinases, the enzymes degrading plant cell walls) was investigated. While transmembrane adenylate cyclase was found to control… (More)
This work presents the compact radial-axial 3D PCB capacitive position sensor. The FEM model, numerical analysis and prototype verification are presented. The capacitances of circuit are estimated using 3D model and are verified based on spectral analysis. The open and closed-loop measurements prove feasibility in applications related to rotating machinery.