Abstract-Switched-mode power supplies in variable-frequency drives often combine good electrical efficiency with generous production of conducted emission. The common-mode (CM) current through the output-to-motor cable may perturb nearby systems via cable-to-cable crosstalk. Parameters relevant for the coupling are the rise-fall times and amplitude of the output current and voltage, and types and lengths of the cables. Of the many techniques to reduce the crosstalk, we investigated a particular one: reduction of the CM current by the armor of the motor cable. The armor is intended for mechanical protection, but may also substantially reduce the crosstalk. In an actual installation, we measured the transient current through the three phase leads of a motor cable. The cable length was 85 m, and it was buried in wet soil for most of its length. We also measured the transfer impedance of the armor up to 10 MHz, and used this to calculate the overall CM current in a coupled cable model using assumed reasonable values for the cable and soil parameters. Measurements and model results agreed well on the amplitude of the dominant resonance at about 300 kHz. The ratio of the inside transients to CM current was a factor of 20.
A multistatic FMCW RADAR system with 2 transmit and 2 receive antennas is to be used to avoid collisions of autonomous guided vehicles used in the Rotterdam harbour. It turns out that in this application data interrogation is 'cheaper' than data association.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.