320 research outputs found
Perspectives on Electric Machines with Cryogenic Cooling
No full textCryogenic cooling is a well-established and expanding technology. In the field of electric machines, it allows the construction of more efficient machines with a high power density. This paper addresses the main cooling technologies and their impact on cryogenic machine construction, providing perspective for their use in future electrical machines. Although cost and safety issues of cryogenic systems are still holding back the uptake of cryogenic electric motors and generators, research in this field should provide significant improvements and promote their use at different levels
Axially-laminated VR motors: mathematical models and experimental inve-stigations on prototypes
No full textThermal Design of Linear Generators for Wave Energy Converters
No full textGenerators for wave energy converters are enclosed
within sealed containers. The thermal exchange mechanism is
based both on natural convection occurring in the air within
the container and in the water outside it. Conduction occurs in
all other domains. To assess the maximum allowable electrical
loading a numerical approach based on thermal simulation and
Computational Fluid Dynamics (CFD) is developed via Finite
Elements. A comparison is made among a deep sea device and
a floating one. Concrete and steel are evaluated as container
materials. The objective of the analysis are the admissible current
density, the loss density and the heat transfer coefficient
Triggerless DAQ system for a light based detector
No full textThe utilization of various types of photon detectors, generally referred to as light based detectors, is widespread in many fields of high energy physics, nuclear physics, astrophysics and medical imaging to measure scintillation photons or Cherenkov light. Both the traditional photomultiplier tubes (PMTs), still the most commonly used, and the silicon photomultipliers (SiPMs) in rapid development in the last years show good performance. The sensitivity down to single photoelectron (PE), the wide dynamic range and the fast timing characteristics can be exploited thanks to a careful optimization of the readout electronics, trigger and DAQ.
In applications where a high efficiency is required at low energy threshold (as for rare-event search experiments), in a typical trigger-based DAQ architecture, lowering the number of coincident signals for the event selection is mandatory with the consequent heavy increase of data rate that could not be sustained by the DAQ chain.
We have developed a triggerless data collection scheme for a light based detector that relies on a new generation of waveform digitizer board, developed by CAEN and able to manage an independent data acquisition on each channel. This paper describes the implementation and the performance of the triggerless DAQ system
Experimental evaluation of comparative performances of some fractional-horsepower AC motors
No full text
Experimental evaluation of comparative performances of some fractional-horsepower AC motors
No full text- …
