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The operation of a synchronous generator connected to a dc load by a six-pulse diode bridge is analyzed in this paper. The dc load has in parallel a high electrolytic capacitor to reduce the ripple in the dc voltage: the dc voltage is regulated acting on the field current of the generator. Such a layout is currently used to create a stable and reliable dc-bus for stand-alone dc systems as in electro-diesel...
This paper analyses the thermal behaviour of a tooth coil permanent magnet synchronous machine. The thermal network is obtained by interconnecting particular circuit elements: they derive from the specific analytical solution of the thermal field in proper subsystems of the electrical machine. This implies the computation of the axial temperature mean value of the nodes; then, it is possible to compute...
Some converter configurations for wind energy systems are proposed. The conversion structures include capacitor loaded diode bridges directly feeding a grid side inverter. Because of the great variation of the PM generator voltage, due to the wide speed range, a winding commutation is adopted between parallel and series connection, at low speeds. Various features are analyzed, concerning converter...
The phenomenon of the unbalanced magnetic pull is analytically modelled, referring to cylindrical rotor A.C. machines. Even if under some simplifications (sinusoidal space distribution of the current density, no slotting, no saturation, no parallel paths), various compact and significant expressions of field and force are obtained, for any number of pole pairs: the model is based on a critical re-formulation...
In the electrical measurement practice, the measurements of the quantities related to the safety and preventive maintenance of the electrical distribution system are very important. Due to the potential risk caused by wrong measurements, it is necessary to assess the status of the employed measurement system at all times, and assure the measurement traceability too. This means to calibrate the instrument...
In the electrical measurement practice, the measurements of the quantities related to the safety and preventive maintenance of the electrical distribution system are very important. Due to the potential risk caused by wrong measurements, it is necessary to assess the status of the employed measurement system at all times, and assure the measurement traceability too. This means to calibrate the instrument...
Some design and operation aspects of PM synchronous machines, employing armature windings with concentrated coils wound around the stator teeth, are presented; the e.m.f. control is based on the variation of the windings flux linkage, obtained by modifying the stator (or rotor) configuration. Thanks to the high number of poles and the excellent waveform quality, even with deep field weakening, these...
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