New hybrid reluctance motor drive
In this paper a new type of hybrid reluctance motor drive is presented. This new motor is characterized by a stator formed by the combination of independent magnetic structures composed of an electromagnet, the magnetic core with one or several coils wound on it, associated with a permanent magnet disposed between their poles. The rotor has the same configuration of a switched reluctance motor without coils, without magnets and without squirrel cages. A particular case of this hybrid reluctance motor is studied in which the stator consists of three electromagnets with permanent magnets, constituting each one of them one phase of the motor, and the rotor is formed by five salient poles. Then an analysis and simulation of the motor is carried out. Finally, experimental results and a comparison of this type of motor drive with respect switched reluctance motor drives of the same size are shown.
Organic bulk heterojunction solar cells suffer from a huge, nonmonotonic loss of open-circuit voltage ${V}_{o\phantom{\rule{0}{0ex}}c}$ at low temperatures, which thwarts their practical application. The authors incorporate energetic disorder into a drift-diffusion model to study the ${V}_{o\phantom{\rule{0}{0ex}}c}-T$ relations under various working conditions. In reproducing the empirical observations, they find that disorder-suppressed carrier mobility is the culprit. This work provides a comprehensive picture from the charge-dynamics perspective that will facilitate the engineering of this emerging class of devices.