Abstract: Electric motor, in particular induction motor, comprising a stator, a rotor and a control device which is arranged at the rotor. The three rotor windings are connected to a Rotor Control device with inverter and controller unit mounted on the rotor. A capacitor is placed in the DC link. The capacitor is supplied from the EMF induced in the rotor. The current in the rotor windings is advanced in order to achieve a 90 degree phase shift between rotor current and stator MMF vector. To achieve this the frequency and amplitude of the rotor current as well as the phase shift can be varied. Wherein the frequency of the rotor inverter is matching the slip frequency.

Abstract: Electric motor, in particular induction motor, comprising a stator, a rotor and a control device which is arranged at the rotor. The three rotor windings are connected to a Rotor Control device with inverter and controller unit mounted on the rotor. A capacitor is placed in the DC link. The capacitor is supplied from the EMF induced in the rotor. The current in the rotor windings is advanced in order to achieve a 90 degree phase shift between rotor current and stator MMF vector. To achieve this the frequency and amplitude of the rotor current as well as the phase shift can be varied. Wherein the frequency of the rotor inverter is matching the slip frequency.

Abstract: An electric machine that includes a stator and a rotor, wherein the rotor is adapted to rotate relatively to the stator, and wherein the rotor comprises a rotor-switching-device which is arranged at the rotor.

Abstract: An apparatus for utilizing radiation is disclosed. The apparatus may comprise a collector unit, a transfer unit and a working unit. The collector unit comprises at least one radiation reflecting surface adapted to focus radiation and to direct said radiation to said transfer unit. The transfer unit may comprise at least one transparent section, which is integrated into a wall of a first working fluid reservoir of said working unit. The first working fluid reservoir may comprise working fluid, wherein said transfer unit is arranged such as to directly transmit radiation to said working fluid to heat said working fluid.

Abstract: The invention relates to an electric power generator (10), comprising: an internal combustion engine (20) having a piston (22), a linear electric generator (40) for generating an electric current, comprising a linearly movable part (42) which is connected with the piston (22), and a stationary part (44), and an energy storing device (50) for storing the energy which is generated by the linear electric generator (40) by moving the linearly movable part (42) relative to the stationary part (44) during the work cycle of the piston (22), the energy storing device (50) being adapted for applying at least a part of the stored energy to the linear electric generator (40) such that the piston (22) is movable back towards the upper dead center thereof during the exhaust-refresh cycle of the piston (22), as well as a motor assembly equipped therewith.