Abstract: In a system and method for operating a system having a rectifier which is supplyable from an electric AC-voltage supply network, an inverter which feeds an electric motor, and a DC/DC converter which is connected to an energy accumulator, the DC-voltage side connection of the inverter is connected to the DC-voltage side connection of the rectifier, in particular, the electric motor is supplied from the AC-voltage side connection of the inverter, a first DC-voltage side connection of the DC/DC converter is connected to the DC-voltage side connection of the rectifier, in particular, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter are connected in parallel, the DC/DC converter has a housing in which a device for current acquisition is situated, which acquires either the current, in particular network phase currents, flowing into the rectifier at the AC-voltage side connection of the rectifier, or the current emerging from the rectifier at the DC-volt

Abstract: In a system and method for operating a system, which includes a first inverter which feeds a first electric motor, and a second inverter which feeds a second electric motor, the DC-voltage side connection of the first inverter is connected to the DC-voltage side connection of a rectifier which is supplied from an electrical AC-voltage supply network, the DC-voltage side connection of the second inverter is connected to the DC-voltage side connection of the rectifier, in particular, the two DC-voltage side connections of the inverters are switched in parallel, and a controller is provided, in particular in the first inverter, which controls the current accepted and acquired by the first inverter at its DC-voltage side terminal toward a setpoint value in that the torque of the first electric motor fed by the first inverter is the controlled variable.

Abstract: A drive system with energy store and method for operating a drive system, an inverter powering an electric motor, the inverter being supplied from a unipolar DC-link voltage, an energy store being connected in parallel to the inverter, in particular, a film capacitor being connected in parallel to the inverter, the DC-link voltage being generated by a DC/DC converter which is supplied from an AC/DC converter, especially a rectifier, in particular, an electric current being able to be supplied to the DC link by the DC/DC converter.

Abstract: A cooling system for a geared motor, and a geared motor having electric motors and a gear unit as well as an adapter which is disposed between the electric motors and the gear unit, the electric motors having ducts for a coolant, in particular, a coolant, especially a cooling liquid, being able to flow through each of the motors which, in particular, are liquid-cooled, the streams of coolant emerging from the ducts being brought together and being fed at least proportionally by a first distributor to the gear unit in order to lubricate and cool the toothing parts of the gear unit.

Abstract: An energy production system with energy store and method for operating an energy production system, solar cells, particularly a module including solar cells, being connected to an inverter, especially at its DC-side terminal, the inverter being connected at its terminal on the alternating-voltage side to a power consumer and/or an AC system, a DC/DC converter being connected, especially with its first DC-side terminal, in parallel to the solar cells, particularly to the module including solar cells, the DC/DC converter being connected to an energy store, particularly which is connected to the second DC-side terminal of the DC/DC converter.

Abstract: A drive system with energy store and method for operating a drive system, an inverter powering an electric motor, the inverter being supplied from a unipolar DC-link voltage, an energy store being connected in parallel to the inverter, in particular, a film capacitor being connected in parallel to the inverter, the DC-link voltage being generated by a DC/DC converter which is supplied from an AC/DC converter, especially a rectifier, in particular, an electric current being able to be supplied to the DC link by the DC/DC converter.

Abstract: A drive system and method for operating a drive system, including an electromotor, inverter, energy store, the electromotor being able to be supplied from the inverter, which is supplyable from the energy store, a current able to be controlled by a switch being supplyable to at least one stator winding of the electromotor, which is supplied from an electrical energy source that differs from the energy store.

Abstract: A cooling system for a geared motor, and a geared motor having electric motors and a gear unit as well as an adapter which is disposed between the electric motors and the gear unit, the electric motors having ducts for a coolant, in particular, a coolant, especially a cooling liquid, being able to flow through each of the motors which, in particular, are liquid-cooled, the streams of coolant emerging from the ducts being brought together and being fed at least proportionally by a first distributor to the gear unit in order to lubricate and cool the toothing parts of the gear unit.

Abstract: In a separately excited electrical synchronous machine, and a method for operating a synchronous machine, coil windings, in particular in the form of excitation coils, are disposed on the rotor, the electrical supply of the coil windings being achieved with the aid of an inductive rotation transmitter, whose secondary winding is connected to the rotor and whose primary winding, which is inductively coupled to the secondary winding, is stationary, especially connected to the stator of the synchronous machine.

Abstract: A drive system and method for operating a drive system, including an electromotor, inverter, energy store, the electromotor being able to be supplied from the inverter, which is supplyable from the energy store, a current able to be controlled by a switch being supplyable to at least one stator winding of the electromotor, which is supplied from an electrical energy source that differs from the energy store.