Abstract:
The invention relates to drive system and to a method for operating the drive system, comprising an electric motor, inverter, energy accumulator, wherein the electric motor can be fed from the inverter, which can be supplied from the energy accumulator. At least one stator winding of the electric motor can be supplied with a current which can be controlled by a switch and is supplied from an electric energy source that is different from the energy accumulator.
Abstract:
The invention relates to an arrangement comprising an energy store, wherein the energy store is arranged in a housing, wherein the housing is arranged sunk into the ground, and thus in particular is at least partially surrounded by soil, sand, gravel, stones and/or water.
Abstract:
The invention relates to a geared motor comprising electric motors, gears and an adapter which is disposed between the electric motors and the gears; the gears comprising an input shaft and an output shaft; each motor having a rotor shaft; the adapter having an adapter flange which forms a housing; the adapter flange at least partially surrounding a summarizing gear in such a manner as to form a housing, in particular for causing the power flows generated by the motors to converge at the gear input shaft; a cooling medium, in particular coolant, being able to flow through each of the motors, which are in particular liquid-cooled; the motors having an outlet for the cooling medium; there being formed on the adapter flange ducts which cause the cooling medium emerging at each motor outlet to converge at an outlet, in particular at a single common outlet on the adapter flange.
Abstract:
The invention relates to an arrangement for cooling electrical components that generate heat, in particular capacitors, wherein an accommodating part has openings, in which the components can be accommodated, wherein the components are mounted on a circuit board, wherein air channels are arranged in the accommodating part, and air channels lead from the side of the accommodating part facing away from the circuit board to the side of the circuit board facing away from the accommodating part.
Abstract:
The invention relates to a drive in which the power from the electric motors is guided to a summarising gear. An output shaft of the drive or an input shaft of a gearbox is driven by means of an output shaft of the summarising gear. The gearbox comprises an output shaft which is connected to a shaft of a load which is to be driven. The power from the summarising gear can be guided to an energy accumulator or the power from the energy accumulator can be withdrawn therefrom and can be guided to the summarising gear.
Abstract:
The invention relates to a cooling arrangement for a geared motor and a geared motor, comprising electric motors, gears and an adapter disposed between the electric motors and the gears. The electric motors have ducts for a cooling medium, in particular each of the motors can be flowed through by a cooling medium, in particular coolant, the motors in particular being liquid-cooled. The cooling medium flows emerging from the ducts are made to converge and are fed at least proportionately by a first distributor to the gears in order to lubricate and cool the toothing parts thereof.
Abstract:
The invention relates to a method for controlling an optimal operating point in a synchronous machine and to an inverter-fed synchronous machine, wherein in a first method step according to the invention for the synchronous machine by means of a FEM method or by means of a measurement method a functional dependency of the voltage components Ud, Uq, UE upon the current components ld, lq, lE is determined, and from this according to formula (I) the respective dependency of the flux linkage components ?d, ?q, ?? upon the current components ld, lq, IE is determined, wherein R1 and R2 are the ohmic resistances of the corresponding windings of the synchronous machine. In a second method step according to the invention the synchronous machine is operated in regulated operation and an optimal operating point is controlled, (1) wherein a desired value of the exciting current is ascertained by solving the non-linear optimisation problem, formula (II), (2) wherein the ascertained desired value of the exciting current is used as desired value for an exciting current regulator, (3) wherein an actual value of the exciting current is ascertained by measurement or modelling, (4) wherein desired values of the stator current are ascertained using the ascertained actual value of the exciting current by solving the non-linear optimisation problem, formula (III), (5) wherein the desired values of the stator current are supplied to the stator current regulators.
Abstract:
The invention relates to a method for operating an electrical machine, especially a separately excited synchronous machine having an additional squirrel cage. The electrical machine comprises a rotor which is mobile relative to a stator winding, especially a rotatably mounted rotor, the rotor especially having an excitation winding and/or a squirrel cage. A unit supplying the electrical machine and especially having an inverter controlled by an electronic control unit, provides a stator voltage space vector and determines a stator current space vector. The stator current space vector so determined is controlled towards a rated value when the rotor is below a critical speed, especially the rate of the stator current space vector determined is controlled towards a rated value for the rate and the direction and/or speed of the stator current space vector is controlled towards a corresponding rated value for the direction and/or speed.
Abstract:
The invention relates to a method and a device for controlling a synchronous motor which is separately excited by an excitation winding, said excitation winding being supplied with a unipolar current on to which an additional signal is superimposed.
Abstract:
The invention relates to a method for operating a separately excited synchronous machine, to an electric machine and to the use thereof, wherein field coils are arranged at the rotor of the synchronous machine, wherein the synchronous machine is operated as a reluctance machine or as an asynchronous machine in case of non-energization of the field coils, in particular in case of emergency operation and/or excitation field failure.