Abstract: A synchronous reluctance motor, in particular a four-pole synchronous reluctance motor includes a stator with 48 stator grooves for receiving a winding system; a reluctance rotor, which is spaced apart from the stator by an air gap. The reluctance rotor has axes with a high magnetic conductivity (d-axis) and axes with low magnetic conductivity (q-axis). Provision is made for an arrangement of magnetically conductive flux-conducting portions and magnetic flux barriers, which are arranged such as to form the d-axis and the q-axis of the reluctance rotor. The reluctance rotor has a geometric groove separation angle of ?r 6° or 10°, which angle is between two adjacent magnetic flux barriers at the air gap.

Abstract: A protective circuit for a semiconductor switch includes a clamp diode, an NPN bipolar transistor, a PNP bipolar transistor, a capacitor connected in parallel with the base-emitter path of the PNP bipolar transistor, and at least three resistors. The bipolar transistors are connected to a thyristor structure that is connected to the cathode of the clamp diode. A first resistor is connected in parallel with the base-emitter path of the NPN bipolar transistor. A first terminal of the second resistor is connected to the base of the PNP bipolar transistor. Either a third resistor is connected in parallel with the base-emitter path of the PNP bipolar transistor, or a first terminal of the third resistor is connected to the emitter of the PNP bipolar transistor and the second terminal of the third resistor is connected to the second terminal of the second resistor.

Abstract: Various embodiments include a method for manufacturing a magnetic sheet comprising: positioning a nonmagnetic sheet with recessed regions; filling the recessed regions with a soft-magnetic material using additive manufacturing; and fixing the soft-magnetic material to the sheet in a material-bonded manner.

Abstract: An electrical network includes feed-in devices, loads, and a distribution grid, which is arranged therebetween and comprises at least one busbar and at least one device for opening or closing a DC circuit. The at least one device includes: an electric switch for opening or closing the DC circuit; a fault current detection device; a trigger unit; a precharging device; and a control unit for automatically closing the electric switch after the precharging process. The electric switch opens the DC circuit via the trigger unit if a fault current is detected by the fault current detector, and the precharging device restores the voltage on the busbar prior to closing the electric switch. Multiple loads can be individually electrically separated via a respective electromechanical switch, and multiple loads can be electrically separated as a group via the at least one device.

Abstract: A fastener for connecting a first housing part of a steam or gas turbine to a second housing part of the turbine which is made of a parent metal with a high degree of stress relaxation.

Abstract: Various embodiments include a method for security management at a scanning system installed outside a monitored system. The method comprises: acquiring first information for identification of a mobile storage device; generating third information to indicate current status of files on the mobile storage device; and sending the first information and the third information to a monitoring system to check if usage of the mobile storage device in the monitored system is secure.

Abstract: An electrical feedthrough for a pressure housing includes two feedthrough elements having substantially matching external shape and dimension. Each feedthrough element extends straight along an element axis between a first element end portion and a second element end portion. A connecting element is releasably connected to the feedthrough elements and has opposite sides, with one of the opposite sides having a contact area upon which the first element end portion of one of the feedthrough elements abuts, and with the other one of the opposite sides having a contact area upon which the first element end portion of the other one of the feedthrough elements abuts. At least one of the feedthrough elements includes an electrical feedthrough conductor which extends along the element axis of the feedthrough element and abuts a connecting conductor of the connecting element.

Abstract: Various embodiments of the teachings herein include a computer-assisted energy management method for an energy system, in which an operation of the energy system is regularly simulated according to a set call time interval for a set time horizon with a set time increment, comprising: determining whether a first parameter changes; performing an additional simulation of the operation of the energy system deviating from the set call interval based on the changed parameter; and/or within at least one critical time range in which a value of the first parameter is above a threshold value, performing a regular simulation which falls within the critical time range with a time increment which is smaller or greater than the set time increment; an operating the energy system according to either the additional simulation or the regular simulation.

Abstract: An electric switch includes a thermal tripping unit which, when a thermal budget acting on it is exceeded, trips and switches off the electric switch. In an embodiment, the tripping unit includes an adjustment module which, as a function of an accessory connected to the electric switch, uses an actuating element to set a tripping element of the thermal tripping unit such that the heat effect of the accessory is compensated for in the event of tripping.

Abstract: An electrical network is equipped with feed-in devices, loads, a distribution grid arranged therebetween, at least one semiconductor switch, and at least one electromechanical switch for separating a feed-in device or a load in the event of a fault. The feed-in devices and loads are arranged in groups which are connected together by a busbar and paired semiconductor switches. Each feed-in device and load can be separated from the grid by an electromechanical switch in the event of a fault, and the individual groups of feed-in devices and loads can be separated from one another by the semiconductor switches in the event of a fault in order to prevent cross currents on the busbar.

Abstract: A system (500) for controlling a linear alternating current (AC) electrodynamic machine (400) includes a linear AC electrodynamic machine (400) with a stationary part (410) with a plurality of discrete stationary sections (412, 414, 416), each stationary section (412, 414, 416) having a poly-phase circuit; a variable frequency drive (VFD) (510) configured to be coupled to a utility power source and to provide output currents, wherein the VFD (510) is operable coupled to the stationary part (410) of the linear AC electrodynamic machine (400) for powering and controlling the stationary sections (412, 414, 416) of the stationary part (410); and a plurality of switches (512, 514, 516) coupled between the VFD (510) and the stationary part (410), wherein the plurality of switches (512, 514, 516) allow connecting or disconnecting the VFD (510) to or from the stationary sections (412, 414, 416).

Abstract: A plurality of sequentially consecutive sections of a linear drive are each controlled case by a respective control device that is assigned to a respective section of the plurality of sequentially consecutive sections, where converters that are controlled by the respective control device each individually apply current to a subsection of the respective section, and collectively to the respective section, control devices each specify new desired values to the converters they control, the respective control device controls each respective convertor of a plurality of converters, and where the control devices communicate, via respective peer-to-peer interfaces having real-time capability, with a number of other control devices that control sections.

Abstract: A tubular combustion chamber system for a gas turbine unit includes a plurality of annularly arranged transition lines, which are designed to be connected at the upstream ends thereof to respective burners and to conduct hot gas produced by the burners to a turbine. The tubular combustion chamber system has a hot gas distributor, which is designed to be connected to the turbine and defines a ring channel, which is open to the turbine and into which the downstream ends of the transition lines lead. A gas turbine unit includes a plurality of annularly arranged burners, a turbine and a tubular combustion chamber system which connects the burners to the turbine.

Abstract: Various embodiments of the teachings herein include a method for operating a machine tool comprising: during a machining process in which a first workpiece of a first batch is machined using the machine tool, detecting a measured variable using a detection device of the machine tool; determining a measured value characterizing the machining process as a function of the measured variable using an electronic computing device; and comparing the determined measured value with a reference function determined before the machining process using a reference machining process carried out before the machining process using the machine tool and/or by a further machine tool and stored in an electronic memory device, the reference function characterizing the reference machining process to machine a second workpiece of a second batch.

Abstract: The invention relates to a method for operating a self-commutated inverter (1), which is supplied from a direct voltage circuit (3) and comprises electronic switches (S1, S2, S3) for producing a three-phase output voltage and a three-phase output filter (5) which is connected downstream of the electronic switches (S1, S2, S3) and is coupled to the direct voltage circuit (3). The electronic switches (S1, S2, S3) are controlled in an open-loop manner by space-vector modulation, in which a zero-phase-sequence system voltage is controlled in a closed-loop manner by filter-input voltages of the output filter (5) on the basis of a target-voltage space vector (u?, ?_s) of the space-vector modulation and filter input currents (i1_in, 12_in, i3_in) of the output filter (5) such that oscillations in a zero-phase-sequence system of the filter input currents (i1_in, i2_in, i3_in) are suppressed.

Abstract: A machine tool includes a machine control unit to output control signals to drives for machine elements. A tool which machines a workpiece is thereby moved relative to the workpiece in a position-controlled manner. Arranged in a first region of one machine element is an active vibration damper to damp vibration in a second region of the machine elements as the workpiece is machined by the tool. In order to detect the vibration, a first sensor is arranged in the first region of the machine element and a second sensor is arranged on another machine element or in a different region of the one machine element. Actual values detected by the first and second sensors and corresponding target values are supplied to a dual controller which determines on the basis of these values, a resulting manipulated variable for the active vibration damper and actuates the active vibration damper accordingly.

Abstract: Various embodiments of the teachings herein include an end plate comprising: a device for receiving a bearing internally with an inner fastening circle; and fasteners for fastening the end plate to the housing of the electric machine externally with an outer fastening circle. The end plate has a geometry suitable for counteracting the deformation of the first natural frequency overcoming a flat and/or planar shape, or side, respectively, of the end plate by bending the end plate, with the same or a reduced mass and/or wall thickness of the end plate.

Abstract: Elements of a machine are moved relative to one another along several axes. A monitoring device receives groups of position values of the axes which specify the relative position of the elements to one another. The surfaces and/or volumes of the elements taking up working space are determined therefrom. The monitoring device checks whether a collision risk between the elements exists. The monitoring device models at least parts of the surfaces of the elements with two-dimensional splines defined by nodes and checkpoints. The monitoring device further determines from the checkpoints of the splines for sections envelopes which envelop respective element in the respective section, and uses the respective envelope as a surface that is taken up by the respective element in the respective section. Boundary lines of faces of the envelopes are straight connecting lines of the checkpoints.

Abstract: A motor includes a cooling enclosure. The cooling enclosure includes a cover body, an inner fan, and an outer fan. A first cooling cavity, a second cooling cavity, and an isolating cavity between the first cooling cavity and the second cooling cavity are formed in the cover body. A plurality of first and second cooling pipes are respectively disposed in the first and second cooling cavity; both being in communication with the isolating cavity and the outside. The cover body includes a first surface and an opposite second surface. The inner fan is disposed on the first surface. Sides of the inner fan are respectively in communication with the first and second cooling cavities. The inner fan is configured to provide circulating power for internal circulating air. The outer fan is in communication with the isolating cavity. The cooling enclosure and the motor can realize relatively high cooling efficiency.

Abstract: A control system of a technical installation includes an operator station client and an operator station server that has a visualization service and stored object models of technical objects of the technical installation and generates an XY trend diagram with an operating point visualized in the XY trend diagram from a first measurement value associated with the first technical object and a second measurement value associated with the second technical object, and transmits the XY trend diagram with the operating point to the operator station client via the visualization service, wherein the XY trend diagram and/or the operating point has a reference to an object model, the operating point is influenceable by the technical object underlying the referenced object model, and an operator of the operator station client is visually presented with the referenced object model via the visualization service when selecting the operating point in the XY trend diagram.