Abstract: The present disclosure relates to a flow-generation system and to a method for its operation. The flow-generation system has a plurality of flow-generation units, which are each configured to generate an individual fluid flow, in particular an air flow. For this purpose, the flow-generation unit can comprise an electromotively operated fan, for example. A local controller has a processor, a working memory, and a process scheduler, and is connected to a communication network for communication via a communication interface. A control task can be processed in parallel by a network group by means of a plurality of local controllers of the flow-generation units belonging to the network group when one single local controller does not have enough computing power and/or memory capacity for processing the control task.

Abstract: The invention relates to a control system (1) comprising a multi-motor inverter (PWR) for the controlled parallel operation of a number of n EC motors (M1, . . . , Mn) whose respective rotor position is detected sensorlessly and controlled by the common inverter.

Abstract: The invention disclosure relates to a measuring assembly for measuring a parameter on an electrical device, in particular an electric motor. The electrical device is controlled by means of an inverter circuit. The measuring assembly has a measuring circuit which is electrically connected, by means of a measuring line, to a sensor unit having at least one sensor output of the inverter circuit. At least two different inverter output potentials can be applied to the control line depending on the switching state of the inverter output or of the inverter circuit. The measuring circuit is designed to transmit an output signal to the sensor unit and to detect and electrical measurement variable on the measuring line and/or the control line. On the basis of the received output signal, the sensor unit influences the electrical measurement variable depending on the parameter to be detected, for example the temperature. For example, for this purpose the sensors may have a parameter-dependent resistor.

Abstract: A circuit arrangement configured to execute DC link processing with simultaneous reduction of the harmonic components in the input current, i.e., for usability or applicability in different power supply networks, particularly both in single-phase and three-phase networks with the same circuit topology or in the event of the failure of a phase.

Abstract: Device for detecting fault states in an electric machine comprising a rotor and a stator arranged so as to be electrically isolated from the rotor, comprising a connection electronics system for connecting the electric machine, wherein either the stator is connected by means of an electrical connection to a first electrical potential of the connection electronics system, said first electrical potential being stable with respect to the ground potential, or the stator is directly connected to a second electrical potential, which is stable with respect to the ground potential, and the second electrical potential is connected to the connection electronics system by means of the electrical connection, wherein a first sensor for measuring a first phase current and a second sensor for measuring a second phase current and a third sensor for measuring an electrical signal of the stator is formed via and/or at the electrical connection.

Abstract: An analog circuit arrangement (1) to variably set a voltage Uout, within defined voltage limits, has a non-inverting adder (10) with a positive input (11). A voltage divider (20), with at least a first stage (21) and a second stage (22), is connected to the positive input (11) of the adder (10). At least one stage has a parallel circuit of n resistors (R1, R2, . . . , Rn) that are each connected in series in a conduction path (L1, L2, . . . , Ln) to an overcurrent protection device (F1, F2, . . . , Fn). At least one device (30) actively changes one or more of the overcurrent protection devices (F1, F2, . . . , Fn) into a state that interrupts the respective affected conduction path (L1, L2, . . . , Ln).

Abstract: An electrical machine including a stator, a rotor and a bearing arrangement having a first bearing and a second bearing on opposite sides of the stator as well as a shielding arrangement comprising a first shielding unit and a second shielding unit. The rotor is rotatably supported around a rotation axis by means of bearings. The shielding units are electrically conductive and comprise a ring part in each case that extends originating from a radial inner end to a radial outer end away from the rotation axis. Preferably each shielding unit has a circumferential part on its radial outer end that extends in a continuous ring-shaped manner around rotation axis and is arranged in overlapping manner with the adjacent axial end of stator winding in axial direction. The circumferential parts are preferably completely closed, whereas the ring parts can comprise through holes.

Abstract: A system (1) has a control device (10) with central electronics (11) designed for connection and operation of differently coded electric motors (En), with different motor characteristics (Mn) and/or power classes (Ln), to a device connection (12) of the control device (10). The at least one electric motor (En) is selectable from a number (n) of electric motor (En), that can be connected as intended, has a coding element (Kn). The central electronics (11) have a coding capture device (2) to recognize, via coding element (n), the motor characteristics (Mn) and/or the power class (Ln) of the respective currently connected electric motor (En).

Abstract: The invention relates to a device for reducing harmful bearing voltages in an electrical machine (M) fed by a DC link voltage of a DC link, said electrical machine comprising a stator (3), which has windings (7) and is insulated from ground (GND), and a rotor (2) and a motor shaft, wherein furthermore a rotor-side bearing (LAR) and a stator-side bearing (LAS) are each insulated from the ground (GND) and the rotor (2) and the stator (3) are electrically connected to each other by means of a bypass capacitance (CBypass) having a predefined capacitance.

Abstract: The invention relates to a device and a method for monitoring a DC link capacitor (CZK) in an electrical DC link of a circuit (1) operated on a mains voltage Vac, the circuit comprising a power factor correction filter (PFC) and an inverter (20), the DC link capacitor (CZK) to be monitored being between the power factor correction filter (PFC) and the inverter (20). During the operation of the circuit (1), the DC link capacitance C of the DC link capacitor (CZK) is determined at least at certain time intervals over the operating time by measuring a power ripple W of a DC link voltage VZK, which DC link voltage arises at the DC link capacitor (CZK), said power ripple pulsing at twice the frequency of the mains voltage, and the remaining service life or the service life end and/or usability end of the DC link capacitor (CZK) is determined, by means of an evaluation circuit (30), from the DC link capacitance C determined in this way.

Abstract: A circuit arrangement configured to execute DC link processing with simultaneous reduction of the harmonic components in the input current, i.e., for usability or applicability in different power supply networks, particularly both in single-phase and three-phase networks with the same circuit topology or in the event of the failure of a phase.

Abstract: A device (1) to reduce harmful bearing voltages in an electrical machine (M) fed by a DC link voltage of a DC link. The electrical machine has a rotor (2) and a stator (3) with windings (W), and is insulated to ground. At least two bearings (4), with an outer bearing ring (4a) and an inner bearing ring (4i), are between the rotor (2) and the stator (3). A shielding arrangement (S) is between the windings (W) of the stator (2) and the respective outer bearing rings (4a). A stator electrical connecting arrangement (5) is connected to a potential that is stable with respect to the DC link.

Abstract: An electrical machine including a stator, a rotor and a bearing arrangement having a first bearing and a second bearing on opposite sides of the stator as well as a shielding arrangement comprising a first shielding unit and a second shielding unit. The rotor is rotatably supported around a rotation axis by means of bearings. The shielding units are electrically conductive and comprise a ring part in each case that extends originating from a radial inner end to a radial outer end away from the rotation axis. Preferably each shielding unit has a circumferential part on its radial outer end that extends in a continuous ring-shaped manner around rotation axis and is arranged in overlapping manner with the adjacent axial end of stator winding in axial direction. The circumferential parts are preferably completely closed, whereas the ring parts can comprise through holes.

Abstract: A device for wirelessly transmitting and receiving data of an RFID tag introduced in an electromagnetically shielded housing, wherein a transmission region is provided in the housing wall of the housing and wherein a transceiver is connected to the RFID tag. The transceiver is configured to transmit and/or receive data from the RFID tag through the transmission region, wherein a double coil formed by two coil assemblies is provided directly above or below the transmission region for coupling to an external receiving unit of a reading device and for coupling to the transceiver.

Abstract: A system (1) has a control device (10) with central electronics (11) designed for connection and operation of differently coded electric motors (En), with different motor characteristics (Mn) and/or power classes (Ln), to a device connection (12) of the control device (10). The at least one electric motor (En) is selectable from a number (n) of electric motor (En), that can be connected as intended, has a coding element (Kn). The central electronics (11) have a coding capture device (2) to recognize, via coding element (n), the motor characteristics (Mn) and/or the power class (Ln) of the respective currently connected electric motor (En).

Abstract: An analog circuit arrangement (1) to variably set a voltage Uout, within defined voltage limits, has a non-inverting adder (10) with a positive input (11). A voltage divider (20), with at least a first stage (21) and a second stage (22), is connected to the positive input (11) of the adder (10). At least one stage has a parallel circuit of n resistors (R1, R2, . . . , Rn) that are each connected in series in a conduction path (L1, L2, . . . , Ln) to an overcurrent protection device (F1, F2, . . . , Fn). At least one device (30) actively changes one or more of the overcurrent protection devices (F1, F2, . . . , Fn) into a state that interrupts the respective affected conduction path (L1, L2, . . . , Ln).

Abstract: A control system (1) comprising a multi-motor converter (PWR) for the closed-loop control of a number of n EC motors (M1, . . . , Mn) operated in parallel, the rotor position of each motor being detected without a sensor and being controlled by the converter they share.

Abstract: The invention relates to a method for the closed-loop and open-loop control of two or more EC motors operated using a common converter, wherein for the purpose of setting the operating point of the EC motors, common open-loop or closed-loop control using at least one controller is provided, wherein a combination of at least two control options is provided and in this case a controlled variable regulates the voltage setting at the output of the converter such that the two or more EC motors follow an intended sequence of operating points in a stable manner.

Abstract: The disclosure relates to a device for wirelessly transmitting and receiving data of an RFID tag introduced in an electromagnetically shielded housing, wherein a transmission region is provided in the housing wall of the housing and wherein a transceiver connected to the RFID tag is also provided, which transceiver is configured to transmit and/or receive data from the RFID tag through the transmission region, wherein a double coil formed by two coil assemblies is provided directly above or below the transmission region for coupling to an external receiving unit of a reading device and for coupling to the transceiver.

Abstract: An apparatus (1) for reducing bearing voltages in an electric machine (M) with a rotor (2) and a stator (3). A rotor-side and stator-side bearing outer ring (4r, 4s) and a respective bearing inner ring (4i) are provided between the rotor (2) and stator (3). A connection electronics system connect with the motor (M). A compensation arrangement (20) adjusts the potential (ULA-stator) of the bearing voltage at the bearing outer rings (4r, 4s) and the respectively corresponding bearing inner ring (4i) to an identical value. The compensation arrangement (20) comprises an impedance (ZKOMP), of at least one first impedance (ZKOMP, R) between the stator (3) and the rotor-side bearing outer ring (4r). The impedance (ZKOMP) has at least one impedance (ZKOMP. S) between the stator (3) and the stator-side bearing outer ring (4s).