Abstract: An electric machine rotor, which extends along an axis of rotation, including a short-circuit cage, the or each first connection means between a respective first end part of the or each bar and the first short-circuit ring includes a plurality of flexible electrically conductive blades.

Abstract: A power switch apparatus for a power converter includes a semiconductor power switch and a gate drive unit connected to the semiconductor power switch for supplying gate drive signals to the semiconductor power switch to switch it on and off to cause the power converter to generate an alternating current voltage having a nominal operational frequency based on command signals received from a controller. The gate drive unit receives command signals based on the AC voltage to be generated and to alter the switching events of the semiconductor power switch by addition of a pre-defined jitter-like deviation to the gate drive signals such as to cause the power converter to generate an AC voltage having a modified operational frequency which partly and temporarily deviates from the nominal operational frequency by a pre-defined minimum percentage. A power converter comprising such a power switch apparatus is also disclosed.

Abstract: Provided is a method for performing automatic modularity control of an inverter and an inverter that includes DC power sources configured to supply DC power, a plurality of converters to convert direct current power to alternating current power to be supplied to a load, and a controller. The controller performs automatic modularity control of the plurality of converters, by separately controlling the plurality of converters and detecting an operation status thereof and performs fault detection at the plurality of converters at an early stage and isolates a respective converter of the plurality of converters, while continuously supplying power to the load via remaining converters of the plurality of converters. The automatic modularity control further includes early fault detection based continuous monitoring of the current produced by each converter and semiconductor switching feedback and cyclic starting of the inverter to normalize the lifecycle of the circuit breaker.

Abstract: This propulsion unit for an aquatic vehicle consists of a mobile casing mounted in a pivot connection in relation to a hull element of the aquatic vehicle, a drive shaft of a propeller, said shaft being mounted rotatably within the mobile casing by means of at least one bearing consisting of a closed space adapted to be filled with a hydraulic fluid, an electrical machine being adapted to drive the rotary drive shaft in relation to the mobile casing, where the propulsion unit further consists of a module for conditioning the hydraulic fluid contained in the closed space of the bearing. The propulsion unit also consists of a control device to control the conditioning, the control device consisting of a temperature sensor and capable of activating the conditioning of the hydraulic fluid contained in the closed space according to the temperature measured by the temperature sensor.

Abstract: A method for controlling a back-to-back three-phase three-level converter having a grid-side AC/DC converter and a machine-side DC/AC converter connected by a split DC link which defines a DC link midpoint. The method includes controlling the grid-side converter to convert AC power from a grid into DC power of the DC link, controlling the machine-side converter to convert DC power from the DC link to AC power to feed a low frequency machine, and concurrently performing common mode voltage injection for the machine-side converter so as to at least partially compensate midpoint voltage ripple caused by the machine-side converter. The method further includes performing common mode voltage injection for the grid-side converter so as to at least partly further compensate the portion of the midpoint voltage ripple which remains uncompensated by controlling the machine-side converter. A control system implementing the control method and a power conversion system utilizing same.

Abstract: A direct current (DC) circuit breaker for power transmission or distribution system includes a current sensor for sensing current of a system, a controller, a physical switch, and multiple switch modules. The multiple switch modules are electrically coupled to the current sensor and the physical switch in series. Each switch module includes multiple base elements electrically coupled in parallel. Each base element includes a first silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) and a second SiC MOSFET electrically coupled in an opposite series connection mode. The first and second SiC MOSFETs are configured in a synchronous rectification mode by channel reverse conduction control. The controller controls the multiple switch modules to connect current in the system, and break current of the multiple switch modules according to sensed current signals from the current sensor.

Abstract: Provided is a deionized-water cooling system having a main circuit for cooling electrical equipment. The system includes a deionizer circuit including (i) a deionizer for producing deionized water and (ii) a throttle and a main pumping system configured for circulating (i) the deionized water within the main circuit at a first flow rate and (ii) the water flow within the deionizer at a second flow rate. The circulating occurring when the electrical equipment is operating. The electrical equipment is configured for receiving power from a primary power source. Also included is a secondary pumping system configured for (i) receiving power from a secondary power source, (ii) circulating the deionized water within the main circuit, and (iii) circulating the water flow within the deionizer at the second flow rate via the throttle when the electrical equipment is inoperable.

Abstract: A bus bar assembly includes a first main conductor, a second main conductor, and an insulator member provided between the main conductors. The insulator member includes: (i) an insulator component, (ii) a first conductor layer provided on the top surface of the insulator component, and (iii) a second conductor layer provided on the bottom surface of the insulator component, wherein the first conductor layer includes an outer edge around a perimeter thereof, wherein the outer edge is located at least a certain distance from the outer edge around the perimeter of the insulator component, wherein the second conductor layer includes an outer edge around a perimeter thereof, wherein the outer edge is located at least the same certain distance from the outer edge of the insulator component, and wherein the certain distance is sufficient to cause the bus bar assembly to satisfy the creepage requirement of the assembly.

Abstract: A power distribution system is described. The system includes a main ac busbar and an emergency ac busbar. A hybrid drive system includes an induction electrical machine and a prime mover, the rotor of the electrical machine and the driving end of the prime mover being mechanically coupled to a load by means of a mechanical linkage such as a gearbox. The system includes a first active rectifier/inverter having ac input terminals electrically connected to the main ac busbar, and dc output terminals. The system includes a second active rectifier/inverter having dc input terminals electrically connected to the dc output of the first active rectifier/inverter by a dc link, and ac output terminals electrically connected to the induction electrical machine. A blackout restart system includes a rectifier having ac input terminals selectively electrically connectable to the emergency ac busbar and dc output terminals selectively electrically connectable to the dc link.

Abstract: Provided is a system for regulating temperature change of semiconductor components within a converter. The system includes a temperature regulator in communication with at least one semiconductor within the converter and a power source, the temperature regulator comprising a controller. Also included is a peak detector in communication with at least one of the semiconductors and configured to identify a maximum temperature of each semiconductor when the semiconductor conducts high current.

Abstract: A method for operating an electrical circuit, in particular of a converter is described. The circuit, in at least one embodiment, includes a line-side converter that is coupled to a capacitor. The line-side converter includes at least two series connections, each including at least two power semiconductor elements, and each of the at least two series connections being connected parallel to the capacitor. The line-side converter is coupled to an energy supply system. The DC voltage that is present at the capacitor is determined. A maximum voltage is predetermined. If the DC voltage present at the capacitor is determined to be greater than the maximum voltage, then at least two of the power semiconductor elements are switched into their conductive state in such a manner that the capacitor is discharged in the direction of the energy supply system.

Abstract: An electric drive-train for a ship includes a first generator having a rotatable shaft structured to be driven by a first prime mover and an output providing a voltage; a second generator having a rotatable shaft structured to be driven by a second prime mover and an output providing a voltage; an electric machine including a rotatable shaft structured to drive a propeller; a first power electronic converter electrically interconnected with the output of the first generator and structured to power the electric machine; and a second power electronic converter electrically interconnected with the output of the second generator and structured to power the electric machine. A support structure replaces a reduction gear box and supports the first generator, the second generator, the electric machine, the first power electronic converter, and the second power electronic converter.

Abstract: A method for feeding electrical power into an electrical power supply network is described. A configuration for supplying electrical power in the form of DC voltage has been provided and it is connected to the power supply network through an inverter. An MPP tracker (31) has been provided for influencing the inverter, from which an intermediate circuit desired voltage (udc, ref) is determined. A modulation regulator (33) has been provided, from which a given reactive power desired value (Qref) is changed to a reactive power value (Q*). The inverter (17) is influenced by the intermediate circuit desired value (udc, ref) and the reactive power value (Q*).

Abstract: A support structure is used to mount the stator of a rotating electrical machine (e.g. a motor or generator). The support structure includes a rigid external support frame (6). To minimise the transmission of vibrations caused by stator electromagnetic forces into the external support frame (6), at least one sandwich anti-vibration mount (14a) is secured between the external support frame (6) and a part of the stator (28). The mount (14a) is oriented relative to the stator such that it experiences compression loading in a substantially tangential direction of the stator and radial shear loading in a substantially radial direction of the stator during operation of the rotating electrical machine. The sandwich anti-vibration mount (14a, 14b) is pre-loaded with a pre-determined compression load substantially along its compression axis (Ac).

Abstract: Described is a circuit for converting electric power between a three-phase grid and a single-phase grid. The circuit includes, in at least one embodiment, a first transformer that is connected to the three-phase grid, a number of first converter stages assigned to the first transformer, the associated DC intermediate circuits and the associated second converter stages. The second converter stages are connected to each other at the alternating-current side outputs with the aid of a series connection.

Abstract: A multi-phase electric circuit including an electric machine and an inverter, wherein machine encompasses a rotor connected to the inverter via at least two brushes for each phase, wherein each of the brushes of each phase is connected to the inverter via a separate brush line.

Abstract: A method for operating a slave node of a digital bus system is described. The slave node comprises two sending and receiving devices. In the bus system, an input data frame is sent to a master node in input direction. The slave node receives the input data frame by the first sending and receiving device. The slave node stores service data packets contained in the input data frame in a FIFO memory. The slave node attaches at least one process data packet of its own to a last process data packet in the input data frame. The slave node attaches the service data packets to the process data packet, which is now last, in the input data frame. The slave node sends the input data frame, which was changed in this manner, to the next node in input direction by the second sending and receiving device.

Abstract: Described is a modular switch for an electrical converter. The modular switch is provided with a first series circuit including a first controllable power semiconductor component and a first diode as well as with a second series circuit including a second diode and a second controllable power semiconductor. The connecting point between the first power semiconductor component and the first diode forms a first terminal and the connecting point between the second diode and the second power semiconductor component forms a second terminal of the modular switch. Also provided is a capacitor, wherein the first series circuit and the second series circuit and the capacitor are switched parallel to each other.

Abstract: The present invention provides a method of controlling the height of a looper in an inter-stand section of a hot strip mill that overcomes the problem of looper instability due to looper inertia without the need for the controller of upstream rollers to have a reduced gain. The inter-stand section of the hot strip mill comprises a pair of upstream rollers driven by a main motor and a looper driven by a looper motor. The method comprises the steps of: calculating a desired speed trim to be applied by the main motor; estimating the inertia of the looper; calculating a torque necessary to overcome the inertia of the looper from the speed trim, the estimated inertia of the looper and a sensitivity calculated from the geometry of the looper; and controlling the main motor to apply the speed trim to the upstream rollers and controlling the looper motor to apply the calculated torque to the looper.

Abstract: A rotary drum apparatus comprising a drum rotatable around a longitudinal axis, and at least one electric motor for driving the drum in rotation around the longitudinal axis, each drive motor comprising a stator and a rotor, the rotor comprising at least one ring portion joint together with the drum and extending substantially perpendicularly to the longitudinal axis. The stator of each drive motor extending against a part of circumference of the drum perpendicularly to the longitudinal axis.