Patent application number | Description | Published |
20080252336 | Non-Contacting Interrogation of System States - A device for non-contacting interrogation, without auxiliary power, of system states of a part that is rotatable relative to a fixed part comprises a coil on the rotatable part and a coil on the fixed part. The coils are mutually coupled, one being fed by a signal generator generating different frequencies, whilst the other coil is supplemented with at least one capacitance to form a resonance circuit. Further impedances can be added by means of switch elements to change a resonance frequency and form an interrogation circuit. By determining a resonance frequency on a signal generator side it is possible to draw conclusions about an impedance on an opposite side and to assign this to a switch element which is closed. | 10-16-2008 |
20090276199 | Inductive Rotary Joint - An inductive rotary joint for non-contact transmission of electrical energy between a stationary part and a rotating part of the rotary joint comprises a power generator for generating an alternating voltage or an alternating current, which feeds a load by means of a rotatable power transmitter. An electrical parameter on the primary side of the power transmitter is determined with a measurement means, and from this, the condition of another electrical parameter at the load is approximated by means of a functional unit. Regulation of the power generator is effected with this approximated value. | 11-05-2009 |
20090279829 | Lens Arrangement for Optical Rotary Joints - According to one embodiment, an optical rotary joint comprises a first collimator arrangement for coupling-on first light-waveguides, and a second collimator arrangement for coupling-on second light-waveguides, with the latter being rotatably supported relative to the first collimator arrangement about a rotation axis. A Dove prism is provided between the first and second collimator arrangements as a derotating element. The first and second collimator arrangements have at least one micro-lens array on which light-waveguides with associated ferrules are disposed. In order to avoid tensile forces from arising in the arrangement, or as a result of individual ferrules becoming interconnected by an applied adhesive, trenches, barriers, or also coatings are provided between the individual ferrules. | 11-12-2009 |
20090296441 | Semiconductor Power Switch - A semiconductor power switch comprises at least a first IGBT and a second IGBT. The collectors of the first and second IGBTs are connected to each other, and the emitters of the first and second IGBTs are connected to each other. The first IGBT is an IGBT type with a comparatively low collector-emitter on-voltage and a comparatively high turn-on or turn-off switching energy. In contrast thereto, the second IGBT is an IGBT type with a comparatively high collector-emitter on-voltage and a comparatively low turn-on or turn-off switching energy. Both IGBTs receive gate signals from a control circuit for switching the power switch on during a first time interval and switching the power switch off during a second time interval. The control circuit is designed to supply an on-signal to the second IGBT during the whole first time interval and another on-signal to the first IGBT during only a part of the first time interval, which is less than the whole. | 12-03-2009 |
20100034492 | CT SCANNER GANTRY WITH AEROSTATIC BEARING AND SEGMENTED RING MOTOR - Disclosed is a device having a rotor that is adapted to be rotated relative to a stator, with hydrostatic bearings being used as radial bearings and as axial bearings of the rotor. A motor is provided as a direct drive, having a ring-shaped part and also a plurality of motor segments which are in magnetic engagement with the ring-shaped part. In order to generate additional bearing load force, additional motor segments having permanent magnets are provided. For reasons of safety, axial support rolls are provided which, when the motor has attained a given bearing load force, are spaced from a running face of the rotor, and which, in a case of too low or an absence of load force, prevent a displacement of the rotor away from the axial bearings. | 02-11-2010 |
20100090536 | INDUCTIVE ROTARY JOINT WITH LOW LOSS SUPPLY LINES - An inductive rotary joint for computer tomographs includes an inverter and an inductive rotary coupler. A primary winding of the inductive rotary coupler is fed by the inverter via a line, with energy transmitted by the inductive rotary coupler being supplied to a load through a secondary winding. The line includes at least two coaxial lines, each coaxial line having an outer conductor or shield with the two outer conductors or shields being interconnected along a major part of their length, and an inner conductor, with the inner conductors being supplied by the inverter with voltages, the sum of which is substantially equal to zero. | 04-15-2010 |
20100091935 | NON-CONTACTING ROTARY JOINT WITH CLOCK MODULATION - A non-contacting data path for rotating data transmission of digital data from a data source to a data sink includes at least one clock modulator. A data clock frequency is specifically modulated with the clock modulator to widen a spectrum of data signals and achieve improved EMC properties in measurements according to valid EMC Standards. Owing to use of a plurality of clock modulators along a course of a non-contacting rotary transmission path, signal jitter caused by individual components of the data transmission path is in each case replaced by artificially caused jitter of clock modulation. Thus, data transmission with defined jitter and defined signal quality can be achieved. | 04-15-2010 |
20110206319 | Capacitive Rotary Joint For Optical Signals - A non-contacting rotary joint for transmitting an input signal guided within an input optical waveguide has an electrical transmission line and a probe. The transmission line has an even number N≧4 of equal length transmission line segments. The optical waveguide is connected to an optical distribution network which has an optical power splitter for splitting the input signal into N or N/2 individual signals of equal optical power. These signals are forwarded to opto-electrical converters to generate electrical signals for driving the electrical transmission line. The lengths of the optical transmission lines are adjusted so that the propagation time of the optical signal from the end of the input optical waveguide to the end of each individual optical transmission line is approximately the same. | 08-25-2011 |
20110248727 | Method for Compensation of System Tolerances in Inductive Couplers - A method is disclosed for compensation of system tolerances in an inductive coupler which includes a power generator that feeds an alternating current into a series resonance circuit formed by a resonance capacitor and an inductive rotating transmission device. First, a brief sequence of at least one period of an alternating current is fed by the power generator into the series resonance circuit. Then the series resonance circuit is short-circuited. A first resonance frequency is measured. Then a longer sequence having a plurality of periods of an alternating-current voltage is generated by the power generator, so that a given small voltage is built up at the load. Now a second resonance frequency is measured whilst the resonance circuit is short-circuited. Then at least one correcting variable for the power generator is determined from the two resonance frequencies. | 10-13-2011 |
20120307977 | Contactless Rotary Joint with Safety Function - Inductive rotary joint system with stationary and rotating sides has a one-phase rectifier for receiving a one-phase AC-input to generate low-level DC-voltage, and a three-phase rectifier for receiving a three-phase input to generate higher-level DC-voltage. An AC-power generator received the DC-voltage and generates an AC-power, which is coupled by an inductive rotary joint to a load at the rotating side. When connected to the one-phase AC-input only, couples a comparatively lower voltage to the load. When connected to the three-phase AC-input, the AC-power generator couples a comparatively higher voltage to the load. A control unit at the secondary side for controlling at least the load is connected to measure the voltage produced for the secondary side, and to distinguish between a comparatively lower voltage and a comparatively higher voltage. When a presence of a comparatively higher voltage is indicated, an x-ray tube is enabled within the load. | 12-06-2012 |
20130187740 | Rotating Power Transformer - Rotating power transformer having stationary and rotating parts. At least one of these parts includes a plurality of transformer segments preferably made of plastic material. Rectangularly shaped soft magnetic cores are held within the transformer segments together with at least one winding located in the soft magnetic cores, thereby facilitating simple and efficient assembly of the rotating power transformer. | 07-25-2013 |
20130214614 | CONTACTLESS ROTARY JOINT - A contactless rotary joint has a stationary and a rotating part. Furthermore at least one of the parts has a rotary joint body made of a plastic material and holding a capacitive data link and a rotating transformer. The rotating transformer has a magnetic core for transmission of electrical power. To prevent interference of the capacitive data link by electrical and/or magnetic fields from the rotating transformer a shield is provided. | 08-22-2013 |