Abstract: An electric motor with permanent-magnet excitation, particularly an internal-rotor or external-rotor motor, having motor parts which are movable relative to one another. One motor part forms a multi-pole excitation field in an air gap by means of permanent magnets and the other motor part comprises a coil configuration situated in the air gap. The coil configuration is free of soft-magnetic material. The permanent-magnetically excited motor part includes a cylindrical yoke having substantially radial slots which are uniformly spaced about the circumference and in which the permanent magnets are mounted. The permanent magnets are magnetized in a circumferential direction with directions of magnetization which change from magnet to magnet.

Abstract: In a film scanner for optically scanning a film for obtaining a picture signal, which film is moved at a constant speed, an image position correction which is as motion-independent as possible, is ensured in that the film scanner at least doubly scans at least parts of each film image and determines image position errors by comparing the two scanning signals of the same nominal image content, and corrects the picture signal in dependence upon the determined image position error.

Abstract: A transient voltage protection circuit for operating a lamp includes input terminals for connection to a supply voltage source which delivers a low-frequency AC voltage. A rectifier is coupled to the input terminals for rectifying the low-frequency AC voltage and has output terminals. A first branch comprising a series arrangement of a breakdown element and a first capacitor interconnects the output terminals and a second branch shunts the first capacitor for discharging the first capacitor. A further capacitor, across which a DC voltage is present during lamp operation, supplies an operating voltage to the lamp. A DC--DC converter is coupled to the output terminals and to the further capacitor and a third branch comprising a series arrangement of a diode and the further capacitor shunts the first capacitor.

Abstract: An electromagnetic actuator (1) comprises two actuator sections which are translatable relative to one another along an actuator axis (1a) and which are rotatable about the actuator axis, a first actuator section (1) comprising a coil system and a second actuator section (3) comprising a permanent magnet system for cooperation with the coil system via an air gap. The coil system is arranged on a magnetically conductive yoke (5) and comprises a cylindrical translation coil (9) and a toroidal rotation coil (7), which are coaxial with the actuator axis. The permanent magnet system comprises an annular magnet (11), which is coaxial with the actuator axis, for cooperation with both the translation coil and the rotation coil. The magnet has a radial magnetisation (B) which is interrupted by an annular segment (13). The magnetically conductive yoke has a central core (5b) around which the translation coil is arranged and a shell (5a) on which the rotation coil is disposed.

Abstract: A circuit for operating a discharge lamp includes input terminals for connection to a supply voltage source and a first apparatus coupled to the input terminals for generating a low-frequency alternating current from a supply voltage delivered by the supply voltage source. A second apparatus is coupled to the input terminals for generating from the supply voltage a further current which is superimposed on the low-frequency alternating current. The polarity of the further current is the same as that of the low-frequency alternating current. As a result, instabilities do not arise in the discharge arc of a high-pressure discharge lamp operated by the circuit.

Abstract: An echograph of the type involving signal processing in the time domain with correlation-interpolation of the echographic signals is adapted to measure radial displacement velocities of the walls of an artery. A frame is scanned with a period T of a few ms at a rate of one excitation per line, and the correlations-interpolations are performed between collinear excitation lines shifted by the period T (52), enabling velocity values V(x,z,t) to be obtained for storage in a first memory (55) and amplitude values A(x,z,t) for storage in a second memory (57). These values are subsequently processed (60) in order to deduce dilatation and compression curves therefrom.

Abstract: For use by an emulation circuit, a non-special-custom microcontroller multiplexes a port among user data and program store addresses. It has a multistate machine cycle with plural clock pulses per state. Various additionally provided emulation pins allow for outputting to an emulation circuit any or all of the following signals:a start-of-cycle pulse indicating non-sleep modea state-wise recurrent signal signalling progress of said states during non-sleep modea signal discriminating between idle and reseta multiplexed signalization among any or all of the following:that a next-following machine cycle is the first of a next instruction;that presently an interrupt is being processed;that an external program memory access is forthcoming;that an external data memory access occurs;that an external data memory write access occurs.

Abstract: An electrical connecting device having a receptacle and a two part plug inserted into the receptacle. The two part plug includes an inner part for holding a plurality of zero gap insulation displacement connectors and an outer part for receiving a corresponding plurality of insulated wires. The inner part of the plug can be inserted partially or fully within the outer part of the plug. When the inner plug part is in its partially assembled position, the insulated wires can be easily inserted into the outer part of the plug. When in its fully assembled position, the plurality of connectors within the inner part of the plug are in electrical contact with the insulated wires.

Abstract: An electronic ballast for powering at least two rapid start, parallel connected fluorescent lamps. Associated with each lamp is a serially connected choke and capacitor combination. A train of pulses of alternating polarity having a fundamental frequency, which is generated by an inverter, is applied to each serially connected combination. Each combination is characterized by a resonant frequency which is other than an odd harmonic of and at least two times and preferably .sqroot. 5 times greater than the fundamental frequency. Reduction in filament heating, following lamp ignition, is provided through the addition of voltages applied to each filament which are substantially out of phase with each other.

Abstract: A ballast filter in which the ballast can operate at a total harmonic distortion of power line current of less than 10%. Power dissipated by the filter when at a THD of less than 10% is relatively low. The input impedance of the ballast is chosen to be no greater than twice the equivalent filter impedance of a front end filter and no less than the equivalent filter impedance/1.5. The filter includes a transformer having a core which at times operates within the non-linear region of its B-H curve under nominally rated ballast load conditions.

Abstract: A device and method for insulating a dry film capacitor includes a pair of electrically non-conductive discs having knurled protrusions extending therefrom. The dry film capacitor includes a core for receivingly engaging the protrusions to thereby secure the discs to the capacitor. The discs are dimensioned such that the discs when placed on the interior surface of a ballast can serve as supports for the capacitor by raising the capacitor away from contact with the ballast can. In connecting the discs to the capacitor, the protrusions are twistingly pushed into the core of the capacitor.

Abstract: The inductor has a winding arranged on a straight magnetic core formed by, for example, a ferrite cylinder (4) accommodated in a cylinder (1) made of a moulded plastics material and having a longitudinal groove in its outer cylindrical surface, in which groove a bar (2) of an electrically resistive material is mounted, the bar being fixed underneath the winding wire (3). The inductor is used for the injection of low-frequency current into a cable of a CATV system.

Abstract: A circuit for igniting and operating a discharge lamp includes a DC-AC converter provided with a first branch coupled to a DC voltage source and including at least one switching element for generating an alternating current at a frequency f. A load branch is coupled to the first branch and includes inductive means, capacitive means, and an inductor for coupling the lamp to the load branch. A control circuit switches the switching element at the frequency f and includes a resonant circuit of a further inductor and a further capacitor. An ignition voltage limiter includes a second branch coupled to the resonant circuit and comprising a series arrangement of a frequency-dependent impedance and a semiconductor element of variable impedance as a function of its control electrode potential. A third branch is coupled to the load branch and to the control electrode of the semiconductor element for influencing the potential of the control electrode dependent upon the lamp voltage.

Abstract: A power amplifier suitable for use in n communication transmitter/transceiver which transmits bursts of signals in accordance with a TDD or TDMA protocol. Shaping the leading and trailing edges of the transmitted bursts is done using a feedback control loop around a substantially linear power amplifier (22). A modulated signal to be amplified is multiplied by an output of the control loop using a multiplier (28) and the product is applied to the power amplifier (22). A portion of the amplified signal is applied to a detector (38), the output of which is applied to one input of a difference amplifier (42), a second input of which receives a step-like reference signal of a predetermined amplitude. The difference signal produced is integrated (46) and low pass filtered (48) or vice versa, which slows down the difference signal to provide an output signal of the control loop which has the desired leading edge shape.

Abstract: A system useful echographic examination simulation and training includes an ultrasonic echograph (31) equipped with a TV monitor (32), a 3D probe (33) for analyzing a subject, acquisition means (39), a memory card (42) storing the detected acoustic lines and a workstation (34) with central processing unit (35) and 3D echography memory (38). For reading the latter memory (38), the system includes a viewing device including a dummy (56) simulating the subject, and a 3D orientation sensor (52) connected to the workstation via a 3D coordinate indicator (54) and display means (29) of the workstation, which make the sectional plane which the sensor defines on the dummy correspond to the equivalent plane contained in the form of voxels in the echography memory (38), and display this plane on the screen of the TV monitor (32).

Abstract: A system for equipment control comprises a plurality of equipment units and actuator units. These units are linked by a common communication channel, for example a wired bus. Each of the units has a unique address and further associated with a programmable memory for storing therein an event table. The event table comprises event fields, and associated address fields and instruction fields. When the unit changes state--called an event--addresses of other units and corresponding instructions are retrieved from the event table and transmitted to said other units via the common communication channel. The transmitted instructions cause the corresponding other units to change state, for example to be switched on or off.

Abstract: The invention relates to a circuit arrangement for igniting a high-pressure discharge lamp (L), provided with input terminals (C,D) for connection to a commutating supply source with a square-wave supply voltage; a pulse-generating circuit (IV) provided with a voltage-dependent breakdown element (3) and with a voltage-raising network (2) formed by a network of rectifiers and capacitors; a pulse transformer (1); and an electrical connection between a secondary winding (12) of the pulse transformer and lamp connection terminals (E,F). The voltage-raising network (2) is in addition provided with inductors means (21, 22). The result of this is that a strongly increased voltage is available across the breakdown element substantially instantaneously after each commutation of the commutating supply voltage.

Abstract: A controller for controlling a non-linear mechanical system having a plurality of degrees of freedom, comprises compensation means to compensate the non-linear behavior of the mechanical system, the controller further comprises a reference model of both a control unit and the linearized mechanical system, and the controller further comprises adaptation means which adapts the compensation means in dependence on a difference between an output signal of the mechanical system and an output signal of the reference model.

Abstract: A circuit arrangement for operating a high-pressure discharge lamp provided with a ballast circuit VI for generating a current through the high-pressure discharge lamp from a supply voltage. A controller is provided for controlling the power consumed by the high-pressure discharge lamp. The run-up behavior of the high-pressure discharge lamp is governed by an apparatus III for controlling the luminous flux of the high-pressure discharge lamp and by a device IV for the automatic activation of the controller after the run-up of the high-pressure discharge lamp. As a result, the luminous flux of a high-pressure discharge lamp operated by the circuit arrangement has the same, substantially constant value during substantially the entire time duration of the run-up of the high-pressure discharge lamp as during stationary lamp operation.

Abstract: A piezoelectric actuator, which has a large displacement rate and a relatively simple structure, is capable of providing an output without the need for a specific support and can be manufactured at low costs, is provided. The piezoelectric actuator 10 takes a planar plate-like form and has first and second layer regions 11 and 12 lying one upon the other. The first layer region 11 is formed comprising a piezoelectric ceramic material and contains electrodes 13-1 to 13-n for receiving an actuation voltage to cause this first layer region to contract in a plane parallel thereto. The second layer region 12 is formed integrally with the first layer region 11 and comprises a ceramic material.