The invention relates to a novel type of electric inductance arrangement for a series of applications in the field of distance measurement, sensor-based detection of objects, and construction of induction machines. The novelty consists in the type of inductance arrangement of the receiver or transmitter coil, said arrangement being designed in the form of a ladder rung arrangement, wherein the ladder spars short-circuit the rungs. The sum of all the short-circuit currents is an indicator of what is occurring in the surroundings of the arrangement. This could be changing magnetic fields caused by transmitter objects or additional ladder-rung systems acting as transmitters. Multiple such sensors and transmitters can be designed in the ladder-rung form, said sensors and transmitters being connected in parallel or in series according to the application under certain circumstances and if necessary assuming the excitation function by moving a conductor through which a direct current is flowing or by applying alternating currents. The aforementioned inductance arrangement results positively in that the coils can all have a completely crossover-free design and are therefore substantially simpler to technically implement for very different applications in electrical engineering. The applicability ranges from short-range distance measuring devices and long-range object location to light detection and efficient induction machines with large or also very small constructions.

A method for detecting a hardware configuration of a device intended to be carried aboard an aircraft turbomachine and controlled by a two-channel protection calculator (8), comprising a power supply able to supply the device, a first measuring box (16) able to measure a first voltage V.sub.s1 at the output of the device and a second measuring box (18) capable of measuring a second voltage V.sub.s2 at the output of the device: a) Send a control voltage to the input of the equipment Vc; b) Measure the first voltage V.sub.s1 and the second voltage V.sub.s2; c) Infer the hardware configuration of the device from the values of the first and second voltages measured V.sub.s1 and V.sub.s2.

Embodiments of the present disclosure are directed towards rotary variable differential transducers. The transducer may include a housing and an armature shaft included within the housing. The transducer may further include an input shaft configured to mate with an airplane shaft. The input shaft may be located independently from the armature shaft.

Multiple deflections of a structural member (SM) can be measured at multiple locations thereof, which deflections can be used to monitor changes in stiffness over time, using at least one antenna to measure the resonant frequencies at different harmonic frequency numbers of a predetermined radio frequency spectrum. One antenna can include a plurality of coils providing a first coil region that has a maximum sensitive to a first resonant frequency harmonic number and another antenna can include a plurality of coils providing a second coil region that has a maximum sensitivity to a second resonant frequency harmonic number that is different from the first predetermined resonant frequency harmonic number. Using different harmonic resonant frequency numbers, deflections at multiple regions of the SM can be determined concurrently using a plurality of antennae.

A steering and suspension assembly for the rear wheels of an off-road vehicle that is effective to turn the rear wheels of the vehicle at least 2° in either direction.

The invention relates to a novel type of electric inductance arrangement for a series of applications in the field of distance measurement, sensor-based detection of objects, and construction of induction machines. The novelty consists in the type of inductance arrangement of the receiver or transmitter coil, said arrangement being designed in the form of a ladder rung arrangement, wherein the ladder spars short-circuit the rungs. The sum of all the short-circuit currents is an indicator of what is occurring in the surroundings of the arrangement. This could be changing magnetic fields caused by transmitter objects or additional ladder-rung systems acting as transmitters. Multiple such sensors and transmitters can be designed in the ladder-rung form, said sensors and transmitters being connected in parallel or in series according to the application under certain circumstances and if necessary assuming the excitation function by moving a conductor through which a direct current is flowing or by applying alternating currents. The aforementioned inductance arrangement results positively in that the coils can all have a completely crossover-free design and are therefore substantially simpler to technically implement for very different applications in electrical engineering. The applicability ranges from short-range distance measuring devices and long-range object location to light detection and efficient induction machines with large or also very small constructions.

An electronic sensor includes a signal generator configured to output a first excitation signal and a second excitation signal and a variable differential transformer connected to the signal generator to receive the first excitation signal and the second excitation signal. The variable differential transformer may include a primary coil, a first secondary coil connected to the signal generator, a second secondary coil connected to the signal generator, and a core disposed at least partially in a magnetic field generated via the first secondary coil and the second secondary coil and the first excitation signal and the second excitation signal. A phase of an output signal of the primary coil corresponds to a position of the core.

A resolver assembly for a ducted-rotor aircraft is configured to detect and measure rotation of a spindle of the aircraft. The resolver assembly includes first and second gear-driven resolvers. The first and second resolvers are coupled about a shared pivot axis and are independently pivotable about the pivot axis to maintain engagement of the first and second resolvers with the spindle of the aircraft. The resolver assembly is configured such that the first and second resolvers are biased toward the spindle. The input shafts of the first and second resolvers are spaced from the pivot axis through respective first and second distances that extend outward from the pivot axis along respective first and second radial directions. The first distance is equal to the second distance and the first radial direction is not coincident with the second radial direction.

A magnetic core structure for a Linear Variable Differential Transducer (LVDT) comprising an elongate core of magnetic material mounted within a protective tube and means for positioning the core within the protective tube, the means for positioning comprising a ball provided within the protective tube at one end of the core, the ball being formed of an elastic material having a coefficient of thermal expansion selected to compensate the difference in elongation between magnetic core structure components caused by thermal expansion.

A device for acquiring signals from a sensor, the device comprising a differential amplifier, two bias resistors for biasing of the measurement device, a common mode and differential mode filter circuit, and two lightning limiter components. The differential amplifier is of the high common mode range type, the limiter components are dimensioned to reduce a lightning voltage to a maximum voltage value of the order of about one hundred volts and the filter circuit and the bias resistors are dimensioned to withstand that maximum voltage value. A correspond method for protecting a device against lightning.