Abstract:
The invention relates to a position detector comprising: a Wiegand module, which is composed of a Wiegand wire with a coil that surrounds the Wiegand wire; a measurement substrate, which defines a measurement plane and on which a first Hall element and a second Hall element are arranged, wherein the Hall elements are arranged on the measurement substrate such that their areas that are sensitive to a magnetic field extend in the measurement plane and/or form a part of the measurement plane; a processing electronic system, which comprises the first and the second Hall element and which is configured to evaluate an output signal that is output from the first Hall element and an output signal that is output from the second Hall element; and a permanent magnet assembly, which is movable relative to the Wiegand module and to the first and the second Hall elements in one direction as well as in a direction that is opposite to said one direction; wherein upon a movement of the permanent magnet assembly in said one direction, the coil of the Wiegand module generates a voltage pulse, if a north pole or a south pole of the permanent magnet assembly is located at a first position, and upon a movement of the permanent magnet assembly in said opposite direction, the coil of the Wiegand module generates the voltage pulse, if the north pole or the south pole of the permanent magnet assembly is located at a second position that is different from the first position, in an autonomous mode, in which the position detector is not supplied with external energy, the first and the second Hall elements and the processing electronic system are supplied with energy, which is provided by the Wiegand module, and the first Hall element and the second Hall element are arranged such that the processing electronic system, by the evaluation of the output signal of the first Hall element and the output signal of the second Hall element, obtains at least redundant information about whether the permanent magnet assembly moves in said one direction or in said opposite direction.
Abstract:
The mass of a fluid flowing through a flow rate meter at a temperature which fluctuates in a given temperature range is determined by driving an exciter magnet system through the fluid with an exact correlation between the fluid volume flowing there through and the movement path covered by the exciter magnet system, producing a measurement voltage pulse after each passage through a movement path corresponding to a unit volume of the fluid by means of a Wiegand wire and a coil surrounding same, at each measurement time charging a first energy storage means by electric energy contained in each measurement voltage pulse, and using same as operating energy for measurement of the instantaneous temperature of the fluid, producing a temperature value as an integral multiple of the smallest temperature measurement unit to be resolved and an integral count value including said temperature value, and adding same to a sum contained in a non-volatile storage means from the precedingly ascertained count values for forming an ongoing sum in the non-volatile storage means and passing same to a processor which can be supplied with external energy and which calculates therefrom the temperature-corrected delivery volume of the fluid.
Abstract:
There is described a sensor unit (3) for a rotary encoder which serves for detecting the rotary movements of a drive shaft (1) in both directions and which has a single-stage transmission with an input gear (15) which is arranged concentrically with respect to and is non-rotatably connected to the drive shaft (1). The sensor unit includes an absolute segment counter which serves for counting the angle segments through which the drive shaft passes within each 360° rotation and has the following components: a magnetic segment counter exciter arrangement non-rotatably mounted on the second gear (16) of the transmission, that engages into the input gear, a stationary segment counter sensor arrangement which includes a Wiegand or pulse wire (28) with wound-on induction coil (29) and which delivers electrical pulses whenever the magnetic segment counter exciter arrangement passes through predetermined angular positions, and an electronic circuit (32) which counts said electrical pulses, stores the respectively acquired count value and calculates therefrom the instantaneous angular position of the drive shaft having regard to the transmission ratio of the transmission.
Abstract:
A pick-up for the inductive production of a measurement signal reproducing the relative position of first and second bodies which are movable relative to each other includes at least one exciter coil operable with alternating current for the production of a magnetic flux, a measurement coil arrangement at which voltages from which the measurement signal is derived can be taken off, and a flux guide means of ferromagnetic material for carrying the magnetic flux produced by the exciter coil on a closed measurement path in such a way that at least a part of the magnetic flux passes through the measurement coil arrangement, and at least one of the voltages which can be taken off at the measurement coil arrangement changes in dependence on the movement of one of the bodies relative to the other. To achieve a high degree of measurement accuracy and characteristic fidelity, the measurement signal is formed as a quotient of first and second intermediate signals of which at least one depends on the instantaneous position of one of the bodies relative to the other, and each of the intermediate signals involves differences of voltages which the measurement coil arrangement supplies.
Abstract:
In an electric motor (11) with at least one winding (14) through which an electric current flows to produce a relative movement between a stator portion and a reaction portion, with at least one magnet (12), the field of which passes through the winding, and with at least one body (20) of ferromagnetic material which is arranged in the fields of the magnet and winding in order to achieve the minimum structural configuration with the maximum outputtable force, it is provided that the winding is immovably connected to the magnet at least in the direction of the relative movement and that the body of ferromagnetic material is mounted movably relative to the winding and the magnet in the direction of the relative movement, and has an air gap (22) which extends transversely to said direction of relative movement and which is so arranged that the magnetic flux in the winding alters as a result of the relative movement of the air gap with respect to the winding and the magnet.
Abstract:
A measuring cable with spaced measuring stations is laid. The measuring stations each have a sensor whose electrical conductivity depends on an ambient variable such as temperatures light etc., each sensor is provided with a control arrangement which, due to a transmitted signal from a control center, connects its sensor to a constant current source and returns a signal indicative of any voltage change dependent on the variable ambient which signal is measured by the control center. The measuring cable is divided into sections each having a selectable circuit which can be selected individually by the control center. A clock pulse signal is transmitted to all measuring stations but is only active for the cable section which has been selected. In this manner, the cable section can be chosen as desired, the time required for the control center to have access to certain measuring stations is shortened and semiconductor switches can be used because measurements are only made in the steady state.
Abstract:
A method for the slip-free hauling of a rope, or similar, flexible force transmitting element, comprises guiding, moving, and controlling the rope over and/or by ways of a clamping roller or pulley resulting in a looping angle of less than 360.degree.. The rope may be moved and controlled either directly by hand or with a control device. A slip-free hauling apparatus comprises a housing, a clamping pulley, a relative and/or an absolute arresting system, in an operating or control device, a gearing system and a brake clutch. The gearing system is used to step down the force of the rope. The control device is used to modify the slippage of the rope. An auxiliary device initiates and controls the braking, releasing, and arresting of the rope.
Abstract:
An apparatus for extracting water from the atmosphere has a chamber or a pair of chambers connected to a compressor by a valve controlled in its operation in response to an operating condition in the chamber or chambers. A suction fan is connected to the chamber or chambers to move air through the chambers. A further valve is arranged in the respective inlet to the chamber or chambers to facilitate an expansion condition or effect in the respective chamber. Where two chambers are used they operate in alternate fashion so that heat is supplied to one chamber while heat is being withdrawn from the other chamber and vice versa, and both chambers are controlled in response to the respective operating condition therein.
Abstract:
The invention relates to an absolute position sensor comprising: a Wiegand module, which is composed of a Wiegand wire with a coil surrounding the Wiegand wire; a measurement substrate, which defines a measurement plane, and which comprises a plurality of Hall elements, wherein the Hall elements are arranged on the measurement substrate such that their active surfaces, which are sensitive to a magnetic field, extend in the measurement plane and/or form a part of the measurement plane; a permanent magnet arrangement, which is movable in a movement plane, which is parallel to the measurement plane, relative to the Wiegand module and to the measurement substrate in one direction as well as in a direction that is opposite to the one direction, wherein upon a movement of the permanent magnet arrangement in said one direction, the coil of the Wiegand wire generates a voltage pulse, if a north pole or a south pole of the permanent magnet arrangement is at a first position, and upon a movement of the permanent magnet arrangement in the opposite direction, the coil of the Wiegand module generates the voltage pulse, if the north pole or the south pole of the permanent magnet arrangement is located at a second position that is different from the first position; a micro-controller; and a processing electronic system, which is arranged on the measurement substrate, and which comprises at least a control electronic, a volatile data memory and a non-volatile data memory as well as the Hall elements, which are realized on the measurement substrate in a common integrated circuit on the basis of identical integration technology, wherein the control electronic is configured (i) in a non-autonomous mode, in which the position sensor is supplied with external energy, to transfer output signals of a group of the Hall elements to the micro-controller for determining a precise posture of the permanent magnet arrangement with respect to a reference posture, and to obtain a value, which corresponds to the number of repeating motion sequences of the permanent magnet arrangement, for storing in the volatile and/or the non-volatile data memory either on the basis of an output signal of one of the Hall elements, or to obtain such a value from the micro-controller, and (ii) in an autonomous mode, in which no external energy is available and the position sensor is supplied with energy, which is provided by the Wiegand module, to determine the value, which corresponds to the number of repeating motion sequences of the permanent magnet arrangement, on the basis of an output signal of at least one of the Hall elements as well as to store the value in the volatile data memory and to transfer the value, which is stored in the volatile data memory, to the non-volatile data memory, if the energy, which is available in the autonomous mode, falls below a threshold value.
Abstract:
A position sensor for ascertaining the fine position value z of a movable body includes an exciter unit moving therewith and a stationary sensor unit (7) which simultaneously delivers a plurality of output signals jointly describing the fine position value. In a calibration mode there is established a defined relationship between the exciter unit and a calibration unit (31) such that groups of amplitude values can be taken off from said output signals and groups of average values are formed therefrom, which are fed to the calibration unit (31) which converts them into reference values using the calibration fine position values μ(z) and stores same with the associated fine position as an associated values multiplet in a comparative value memory (14). In each measuring mode groups of amplitude are taken off from the output signals from which groups of measuring values are produced by averaging and are fed to a computing unit (10), which forms differences of cross products from the reference values of varying groups of reference values and the current measuring value group and causes said differences to go towards zero to ascertain the current fine position value.