DE102010009166B4 - hysteresis - Google Patents

Abstract

Hysteresis unit (1) as a hysteresis clutch or hysteresis brake with a hysteresis carrier (2) and a magnet carrier (3) whose mutual axial position (4) via an adjusting means (5) which is connected to hysteresis carrier (2) or magnetic carrier (3) is variable, wherein the adjusting means (5) is connected to a motor drive, characterized in that the adjusting means (5) via a thread pairing (6) with the motor drive as a rotary drive (7, 8) formed is connected to the adjusting thread for the actuating means (5) and wherein means are provided with a pointer (9) and a signal generator (10) for detecting the axial movement (12) of the actuating means (5) which generate a digital output signal at at least one point within the range of motion (11); as soon as the pointer (9) exceeds said signal generator (10), the digital output signal being detected shortly before one end of the movement region (11), and another digital output signal is generated at a second location by a further pointer (9) and a further signal generator (10), wherein the second location has a predetermined distance from the first location and wherein pointer (9) and signal generator (10) with each other on the light barrier effect communicate based, in which the respective pointer runs over a corresponding light barrier and that a stepper motor (7) is provided as a motorized rotary drive.

Description

The invention relates to a hysteresis according to the preamble of the main claim.

Such hysteresis units find use as a hysteresis clutch or hysteresis brake.

They are based on the hysteresis principle. In this case, a magnet carrier occupied with magnetic material is arranged opposite to a hysteresis carrier.

The two carriers rotate relative to each other. The driving force is adjusted via the mutual axial position.

The advantage of such hysteresis units is the freedom from wear.

Therefore, such hysteresis serve in particular as Hysteresebremsen, z. B. in the gate of thread bobbins for the production of warp beams.

Without limiting the invention, however, the present application is also intended to detect hysteresis clutches.

Finished hysteresis units are available as a central rotating arrangement or a face turning arrangement. The present invention is intended to refer to both embodiments.

In a central rotation arrangement, one of the two carriers is designed as a dip cylinder, which changes its axial position to the other carrier, which is made annular, by immersing in the annular carrier.

With such a central rotation arrangement, the immersion depth is linearly related to the hysteresis effect.

In a face turning arrangement hysteresis carrier and magnet carrier are axially spaced apart and the axial position is changed over the distance.

In such a face turning arrangement, the hysteresis effect is described by a mathematical hyperbola.

Within the scope of the present invention, both arrangements should be considered equivalently side by side.

This means that the term "axial position" in the case of an end arrangement is to be understood as the axial distance and in the case of a central rotation arrangement as the immersion depth.

Nevertheless, both embodiments should always be covered, unless it is expressly pointed out that the respective other embodiment should not be included.

It is known in this respect, to adjust the axial distance between Hysteresering and magnetic ring via an electric motor drive in such hysteresis units, the z. B. acts on a threaded spindle which engages in an internal thread of the actuating means.

The adjusting means serves the purpose of displacing the hysteresis ring or the magnetic ring axially with respect to the respective other ring.

The advantage of such thread pairings lies in particular in the self-locking.

In such hysteresis units, there is the danger that the motorized rotary drive can drive the adjusting means for shifting hysteresis ring or magnetic ring to block. As a result of the very significant reduction between electric motor drive and threaded spindle there is the danger of unduly high forces or excessive wear.

The publication EP 0 855 515 A1 relates to a generic hysteresis unit with a hysteresis carrier and a magnetic carrier whose mutual axial position via an actuating means which is connected to hysteresis carrier or magnetic carrier, is variable, wherein the actuating means is connected to a motor drive. The publication WO 2006/058 688 A2 relates to an adjustable Hysteresemitnehmer, with an input side mechanically driven rotor part and / or a stator, with an output side, rotatably connected to a shaft anchor part, with a Hystereseteil which is connected to the anchor part, wherein the stator at least one electromagnet or permanent magnet, by means in which a magnetic flux can be induced in the rotor part and / or the stator part, and in which the adjustment of the transmittable torque can be carried out electromagnetically or electromechanically. The publication DE 10 2006 007 924 A1 relates to a permanently excited magnetic brake comprising a support roller rotatable about a fixed axis, a magnetic element and a hysteresis element and an adjusting device by means of which the position of the magnetic element and hysteresis element is adjustable relative to each other. The publication DE 197 05 290 A1 relates to a hysteresis with a, with a roller rotatably connected hysteresis ring and with Magnetic poles provided magnetic ring. The magnet ring made of permanent magnet material is arranged within the hysteresis ring, wherein the magnetic poles are impressed alternately along the outer circumference of the magnet ring. The magnetic ring comprises a support member which is secured against rotation, but is mounted axially displaceably on the axle via an adjusting device. The publication DE 10 2008 053 166 A1 relates to a sealed hysteresis clutch or brake, consisting of a drive member which is equipped with an annular hysteresis and an output member which is arranged concentrically to the drive part and equipped with permanent magnets, wherein between the hysteresis and the permanent magnet forms an annular air gap, and that the drive part and a cup-shaped flange. The permanent magnets are arranged on a magnet carrier which is arranged to be movable in the axial direction relative to the stationary hysteresis material. The layout DE 29 21 032 B1 relates to a device for monitoring the switching state of a switchable clutch, wherein a magnetic circuit closes over both coupling parts and a sensor for scanning the switching state dependent on the stray field is arranged. The patent DE 691 06 120 T2 relates to a device for measuring the position change of a rotor in a drive system comprising a drive rotor and a driven rotor, which is mounted concentrically with respect to the drive rotor, wherein the drive rotor and the driven rotor are magnetically coupled together, a conduit means fixed with With respect to the rotors, a means for measuring the EMF produced in the conduit means while the rotors are rotating, and means for determining from the measurement the position of one of the rotors with respect to the fixedly mounted means , The publication DE 10 2006 004 065 A1 relates to a spring brake for a truck with a brake disc, which is rotatably mounted on a rotatable motor shaft, a brake housing fixed in a vehicle brake magnet, an axially movable rotatable pressure plate between the brake disc and brake magnet, which is biased by a spring assembly against the brake disc, and a Device for monitoring the switching state of the spring brake, wherein on the brake housing, a proximity switch is mounted and wherein an initiator for the proximity switch is connected to the pressure plate. The publication DE 195 10 519 A1 relates to a circuit arrangement for diagnosis, monitoring and / or control of energy conversion systems, in particular of electromagnetically switchable clutches and brakes, by means of a sensor which generates a system-specific signal in connection with a control electronics, which is supplied to a transmitter. The publication DE 199 22 251 A1 relates to an arrangement for optical ventilation monitoring in an electromagnetically released spring pressure brake, with an axially displaceable armature disc for cooperation with a brake rotor and the electromagnet of the coil housing, wherein by a coil housing to the axially parallel through hole for receiving an optical sensor for interacting with the armature disc for determining the armature disc position in Dependent on Bestromungszustand the brake is provided. The publication WO 2010/010385 A1 relates to vehicular transmissions having a clutch pack for transmitting a torque, a force actuated clutch pack actuator, and a passive magnet assembly which in conjunction with the actuator provide a non-force contribution to the energized clutch pack actuation, the passive magnet assembly having a closeable air gap assembly of permanent magnet material and magnetic material arranged to cooperate with each other to generate a magnetic circuit, so that a movement of the actuator is supported in an opening or closing operation of the clutch pack. The patent DE 601 31 064 T2 relates to a parking brake system for vehicles with an actuator with an electric drive motor and an electronic control unit, wherein a reduction gear is provided with an input connected to the output of the electric motor and an output member for connection to mechanical brakes of the vehicle. The publication DE 36 085 34 A1 relates to a self-shutdown of an electric motor with a motor shaft on which a permanent magnet is rotatably seated. Upon rotation of the shaft of the permanent magnet takes a freely rotatable seated on the shaft eddy current body, which is moved against a resiliently yielding stop and turns in against its spring force deflected stop a switch for the power supply to the electromagnet. If the shaft is blocked, eddy currents are no longer generated in the eddy current body and the resilient stop moves the eddy current body out of its position actuating the switch, so that the power supply to the electromagnet is switched off. The patent DD 1 19 673 relates to a direction of rotation-dependent switch for a rotating shaft, which is coupled by a mounted on the shaft magnet system with pole pieces and the pole pieces opposite, separately rotatably mounted eddy current armature, which is coupled to a switching device.

It is an object of the present invention to eliminate the stated disadvantages of a hysteresis unit of the generic type.

This object is achieved by the features of the main claim.

An essential aspect of the invention is based on detecting the axial movement of the actuating means at at least two positions within the entire range of motion and in each case converting the crossing of these locations into a digital output signal.

This is advantageously carried out by the interaction of a respective pointer with a respective signal generator, wherein pointer or signal transmitter are mounted on the adjusting means and signal transmitter or pointer stationary.

Within the scope of the present application, the terms "pointer" and "signal generator" are to be understood generally.

It is essential in any case the generation of a respective digital output signal from the circuit arrangement according to the invention.

In this respect, a digital output signal can also be generated via an analog signal in conjunction with an electronic threshold circuit.

The analog signal could be generated for example via a potentiometer, which is then abandoned the threshold circuit.

If the threshold value is exceeded, a respective digital output signal would then be generated, which is used as the basis for the further control.

It is therefore a total of a digital output signal, which is forwarded electronically to fulfill predetermined functions of the hysteresis unit.

According to the invention, another digital output signal is generated in accordance with the features of the main claim at another location of the movement range.

In this way, the range of movement of the actuating means is monitored in accordance with and it can be essential to the invention avoided that the motorized rotary drive at the end of the adjustment each runs on block.

The arrangement of the signal generator within the freely adjustable and not running on block adjustment thread is therefore essential to the invention.

The digital output signal can, for. B. generated at a point shortly before hysteresis ring and magnetic ring get mutual contact or in the case of a central rotation assembly, the full immersion depth or the full extended position is reached.

Then, the electric motor drive is polarized via the digital output signal, so that it can only run in the direction of rotation in which the distance between hysteresis ring and magnet ring increases again or the immersion depth changes in a predetermined manner.

Since it is a stepper motor that can be controlled digitally, it is also possible to count from there the steps that can be covered within the entire range of motion without risk of collision according to the geometric conditions.

According to the invention, a further digital output signal is generated in the region of the other end of the movement range, so that from there the stepping motor can be correspondingly reversed in order to exclude a risk of collision even at this end of the movement range.

Conveniently, the respective pointer and signal transmitter are housed within a closed housing, in which also the actuating means sits.

Pointers and signalers communicate with each other on the basis of the photoelectric barrier effect.

The arrangement of pointer and signal generator within the housing disturbances of adjacent hysteresis units, as present in particular in the process gate for the production of warp beams can be avoided.

Appropriately, the housing then has a cable bushing and a separate control board.

On the control board then the electronic modules for stepper motor control, for position evaluation and power supply are provided.

If you also want to use small stepper motors with low torques, it is advisable to provide a step down gear between the stepper motor and the actuating means.

In the following the invention will be explained in more detail with reference to an embodiment.

1 shows a hysteresis unit in the form of a hysteresis brake.

A hysteresis ring 2 is screwed for this purpose on a ring carrier, the z. B. consists of aluminum.

The common hub is seated on a rotatably mounted in the housing output shaft, which points to the right out of the housing.

Thus, the hysteresis would be 2 rotatable together with its mounting ring and the hub and the right outgoing shaft.

Opposite the hysteresis ring 2 sits a magnetic ring 3 , also on a support and a common hub, which also forms the adjusting means.

Over the above shown in a longitudinal slot of the housing pin prevents the actuating means 5 in the housing turns.

In the center of the actuating means 5 a central thread is introduced, which is pierced by the coming from the left and also mounted in the housing shaft.

For this purpose, the shaft has at its right-facing end a thread which in a corresponding internal thread of the actuating means 5 intervenes.

If the shaft now rotates, it will be over the thread pairing 6 between the right-pointing shaft end and the internal thread of the actuating means 5 an axial displacement of the actuating means 5 causes within the possible range of motion 11 lies.

It is essential now that a pointer 9 and an associated signal generator 10 are provided, which for detecting the axial movement 12 of the actuating agent 5 serve.

This will be at a point within the range of motion 11 a digital output signal is generated as soon as the pointer 9 the said signal generator 10 exceeds.

The arrangement of pointers 9 and signalers 10 relative to each other can according to the invention at any point within the range of motion 11 lie.

Appropriately, however, become the pointer 9 and the associated signal generator 10 provided at a location where the actuating means 5 just before one end of the range of motion 11 the pointer 9 at the signal transmitter 10 passes by.

This measure offers the advantage that at least in the direction in which pointer 9 and signal generator 10 toward the end of the range of motion 11 be relocated, run on block of the actuating means 5 is prevented.

Further, Figure 1 shows that another digital output is generated at a second location that is a predetermined distance from the first location.

For this purpose is another pointer 9 with another signal generator 10 intended. In the embodiment shown is rigid with the actuating means 5 an axially extending rod connected to which suitable pointer 9 are attached.

The two places where the digital output signal is generated, z. B. provided by suitable fork light barriers.

Now runs one of the pointers 9 via the appropriate light barrier, the on-off signal is given via appropriate lines for processing.

Shown is also the arrangement of pointer 9 and signalers 10 inside a closed housing 13 so that the hysteresis brake shown can readily be used in large quantities in the tightest of places, as z. B. in the run gate of coils for the production of warp beams is the case.

pointer 9 and signaling device or reading device 10 Communicate with each other on the light barrier effect.

So that the generated digital signals can be led out of the housing, the housing has a cable feedthrough. There run the signal line (s), in which the digital output signals to a control board 15 be guided.

The control board 15 serves to accommodate electronic modules for stepper motor control, for position evaluation and for the power supply for the stepper motor.

In that regard, the motorized rotary drive is a stepping motor 7 which also has a downstream gear stage 8th on the actuator 5 acts, which with the thread pairing 6 for the axial displacement of the actuating means 5 is provided.

LIST OF REFERENCE NUMBERS

1

hysteresis

2

Hystereseträger

3

magnet carrier

4

axial position

5

actuating means

6

thread pairing

7

stepper motor

8th

gear stage

9

pointer

10

signaler

11

range of motion

12

axial movement

13

casing

14

Grommet

15

control board

Claims (6)

Hysteresis unit ( 1 ) as a hysteresis clutch or hysteresis brake with a hysteresis carrier ( 2 ) and a magnetic carrier ( 3 ) whose mutual axial position ( 4 ) via an actuating means ( 5 ), which with hysteresis carrier ( 2 ) or magnetic carrier ( 3 ) is variable, wherein the actuating means ( 5 ) is connected to a motor drive, characterized in that the actuating means ( 5 ) via a thread pairing ( 6 ) with the motorized rotary drive ( 7 . 8th ) formed motor drive which is the adjusting thread for the actuating means ( 5 ) and where means with a pointer ( 9 ) and a signal generator ( 10 ) for detecting the axial movement ( 12 ) of the actuating agent ( 5 ) are provided, which at least one point within the range of motion ( 11 ) generate a digital output signal as soon as the pointer ( 9 ) said signal generator ( 10 ), wherein the digital output signal just before one end of the movement range ( 11 ) and another digital output signal at a second location from another pointer ( 9 ) and another signal generator ( 10 ), wherein the second location is a predetermined distance from the first location and wherein pointers ( 9 ) and signal generator ( 10 ) communicate with each other based on the light barrier effect, in which the respective pointer runs over a corresponding light barrier and that a stepper motor ( 7 ) is provided. Hysteresis unit ( 1 ) according to claim 1, characterized in that pointers ( 9 ) and signal generator ( 10 ) within a closed housing ( 13 ), in which also the actuating means ( 5 ) is housed. Hysteresis unit ( 1 ) according to claim 2, characterized in that the housing ( 13 ) a cable feedthrough ( 14 ) owns. Hysteresis unit ( 1 ) according to claim 3, characterized in that on the outside of the housing ( 13 ) a control board ( 15 ) is attached. Hysteresis unit ( 1 ) according to claim 4, characterized in that the control board ( 15 ) Contains means for receiving electronic components for stepper motor control, for position evaluation and for power supply. Hysteresis unit ( 1 ) according to one of claims 1 to 5, characterized in that between the stepping motor ( 7 ) and the actuating means ( 5 ) a reducing gear stage ( 8th ) is provided.

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