EP1343181A2 - Magnétisation des corps de mesure magnétiques - Google Patents

Magnétisation des corps de mesure magnétiques Download PDF

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Publication number
EP1343181A2
EP1343181A2 EP03005277A EP03005277A EP1343181A2 EP 1343181 A2 EP1343181 A2 EP 1343181A2 EP 03005277 A EP03005277 A EP 03005277A EP 03005277 A EP03005277 A EP 03005277A EP 1343181 A2 EP1343181 A2 EP 1343181A2
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EP
European Patent Office
Prior art keywords
scale
head
magnet
magnetizing
magnetizing head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03005277A
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German (de)
English (en)
Inventor
Klaus-Manfred Steinich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASM Automation Sensorik Messtechnik GmbH
Original Assignee
ASM Automation Sensorik Messtechnik GmbH
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Filing date
Publication date
Application filed by ASM Automation Sensorik Messtechnik GmbH filed Critical ASM Automation Sensorik Messtechnik GmbH
Publication of EP1343181A2 publication Critical patent/EP1343181A2/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0273—Imparting anisotropy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets

Definitions

  • the invention relates to a magnetic measuring standard with sections alternately magnetized in the longitudinal direction, hereinafter referred to as "scale", for a length measuring device and a method for its production.
  • a length measuring device Arranged on the circumference of a cylinder, such a length measuring device can of course in principle also be used for angle measurement.
  • the length measuring device comprises on the one hand a scale on which the length units are plotted, and a sensor unit which is moved in the measuring direction relative to the scale.
  • a scale on which the length units are plotted
  • a sensor unit which is moved in the measuring direction relative to the scale.
  • the straight or curved scale has encodings, mostly uniform and periodic encodings, only in a single track or in a plurality of tracks side by side, in the measurement direction one behind the other, the pitch distance being different from track to track.
  • encodings mostly uniform and periodic encodings, only in a single track or in a plurality of tracks side by side, in the measurement direction one behind the other, the pitch distance being different from track to track.
  • the measuring section usually usually only at a single longitudinal position, there is a reference mark, the position of which represents the absolute zero position, and which must therefore first be passed over for starting up the device in order to specify an absolute start value.
  • absolutely measuring length measuring devices are also known.
  • the absolute position of the sensor on the scale can be determined directly, without relative displacement of the sensor compared to the scale and without first having to approach a reference point on the scale ,
  • the measuring device comprises one or more or a large number of magnets which effect the modulation of the signal to be detected.
  • the individual units of length in the form of different magnets or magnetizations are plotted one after the other in the measuring direction on the scale, for example as segments of alternately long polarity in the measuring direction.
  • the sensor unit moved relative to it in the measuring direction which usually already contains at least parts of the evaluation electronics in addition to the actual sensor, detects the constantly changing magnetic field in the measuring direction as an analog signal in the form of a sinusoidal oscillation or a sinusoidal, but uniform, oscillation.
  • a major advantage of this method is the fact that the sensor can be guided to the scale at a distance, i.e. without contact. The scale and the sensor are therefore not subject to mechanical wear.
  • the parallelism of the guidance of the sensor to the direction of the scale must only be given to a limited extent.
  • the distance between the sensor and the scale which should be around 1.0 mm, may also change somewhat.
  • the scale can have one or more tracks arranged side by side, each of which has the alternately polarized magnetized segments.
  • one track can be equipped as a pure counting track with regular sequences of magnetizations, while the other track is used to apply reference marks, either at specific points or in certain areas, ie reference marks for the purpose of marking e.g. B. the absolute zero point, the end of the scale or the like.
  • reference marks either at specific points or in certain areas, ie reference marks for the purpose of marking e.g. B. the absolute zero point, the end of the scale or the like.
  • Such a reference track can be unmagnetized in the length range between the reference marks or additionally be magnetized regularly.
  • absolute encoding of the material measure can be carried out by means of a plurality of tracks lying next to one another, the length of the differently polarized magnetized segments on the individual tracks then mostly being of different lengths.
  • both the regular sequences of magnetizations for registering a distance traveled and at least one irregular sequence of magnetizations for producing reference marks are present on the same track.
  • the width of the track in the area of the irregular sequences can also be divided into two narrow partial tracks.
  • the problem here is to magnetize the scale alternately, regularly and irregularly with as little unwanted leakage flux as possible during magnetization, in order to achieve the most harmonic and as precise as possible sinusoidal electrical signal when later detecting the alternating magnetic segments of the scale.
  • a sensor which is at a certain distance above the surface of the measuring standard, which has the differently polarized magnetized segments, in its longitudinal direction runs along, the inclination, i.e. the first derivative, detects the magnetic field lines which run in a U-shape from each pole to the respectively adjacent poles, and in doing so emerge or enter with their free ends from the surface of the material measure. Accordingly, an electrical signal is generated which is sinusoidal with a zero crossing or a reversal of the curvature of the sinusoidal curve at the boundaries between two differently polarized magnetic segments.
  • the object according to the invention was to provide a method and a device for producing a magnetic scale which, despite the simple and inexpensive construction and implementation of the method, meet the stated properties of the electrical scale.
  • the magnetizing head which acts as a flux guide and in its course the effective at one point Magnets, a permanent magnet or an excitable, in particular electrically excitable, magnet, the tape to be magnetized in the gap (air gap) of the z.
  • the magnetic induction can be changed into or through the scale by - mechanical or electrical - influencing the magnet of the magnetizing head, even without having to remove the magnetizing head from the scale.
  • a system for magnetizing such scales comprises at least one magnetizing head for magnetizing the scale and first and second moving units, the first of which moves the scale in the longitudinal direction and the second the magnetizing head or a part of the magnetizing head to change the magnetic flux.
  • the second movement unit can thus shift or twist the magnet relative to the movement head, but can also mechanically shift parts of the rest of the magnetization head, which act as flux guide pieces, in particular lift them off the scale to be magnetized by swiveling etc.
  • the second movement unit can instead also Shift the entire magnetizing head in a direction transverse to the longitudinal direction of the scale, i.e. lift it off the top of the scale or move it in the transverse direction, parallel to the direction of the surface, away from the scale.
  • the first and second movement units can each attack on the magnetizing head or its parts and in particular be combined to form a single movement unit.
  • the system for magnetizing can also have a second magnetizing head, so that the regular sequences can be produced with one magnetizing head and the irregular sequences of differently magnetized segments with the other magnetizing head.
  • the magnetizing head for producing the regular sequences can in particular be a magnet wheel that rolls in the longitudinal direction on the scale and has regions with alternately different magnetizations along its circumference.
  • Another system is used for - preferably regular - different magnetization of a scale which, however, must be uniformly premagnetized, in which case the starting state is, for. B. the top of the approximately band-shaped scale always forms a north pole and the bottom a south pole.
  • Such a pre-magnetized scale can be polarized in opposite sections by applying a magnetizing head.
  • a magnetizing head is brought to the corresponding side of the scale, which has the polarity of the opposite side of the scale and therefore generates the opposite polarity there.
  • a cover made of non-magnetizable material is present between the scale and the corresponding magnetization head, the openings only at those points, that is to say generally at every second length section at which the magnetization of the scale is desired.
  • the magnetizing head used can extend over several, in particular a large number, of sections of the scale, and in particular as an annular pole, that is to say with the same polarity over the entire circumference, be formed, which rolls on the surface of the scale.
  • the cover is either arranged stationary on the scale and is moved with it relative to the magnetizing head, or is arranged concentrically around the pole in the case of an annular pole and rolls together with it on the surface of the scale.
  • the scale to be magnetized can first be produced with the regular sequences of differently magnetized segments in the sense of the most cost-effective production possible, and preferably over the entire desired length of the later scale, i.e. in the case of previously cut pieces of the scale, this whole Length, preferably in the form of an endlessly produced, continuously alternating magnetized tape.
  • the magnetization is preferably also carried out in a continuous process, preferably by unrolling a magnet wheel, which is faster than the discontinuous, section-by-section manufacture of the individual segments by means of magnetization, although the latter can possibly result in better quality of the magnetization of the individual segments.
  • the irregular sequences of segments are then applied, either on previously non-magnetized areas of the scale, or preferably by remagnetizing the regular markings previously present in these length areas.
  • the latter is particularly preferable if the irregularly marked areas do not extend across the entire track width, but only over a partial track in the transverse direction.
  • the irregular sequences are preferably not applied by rolling off a magnet wheel, but rather by placing a magnetizing head from above onto the top of the scale or by pushing it on in the transverse direction a C-shaped magnetization head at the appropriate longitudinal position on the scale to carry out the magnetization.
  • the magnetic flux into the scale which magnetizes or remagnetizes it in the desired manner in a segment, should preferably only start when the magnetizing head is in the desired position relative to the scale.
  • the magnetic flux can also be applied instead of the transverse displacement of the magnetization head other way:
  • the magnet acting in the magnetizing head is a magnet that is externally excited, in particular electrically excited, the excitation of which can be switched off briefly when the relative position of the magnetizing head is changed.
  • the other possibility is to change the position of the effective magnet within the magnetizing head, which is preferably accommodated in the connecting middle leg in the case of a C-shaped magnetizing head, in such a way that there is no longer any magnetic flux in the magnetizing head, i.e. the magnets either from their aligned position to move away in the magnetizing head or at least to pivot it so that the actual pole direction of this magnet no longer coincides with its target pole direction, which is generally the direction of the leg carrying the magnet, but in particular differs by 90 °.
  • the magnetization head in the form of an 8, that is to say with three connecting legs. If the magnet of the magnetizing head is arranged in one leg, another connecting leg If the gap (air gap) for passing the scale has, the remaining third leg can be equipped with a removable central area. If the third leg and also its removable area acts as a flow guide, that is to say it consists of a material that can be magnetized well, the function of this third leg as a flow guide can be activated and deactivated by removing and moving it back.
  • the ring of the magnetic flux lines is realized from the magnet via the third leg and back to the magnet.
  • the ring When the flow guide in the third connecting leg is deactivated, the ring is realized by a magnet, a scale in the air gap and back to the magnet, so there is a strong magnetic induction in the air gap and thus in the section of the scale arranged there.
  • the scale can be cut to the desired length either before or after the application of the irregular sequences of magnetized segments.
  • a particularly preferred embodiment of a magnetization system would therefore first of all equip an endlessly fed tape by means of a first magnetizing head in the form of a pole wheel in a continuous process with a regular, continuous sequence of magnetized segments, which then pass from a second, discontinuously operating magnetizing head to the in the direction of the tape desired longitudinal positions are equipped with the irregular sequences of segments by means of magnetic reversal and then cut to length at the necessary points.
  • Fig. 1a shows the schematic diagram of a measuring device, consisting of a scale 1 running in the longitudinal direction 10, which the successive, regularly or irregularly arranged in the longitudinal direction 10, alternately, so z. B. on the top a north pole following a south pole, has magnetized segments 27a, b, as shown in FIG. 5, the magnetization axis of the segments being perpendicular, that is to say transverse to the longitudinal direction 10.
  • the scale 1 should enable position detection at least along the length L1 and, in the exemplary embodiment according to FIG. 1a, special markings in the form of tape end marks 32-z. B. in the form of irregular magnetic sequences.
  • the sensor unit 2 comprises, for example in the longitudinal direction in the middle, a sensor 102 for counting the regularly following segments 27a, b,... In the length range L1 and thus the progress in the direction of movement, and additionally in the running direction in front of and behind the sensor 102 special sensors 102 '. which are designed for the detection of the tape end markings 32.
  • the signals determined by the sensor unit 2 are, for. B. passed on via a cable 8 to an evaluation unit, not shown, which - starting from an absolute marking such as the tape end marking 32 - the segments 27a, b, ... overrun by the sensor unit 2 and thus the current position of the sensor unit 2 in the longitudinal direction with respect to scale 1.
  • FIG. 2a shows a magnetization system with a magnetization head 52 with which a single segment 27a, b of the magnetizable scale 1 can be magnetized in the desired manner, that is to say with a north or south pole pointing upwards, B. detectable on the top of the magnetizable layer 1a.
  • the magnetizing head 52 is C-shaped, with a magnet 53 in its connecting middle leg 52a, the pole direction of which, ie the direction running from the north to the south pole, corresponds to the running direction of this leg in the deactivated state.
  • the rest of the magnetization head 52 essentially consists of appropriately shaped flux guide pieces, that is to say a material which conducts the magnetic flux very well.
  • the gap between the opposing free ends 52c of this magnetizing head is just large enough to measure the scale to be magnetized 1, which has a defined, constant thickness, to be able to run relatively along in between in the longitudinal direction 10.
  • This relative movement in the longitudinal direction 10 is realized in the embodiment according to FIG. 2a by a first movement unit 60 which acts on the scale 1.
  • the magnetizing head 52 is stationary.
  • the magnetic flux is interrupted by the gap between the free ends 52c of the magnetizing head 52 before the shift from one segment to the next by activating the magnet 53 with it the corresponding leg 52a of the magnetization head 52 aligned, the polar direction is rotated 90 ° therefrom, then the relative displacement is carried out in the longitudinal direction 10 and then the magnet 53 is again rotated 90 ° to the aligned position or rotated further in the next segment depending on the desired polar direction.
  • An alternative to pivoting or rotating the magnet 53 by means of such a second movement unit 61 is to move the magnet, e.g. B. in the longitudinal direction 10 out of the plane of the leg 52a, which is indicated by the second movement unit 61 '.
  • FIG. 2b shows a perspective view and FIG. 3a in the longitudinal direction 10 shows a further solution for interrupting the magnetic flux between the free ends 52c through the scale 1:
  • the magnet 53 'z. B. fixed in the magnetizing head 52, and for deactivation, the entire magnetizing head 52 - if it is C-shaped, and thus from above and from below close to the scale 1 - transversely to the longitudinal direction 10 in the direction of the transverse extent of the top of the scale 1 subtracted from this, that is, the scale 1 moved out of the effective range of the magnetizing head 52 (arrow 1), then the scale 1 shifted in the longitudinal direction 10 (arrow 2) and then the head 52 moved back (3).
  • a flux guide 54, 55 is arranged laterally next to the scale 1, at least on the side to which the magnetizing head 52 is pulled, by means of which the magnetic flux is passed from one free end 52c to the other with minimal scattering.
  • the flux guide 55 is spaced from the scale 1 during the magnetization, and is only moved laterally to the scale 1 again before the magnetization head 52 moves away from the scale 1.
  • first movement unit 60 for the relative movement in the longitudinal direction 10 between the scale 1 and the magnetization head 52 to let this magnetization head attack, since this opens up the possibility of combining first and second movement units 60, 61 "in a single movement unit, ie not moving one of the two components (scale 1 or magnetization head 52) and only the other component both movements, thus both in the longitudinal direction and in the transverse direction, to be carried out one after the other.
  • FIG. 3a As the sectional view transverse to the longitudinal direction 10 of FIG. 2b, which is shown in FIG. 3a and separately in FIG. 3e, shows the scale 1 next to the magnetizable layer 1a z. B. be supplemented on the underside by a yoke band 1b made of magnetically highly conductive material, through which the inference for the magnetic flux is produced by the magnetizable layer 1a.
  • the magnet 53 can instead also be designed to be movable out of the corresponding leg, as a rule the connecting leg 52a.
  • Fig. 3c further shows a device similar to that of Fig. 3a, with the difference that the magnetizing head 52 is rather U-shaped instead of C-shaped, that is, strive from the connecting leg 52a from two freely projecting, parallel legs 52b.
  • the mutually directed parallel surfaces of these cantilevered legs 52b form between them the air gap into which scale 1 can again be introduced for magnetization.
  • these two cantilevered legs 52b - as shown in Fig. 3d - are equipped with a cross section that tapers towards the air gap, while in the previously described C-shape of the magnetizing head 52 such a tapering of the free ends 52c, preferably viewed in the longitudinal direction 10, was provided for the same reason.
  • the entire magnetization head 52 can in turn be moved back and forth relative to the scale 1 and transversely to its longitudinal direction 10 in accordance with the arrows 1 and 3.
  • the magnetizing head 52 also houses the magnet in the connecting leg 52a of the U-shape, but these are two magnets 53a, 53b which are arranged symmetrically on both sides of the center of the connecting leg with the north and south poles opposite one another. If the connecting leg 52a can be pivoted with these magnets about the axis of symmetry of the U-shape of the head 52, the magnetic can be caused by such a pivoting Flow in the air gap between the free ends 52c are also interrupted.
  • 3f shows a further design of a magnetizing head 52 'in the form of an "eight", that is to say with three connecting legs 52'a, b, c.
  • the connecting legs preferably in an external connecting leg 52'c, there is an interruption in the form of an air gap, into which scale 1 can again be introduced for the purpose of magnetizing.
  • a magnet 53 is arranged in one of the other connecting legs, for example the opposite one, that is to say a connecting leg 52'a.
  • an intermediate piece 66 is arranged as a flow guide, preferably therefore consisting of steel. This intermediate piece 66 can be pivoted about its transverse axis from the aligned position in the longitudinal extension within the connecting leg 52b or can also be moved completely out of the magnetizing head 52 'in the transverse direction, whereby the magnetic flux through this connecting leg 52'b is interrupted.
  • the intermediate piece 66 is moved out of the head 52 'or rotated, the magnetic flux from the magnet 53 will run over the leg with the air gap and thus through the scale 1 located there, that is to say magnetization of the scale 1 will take place.
  • 3b shows a side view of the magnetization by means of a magnetizing head 52 'which is only placed on the scale 1 from above, but in the longitudinal direction one after the other several, each with respect to their pole direction z.
  • B Alternating, magnets 53 ".
  • the magnetization of the scale 1 is carried out by placing the magnetization head 52 'from above, then lifting, longitudinal displacement in the direction 10 between the magnetization head 52' and scale 1 by the length of the magnets 53" contained therein, and again Put on the magnetizing head 52 ', which for a regularly changing sequence of segments with reversed polarization, preferably includes an even number of magnets 53 ".
  • a transverse movement in the plane of the band is not necessary because the magnetizing head 52 'does not engage from below.
  • magnetization heads which enable the production of an endless, regularly alternating magnetization of segments.
  • pole wheels ie wheels rolling on or off the top of the scale 1 with or without spacing, which are differently polarized along their circumference.
  • FIG. 4a shows a pole wheel with a round outer contour with the result that the entire length of a circumferential segment never lies simultaneously intimately on the top of the scale
  • Fig. 4b shows a pole wheel with a polygonal outer circumference, each of the straight circumferential segments of the polygon represents a uniformly magnetized peripheral segment 51 '.
  • a periodically changing distance between the center of the rotor 50 and the top of the scale is then to maintain a uniform distance between the pole wheel 56 and the top of the scale 1 or to rest the outer peripheral surfaces of the pole wheel 56 on the scale Scale 1 to be considered.
  • the spacer tape 1c can be made of a material of defined and very exactly constant thickness, which enables exact adherence to the always the same distance values between the magnetizing head and the magnetizable layer 1a, simply by placing it on the upper side of the spacer tape 1c.
  • the magnet wheel consists of a sleeve-shaped ring magnet 67, the outer circumference of which, for example, represents its south pole 67a and the inside of which represents its north pole 67b, as shown in the upper magnet wheel of FIG. 4c.
  • a ring hunt 68 made of z. B. steel or other material which opposes the lowest possible resistance to the magnetic flux, arranged.
  • This ring shunt 68 has on its outer circumference in the circumferential direction alternately projections 56a and depressions 56b, the length of which in the circumferential direction determines the length of the different magnetizations generated there after rolling on the scale 1.
  • the upper pole wheel has on its outer circumference a polarization as the south pole corresponding to the outer circumference of the ring magnet 67, such a pole wheel is rolled on the top of a scale 1 in its longitudinal direction, which is preferably continuously magnetized so that the top has so far been the north pole and the bottom represents the South Pole.
  • a lower magnet wheel 56 is used simultaneously and synchronously in the opposite direction to the upper magnet wheel 56 ', which has the opposite polarity to the upper magnet wheel 56', ie a ring magnet 67, the outer circumference 67a of which is polarized as the north pole, and similarly also the rotatable ring shunt 68 arranged thereon.
  • the two magnet wheels are thus preferably mechanically identical and differ only in their polarity.
  • the synchronous rotation of the magnet wheels in the opposite direction is preferably ensured by a mechanical gear.
  • the pole wheels 56 ', 56 roll, preferably in contact, on the top or bottom of the scale 1.
  • the ring magnets 67 of the two pole wheels 56 ', 56 "each rotate on an axis 156, 156', both axes being connected to one another at at least one, preferably at both of their free ends a transverse yoke 157, 157 '.
  • Axes 156, 156' and transverse yoke 157, 157 ' act as flux guide pieces and are made of the appropriate material, for example steel.
  • FIG. 5 show - in each case the top view of the scale 1 - different magnetization patterns of the scale 1, in addition to regions with regularly alternating north-south polarity of the individual segments 27a, b, and that over the entire width of the scale 1, the creation of markings in the form of two partial tracks 57, 58 which are each half as wide by the width on the same scale.
  • 5a shows a version in which, in the area of the two partial tracks 57, 58, one partial track 57 continues the regularly alternating magnetization of the only regular alternating main track present up to that point.
  • segments 27a, b .. of the same length have a magnetization which is just different from that of the partial track 57.
  • 5b and 5c show the same for shorter partial tracks of only three or two segments in length.
  • FIG. 5b1 shows how the partial track 58 can be produced with the marking that is not continuously regular compared to the main track:
  • a magnetizing head 52 - which either comprises only a single segment or a sequence of segments in the longitudinal direction - only has to be pushed in the transverse direction up to the middle of the main track onto the corresponding segment of a partial track via the scale 1 and then the desired one from the remaining one , unaffected part-track deviating, magnetization are applied.
  • Fig. 5d shows a marking in the form of two partial tracks, which is not at the end of a scale 1, but in the central area and additionally has the same sequence of poles in the longitudinal direction on the two partial tracks, but with in Longitudinal direction of different transition point from the North Pole to the South Pole in the different partial tracks.
  • the magnetizations in partial tracks shown in FIG. 5, which are non-uniformly continued compared to the regularly alternating magnetized main track, but which can also extend over the entire width, can be performed by the corresponding sensor 102 'in the sensor unit 2 as an end marking, zero point marking or the like can be detected.
  • FIGS. 6a and 6b show a further magnetization method.
  • an already pre-magnetized tape is preferably designed such that its top side, for. B. is continuously magnetized as the north pole and its underside is used as the south pole.
  • the magnetic reversal in sections to the opposite polarity of this magnetic layer 1a which will later be used as scale 1 and is preferably deposited on one side by a yoke band 1b, takes place according to FIG. 6a in that a magnet 53 with its magnetization axis is aligned with the magnetization axis of the magnetization axis premagnetized layer 1 a is moved in the longitudinal direction 10 along the scale 1.
  • a flux template 64 made of a magnetically highly conductive material, such as steel, in which openings 65 are provided at regular intervals in the longitudinal direction 10 of the scale 1.
  • the magnet 53 is guided as closely as possible over the flow template 64, in particular in contact with it.
  • the flow facilitated by the material of the flow template 64 generates the same polarity in the side of the magnetizable layer 1 a lying against the flow template 64 with which the magnet 53 faces the flow template 64, but only where the material of the flow template 64 is present.
  • the openings 65 on the other hand, if the flow template 64 is of sufficient thickness, the air gap which these openings 65 represent is too large to cause a significant magnetic flux from the magnet 53 into the magnetizable layer 1a. In these areas, if the magnetizable layer is pre-magnetized or if there is no pre-magnetization, the unmagnetized state remains.
  • the solution according to FIG. 6b differs in that, in the same way, instead of moving on one side along the outside of the flow template 64, a magnetizing head according to the above-described figures moves C-shaped, U-shaped etc. along the unit consisting of scale 1 and flow template 64 by filling this air gap in the magnetizing head as much as possible.
  • an analog flow guide template with openings arranged analogously can of course also be arranged on the underside of the scale 1.
  • a ring magnet can also be rolled on the outside and / or underside of this unit provided with a flux template, which then no longer requires alternating elevations and depressions as shown in FIGS. 4c, 4d, so that it it can be an arrangement according to FIGS. 4c, 4d, but without its toothed outer ring shunt 68.
  • the mutual distance between the magnet wheels must then also be reduced accordingly, so that the two ring magnets 67 again roll closely, preferably in contact, on the top and bottom sides of the unit consisting of at least one flux template 64 and a magnetizable layer 1a.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP03005277A 2002-03-08 2003-03-10 Magnétisation des corps de mesure magnétiques Withdrawn EP1343181A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10210326.7A DE10210326B4 (de) 2002-03-08 2002-03-08 Magnetisieren von magnetischen Meßkörpern
DE10210326 2002-03-08

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EP1343181A2 true EP1343181A2 (fr) 2003-09-10

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EP (1) EP1343181A2 (fr)
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