CN1240512A - Eddy current measuring arrangement for an indicating instrument - Google Patents
Eddy current measuring arrangement for an indicating instrument Download PDFInfo
- Publication number
- CN1240512A CN1240512A CN97180611.XA CN97180611A CN1240512A CN 1240512 A CN1240512 A CN 1240512A CN 97180611 A CN97180611 A CN 97180611A CN 1240512 A CN1240512 A CN 1240512A
- Authority
- CN
- China
- Prior art keywords
- eddy current
- compensating element
- rotary magnet
- torque
- turbulence measurement
- 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.)
- Granted
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents
- G01P3/495—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents where the indicating means responds to forces produced by the eddy currents and the generating magnetic field
- G01P3/4956—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents where the indicating means responds to forces produced by the eddy currents and the generating magnetic field with thermal compensation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measuring Volume Flow (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Current Or Voltage (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Measuring Magnetic Variables (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention concerns an eddy current measuring arrangement for an indicating instrument, said arrangement comprising a rotary magnet which is disposed in rotationally rigid manner on a primary shaft and lies opposite an eddy current body which is made of electrically conductive material and is secured in rotationally rigid manner on an indicator shaft , said rotary magnet being designed to transmit a first torque to the indicator shaft when the primary shaft rotates. The arrangement further comprises a torsion spring which transmits to the indicator shaft a second torque acting in the opposite direction to the first torque, a magnetic revere member which is disposed behind the eddy current body and/or behind the rotary magnet, and a temperature-dependent compensation element for compensating an attenuation of the magnetic field of the rotary magnet and a reduction in the conductivity of the eddy current body as the temperature increases. According to the invention, the compensation element takes the form of a spring element which is designed to reduce the second torque transmitted by the torsion spring to the indicator shaft or to maintain constant the first torque transmitted to the eddy current body as the temperature increases.
Description
The present invention relates to the particularly a kind of turbulence measurement mechanism of tachometer gage and/or velocity gauge of pointer instrument.There are a rotary magnet, a torsion spring, a magnetic reverse member and a thermal change compensating element, in this turbulence measurement mechanism.Rotary magnet is configured in above the driving shaft the position of eddy current member with the fixed form that can rotate, and rotary magnet transmits first torque to needle pivot.The fixed form that vortex cell is made rotating by conductive material is fixed on the needle pivot.Torsion spring is given second torque opposite with first torque of needle pivot direction of transfer.The magnetic member that reverses is configured in the downstream of eddy current member and/or the downstream of rotary magnet.The thermal change compensating element, is for the decline with eddy current member conductivity of weakening in compensation rotary magnet magnetic field under the situation about rising in temperature.
This turbulence measurement mechanism for example is applied in the tachometer gage, thereby is prior art.In this turbulence measurement mechanism of prior art, a compensated loop of element by way of compensation is housed on the pole pair of rotary magnet, makes with the material that the rising of temperature increases by magnetic resistance.Like this, weaken under low temperature condition in the magnetic field that rotary magnet produces, and situation about weakening is along with the rising of temperature constantly reduces.
Task of the present invention is to produce described that a kind of turbulence measurement mechanism of this instructions beginning, makes this turbulence measurement mechanism volume as far as possible little, manufactures economical and practical.
The present invention solves this problem by following measures.Compensating element, is made spring element, and body plan gets and can reduce second torque that torsion spring passes to needle pivot when temperature rises, or it is constant to keep first torque that passes to the eddy current member.
This layout makes temperature again need not to use the compensated loop that is fixed on the rotary magnet to the compensation of turbulence measurement mechanism influence.Like this, rotary magnet just can be placed in eddy current member opposite in special little gap, thus the rotary magnet that can adopt especially little, the available economical and practical material of volume to produce.So just can make the volume of turbulence measurement mechanism especially little, and metering mechanism can produce economical and practically.
Certainly, the present invention also can be by being provided with permanent magnet on needle pivot, the eddy current member is set on driving shaft and reverses situation aspect its motion.
According to useful design of the present invention, the parts that turbulence measurement mechanism adopts are few especially, and compensating element, has been made a kind of like this torsion spring, and torsion spring can make the spring constant of described torsion spring reduce when being risen by temperature material is made.Any occasion that will produce second torque generally all adopts this torsion spring, thereby compensating element, does not need other part.
According to another useful design of the present invention, when compensating element, was made the axle spring that is intended to reduce the end play between the vortex cell and rotary magnet under the temperature rising situation, air gap was adjusted automatically by compensating element.
As another kind of alternative plan, compensating element, of the present invention also can be made and be intended to reduce the reverse axle spring of the steering gap between member and eddy current member or the rotary magnet of temperature rising situation magnetic.This configuration also is helpless to reducing of turbulence measurement mechanism volume, has adopted especially little rotary magnet to be placed in eddy current member opposite with minimum spacing thanks to the present invention.
Compensating element, full remuneration temperature response characteristics of the present invention, this can only be with big that disproportionate cost just can reach.With regard to this one side, the compensating element, of employing undercompensation temperature response characteristics, the part of leaking benefit by means of known method compensation still are beneficial to.Under the compensating element, situation that only part compensates, can compensate at air gap place in addition by means of known compensative material in the occasion of undercompensation and leak the part of mending in use, do beneficial like this.Under the situation of compensating element, over-compensation, can adopt the compensative material that for example resembles the FeNi alloy in magnetic is reversed part, to compensate, this compensation with compensating element,, has worked to measure thermoneutrality point.
In fact compensating element, can adopt any form, according to another useful design of the present invention, when adopting plastics to make with injection moulding, economical and practical especially.
Adopt general combination of materials, under the situation of 10 ℃ of temperature rises, the torque that rotary magnet passes to the eddy current member reduces about 4% to 8%.According to another useful design of the present invention, when compensating element, was produced by the suitable plastics that for example resemble polyoxymethylene and so on thermal behavior, the temperature range when compensating this variation was big especially.
According to another useful design of the present invention, when the compensating element, that plastics are made was used fiber reinforcement, even enough intensity is also arranged under the situation of high temperature, and the tendency of distortion was atomic.The filler that the material that is suitable for during with fiber reinforcement has glass fibre for example to make.
The spring constant of spring element often only changes in the temperature range internal linear of certain limit.When a plurality of part arranged in series of spring element and its spring constant are pressed different variation with variation of temperature, be not difficult to enlarge this temperature range.
According to another useful design of the present invention, when rotary magnet is made by the hard ferrite, can further reduce the production cost of turbulence measurement mechanism.
The present invention can have many embodiments.For further specifying ultimate principle of the present invention, four kinds of embodiments wherein have been shown in the accompanying drawing, the following describes these embodiments.In the accompanying drawing,
Fig. 1 shows the present invention and adopts the torsion spring turbulence measurement mechanism of element by way of compensation,
Fig. 2 shows an embodiment of turbulence measurement of the present invention mechanism,
Fig. 3 shows the details of A among Fig. 2,
Fig. 4 shows another embodiment of turbulence measurement of the present invention mechanism;
Fig. 5 shows the embodiment of adoptable compensating element.
Fig. 1, Fig. 2 and Fig. 4 show turbulence measurement mechanism 2～5 respectively, are configured in respectively in the shell 1, and have web member 7 body plans it can be connected with flexible shaft 6.Rotary magnet 8 is made by permanent magnetic material, disposes to such an extent that it can be rotated by flexible shaft 6, and eddy current member 9 is positioned at rotary magnet 8 opposites, the spacing configuration slight at interval with rotary magnet 8.Eddy current member 9 is made by conductive material (for example copper or aluminium), is fixed on the needle pivot 10 with the fixed form that can rotate, and needle pivot 10 changes to be established to such an extent that can rotate with respect to rotary magnet 8.This magnetic induction, rotary magnet 8 produces eddy current with changeing in eddy current member 9, thereby gives needle pivot 10 with first transmission of torque.Rotary magnet 8 rotates soon more with respect to eddy current member 9, and first torque is just big more.This first torque is subjected to the retroaction of second torque.Second torque passes to needle pivot 10 by torsion spring 11 with it, and needle pivot 10 deflections must be big more, and the value of second torque is just big more.Be to improve the magnetic induction effect, disposing magnetic reverse member 12 and 13 above the eddy current member 9 and below the rotary magnet 8 respectively.Among the figure, torsion spring 11 picture tapers.Certainly, also can adopt the flat wound spring in the case.
In turbulence measurement mechanism 2 shown in Figure 1, for constituting compensating element, 14, the decrease of torsion spring 11 spring constants is made with the slippage identical materials that passes to first torque of eddy current member 9, thereby compensated the conductivity of the magnetic material of rotary magnet 8 with variation of temperature and eddy current member 9.Polyoxymethylene for example, is the suitable material of torsion spring 11.
Fig. 2 shows the compensating element, 16 of making axle spring, reduce spacing between rotary magnet 8 and the eddy current member 9 under the situation that temperature rises.Given this spacing is the determinative of the eddy current of generation in the eddy current member 9, thereby the effect of this structure is the decline of torque under temperature rising situation that compensation rotary magnet 8 passes to eddy current member 9.For the purpose of coming into plain view, rotary magnet 8, eddy current member 9 and the magnetic member 12,13 that reverses illustrates with different profile lines respectively.
As can see from Figure 3, cod 16a is arranged on needle pivot 10 and makes between the compensating element, 16 of axle spring, can move axially in bearing liner 16b, and its effect is with little friction force installing needle pivot 10.
Situation as for the mechanism of turbulence measurement shown in Fig. 45, rotary magnet 8 and below magnetic reverse and be provided with compensating element, 17 between the member 13, make axle spring, its effect is to reduce the reverse spacing of member 9 of rotary magnet 8 and magnetic under the situation that temperature rises.Member 13 is more little with this spacing of rotary magnet 8 because magnetic is reversed, and the eddy current that produces in the eddy current member 9 is just big more, thereby has compensated the influence of temperature to turbulence measurement mechanism 5.
Compensating element, 15 a usefulness injection mouldings integral body made of plastic shown in Fig. 5.Except real spring element, also have web 18 and locking folder 19.By means of locking folder 19, compensating element, just can be pressed in the shell 1 simply, till locking, thereby loads onto fully.So web 18 just makes compensating element, 15 be seated in desired position in turbulence measurement of the present invention mechanism.
Claims (10)
1. a kind of turbulence measurement mechanism of pointer instrument, has a rotary magnet, a torsion spring, a magnetic reverse member and a thermal change compensating element,, rotary magnet is configured in above the driving shaft position to the eddy current member with the fixed form that can rotate, body plan gets and can transmit first torque to needle pivot under the situation of drive shaft turns, the eddy current member is made by conductive material, be fixed on the needle pivot with the fixed form that can rotate, torsion spring changes direction of transfer second torque opposite with first torque to pointer, the magnetic member that reverses is configured in the downstream of eddy current member and/or the downstream of rotary magnet, the thermal change compensating element, is for the decline with eddy current member conductivity of weakening in compensation rotary magnet magnetic field under the situation about rising in temperature, it is characterized in that, compensating element, (14-17) is made spring element, this compensating element, can reduce second torque that torsion spring (11) passes to needle pivot (10) under the situation that temperature rises, or it is constant to keep first torque that passes to eddy current member (9).
2. turbulence measurement as claimed in claim 1 mechanism is characterized in that, is body plan compensating element, (14), and the material that can reduce described torsion spring spring constant under the situation that torsion spring (11) is risen by temperature is made.
3. turbulence measurement as claimed in claim 1 mechanism is characterized in that compensating element, (16) is made axle spring, is intended to reduce the end play between the eddy current member (9) and rotary magnet (8) under the situation that temperature rises.
4. turbulence measurement as claimed in claim 1 mechanism is characterized in that compensating element, (17) is made axle spring, is intended to reduce reverse gap between member (12,13) and eddy current member (9) or the rotary magnet (8) of situation magnetic that temperature rises.
5. as the described turbulence measurement of above arbitrary claim mechanism, it is characterized in that, magnetic loop adopts temperature variant first kind of material in working gas gap, adopt temperature variant second kind of material outside working gas gap, thereby reached the purpose of further carrying out magnetic compensation.
6. as the described turbulence measurement of above one of them claim at least mechanism, it is characterized in that compensating element, (14-17) is made with injection moulding with plastics.
7. as the described turbulence measurement of one of above claim mechanism, it is characterized in that compensating element, (14-17) is made by polyoxymethylene.
8. as the described turbulence measurement of above at least one claim mechanism, it is characterized in that compensating element, (14-17) is used fiber reinforcement.
9. as the described turbulence measurement of above at least one claim mechanism, it is characterized in that compensating element, (14-17) has a plurality of part arranged in series, and the spring constant of each several part changes in a different manner with variation of temperature.
10. as the described turbulence measurement of above at least one claim mechanism, it is characterized in that rotary magnet (8) is made by the hard ferrite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19651614.5 | 1996-12-12 | ||
| DE19651614A DE19651614B4 (en) | 1996-12-12 | 1996-12-12 | Wirbelstrommeßwerk for a pointer instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1240512A true CN1240512A (en) | 2000-01-05 |
| CN1120373C CN1120373C (en) | 2003-09-03 |
Family
ID=7814431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97180611.XA Expired - Fee Related CN1120373C (en) | 1996-12-12 | 1997-11-27 | Eddy current measuring arrangement for an indicating instrument |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JP2001510561A (en) |
| KR (1) | KR100491154B1 (en) |
| CN (1) | CN1120373C (en) |
| BR (1) | BR9714020A (en) |
| DE (1) | DE19651614B4 (en) |
| MY (1) | MY127704A (en) |
| WO (1) | WO1998026296A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015104455B4 (en) * | 2015-03-25 | 2020-11-19 | Lorenz Hasenbach GmbH u. Co KG | Fall protection runner and safety system with such a fall protection runner |
| CN108474655B (en) * | 2015-12-15 | 2020-08-28 | 天宝公司 | Measuring instrument with optical platform compensating for temperature variations |
| DE102016119576B4 (en) * | 2016-10-13 | 2020-11-05 | Lorenz Hasenbach GmbH u. Co KG | Fall protection runner and safety system with fall protection runner |
| DE102016119575B4 (en) * | 2016-10-13 | 2020-11-05 | Lorenz Hasenbach GmbH u. Co KG | Fall protection runner and safety system with fall protection runner |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE258719C (en) * | ||||
| DE356364C (en) * | 1922-07-20 | Heinrich Wolfer | Device for compensating the temperature error in eddy current tachometers | |
| DE232C (en) * | 1877-07-02 | C. HÄRTUNG, Ingenieur, in Nordhausen | Precision control influenced by the regulator | |
| DE356C (en) * | 1877-08-25 | H. SEEGER in Seegerhall | Hyacinth pot | |
| DE1764687A1 (en) * | 1968-07-17 | 1971-10-21 | Krupp Gmbh | Magnetic components for eddy current measuring purposes, in particular tachometers |
| DE2232422C2 (en) * | 1972-07-01 | 1984-03-08 | Max 5060 Bergisch Gladbach Baermann | Eddy current tachometer with temp. compensation - has strip-shaped compensation element on magnetic bodys inner wall |
| DE3113234A1 (en) * | 1981-04-02 | 1982-10-21 | Vdo Adolf Schindling Ag, 6000 Frankfurt | PERMANENT MAGNETIC BODY MADE OF PLASTIC-BONDED MAGNETIC MATERIAL, METHOD FOR THE PRODUCTION THEREOF AND VERBY CURRENT TACHOMETER WITH SUCH A PERMANENT MAGNETIC BODY |
-
1996
- 1996-12-12 DE DE19651614A patent/DE19651614B4/en not_active Expired - Fee Related
-
1997
- 1997-11-27 KR KR10-1999-7004775A patent/KR100491154B1/en not_active IP Right Cessation
- 1997-11-27 CN CN97180611.XA patent/CN1120373C/en not_active Expired - Fee Related
- 1997-11-27 BR BR9714020-1A patent/BR9714020A/en not_active IP Right Cessation
- 1997-11-27 JP JP52614598A patent/JP2001510561A/en active Pending
- 1997-11-27 WO PCT/EP1997/006608 patent/WO1998026296A1/en active IP Right Grant
- 1997-12-11 MY MYPI97005975A patent/MY127704A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE19651614A1 (en) | 1998-06-18 |
| MY127704A (en) | 2006-12-29 |
| KR20000057319A (en) | 2000-09-15 |
| BR9714020A (en) | 2000-05-09 |
| WO1998026296A1 (en) | 1998-06-18 |
| KR100491154B1 (en) | 2005-05-24 |
| CN1120373C (en) | 2003-09-03 |
| JP2001510561A (en) | 2001-07-31 |
| DE19651614B4 (en) | 2005-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030903 Termination date: 20091228 |