WO1998026296A1 - Wirbelstrommesswerk für ein zeigerinstrument - Google Patents
Wirbelstrommesswerk für ein zeigerinstrument Download PDFInfo
- Publication number
- WO1998026296A1 WO1998026296A1 PCT/EP1997/006608 EP9706608W WO9826296A1 WO 1998026296 A1 WO1998026296 A1 WO 1998026296A1 EP 9706608 W EP9706608 W EP 9706608W WO 9826296 A1 WO9826296 A1 WO 9826296A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- eddy current
- compensation element
- current measuring
- torque
- temperature
- Prior art date
Links
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
Definitions
- the invention relates to an eddy current measuring device for a pointer instrument, in particular for a tachometer and / or a tachometer, with a rotating magnet arranged on a drive shaft in a rotationally fixed manner, which is opposite an eddy current body made of electrically conductive material and fixed on a pointer shaft, and upon rotation of the drive shaft for transmission of a
- the first torque is formed on the pointer shaft, with a torsion spring which transmits a second torque which is opposite to the first torque on the pointer shaft, with a yoke body arranged behind the eddy current body and / or behind the rotary magnet and with a temperature-dependent compensation element for compensating for a weakening of the magnetic field of the Rotary magnets and a reduction in the conductivity of the eddy current body with increasing temperature.
- Such eddy current measuring devices are used, for example, in tachometers and are therefore known.
- a compensation element in the known eddy current measuring mechanism a compensation ring made of a material is placed over the pole pairs of the rotary magnet, the magnetic resistance of which increases as the temperature rises.
- the magnetic field generated by the rotary magnet is weakened at low temperatures and the weakening is continuously reduced as temperatures rise.
- the invention is based on the problem of designing an eddy current measuring device of the type mentioned at the outset in such a way that it has the smallest possible dimensions and is inexpensive to manufacture.
- the compensation element is designed as a spring element which is designed to reduce the second torque transmitted from the torsion spring to the pointer shaft or to keep the first torque transmitted to the eddy current body constant with increasing temperature.
- a compensation ring to be attached to the rotary magnet is no longer required to compensate for the influence of temperature on the eddy current measuring device.
- the rotary magnet can therefore face the eddy current body with a particularly small distance.
- the rotary magnet can be designed to be particularly small and made from an inexpensive magnetic material.
- the eddy current measuring mechanism therefore has particularly small dimensions and is inexpensive to manufacture.
- the invention can of course also be implemented if the permanent magnet on the pointer shaft and the eddy current body on the drive shaft are provided in a kinematic reversal of the conditions.
- the eddy current measuring mechanism consists of a particularly few components if the torsion spring for the construction as a compensation element is made of a material that reduces its spring constant with increasing temperature. Since the torsion spring for generating the second torque is already no additional component is required for the compensation element.
- the air gap is automatically set by the compensation element if the compensation element is designed as an axial spring to reduce the axial distance between the eddy current body and the rotary magnet when the temperature rises.
- the invention can also be implemented in that the compensation element is designed as an axial spring to reduce the axial distance between the yoke body and the eddy current body or the rotary magnet when the temperature rises.
- This design does not contribute to increasing the dimensions of the eddy current measuring mechanism, since, thanks to the invention, a particularly small rotary magnet is used, which is opposite the eddy current body with a particularly small distance.
- a compensation element according to the invention which fully compensates for the temperature response, can only be implemented with disproportionately great effort, it is advantageous to use a compensation element which does not exactly compensate for the temperature response and to implement the missing compensation using known means. If the compensation element carries out the compensation only incompletely, in the case of undercompensation, the missing compensation can advantageously also be achieved in the working air gap using known compensation materials. If a compensation element overcompensates, a compensation can advantageously be obtained by introducing compensation material, such as FeNi alloys. tion can be achieved, which realizes a temperature-neutral measuring unit together with the compensation element.
- the compensation element can be designed in almost any way and is particularly cost-effective if, according to another advantageous development of the invention, it is made of plastic by injection molding.
- the compensation element compensates for this change over a particularly large temperature interval if it is made of a plastic with a corresponding temperature behavior, e.g. Polyoxymethylene.
- the compensation element made of plastic has sufficient strength and a low tendency to buckle even at high temperatures if it is fiber-reinforced according to another advantageous development of the invention.
- Inserts made of glass fibers are suitable for fiber reinforcement, for example.
- Spring elements often have a spring constant that can only be changed linearly over a limited temperature range. This temperature range can be easily increased if the spring element has a plurality of sections arranged one behind the other and changing their spring constant with different temperatures. It contributes to a further reduction in the costs of manufacturing the eddy current measuring mechanism if the rotary magnet is made from hard ferrite in accordance with another advantageous development of the invention.
- FIG. 1 shows an eddy current measuring mechanism according to the invention with a torsion spring designed as a compensation element
- FIG. 2 shows an embodiment of the eddy current measuring mechanism according to the invention
- FIG. 3 shows section A from FIG. 2,
- FIG. 4 shows a further embodiment of the eddy current measuring mechanism according to the invention
- Figure 5 shows the embodiment of a possible compensation element.
- FIGS. 1, 2 and 4 each show an eddy current measuring mechanism 2 - 5 arranged in a housing 1 with a connecting piece 7 designed for connecting a flexible shaft 6.
- a rotating magnet 8 made of a permanent magnetic material is set in rotation via the flexible shaft 6 faces an eddy current body 9 at a short distance.
- the eddy current body 9 consists of a material with an electrical conductivity, for example of copper or aluminum, and is rotatably fixed on one relative to the rotating magnet 8 mounted pointer shaft 10 attached.
- a rotation of the rotary magnet 8 generates an eddy current in the eddy current body 9 by means of magnetic induction.
- a first torque is transmitted to the pointer shaft 10, which is greater the faster the rotary magnet 8 rotates relative to the eddy current body 9.
- This first torque is counteracted by a second torque transmitted from a torsion spring 11 to the pointer shaft 10, which torque is greater the further the pointer shaft 10 is deflected.
- a yoke body 12, 13 is arranged on the top of the eddy current body 9 and on the bottom of the rotary magnet 8.
- the torsion spring 11 is shown conically in the drawing. Of course, this can also be a flat spiral spring.
- the torsion spring 11 is designed to form a compensation element 14 from a material which reduces the spring constant of the torsion spring 11 with increasing temperature by the same amount by which the first torque transmitted to the eddy current body 9 drops. This compensates for the temperature dependency of the magnetic material of the rotary magnet 8 and the conductivity of the eddy current body 9.
- Polyoxymethylene for example, is suitable as the material for the torsion spring 11.
- FIG. 2 shows a compensation element 16 designed as an axial spring, which reduces the distance between the rotary magnet 8 and the eddy current body 9 as the temperature rises. Since this distance is decisive for the eddy currents generated in the eddy current body 9, this design compensates for a reduction in the torque transmitted from the rotary magnet 8 to the eddy current body 9 as the temperature rises.
- an axial bearing 16a which is axially displaceable in a bearing bush 16b is provided for low-friction mounting of the pointer shaft 10.
- a compensation element 17 designed as an axial spring is arranged between the rotary magnet 8 and the lower return body 13, which reduces the distance of the rotary magnet 8 from the return body 9 with increasing temperature. Since the eddy currents generated in the eddy current body 9 are stronger, the smaller the distance of the yoke body 13 from the rotary magnet 8, the temperature influences on the eddy current measuring mechanism 5 are thereby compensated.
- the compensation element 15 shown in Figure 5 is made in one piece from plastic by injection molding. In addition to the actual spring element, it also has a web 18 and a locking clip 19. With the help of the locking clip 19, the compensation element can simply be pressed into the housing 1 until it engages and is thus fully assembled. The web 18 then brings about the desired position of the compensation element 15 in the eddy current measuring device according to the invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measuring Volume Flow (AREA)
- Measuring Magnetic Variables (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
- Power Steering Mechanism (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9714020-1A BR9714020A (pt) | 1996-12-12 | 1997-11-27 | Mecanismo de medição de corrente parasita para um instrumento indicador |
JP52614598A JP2001510561A (ja) | 1996-12-12 | 1997-11-27 | 指針計器用の渦電流測定装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19651614A DE19651614B4 (de) | 1996-12-12 | 1996-12-12 | Wirbelstrommeßwerk für ein Zeigerinstrument |
DE19651614.5 | 1996-12-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998026296A1 true WO1998026296A1 (de) | 1998-06-18 |
Family
ID=7814431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/006608 WO1998026296A1 (de) | 1996-12-12 | 1997-11-27 | Wirbelstrommesswerk für ein zeigerinstrument |
Country Status (7)
Country | Link |
---|---|
JP (1) | JP2001510561A (de) |
KR (1) | KR100491154B1 (de) |
CN (1) | CN1120373C (de) |
BR (1) | BR9714020A (de) |
DE (1) | DE19651614B4 (de) |
MY (1) | MY127704A (de) |
WO (1) | WO1998026296A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016119576B4 (de) * | 2016-10-13 | 2020-11-05 | Lorenz Hasenbach GmbH u. Co KG | Fallschutzläufer und Sicherungssystem mit Fallschutzläufer |
DE102016119575B4 (de) * | 2016-10-13 | 2020-11-05 | Lorenz Hasenbach GmbH u. Co KG | Fallschutzläufer und Sicherungssystem mit Fallschutzläufer |
DE102015104455B4 (de) * | 2015-03-25 | 2020-11-19 | Lorenz Hasenbach GmbH u. Co KG | Fallschutzläufer und Sicherungssystem mit einem derartigen Fallschutzläufer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108474655B (zh) * | 2015-12-15 | 2020-08-28 | 天宝公司 | 具有补偿温度变化的光学平台的测量仪器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE258719C (de) * | ||||
DE356364C (de) * | 1922-07-20 | Heinrich Wolfer | Einrichtung zum Ausgleich des Temperaturfehlers bei Wirbelstromtachometern | |
DE1764687A1 (de) * | 1968-07-17 | 1971-10-21 | Krupp Gmbh | Magnetische Bauteile fuer Wirbelstrommesszwecke,insbesondere Tachometer |
DE2232422A1 (de) * | 1972-07-01 | 1974-01-10 | Max Baermann | Wirbelstromtachometer mit temperaturkompensation |
EP0062134A1 (de) * | 1981-04-02 | 1982-10-13 | VDO Adolf Schindling AG | Dauermagnetkörper aus kunststoff-gebundenem Magnetmaterial, Verfahren zu seiner Herstellung sowie Wirbelstromtachometer mit einem solchen Dauermagnetkörper |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE232C (de) * | 1877-07-02 | C. HÄRTUNG, Ingenieur, in Nordhausen | Durch den Regulator beeinflufste Präzisionssteuerung | |
DE356C (de) * | 1877-08-25 | H. SEEGER in Seegerhall | Hyacinthentopf |
-
1996
- 1996-12-12 DE DE19651614A patent/DE19651614B4/de not_active Expired - Fee Related
-
1997
- 1997-11-27 JP JP52614598A patent/JP2001510561A/ja active Pending
- 1997-11-27 BR BR9714020-1A patent/BR9714020A/pt not_active IP Right Cessation
- 1997-11-27 WO PCT/EP1997/006608 patent/WO1998026296A1/de active IP Right Grant
- 1997-11-27 CN CN97180611.XA patent/CN1120373C/zh not_active Expired - Fee Related
- 1997-11-27 KR KR10-1999-7004775A patent/KR100491154B1/ko not_active IP Right Cessation
- 1997-12-11 MY MYPI97005975A patent/MY127704A/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE258719C (de) * | ||||
DE356364C (de) * | 1922-07-20 | Heinrich Wolfer | Einrichtung zum Ausgleich des Temperaturfehlers bei Wirbelstromtachometern | |
DE1764687A1 (de) * | 1968-07-17 | 1971-10-21 | Krupp Gmbh | Magnetische Bauteile fuer Wirbelstrommesszwecke,insbesondere Tachometer |
DE2232422A1 (de) * | 1972-07-01 | 1974-01-10 | Max Baermann | Wirbelstromtachometer mit temperaturkompensation |
EP0062134A1 (de) * | 1981-04-02 | 1982-10-13 | VDO Adolf Schindling AG | Dauermagnetkörper aus kunststoff-gebundenem Magnetmaterial, Verfahren zu seiner Herstellung sowie Wirbelstromtachometer mit einem solchen Dauermagnetkörper |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015104455B4 (de) * | 2015-03-25 | 2020-11-19 | Lorenz Hasenbach GmbH u. Co KG | Fallschutzläufer und Sicherungssystem mit einem derartigen Fallschutzläufer |
DE102016119576B4 (de) * | 2016-10-13 | 2020-11-05 | Lorenz Hasenbach GmbH u. Co KG | Fallschutzläufer und Sicherungssystem mit Fallschutzläufer |
DE102016119575B4 (de) * | 2016-10-13 | 2020-11-05 | Lorenz Hasenbach GmbH u. Co KG | Fallschutzläufer und Sicherungssystem mit Fallschutzläufer |
Also Published As
Publication number | Publication date |
---|---|
BR9714020A (pt) | 2000-05-09 |
KR100491154B1 (ko) | 2005-05-24 |
KR20000057319A (ko) | 2000-09-15 |
DE19651614A1 (de) | 1998-06-18 |
DE19651614B4 (de) | 2005-03-24 |
CN1120373C (zh) | 2003-09-03 |
MY127704A (en) | 2006-12-29 |
CN1240512A (zh) | 2000-01-05 |
JP2001510561A (ja) | 2001-07-31 |
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