EP2307866A1 - Dispositif, système et procédé permettant de déterminer une température - Google Patents

Dispositif, système et procédé permettant de déterminer une température

Info

Publication number
EP2307866A1
EP2307866A1 EP08785411A EP08785411A EP2307866A1 EP 2307866 A1 EP2307866 A1 EP 2307866A1 EP 08785411 A EP08785411 A EP 08785411A EP 08785411 A EP08785411 A EP 08785411A EP 2307866 A1 EP2307866 A1 EP 2307866A1
Authority
EP
European Patent Office
Prior art keywords
temperature
resonant circuit
dependent
circuit
inductive coupling
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.)
Ceased
Application number
EP08785411A
Other languages
German (de)
English (en)
Inventor
Martin Meyer
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP2307866A1 publication Critical patent/EP2307866A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/04—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies
    • G01K13/08—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies in rotary movement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/32—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using change of resonant frequency of a crystal

Definitions

  • thermometer In practice, there is often the requirement to determine a temperature of an object. Normally, this can be done for example by means of a thermometer. However, cases also occur in which a temperature determination by conventional means is not readily possible. This applies, for example, to the case where the temperature of a moving object is to be measured. Such a moving object may, for example, be the rotor of an electrical machine. In such a case, known devices and methods for determining temperature have fundamental disadvantages. For example, it is exclusively possible by means of thermopiles or thermal imaging cameras to determine a temperature at a surface of the object. The equally conceivable use of a radio sensor is eliminated at least in the case of high temperatures of the object, since the
  • Electronics corresponding sensors usually only below a maximum temperature, which may for example be in the order of 125 ° C, is functional.
  • the present invention has for its object to provide a usable over a wide temperature range and particularly powerful device for determining a temperature.
  • the device according to the invention is advantageous because it provides the conditions for a particularly insensitive to high temperatures temperature determination. This enables the inductive coupling of the resonant circuit with the
  • Detection device which will usually have comparatively temperature-sensitive electronics, can be arranged at a location at which a corresponding maximum temperature is not exceeded.
  • the electrical resonant circuit can advantageously be constructed only of passive electronic components, which are usually comparatively insensitive to high temperatures.
  • resistors, coils and capacitors are available, which are fully functional even at temperatures well above 125 ° C, that is, for example, at a temperature of 200 0 C, still fully functional.
  • the determination of the temperature takes place in that the generator excites the resonant circuit and the oscillation of the resonant circuit is detected by means of the detection device. Due to the at least one temperature-dependent member of the resonant circuit, it is possible, based on at least one temperature-dependent parameter of the resonant circuit, the temperature of the temperature-dependent Glie- of the determine.
  • the at least one temperature-dependent member of the resonant circuit can be thermally coupled to the object whose temperature is to be determined.
  • the at least one temperature-dependent member can be arranged or mounted both on the surface and in the interior of the object.
  • the device according to the invention both for the continuous determination of a temperature and for the determination of individual, by one or more
  • Temperature thresholds separated temperature ranges can be designed.
  • the respective embodiment essentially depends on the respective requirements and can be adapted to these requirements by means of the selection of at least one corresponding temperature-dependent element of the electrical resonant circuit.
  • the device according to the invention is developed such that the generator is designed to excite the resonant circuit by means of individual oscillation packets.
  • a number of oscillations in particular a plurality of complete sinusoidal oscillations, is understood here to mean a number of oscillations, in particular a number of complete sinusoidal oscillations, which means that a vibration packet generally represents a short signal lasting over several periods, for example
  • It is advantageous to excite the oscillating circuit by means of individual oscillation packages since the oscillations of the electrical resonant circuit can be detected reliably and with high accuracy in the intervals between the individual oscillation pacts.
  • the use of individual oscillation packages also stimulates the oscillation circuit the advantage that only then energy in the oscillating circle needs to be fed when actually a temperature determination is to take place.
  • the inventive device is designed such that the ringing of the resonant circuit after its excitation by means of the respective oscillation packet is detected by the detection device.
  • the oscillation of the resonant circuit of the detection device permanently, that is also in the phase of the excitation of the resonant circuit by the generator can be detected.
  • the device can also be so pronounced that only the ringing of the resonant circuit after its excitation by means of the respective oscillation packet is detected by the detection device.
  • this can bring advantages, since the amplitude range to be detected by the detection device is reduced by an exclusive detection of the ringing of the resonant circuit.
  • a temperature-dependent member of any kind can be used.
  • the at least one temperature-dependent member of the resonant circuit is a temperature switch, a temperature-dependent resistor, a temperature-dependent capacitor and / or a temperature-dependent coil.
  • a temperature switch is a switch whose switching state changes as a function of the temperature.
  • Corresponding temperature switches are known, for example, as a bimetal switch, as a temperature switch with liquid or so-called Dehnstoffarbeitsetti.
  • the design of the at least one temperature-dependent member as a temperature switch is particularly suitable in those cases in which the temperature is to be determined or monitored only with respect to one or more threshold values.
  • This may for example relate to the case that an alarm signal is to be generated in the event that the determined temperature exceeds a maximum value.
  • a corresponding overshoot of the maximum value can indicate, for example, an overload situation to which a reaction can be responded to based on the exceeding of the respective maximum temperature determined by the device.
  • temperature switches with or without at least one resistor connected in series can be provided in the electrical oscillating circuit, so that the change in the temperature-dependent characteristic variable of the oscillating circuit caused when the temperature switch is switched can be selected according to the respective requirements and the respective requirement.
  • a temperature-dependent resistor may, for example, be an NTC or a PTC.
  • Temperature-dependent capacitors that is to say capacitors whose capacitance changes as a function of the temperature, are known, for example, in the form of ceramic capacitors consisting of a ceramic material with a temperature-dependent dielectric constant.
  • the temperature dependence on the one hand be given by the temperature coefficient of the coil wire.
  • the coil has a temperature-dependent element approximately in the form of an adjustable by means of a bimetallic coil core.
  • a coil of the resonant circuit oscillating circuit-side part of the inductive coupling device is advantageous since this minimizes the number of components required and moreover ensures direct coupling of the resonant circuit to the inductive coupling device.
  • an inductive coupling device of any desired embodiment can be used.
  • Corresponding devices are known, for example, by the term "inductive coupler.”
  • an inductive coupling device in the form of a rotary transformer can be used, for example German patent application DE 103 44 055 Al known.
  • the coil is designed as a loop antenna. This is advantageous since a coil designed as a loop antenna is a particularly simple embodiment of a coil of the resonant circuit as a resonant-circuit-side component of the inductive coupling device.
  • the invention further comprises an arrangement for determining a temperature of an object with a device according to the invention or one of the previously described preferred developments of the device according to the invention, wherein at least the at least one temperature-dependent member of the resonant circuit is arranged on or in the object and thermally coupled thereto.
  • the object is movable, in particular rotatable. This is advantageous, since, in particular in the case of moving objects, alternative methods for determining temperature, for example using a wired temperature sensor, are generally not applicable or only connected with considerable other disadvantages or restrictions.
  • the object is the rotor of an electrical machine, that is, an electric motor or a generator.
  • the temperature of the rotor of an electrical machine represents a parameter for the state of the electrical machine which can be used for a control of the electrical machine. This enables, for example, a performance-optimized operation of the electric machine, at the same time avoiding an overload situation.
  • the arrangement according to the invention is configured such that the generator and / or the detection device are spaced from the inductive coupling device at a location with a lower temperature compared to the temperature to be determined.
  • This offers the advantage that temperature-sensitive components can also be used for the generator and / or the detection device, so that it is possible, for example, to dispense with special components which are less sensitive to temperature but usually associated with higher costs.
  • the electrical resonant circuit which consists of nwen passive components can be constructed, and optionally still exposed to the inductive coupling device to be determined, optionally high temperature.
  • the object of the present invention is to provide a method which can be used in a wide temperature range and is particularly efficient for determining a temperature.
  • This object is achieved by a method for determining a temperature at which an electrical resonant circuit having at least one temperature-dependent member is excited by means of an inductive coupling means, the oscillation of the resonant circuit via the inductive coupling device is detected and the temperature based on at least a temperature-dependent characteristic of the resonant circuit is determined.
  • the method according to the invention is configured such that the temperature of an object thermally coupled at least to the at least one temperature-dependent element of the resonant circuit is determined.
  • the inventive method can also be developed such that the temperature of a moving, in particular rotating, object is determined.
  • the temperature of the rotor of an electrical machine is determined.
  • the inventive method is designed such that the resonant circuit is excited by means of individual vibration packets.
  • the ringing of the resonant circuit is detected after its excitation by means of the respective oscillation packet.
  • the inventive method is so pronounced that is used as the at least one temperature-dependent member of the resonant circuit, a temperature switch, a temperature-dependent resistor, a temperature-dependent capacitor and / or a temperature-dependent coil.
  • the method according to the invention is preferably configured in such a way that a coil of the resonant circuit is used as the oscillating-circuit-side component of the inductive coupling device.
  • the damping or the quality or the resonant frequency of the resonant circuit is determined as at least one temperature-dependent parameter of the resonant circuit.
  • the attenuation or its reciprocal, that is the quality, or the resonant frequency of the Oscillating circuit can be determined.
  • a change in the electrical resistance of the resonant circuit leads to a change in the damping and thus also the quality of the resonant circuit.
  • a detuning of the resonant circuit can be effected so that the resonant frequency changes as a function of the temperature.
  • FIG. 2 shows a schematic sketch of a second embodiment of the device according to the invention
  • FIG. 3 shows an exemplary embodiment of a measurement taken at a first temperature by means of a device according to FIG.
  • FIG. 4 shows an exemplary embodiment of a device by means of a device according to FIG. 1 at a second, higher level
  • FIG. 1 shows a schematic sketch of a first exemplary embodiment of the device according to the invention. It is assumed that the temperature of a Visibility in the figure 1, not shown, object to be measured in the form of the rotor of an electric motor. Furthermore, assume that the temperature of the rotor exceeds a threshold of 125 ° C in its operation. This has the consequence that for determining the temperature usual active electronic components are not usable or not reliable functioning. Depending on the components used, this could for example already apply above a temperature of about 85 ° C.
  • the only requirement is to monitor the temperature of the rotor with regard to exceeding a first threshold value T 1 and a larger second threshold value T 2. That is, in the described embodiment, it is sufficient to determine whether the temperature of the rotor at the measured location is smaller than T1, larger than T1, and smaller than T2 or greater T2. In this case, for example, if an excess of T1 is exceeded, a warning signal can be generated and output if T2 is exceeded.
  • an electrical resonant circuit S is provided, which in addition to a coil Ll a capacitor Cl and temperature switch TSl and TS2, which at a temperature of Tl or T2 switch.
  • resistors Rl and R2 are connected in series with the temperature switches TS1 and TS2, so that an additional damping of the resonant circuit S takes place by switching the respective temperature switch TS1, TS2.
  • the electrical resonant circuit S which may be located in a region of comparatively high temperature of, for example, significantly more than 125 ° C. due to the passive components used, is coupled to a generator G and a detection device D via an inductive coupling device K.
  • an inductive coupling device K there is the inductive coupling device K next to the resonant circuit coil Ll from a further coil L2.
  • the electrical oscillatory circuit S which has temperature-dependent members in the form of the temperature switches TS1, TS2, is excited by means of the inductive coupling device K.
  • a switch SW is closed, so that the generator G can make an excitation of the resonant circuit S by means of a vibration packet or a burst. After the excitation of the resonant circuit S, the switch SW is opened again.
  • FIG. 1 is only a schematic representation.
  • the switch SW is part of the generator G.
  • the generator G and the detection device D can be realized as a common component.
  • the detection device D the oscillation of the resonant circuit S is detected via the inductive coupling device K.
  • the ringing of the resonant circuit S after its excitation by means of the respective oscillation packet is preferably detected, that is, the detection device D measures, in particular, at the times at which the switch SW is open and thus simultaneous excitation of the resonant circuit S by the generator G does not take place ,
  • An evaluation of the signal detected by the detection device D that is, the oscillation of the
  • the resonant frequency of the resonant circuit S could be used as a temperature-dependent parameter.
  • the electrical oscillating circuit S could, for example, have a temperature-dependent capacitor. If the temperature dependence of such a capacitor leads to a continuous change of the resonant frequency of the resonant circuit S, thus a continuous determination of the temperature of the rotor of the electric motor is made possible.
  • the at least one temperature-dependent element of the resonant circuit S can thus be selected and dimensioned as a function of the particular circumstances and requirements.
  • FIG. 2 shows a schematic sketch of a second embodiment of the device according to the invention.
  • the only difference here is that switching between the generator G and the detection device D takes place by means of the switch SW, so that switching on the detection device D simultaneously causes the generator G to be switched off.
  • This has the consequence that only the ringing of the resonant circuit S after its excitation by means of a vibration packet by the generator G is detected by the detection device D.
  • the fact that the actual excitation of the resonant circuit S by the generator G is not detected by the detection device D, can result in advantages with respect to the amplitude range of the oscillation of the resonant circuit S to be detected by the detection device D.
  • both the generator G and the detection device D can advantageously be arranged in a region which is cooler compared to the temperature of the rotor.
  • FIG. 3 shows an embodiment of a measurement made by means of the device according to FIG. 1 at a first temperature. Shown here is a measured via the coil L2 of the detection device D voltage U L2 , wherein two measuring cycles are shown. As shown from the Measurements can be seen, the resonant circuit S is first excited by the generator G by means of a burst or a vibration packet to vibrate, whereupon sets a vibration with a substantially constant amplitude. In the case of the measurement shown, the oscillation is also detected by the detection device D during the period of this excitation, that is to say the measurement is based on a device according to the embodiment according to FIG.
  • the amplitude of the oscillation decreases due to the existing comparatively weak damping of the resonant circuit S.
  • the detection device D can now determine, for example from the envelope of the detected signal, a measure of the attenuation and compare the determined attenuation, for example, with reference values or reference ranges. In the embodiment of FIG. 3, this leads to the result that both temperature switches TS1 and TS2 are open, that is to say that the measured temperature T of the rotor of the electric motor is lower than the switching temperature TS1 of the temperature switch TS1. As part of a temperature and condition monitoring of the electric motor, this can now be interpreted, for example, to the effect that the temperature T of the rotor is in a non-critical range.
  • FIG. 4 shows an exemplary embodiment of a measurement carried out by means of the device according to FIG. 1 at a second, higher temperature.
  • the form of representation corresponds to that of FIG. 3.
  • FIG. 3 it can be seen that the ringing of the oscillatory circuit S after initial excitation by a vibration packet is clear is more muted. The reason for this is that, due to a significantly higher temperature of the rotor than in FIG. 3, both temperature switches TS1 and TS2 are closed, so that the electrical oscillatory circuit S is additionally damped by the resistors R1 and R2.
  • Ringing of the resonant circuit S by the detection device D and a corresponding comparison with reference values or reference regions makes it possible for the detection device D to determine that both temperature switches TS1 and TS2 are closed, that is to say that in the region of the temperature switch TS1, TS2 , that is to say in the region of the position of the rotor at or in which the temperature switches TS1, TS2 are arranged, a temperature exists which exceeds the threshold value of the temperature T2.
  • This can now be interpreted as part of a subsequent evaluation, for example, to the effect that the electric motor is in an overload situation, so that, for example, the speed of the rotor should be lowered.
  • the previously described embodiments of the device according to the invention and of the method according to the invention make it possible, in particular, to monitor the temperature even on moving objects or parts in which temperatures occur a common temperature measurement are not accessible.
  • this can be dispensed with the use of special, less temperature-sensitive and usually comparatively expensive components.
  • the described embodiments of the device according to the invention and the method according to the invention are particularly powerful in that they can be flexibly adapted to the respective requirements and circumstances.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

La présente invention concerne un dispositif utilisable dans une large plage de température et particulièrement performant permettant de déterminer une température, qui comporte un circuit oscillant électrique (S) comprenant au moins un organe dépendant de la température (TS1, TS2), un générateur (G) pour exciter le circuit oscillant (S), un dispositif de détection (D) pour détecter l'oscillation du circuit oscillant (S) et pour déterminer la température sur la base d'une grandeur caractéristique du circuit oscillant (S), laquelle dépend de la température, ainsi qu'un dispositif de couplage inductif (K) pour le couplage inductif du circuit oscillant (S) avec le générateur (G) et le dispositif de détection (D). L'invention concerne également un système et un procédé permettant de déterminer une température.
EP08785411A 2008-07-31 2008-07-31 Dispositif, système et procédé permettant de déterminer une température Ceased EP2307866A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/006505 WO2010012296A1 (fr) 2008-07-31 2008-07-31 Dispositif, système et procédé permettant de déterminer une température

Publications (1)

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EP2307866A1 true EP2307866A1 (fr) 2011-04-13

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Application Number Title Priority Date Filing Date
EP08785411A Ceased EP2307866A1 (fr) 2008-07-31 2008-07-31 Dispositif, système et procédé permettant de déterminer une température

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EP (1) EP2307866A1 (fr)
WO (1) WO2010012296A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102539005B (zh) * 2011-12-26 2013-06-05 浙江大学 一种基于耦合的非接触式温度测量系统及其测量方法
CA2911050C (fr) 2013-05-03 2021-08-24 3M Innovative Properties Company Systeme de surveillance de la temperature d'un conducteur electrique
CN105806512B (zh) * 2016-03-24 2018-07-20 云南中烟工业有限责任公司 一种接触式测定运动烟草温度的装置
DE102018126713A1 (de) * 2018-10-25 2020-04-30 Ebm-Papst Mulfingen Gmbh & Co. Kg Vorrichtung zum Detektieren eines Temperaturanstiegs bei einem Elektromotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007705A1 (de) * 1980-02-29 1981-09-17 Brown, Boveri & Cie Ag, 6800 Mannheim Geraet zur temperaturueberwachung rotierender bauteile
DE3248034A1 (de) * 1982-12-24 1984-07-05 Hewlett-Packard GmbH, 7030 Böblingen Schaltungsanordnung zur temperaturmessung
DE19510134A1 (de) * 1995-03-21 1996-10-02 Hydrometer Gmbh Schaltungsanordnung zur Messung einer veränderlichen physikalischen Größe, insbesondere der Temperatur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3338100A (en) * 1963-06-12 1967-08-29 Hitachi Ltd Non-contact resonant thermometer
GB9107462D0 (en) * 1991-04-09 1991-05-22 Fluidrive Eng Co Ltd Measuring temperature
JP3707736B2 (ja) * 2003-02-10 2005-10-19 東京瓦斯株式会社 温度センサ、温度情報検出装置および温度情報検出システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007705A1 (de) * 1980-02-29 1981-09-17 Brown, Boveri & Cie Ag, 6800 Mannheim Geraet zur temperaturueberwachung rotierender bauteile
DE3248034A1 (de) * 1982-12-24 1984-07-05 Hewlett-Packard GmbH, 7030 Böblingen Schaltungsanordnung zur temperaturmessung
DE19510134A1 (de) * 1995-03-21 1996-10-02 Hydrometer Gmbh Schaltungsanordnung zur Messung einer veränderlichen physikalischen Größe, insbesondere der Temperatur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2010012296A1 *

Also Published As

Publication number Publication date
WO2010012296A1 (fr) 2010-02-04

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