EP1172560A2 - Fördervorrichtung mit einem stromgesteuerten Motor - Google Patents
Fördervorrichtung mit einem stromgesteuerten Motor Download PDFInfo
- Publication number
- EP1172560A2 EP1172560A2 EP01116892A EP01116892A EP1172560A2 EP 1172560 A2 EP1172560 A2 EP 1172560A2 EP 01116892 A EP01116892 A EP 01116892A EP 01116892 A EP01116892 A EP 01116892A EP 1172560 A2 EP1172560 A2 EP 1172560A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- current
- stroke
- conveying device
- pump
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0201—Current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/04—Motor parameters of linear electric motors
- F04B2203/0401—Current
Definitions
- the invention relates to a conveyor device according to the preamble of claim 1 specified features.
- Conveyors of this type are typically metering pumps but also compressors or other devices in which a Electric motor via a downstream gearbox an oscillating machine drives.
- Gearbox in the sense of the invention is any implementation the rotary motor movement into the translatory movement the working machine.
- the object of the invention to form a generic conveyor device so that it works with higher efficiency, especially low heat loss generated on the motor side.
- the basic idea of the present invention is to use the electronic Control the current supplied to the motor according to the expected engine load depending on the stroke position of the driven machine to limit.
- the present invention can basically be used with all motor controls Find application where the rotational movement of the motor shaft in a translational movement is implemented and the engine load larger fluctuations due to the system's stroke is subjected, such as in compressors.
- a preferred one and typical application is in a metering pump, which is by means of a Servo or stepper motor is driven and its working machine by a positive displacement pump, in particular a diaphragm or piston pump, is formed.
- a metering pump takes place in the transmission often a reduction, so that according to the stroke position the current limitation provided by the pump is particularly effective since the Motor driven for several revolutions with a low current if necessary can be, as appropriate for the return stroke, for example is.
- the delivery is generated under pressure in the working stroke, whereas the return stroke is used for suction. Because the pressure stroke the engine requires more power than the suction stroke, it is advisable the motor with a smaller current than during the suction stroke to be controlled during the pressure stroke.
- a position transmitter in the area of the working machine for example provided for detecting an end position of the push rod.
- the position transmitter is expediently arranged so that it is a Signal in the middle of the working stroke. This is particularly the case with Use of a diaphragm pump is advisable because it is then reliable can be ensured that the pump immediately after receipt of this Signal is stopped when it is switched off, because then the The pump diaphragm is not preloaded, which increases the service life is increased.
- the motor load depends on the one hand on the stroke position, because For example, in the case of an eccentric drive, the torque load on the motor with changing rotational position, even if the one to be applied Force on the push rod remains the same, but on the other hand also from the Lifting speed. This is zero in the end positions of the machine and the largest due to the drive at about half the stroke. Furthermore becomes higher with dosing pumps during the return stroke Speed worked as during the print stroke. This will be convenient to be taken into account when limiting the current of the motor be, which is why the current limitation also depends on the expected Lifting speed should take place.
- a current limit curve set in this way is then expediently still depending on the The speed at which the pump delivers varies because the motor current at constant engine torque load with increasing speed increases. This increase or decrease is when the current limiting curve is determined expedient to take into account.
- the current limitation is expediently carried out in such a way that it takes place depending on the pressure to be applied by the pump, so that when the pump has to apply high pressure, the Motor is adequately powered and in phases lower Pressure the current is reduced accordingly.
- a corresponding sensor that is expediently arranged in the area of the working machine.
- a force measuring device in the area of the oscillating one is preferred Drive means are provided, for example in the area of the push rod.
- this can be done with a predetermined one Speed can also be determined via the motor current, since the Motor current at least in the middle range of the working stroke at a given one Engine speed the moment applied by the engine and to determine the pressure applied by the pump.
- Vice versa can be controlled via the motor control by limiting the maximum Current also limits the maximum pressure to be applied by the pump to avoid impermissibly high loads on the device or system side to prevent.
- the motor in the following interval with the full current (i.e. without the current limitation according to the invention) and only in again following interval to the previously determined level at which such a speed reduction of the engine just not yet takes place to lower.
- the speed of the Motors which is relatively expensive, can also be done by means of the anyway existing position transmitter. Because if the engine Position in which the position transmitter emits a signal in a predetermined one Time has not reached, then this will be with the full current for so long controlled until the position is reached, then to the previously determined Level to be lowered again.
- the shape and position of the current limiting curve is advantageous in this way dimensioned so that not only the efficiency of the device is increased, but that cavitations are also effective during the suction stroke be prevented.
- a current controlled stepper motor drives a reduction gear an eccentric or cam drive on the output side which has the rotational movement in a translatory movement implements and drives a push rod oscillating, which a diaphragm pump applied.
- the load on the motor depends on the Push rod position and the direction of movement.
- the load increases from zero, has at 90 °, so reaches its maximum on half of the return or suction stroke then at 180 ° again to zero.
- the zero, 180 ° and 360 ° positions mark the end positions of the working machine, i.e. 180 ° the end of the Return stroke or start of the work stroke and 360 ° the end of the work stroke and the beginning of the return stroke (0 °).
- the engine load shown with reference to Fig. 1, that is in the respective Position of the working machine at a given speed from The torque to be applied to the motor essentially corresponds to the curve shape the current required by the motor.
- Fig. 2 The relationship between motor current and motor torque is shown in Fig. 2 illustrated by means of two curves, curve 4 showing a high motor current and curve 5 a lower, constant motor current represent.
- the engine torque is M on the ordinate and on the abscissa the engine speed n plotted.
- the torque curve shown in FIG. 2 is typical for one such stepper motor as used to drive a metering pump becomes.
- Fig. 3 are corresponding to the position of the machine described above 1 shows two current limiting curves 6 and 7.
- the current limiting curve 6 is for the operation of the metering pump low pressure and the current limiting curve 7 for the operation of the Pump designed for high pressure, always at the same motor speed in the working stroke or in the return stroke.
- the two Shows curves these are in the area of the return stroke or suction stroke (0 ° to 180 °), whereas in the pressure stroke or working stroke (180 ° up to 360 °) curve 7 is clearly above curve 6.
- the current limiting curve must be designed higher in this area than at lower pressure.
- this is the difference with the return stroke practically not given, since the engine load essentially is equal to.
- the current limiting curves 6 and 7 shown with reference to FIG. 3 are provided for engine controls in the return stroke of the working machine have a higher speed than in the working stroke. With one The current limiting arrangement can be used simultaneously for this purpose to avoid cavitation in the return or suction stroke. If such a change in speed is not provided, then also the current limiting curves essentially the shape of the one in FIG. 1 have load curve shown by curve 2.
- Fig. 4 three current limiting curves 8, 9 and 10 are shown, which are with constant pressure load during the working stroke, however at different output, d. H. different speed of the Engine result.
- the current limitation curves 8 to 10 differ only in the area of the working stroke (180 ° to 360 °), essentially there in the middle range and only in terms of amount. 4 thus illustrates that with increasing engine speed, i.e. with increasing Flow rate, the current required to operate the motor increases. This also results from the physical relationships, because because of the higher speed, the performance of the engine and thus the delivery capacity of the pump increases.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
- Fig. 1
- die Belastung des Motors über einen Rückhub und nachfolgend einen Arbeitshub einer Membranpumpe,
- Fig. 2
- die Abhängigkeit des Motorstroms von dem aufzubringenden Moment in Abhängigkeit der Drehzahl anhand von zwei Stromkurven,
- Fig. 3
- zwei Strombegrenzungskurven eines Motors in Darstellung nach Fig. 1 für hohen und für niedrigen Druck der Arbeitsmaschine und
- Fig. 4
- drei Strombegrenzungskurven eines Motors in Darstellung nach Fig. 1 für unterschiedliche Geschwindigkeiten des Motors bei gleicher Momentenbelastung.
Claims (13)
- Fördervorrichtung mit einem stromgesteuerten Motor, mit einem diesem nachgeschalteten Getriebe zum Umsetzten der rotatorischen Rotorbewegung in eine translatorische Hubbewegung, mit einer davon angetriebenen oszillierenden Arbeitsmaschine und mit einer elektronischen Steuerung, dadurch gekennzeichnet, dass der dem Motor zugeführte Strom entsprechend der zu erwartenden Motorbelastung in Abhängigkeit der Hubstellung der Arbeitsmaschine begrenzt wird.
- Fördervorrichtung nach Anspruch 1 in Form einer Dosierpumpe, dadurch gekennzeichnet, dass der Motor ein Servo- oder Schrittmotor ist und die Arbeitsmaschine durch eine Verdrängerpumpe gebildet ist.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass dem Motor während des Saughubs ein kleinerer Strom als während des Druckhubs der Pumpe zugeführt wird.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Positionsgeber vorgesehen ist, der die Hubstellung der Arbeitsmaschine, insbesondere der Pumpe, oder eine vergleichbare Position von Getriebe oder Rotor erfasst und dass die Strombegrenzung nach einer vorgegebenen Kurve (8, 9) ausgehend von einer vorbestimmten detektierten Position erfolgt.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Positionsgeber nur einmal pro Arbeitszyklus ein Signal abgibt, vorzugsweise im Mittelbereich eines Arbeitshubs.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Strombegrenzung des Motors auch in Abhängigkeit der zu erwartenden Hubgeschwindigkeit erfolgt.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Strombegrenzung auch in Abhängigkeit des von der Pumpe aufzubringenden Drucks erfolgt.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Mittel zur Erfassung des von der Pumpe aufgebrachten Drucks vorgesehen sind oder dass der von der Pumpe maximal zu erbringende Druck vorgegeben ist.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Kraftmesseinrichtung im Bereich der oszillierenden Antriebsmittel vorgesehen ist.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Ermittlung der Strombegrenzungskurve (8, 9) der dem Motor zugeführte Strom stufenweise solange abgesenkt wird, bis der Motor in seiner Geschwindigkeit unter seinen Sollwert absinkt und die zuvor erfolgte Strombegrenzung die Strombegrenzungskurve zumindest in diesem Punkt nach oben begrenzt.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass anhand der Strombegrenzungskurve der Arbeitsdruck der Pumpe unter Berücksichtigung der Geschwindigkeit erfasst wird.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die stufenweise Absenkung der Strombegrenzungskurve in Intervallen erfolgt, denen jeweils ein Arbeitshub und Rückhub der Arbeitsmaschine entspricht, und dass dann, wenn auf Grund der Stromabsenkung festgestellt wird, dass der Motor seine erwartete Position nicht erreicht hat, der Motor mit dem vollen Strom so lange angesteuert wird, bis er die erwartete Position erreicht hat, wonach die zuvor ermittelte Stufe der Strombegrenzungskurve (8, 9) aktiviert wird.
- Fördervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Strombegrenzungskurve so gewählt wird, das beim Saughub der Pumpe keine Kavitation auftritt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000133992 DE10033992A1 (de) | 2000-07-12 | 2000-07-12 | Fördervorrichtung mit einem stromgesteuerten Motor |
DE10033992 | 2000-07-12 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1172560A2 true EP1172560A2 (de) | 2002-01-16 |
EP1172560A3 EP1172560A3 (de) | 2003-11-26 |
EP1172560B1 EP1172560B1 (de) | 2005-11-09 |
Family
ID=7648744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010116892 Expired - Lifetime EP1172560B1 (de) | 2000-07-12 | 2001-07-11 | Dosierpumpe mit einem stromgesteuerten Motor |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1172560B1 (de) |
DE (2) | DE10033992A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150159646A1 (en) * | 2013-12-05 | 2015-06-11 | Prominent Gmbh | Sensorless disturbance detection in metering pumps with stepping motor |
CN108571441A (zh) * | 2017-03-13 | 2018-09-25 | 罗伯特·博世有限公司 | 用于运行往复电磁泵的方法和计算机程序产品 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4123219A1 (de) * | 1991-07-12 | 1993-01-14 | Adolf Strobl | Feinputz- oder farbpumpe |
EP0574623A1 (de) * | 1991-01-29 | 1993-12-22 | Vickers Incorporated | Kraftübertragung |
DE19623537A1 (de) * | 1996-06-13 | 1997-12-18 | Bwt Wassertechnik Gmbh | Dosierpumpe und Dosierverfahren für Flüssigkeiten |
US5980211A (en) * | 1996-04-22 | 1999-11-09 | Sanyo Electric Co., Ltd. | Circuit arrangement for driving a reciprocating piston in a cylinder of a linear compressor for generating compressed gas with a linear motor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4321014A (en) * | 1979-12-31 | 1982-03-23 | Polaroid Corporation | Constant flow pumping apparatus |
DE4115295A1 (de) * | 1991-05-10 | 1992-11-12 | Telefunken Electronic Gmbh | Schaltungsanordnung zur steuerung und ueberwachung eines laststromes |
JPH07115791A (ja) * | 1993-10-13 | 1995-05-02 | Nippondenso Co Ltd | 電気自動車用制御装置 |
-
2000
- 2000-07-12 DE DE2000133992 patent/DE10033992A1/de not_active Ceased
-
2001
- 2001-07-11 DE DE50107956T patent/DE50107956D1/de not_active Expired - Lifetime
- 2001-07-11 EP EP20010116892 patent/EP1172560B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0574623A1 (de) * | 1991-01-29 | 1993-12-22 | Vickers Incorporated | Kraftübertragung |
DE4123219A1 (de) * | 1991-07-12 | 1993-01-14 | Adolf Strobl | Feinputz- oder farbpumpe |
US5980211A (en) * | 1996-04-22 | 1999-11-09 | Sanyo Electric Co., Ltd. | Circuit arrangement for driving a reciprocating piston in a cylinder of a linear compressor for generating compressed gas with a linear motor |
DE19623537A1 (de) * | 1996-06-13 | 1997-12-18 | Bwt Wassertechnik Gmbh | Dosierpumpe und Dosierverfahren für Flüssigkeiten |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150159646A1 (en) * | 2013-12-05 | 2015-06-11 | Prominent Gmbh | Sensorless disturbance detection in metering pumps with stepping motor |
CN108571441A (zh) * | 2017-03-13 | 2018-09-25 | 罗伯特·博世有限公司 | 用于运行往复电磁泵的方法和计算机程序产品 |
CN108571441B (zh) * | 2017-03-13 | 2021-05-25 | 罗伯特·博世有限公司 | 用于运行往复电磁泵的方法和计算机程序产品 |
Also Published As
Publication number | Publication date |
---|---|
DE10033992A1 (de) | 2002-01-31 |
EP1172560B1 (de) | 2005-11-09 |
EP1172560A3 (de) | 2003-11-26 |
DE50107956D1 (de) | 2005-12-15 |
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