EP3467307B1 - Réglage de la pression d'un système hydraulique comprenant un moteur électrique - Google Patents
Réglage de la pression d'un système hydraulique comprenant un moteur électrique Download PDFInfo
- Publication number
- EP3467307B1 EP3467307B1 EP17194730.2A EP17194730A EP3467307B1 EP 3467307 B1 EP3467307 B1 EP 3467307B1 EP 17194730 A EP17194730 A EP 17194730A EP 3467307 B1 EP3467307 B1 EP 3467307B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- hydraulic
- drive unit
- electric motor
- torque
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
-
- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
Definitions
- the present disclosure relates to a hydraulic system, and especially to an arrangement of pressure control in the hydraulic system.
- a hydraulic device such as a hydraulic cylinder
- a hydraulic pump driven by an electric motor, in fluid connection via a pipe with a pressure chamber of the hydraulic cylinder.
- the pump may increase the pressure in the pressure chamber, and thereby moving the cylinder piston.
- a pressure valve is arranged on the pipe between the hydraulic pump and the hydraulic cylinder.
- the pressure valve may be controlled to open and thereby release pressure in the pipe and the connected pressure chamber.
- the pressure valve may for instance be controlled to open when the pressure in the pipe reaches a predetermined threshold.
- the pressure in the pressure chamber of the hydraulic cylinder may thereby be controlled using the pressure valve.
- Such system using a pressure valve to control the pressure is however limited in the control of the pressure.
- EP1882534 One solution offering further controlling functions is disclosed in EP1882534 , wherein a pressure sensor is arranged to detect the pressure in the pressure chamber of the hydraulic cylinder. The detected pressure is compared to a predetermined desired pressure, and the motor/pump is controlled to increase or decrease the pressure to reach the desired pressure. Such system is however slow and complicated, which may further affect the accuracy of the pressure control. ⁇ _>
- a hydraulic system comprising a hydraulic device, a hydraulic pump in fluid connection with the hydraulic device, an electric motor arranged to drive the hydraulic pump, and a motor drive unit configured to control the operation of the electric motor.
- the hydraulic system further comprises a control unit configured to provide a desired motor torque value to the motor drive unit.
- the motor drive unit is configured to control the operation of the electric motor to a desired torque based on the desired motor torque value.
- the present invention provides a single control loop in which the control unit may provide a desired motor torque value.
- the desired motor torque value may correspond to a desired pressure value in the hydraulic device.
- the desired motor torque value may be used by the motor drive unit as a reference value toward which the torque of the electric motor may be controlled. This may be controlled by the motor drive unit by controlling the current, torque or other parameters to the electric motor. By controlling the torque of the electric motor, the pressure provided by the hydraulic pump may be controlled. An increased set pressure may provide an increased torque in the electric motor.
- the motor drive unit may increase the current to the electric motor to increase the torque. This may consequently increase the pressure in the hydraulic device following an increased speed of the pump.
- a decreased set pressure may provide a decreased torque in the servo motor.
- the motor drive unit may decrease the current to the servo motor to decrease the torque. This may consequently decrease the pressure in the hydraulic device following a decreased speed of the pump.
- control unit may provide instructions to the motor drive unit to indirectly control the pressure in the hydraulic device by providing a desired motor torque value.
- the motor drive unit may get feedback of the present torque in the electric motor by the present current consumption of the electric motor. This may further provide an indirect feedback of the fluid pressure in the system.
- the control unit may be configured to relate a desired operation of the hydraulic device to a certain motor torque of the electric motor.
- the desired operation of the hydraulic device may be initiated by a manual operation by a user, or by an automatically controlled operation.
- the electric motor may be a servo motor, a reluctance motor or an asynchronous motor.
- the hydraulic device may be a hydraulic cylinder.
- the hydraulic system may be a hydraulic press system.
- the motor drive unit may be synchronized with the electric motor in the present hydraulic system in order to relate the driving of the electric motor to the torque control thereof.
- the control unit may then use the torque value sent to the motor drive unit to achieve a desired pressure and operation of the hydraulic device.
- the hydraulic system may comprise a plurality of hydraulic devices, each pressurized by a hydraulic pump driven by an electric motor, which is controlled by a motor drive unit.
- Each motor drive unit may receive a desired motor torque value from the control unit.
- Each motor drive unit may receive an individually set desired motor torque value from the control unit.
- all motor drive units may receive the same desired motor torque value. In a system comprising more than one hydraulic pump, a more complex pressure control may be possible.
- two or more hydraulic pumps may be provided to together provide an aggregated hydraulic pressure to the hydraulic device.
- all motor drive units may receive the same desired motor torque value to provide all electric motors be operated with the same torque. If all hydraulic pumps are similar, each pump may then also provide similar portions to the total pressure. Alternatively, one hydraulic pump may be desired to provide a larger portion of the aggregated pressure.
- the motor drive unit for that electric motor and pump may thereby receive a different desired motor torque value than the motor drive units for the other pumps.
- the motor drive unit that receives a different desired motor torque value may further receive a desired motor rpm value for the electric motor.
- the rpm of that electric motor may be set together with the torque in order to avoid that the electric motor reverse due to a lower torque value than for the other electric motors.
- the motor drive unit that received the desired motor rpm value may control the electric motor to operate at the desired rpm and with the desired torque.
- the hydraulic pump in direct connection with the electric motor may thereby operate at the same rpm as the electric motor.
- the system may comprise two hydraulic pumps operable in opposite directions to enable a low aggregated pressure without operating a pump at low speed risking damage to the pump and electric motor.
- the motor drive units operating the electric motors driving the pumps may thereby receive different desired motor torque values and/or motor rpm values to achieve a desired aggregated pressure to the hydraulic device.
- a method of controlling pressure in a hydraulic device in a hydraulic system comprises the step of providing a hydraulic pump in fluid connection with the hydraulic device, wherein the hydraulic pump is driven by an electric motor, providing a desired motor torque value to a motor drive unit controlling the operation of the electric motor, and controlling the torque of the electric motor via the motor drive unit to a desired torque based on the desired motor torque value.
- Fig. 1 illustrates a hydraulic system 1 comprising a hydraulic device in the form of a hydraulic cylinder 10.
- the hydraulic cylinder 10 comprises a pressure chamber 12 and a piston 14.
- the pressure in the pressure chamber 12 controls the position and movement of the piston 14.
- the pressure of the pressure chamber 12 is provided by a hydraulic pump 20 in fluid connection with the pressure chamber 12 via a pipe 16.
- the hydraulic pump 20 receives incoming pressure fluid from an incoming pipe 18.
- the pressure fluid is pressurized by the hydraulic pump 20 and supplied to the pipe 16.
- the hydraulic pump 20 is driven by an electric motor 30 via a drive shaft 32.
- the speed of the electric motor 30 controls the speed of the hydraulic pump 20.
- the operation of the electric motor 30 is controlled by a motor drive unit 40.
- the drive unit 40 supplies power to the electric motor 30.
- the drive unit 40 controls the torque of the electric motor 30 by controlling the supplied current, torque or other parameters to the electric motor 30. By monitoring and controlling the current, torque or other parameters supplied to and consumed by the electric motor 30, the torque of the electric motor 30 is controlled.
- the drive unit 40 is communicatively connected to a control unit 50.
- the control unit 50 transmits a desired torque value for the electric motor 30 to the drive unit 40.
- the desired torque value corresponds to a motor torque determined to provide a desired pressure in the pressure chamber 12, and further a desired operation of the hydraulic cylinder 10.
- the control unit 50 is configured to provide a desired torque value that is determined based on a desired operation of the hydraulic cylinder 10. The desired operation is provided either from a manual operation by a user of the hydraulic system 1, or from an automatic operation controlling the hydraulic cylinder 10.
- the performance of the electric motor 30, hydraulic pump 20 together with the hydraulic cylinder 10 may be calibrated to provide a system in which the operation of the hydraulic cylinder 10 can be predetermined based on a specific torque of the electric motor 30.
- the operation of the hydraulic cylinder 10 can be controlled by the control unit 50 by setting a desired torque value for the electric motor 30. No slow continuous feedback of the pressure in the pressure chamber 12 or the pipe 16 is thereby needed during operation of the hydraulic system 1.
- a pressure valve (not shown) can be arranged between the hydraulic pump 20 and the hydraulic cylinder 10, which is configured to release pressure from the pipe 16 when the pressure therein reaches a predetermined threshold. Momentary peaks in the pressure is thereby taken care of by the pressure valve.
- Fig. 2 illustrates a hydraulic press system 1' according to an embodiment, comprising two hydraulic pumps 20a, 20b, each driven by an electric motor 30a, 30b via a shaft 32a, 32b.
- the electric motors 30a, 30b are controlled by a respective drive unit 40a, 40b. Both drive units 40a, 40b receives a desired motor torque value from the control unit 50.
- Each drive unit 40a, 40b control the respective electric motor 30a, 30b based on the received desired motor torque value.
- the received motor torque value and/or motor rpm value may be the same to both drive units 40a, 40b, or individually set by the control unit 50, as discussed above.
- a desired aggregated pressure in the pipe 16 to the hydraulic cylinder 10 can thereby be achieved.
- Fig. 3 illustrates a flow chart of a method 100 according an embodiment of the invention.
- a hydraulic system 1 is provided comprising the hydraulic cylinder 10 in fluid connection with the hydraulic pump 20.
- the hydraulic pump 20 is driven by the electric motor 30, which in turn is controlled by the motor drive unit 40.
- a desired motor torque value is provided 104 to the motor drive unit.
- the motor torque is controlled 106 based on the received desired motor torque value.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Electric Motors In General (AREA)
Claims (12)
- Système hydraulique (1) comprenant
un dispositif hydraulique (10) ;
une pompe hydraulique (20) en communication fluidique avec le dispositif hydraulique ;
un moteur électrique (30) agencé pour entraîner la pompe hydraulique ;
une unité d'entraînement de moteur (40) configurée pour commander le fonctionnement du moteur électrique ;
caractérisé en ce que
le système électrique comprend en outre une unité de commande (50) configurée pour fournir une valeur de couple moteur souhaitée à l'unité d'entraînement de moteur (40), la valeur de couple moteur souhaitée correspondant à une valeur de pression souhaitée dans le dispositif hydraulique (10),
dans lequel l'unité d'entraînement de moteur (40) est configurée pour commander un couple du moteur électrique (30) par un couple souhaité sur la base de la valeur de couple moteur souhaitée, et dans lequel l'unité d'entraînement de moteur (40) reçoit une rétroaction d'un couple actuel dans le moteur électrique par la consommation actuelle du moteur électrique (30). - Système hydraulique selon la revendication 1, dans lequel l'unité de commande (50) est configurée pour fournir la valeur de couple moteur souhaitée sur la base d'un fonctionnement souhaité du dispositif hydraulique (10).
- Système hydraulique selon la revendication 1 ou la revendication 2, dans lequel le système hydraulique comprend une pluralité de pompes hydrauliques (20), chacune étant entraînée au moyen d'un moteur électrique (30) commandé par une unité d'entraînement de moteur (40), dans lequel l'unité de commande est configurée pour fournir une valeur de couple moteur souhaitée à chaque unité d'entraînement de moteur.
- Système hydraulique selon la revendication 3, dans lequel l'unité de commande (50) est configurée pour fournir des valeurs de couple moteur souhaitées similaires à toutes les unités d'entraînement de moteur (40).
- Système hydraulique selon la revendication 3, dans lequel l'unité de commande (50) est configurée pour fournir une valeur de couple moteur souhaitée individuelle à chaque unité d'entraînement de moteur (40).
- Système hydraulique selon la revendication 5, dans lequel l'unité de commande (50) est en outre configurée pour fournir une valeur de régime moteur souhaitée à au moins une unité d'entraînement de moteur (40).
- Procédé (100) de commande de pression dans un dispositif hydraulique (10) dans un système hydraulique (1) selon l'une quelconque des revendications précédentes, le procédé comprenant les étapes consistant à :fournir (102) une pompe hydraulique (20) en connexion fluidique avec le dispositif hydraulique, dans lequel la pompe hydraulique est entraînée au moyen d'un moteur électrique (30),fournir (104) une valeur de couple moteur souhaitée à une unité d'entraînement de moteur(40) commandant le fonctionnement du moteur électrique,commander (106) le couple du moteur électrique (30) par l'intermédiaire de l'unité d'entraînement de moteur à un couple souhaité sur la base de la valeur de couple moteur souhaitée, etrecevoir une rétroaction d'un couple actuel dans le moteur électrique (30) par la consommation actuelle du moteur électrique.
- Procédé selon la revendication 7, dans lequel la valeur de couple moteur souhaitée est fournie sur la base d'un fonctionnement souhaité du dispositif hydraulique (10).
- Procédé selon la revendication 7 ou la revendication 8, dans lequel une pluralité de pompes hydrauliques (20), chacune entraînée par un moteur électrique (30) commandée par une unité d'entraînement de moteur (40), sont fournies, et dans lequel l'étape (104) consistant à fournir une valeur de couple moteur souhaitée comprend l'apport d'une valeur de couple moteur souhaitée à chaque unité d'entraînement de moteur.
- Procédé selon la revendication 9, dans lequel des valeurs de couple moteur souhaitées similaires sont fournies à toutes les unités d'entraînement de moteur (40).
- Procédé selon la revendication 8, dans lequel une valeur de couple moteur souhaitée individuelle est fournie à chaque unité d'entraînement de moteur (40).
- Procédé selon la revendication 11, dans lequel une valeur de régime moteur souhaitée est fournie à au moins une unité d'entraînement de moteur (40).
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES17194730T ES2875355T3 (es) | 2017-10-04 | 2017-10-04 | Control de presión de un sistema hidráulico con motor eléctrico |
PT171947302T PT3467307T (pt) | 2017-10-04 | 2017-10-04 | Controlo de pressão de sistema hidráulico com motor elétrico |
HUE17194730A HUE054669T2 (hu) | 2017-10-04 | 2017-10-04 | Hidraulikus rendszer nyomásszabályozása villanymotorral |
PL17194730T PL3467307T3 (pl) | 2017-10-04 | 2017-10-04 | Sterowanie ciśnieniem układu hydraulicznego z silnikiem elektrycznym |
EP17194730.2A EP3467307B1 (fr) | 2017-10-04 | 2017-10-04 | Réglage de la pression d'un système hydraulique comprenant un moteur électrique |
PCT/EP2018/076907 WO2019068762A1 (fr) | 2017-10-04 | 2018-10-03 | Commande de pression de système hydraulique doté d'un moteur électrique |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17194730.2A EP3467307B1 (fr) | 2017-10-04 | 2017-10-04 | Réglage de la pression d'un système hydraulique comprenant un moteur électrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3467307A1 EP3467307A1 (fr) | 2019-04-10 |
EP3467307B1 true EP3467307B1 (fr) | 2021-04-21 |
Family
ID=60021944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17194730.2A Active EP3467307B1 (fr) | 2017-10-04 | 2017-10-04 | Réglage de la pression d'un système hydraulique comprenant un moteur électrique |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3467307B1 (fr) |
ES (1) | ES2875355T3 (fr) |
HU (1) | HUE054669T2 (fr) |
PL (1) | PL3467307T3 (fr) |
PT (1) | PT3467307T (fr) |
WO (1) | WO2019068762A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2505644B2 (ja) * | 1990-11-20 | 1996-06-12 | 三菱電機株式会社 | 油圧エレベ―タ駆動制御装置 |
JP4576639B2 (ja) | 2005-05-16 | 2010-11-10 | アイダエンジニアリング株式会社 | プレス機械のダイクッション装置 |
DE102011104292A1 (de) * | 2011-06-16 | 2012-12-20 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Steuerung eines Drehmoments eines Elektromotors eines elektrohydraulischen Systems |
US10072676B2 (en) * | 2014-09-23 | 2018-09-11 | Project Phoenix, LLC | System to pump fluid and control thereof |
-
2017
- 2017-10-04 HU HUE17194730A patent/HUE054669T2/hu unknown
- 2017-10-04 PL PL17194730T patent/PL3467307T3/pl unknown
- 2017-10-04 ES ES17194730T patent/ES2875355T3/es active Active
- 2017-10-04 PT PT171947302T patent/PT3467307T/pt unknown
- 2017-10-04 EP EP17194730.2A patent/EP3467307B1/fr active Active
-
2018
- 2018-10-03 WO PCT/EP2018/076907 patent/WO2019068762A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2019068762A1 (fr) | 2019-04-11 |
EP3467307A1 (fr) | 2019-04-10 |
ES2875355T3 (es) | 2021-11-10 |
PT3467307T (pt) | 2021-06-04 |
PL3467307T3 (pl) | 2021-10-25 |
HUE054669T2 (hu) | 2021-09-28 |
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