EP0584713A1 - Steuerungsverfahren eines Elektromotors zum Antrieb einer Kreiselpumpe - Google Patents

Steuerungsverfahren eines Elektromotors zum Antrieb einer Kreiselpumpe Download PDF

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Publication number
EP0584713A1
EP0584713A1 EP93113211A EP93113211A EP0584713A1 EP 0584713 A1 EP0584713 A1 EP 0584713A1 EP 93113211 A EP93113211 A EP 93113211A EP 93113211 A EP93113211 A EP 93113211A EP 0584713 A1 EP0584713 A1 EP 0584713A1
Authority
EP
European Patent Office
Prior art keywords
motor
signal
control device
power
control signal
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
Application number
EP93113211A
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English (en)
French (fr)
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EP0584713B1 (de
Inventor
Leif Rasmussen
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.)
T Smedegaard AS
Original Assignee
T Smedegaard AS
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Filing date
Publication date
Priority claimed from DK104192A external-priority patent/DK104192D0/da
Application filed by T Smedegaard AS filed Critical T Smedegaard AS
Publication of EP0584713A1 publication Critical patent/EP0584713A1/de
Application granted granted Critical
Publication of EP0584713B1 publication Critical patent/EP0584713B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine

Definitions

  • the present invention relates to a method according to the preamble of claim 1 for controlling an electric motor driving a centrifugal pump.
  • the diameter ratio D1/D2 is the ratio between the impeller diameters at the fluid inlet to and the fluid outlet from the centrifugal pump.
  • such a motor-pump combination is controlled with a view to producing a constant pressure by measuring the output pressure and increasing the rotational speed of the motor, when the pressure decreases, and decreasing the rotational speed of the motor, when the pressure rises.
  • the pressure is measured by means of a differential pressure sensor, producing one signal when the pressure is too low and another signal when the pressure is too high, and no signal when the pressure is correct. Then, these signals are used for regulating the rotational speed of the motor, thus achieving a substantially constant delivery pressure from the pump.
  • the primary disadvantage with this arrangement is that the differential pressure sensor has a certain hysteresis, so that the regulating function does not occur continously, but in steps, causing a certain variation in the delivery pressure of the pump.
  • the disadvantage referred to above is remedied by proceeding as set forth in the characterizing clause of claim 1, in this manner achieving a more constant delivery pressure with varying fluid flow-through than has been possible with previously known methods, without the use of a differential pressure sensor.
  • a simplification is achieved, as the current measurement is relatively easy to perform, compared to the introduction of the relatively complex installation comprising a differential pressure sensor.
  • the present invention is based on the realization that in a pump-motor combination with a diameter ratio D1/D2 less than 1/2, and in which the delivery pressure of the pump is maintained constant, there exists a unique correlation between the current drawn by the motor and the rotational speed of the motor.
  • the motor is a three-phase asynchronous motor, the rotational speed of which is controlled by means of a frequency converter.
  • the asynchronous motor is replaced by a synchronous motor, which like the asynchronous motor may be constructed with a so-called wet-running rotor, and in which the rotor can be in the form of a permanent-magnet rotor, the characteristic properties of the synchronous motor produce a substantially improved regulating characteristic with the above-mentioned regulating based on the current drawn, and the efficiency is also improved.
  • a frequency converter is used for the regulating function, the usual known starting problems for synchronous motors are easily solved by always letting the frequency converter start with a low frequency, i.e. a kind of "gentle start".
  • the motor can e.g. be a shunt motor for alternating or direct current, and the controlling of the rotational speed can be achieved by controlling a shunt-winding resistance.
  • Fig. 1 shows a motor 2, connected to a supply mains marked RST through a frequency converter 1.
  • the motor 2 drives a centrifugal pump 3, the output pressure of which is monitored by means of a differential pressure sensor 4, in a known manner controlling a servo-motor 5, with which the frequency of the frequency converter 1 is controlled.
  • the differential pressure sensor 4 produces a signal to the servo-motor 5 to increase the frequency of the frequency converter 1, while when the pressure is too high, the differential pressure sensor produces a signal to the servo-motor to decrease the frequency of the frequency converter.
  • the differential pressure sensor 4 has a certain hysteresis, so that the frequency of the frequency converter 1 is held constant within a certain pressure interval about the desired pressure.
  • figure 2 shows a frequency converter 1, a motor 2 and a centrifugal pump 3, but in this case, the frequency of the frequency converter 1 is controlled by means of a control device 7, receiving an electrical measuring signal either I or I', being proportional to the current I drawn by the frequency converter 1 and the current I' drawn by the motor 2 respectively. Based on this signal, the control device 7 produces a frequency-control signal f, that is a function of the measuring signal I.
  • the control device 7 When the current I or the current I' rises, corresponding to an increase in the fluid flow Q through the centrifugal pump 3, the control device 7 will adjust the frequency f of the frequency converter 1 upwardly, so that the increase in the rotational speed of the motor 2 will compensate for the decrease in pressure H, when the fluid flow through the pump 3 increases. With a decreasing current I, the control device 7 will adjust the frequency f for the frequency converter 1 downwardly, so that the decrease in the fluid flow Q corresponding to the decrease in the current I, and the consequent increase in the pressure H, will be compensated by a reduction of the rotational speed of the motor.
  • the method according to the invention may be used in connection with other types of motors 2 with associated power controllers 1, as it is sufficient to have a basic principle, according to which there will be produced an electrical measuring signal I, that is proportional to the current drawn by either the motor or the power-control device, and that this measuring signal I is processed so as to produce a control signal f for the power-control device 1 in such a manner, that the control signal f ensures a substantially constant output pressure from the pump.
  • a dimensioning criterium could be that the pressure at the first consumer be maintained substantially constant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP93113211A 1992-08-21 1993-08-18 Steuerungsverfahren eines Elektromotors zum Antrieb einer Kreiselpumpe Expired - Lifetime EP0584713B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DK104192A DK104192D0 (da) 1992-08-21 1992-08-21 Fremgangsmaade til styring af en elektrisk motor der driver en centrifugalpumpe
DK1041/92 1992-08-21
DK12/93 1993-01-06
DK001293A DK1293A (da) 1992-08-21 1993-01-06 Fremgangsmåde til styring af en elektrisk motor, der driver en centrifugalpumpe

Publications (2)

Publication Number Publication Date
EP0584713A1 true EP0584713A1 (de) 1994-03-02
EP0584713B1 EP0584713B1 (de) 1997-07-16

Family

ID=26063115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93113211A Expired - Lifetime EP0584713B1 (de) 1992-08-21 1993-08-18 Steuerungsverfahren eines Elektromotors zum Antrieb einer Kreiselpumpe

Country Status (4)

Country Link
EP (1) EP0584713B1 (de)
AT (1) ATE155552T1 (de)
DE (1) DE69312183T2 (de)
DK (1) DK1293A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309746A (en) * 1996-02-05 1997-08-06 Nuaire Ltd Fan controller
WO1998004835A1 (de) * 1996-07-29 1998-02-05 Gebr. Becker Gmbh & Co. Verfahren zur regelung eines aggregats und frequenzumrichter
EP0833436A2 (de) * 1996-09-27 1998-04-01 General Electric Company Wechselstrommotorregelung für Hochgeschwindigkeits-Tiefbrunnenpumpen
GB2303227B (en) * 1995-07-11 1999-05-19 Fe Petro Inc Apparatus for a fuel dispensing system
EP0978657A1 (de) * 1997-04-25 2000-02-09 Ebara Corporation Strömungsmaschine
GB2352533A (en) * 1999-07-12 2001-01-31 Danfoss As Method for regulating a delivery variable of a pump
US7176674B2 (en) 2003-09-19 2007-02-13 Vacon Oyj Measurement of energy by means of a frequency converter
JP2007162700A (ja) * 2007-01-31 2007-06-28 Ebara Corp ポンプ装置
EP2246569A3 (de) * 2009-04-21 2011-06-22 ITT Manufacturing Enterprises, Inc. Pumpensteuerung
CN102628436A (zh) * 2011-02-03 2012-08-08 罗伯特·博世有限公司 用于调节借助于调速泵输送的流体的压力的方法
US8425200B2 (en) 2009-04-21 2013-04-23 Xylem IP Holdings LLC. Pump controller
WO2013068016A1 (en) 2011-11-08 2013-05-16 Wärtsilä Svanehøj A/S Correcting speed of pumps
US20180304757A1 (en) * 2017-04-24 2018-10-25 Chargepoint, Inc. Liquid Cooled Charging Cable for Charging Electric Vehicles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946049A1 (de) * 1979-11-15 1981-05-27 Hoechst Ag, 6000 Frankfurt Verfahren zum regeln des durchflusses von kreiselpumpen
EP0226858A1 (de) * 1985-11-30 1987-07-01 WILO GmbH Verfahren zum Regeln der Förderhöhe einer Pumpe
DE3824057A1 (de) * 1988-07-15 1990-01-25 Loewe Pumpenfabrik Gmbh Verfahren zur regelung des betriebes von pumpen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946049A1 (de) * 1979-11-15 1981-05-27 Hoechst Ag, 6000 Frankfurt Verfahren zum regeln des durchflusses von kreiselpumpen
EP0226858A1 (de) * 1985-11-30 1987-07-01 WILO GmbH Verfahren zum Regeln der Förderhöhe einer Pumpe
DE3824057A1 (de) * 1988-07-15 1990-01-25 Loewe Pumpenfabrik Gmbh Verfahren zur regelung des betriebes von pumpen

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6070760A (en) * 1995-07-11 2000-06-06 Fe Petro Inc. Variable speed pump-motor assembly for fuel dispensing system
GB2303227B (en) * 1995-07-11 1999-05-19 Fe Petro Inc Apparatus for a fuel dispensing system
US5934508A (en) * 1995-07-11 1999-08-10 Fe Petro Inc. Variable speed pump-motor assembly for fuel dispensing system
GB2309746B (en) * 1996-02-05 1999-08-18 Nuaire Ltd Fan controller
GB2309746A (en) * 1996-02-05 1997-08-06 Nuaire Ltd Fan controller
WO1998004835A1 (de) * 1996-07-29 1998-02-05 Gebr. Becker Gmbh & Co. Verfahren zur regelung eines aggregats und frequenzumrichter
EP0833436A2 (de) * 1996-09-27 1998-04-01 General Electric Company Wechselstrommotorregelung für Hochgeschwindigkeits-Tiefbrunnenpumpen
EP0833436A3 (de) * 1996-09-27 1998-10-21 General Electric Company Wechselstrommotorregelung für Hochgeschwindigkeits-Tiefbrunnenpumpen
KR100533699B1 (ko) * 1997-04-25 2005-12-05 가부시키가이샤 에바라 세이사꾸쇼 유체기계
EP0978657A4 (de) * 1997-04-25 2002-07-17 Ebara Corp Strömungsmaschine
EP0978657A1 (de) * 1997-04-25 2000-02-09 Ebara Corporation Strömungsmaschine
GB2352533A (en) * 1999-07-12 2001-01-31 Danfoss As Method for regulating a delivery variable of a pump
GB2352533B (en) * 1999-07-12 2003-09-10 Danfoss As Method for regulating a delivery variable of a pump
US7176674B2 (en) 2003-09-19 2007-02-13 Vacon Oyj Measurement of energy by means of a frequency converter
JP2007162700A (ja) * 2007-01-31 2007-06-28 Ebara Corp ポンプ装置
EP2246569A3 (de) * 2009-04-21 2011-06-22 ITT Manufacturing Enterprises, Inc. Pumpensteuerung
US8425200B2 (en) 2009-04-21 2013-04-23 Xylem IP Holdings LLC. Pump controller
CN102628436A (zh) * 2011-02-03 2012-08-08 罗伯特·博世有限公司 用于调节借助于调速泵输送的流体的压力的方法
CN102628436B (zh) * 2011-02-03 2016-12-21 罗伯特·博世有限公司 用于调节借助于调速泵输送的流体的压力的方法
WO2013068016A1 (en) 2011-11-08 2013-05-16 Wärtsilä Svanehøj A/S Correcting speed of pumps
US20180304757A1 (en) * 2017-04-24 2018-10-25 Chargepoint, Inc. Liquid Cooled Charging Cable for Charging Electric Vehicles
US11034253B2 (en) * 2017-04-24 2021-06-15 Chargepoint, Inc. Liquid cooled charging cable for charging electric vehicles
US20210300195A1 (en) * 2017-04-24 2021-09-30 Chargepoint, Inc. Liquid Cooled Charging Cable for Charging Electric Vehicles
US12005796B2 (en) * 2017-04-24 2024-06-11 Chargepoint, Inc. Liquid cooled charging cable for charging electric vehicles

Also Published As

Publication number Publication date
ATE155552T1 (de) 1997-08-15
DK1293A (da) 1994-02-22
EP0584713B1 (de) 1997-07-16
DK1293D0 (da) 1993-01-06
DE69312183T2 (de) 1998-01-08
DE69312183D1 (de) 1997-08-21

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