EP2503155A2 - Pumpvorrichtung und Flüssigkeitsumlaufsystem mit der Vorrichtung - Google Patents

Pumpvorrichtung und Flüssigkeitsumlaufsystem mit der Vorrichtung Download PDF

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Publication number
EP2503155A2
EP2503155A2 EP20120157670 EP12157670A EP2503155A2 EP 2503155 A2 EP2503155 A2 EP 2503155A2 EP 20120157670 EP20120157670 EP 20120157670 EP 12157670 A EP12157670 A EP 12157670A EP 2503155 A2 EP2503155 A2 EP 2503155A2
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EP
European Patent Office
Prior art keywords
duty factor
motor
signal
pipe
pipe resistance
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.)
Withdrawn
Application number
EP20120157670
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English (en)
French (fr)
Inventor
Hidetoshi Ueda
Youichi Syukuri
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.)
Panasonic Corp
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Panasonic Corp
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Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2503155A2 publication Critical patent/EP2503155A2/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • F04D15/0088—Testing machines

Definitions

  • the invention relates to a pumping device and a liquid circulation system with the device.
  • a pipe resistance of the circular channel changes in response to opening or closing of each valve.
  • Japanese Patent Application Publication No. 2004-232607 discloses reading out a current value of a motor for driving a pump as a corresponding value to a change of a flow volume and controlling an output level of the pump in response to a change of the current value.
  • a small motor current is estimated to be a small flow volume, and the output level of the pump is reduced, so that a lifting height of the pump is lowered at a small flow volume. Accordingly, the flow volume can be controlled in response to a pipe resistance changed through an operation of a pipe valve. For this reason, it is possible to suppress an extra pressure loss of the pump, thereby realizing energy saving and downsizing.
  • the device of Document 1 requires a costly arithmetic circuit comprised of a microcomputer and the like, which becomes a redundant design in case each pipe resistance of pipe lines each of which is provided with a pump is known.
  • the present invention is a liquid circulation system, comprising a pump (7) located along a circular channel (L) having a pipe resistance, a motor (4) for driving the pump (7), and a pumping device configured to circulate a liquid through the motor (4).
  • the pumping device comprises a motor controlling unit (3), a sensing unit (1) and a signal generating unit (2).
  • the motor controlling unit (3) is configured to control an operation of the motor (4) by PWM control.
  • the sensing unit (1) is configured to measure (sense) a pipe resistance of the circular channel (L).
  • the signal generating unit (2) is configured to generate a signal of a duty factor, corresponding to the pipe resistance measured with the sensing unit (1), of duty factors respectively corresponding to pipe resistances.
  • the motor controlling unit (3) is configured to control the operation of the motor (4) by PWM control according to the signal of the duty factor generated with the signal generating unit (2).
  • the circular channel (L) is a common channel connected with at least first and second pipe lines (La and Lb) which are connected in parallel with each other.
  • the circular channel (L) has: a first pipe resistance when one of the first and second pipe lines (La and Lb) is opened; or a second pipe resistance when two of the first and second pipe lines (La and Lb) are opened.
  • the signal generating unit (2) has at least first and second range (CRa and CRb) that correspond to the first and second pipe resistances, respectively.
  • the signal generating unit (2) is configured: to supply the motor controlling unit (3) with a signal of a first duty factor (DFa) if the pipe resistance measured with the sensing unit (1) is lower than an upper limit of the first range (CRa); to supply the motor controlling unit (3) with a signal of a second duty factor (DFb) if the pipe resistance measured with the sensing unit (1) is higher than an upper limit of the first range (CRa); and to supply the motor controlling unit (3) with a signal of the first duty factor (DFa) if the pipe resistance measured with the sensing unit (1) becomes lower than a lower limit of the second range (CRb) while supplying the motor controlling unit (3) with a signal of the second duty factor (DFb).
  • DFa first duty factor
  • DFb second duty factor
  • the sensing unit (1) comprises: a current sensing unit (10) configured to sense an electric current through the motor (4); and a current smoothing circuit (5) configured to smooth the electric current sensed with the current sensing unit (10).
  • the signal generating unit (2) is configured to provide the motor controlling unit (3) with the signal of the duty factor through a time-constant circuit (6).
  • the present invention is a pumping device in the liquid circulation system.
  • the operation of the motor is controlled by PWM control according to a duty factor corresponding to a pipe resistance. Accordingly, if the pipe resistance is known, output control of the pump according to a flow volume can be performed by setting a duty factor in a simplified configuration, thereby realizing energy saving and downsizing.
  • FIG. 2 shows a liquid circulation system in accordance with a first embodiment of the present invention.
  • a pump 7 is inserted along a common circular channel L connected with pipe lines La, Lb, Lc and Ld which are connected in parallel with each other.
  • the pipe lines La, Lb, Lc and Ld are also provided with valves Va, Vb, Vc and Vd each of which can be opened and closed individually. Accordingly, the pipe lines La, Lb, Lc and Ld connected to the pump 7 change by opening or closing each of the valves Va, Vb, Vc and Vd, and the pipe resistance of the circular channel L changes as well.
  • the circular channel L has: a first pipe resistance when one of the pipe lines La to Ld is opened through any one of the valves Va to Vd; a second pipe resistance when two of the pipe lines La to Ld are opened through any two of the valves Va to Vd; a third pipe resistance when three of the pipe lines La to Ld are opened through any three of the valves Va to Vd; or a fourth pipe resistance when four of the pipe lines La to Ld are opened through four of the valves Va to Vd.
  • Each of the pipe lines La, Lb, Lc and Ld also has, for example, almost the same pipe resistance.
  • the pipe lines of the present invention may each have pipe resistances different from each other.
  • the valves may be opened or closed by turns, for example, in order from the valve Va to the valve Vd or from the valve Vd to the valve Va.
  • the liquid circulation system includes the pump 7 located along the circular channel L having a variable pipe resistance, a motor 4 for driving the pump 7, and a pumping device configured to circulate a liquid of the liquid circulation system through the motor 4.
  • the pumping device includes a motor controlling unit 3, a sensing unit 1, and a signal generating unit 2.
  • the motor controlling unit 3 is configured to control an operation of the motor 4 by PWM control (mode).
  • the sensing unit 1 is configured to measure (sense) a pipe resistance of the circular channel L.
  • the signal generating unit 2 is configured to generate a signal of a duty factor, corresponding to the pipe resistance measured with the sensing unit 1, of duty factors corresponding to pipe resistances, respectively.
  • the signal generating unit 2 is configured to generate signals corresponding to the duty factors, respectively, and generates a signal corresponding to any one of the duty factors in response to the pipe resistance measured with the sensing unit 1.
  • the motor controlling unit 3 is also configured to control the operation of the motor 4 by PWM control according to the signal of the duty factor generated with the signal generating unit 2.
  • the sensing unit 1 is a pipe resistance sensing unit that includes a current sensing unit 10 for converting an electric current through the motor 4 (a motor current) into a voltage, and is configured to sense the pipe resistance (or a change of the pipe resistance) by sensing the motor current through the current sensing unit 10.
  • the current sensing unit 10 is, for example, a shunt resistance connected in series with the motor 4.
  • the sensing unit 1 also includes an amplifier for amplifying the voltage (corresponding to the pipe resistance) sensed with the current sensing unit 10.
  • the amplifier is comprised of an operational amplifier OP1 and the like. Therefore, the motor current corresponding to the pipe resistance is converted into a voltage with the shunt resistance to be amplified with the amplifier.
  • the amplified voltage is supplied to the signal generating unit 2.
  • the signal generating unit 2 is a duty factor designating unit configured to compare the voltage from the sensing unit 1 with different voltages to produce a signal (a designation voltage) for deciding a duty factor of PWM control.
  • the signal generating unit 2 includes: comparison circuits 21(21a, 21b and 21c); (first, second and third) resistors R1, R2 and R3 of which first ends are connected with the outputs of the comparison circuits 21a, 21b and 21c, respectively; resistors in series (R4 and R5) of which junction is connected with second ends of the resistors R1, R2 and R3; and a power circuit for applying a DC voltage across the resistors R4 and R5.
  • the (first) comparison circuit 21a includes a circuit for deciding an upper limit of a current range CRa (a first range) and a lower limit of a current range CRb (a second range), and is comprised of an operational amplifier OP2, capacitor C1 and a variable voltage divider.
  • An inverting input terminal of the operational amplifier OP2 is connected to the output of the sensing unit 1, and an output terminal of the operational amplifier OP2 is connected to the first end of the resistor R1.
  • the capacitor C1 is connected between a non-inverting input terminal of the operational amplifier OP2 and ground (earth).
  • the variable voltage divider is formed of: resistors in series (R11 and R12) of which junction is connected to the non-inverting input terminal of the operational amplifier OP2; and a switch circuit for changing a division ratio of the variable voltage divider.
  • an end of the resistor R12 is grounded, and a DC voltage of the power circuit is applied across the resistors R11 and R12.
  • the switch circuit includes: a resistor R13 and a switch device (a transistor Tr1) which are connected in series with each other and also connected in parallel with the resistor R12; and a resistor R14 and a diode D1 which are connected in series between a control terminal (a base) of the switch device and the output terminal of the operational amplifier OP2.
  • a cathode of the diode D1 is connected to the output terminal of the operational amplifier OP2.
  • the resistors R11 to R13 define the upper limit of the current range CRa, while the resistors R11 and R12 define the lower limit of the current range CRb.
  • the signal generating unit 2 has the current range CRa and the current range CRb, where the current range CRa corresponds to the first pipe resistance (preferably only the first pipe resistance) and the current range CRb corresponds to the second pipe resistance (preferably only the second pipe resistance).
  • the (second) comparison circuit 21b includes a circuit for deciding an upper limit of the current range CRb and a lower limit of a current range CRc (third range), and is comprised of an operational amplifier OP3, capacitor C2 and a variable voltage divider (R21-R24, Tr2 and D2) in the same way as the comparison circuit 21a.
  • the resistors R21 to R23 define the upper limit of the current range CRb, while the resistors R21 and R22 define the lower limit of the current range CRc.
  • the signal generating unit 2 further has the current range CRc that corresponds to the third pipe resistance (preferably only the third pipe resistance).
  • the (third) comparison circuit 21c includes a circuit for deciding an upper limit of the current range CRc and a lower limit of a current range CRd (fourth range), and is comprised of an operational amplifier OP4, capacitor C3 and a variable voltage divider (R31-R34, Tr3 and D3) in the same way as the comparison circuit 21a.
  • the resistors R31 to R33 define the upper limit of the current range CRc, while the resistors R31 and R32 define the lower limit of the current range CRd.
  • the signal generating unit 2 further has the current range CRd that corresponds to the fourth pipe resistance (preferably only the fourth pipe resistance).
  • the comparison circuit 21a is configured: to supply the motor controlling unit 3 with a signal of a duty factor DFa (a first duty factor) if the output of the sensing unit 1 is lower than the upper limit of the current range CRa; and to supply the motor controlling unit 3 with a signal of a duty factor DFb (a second duty factor) if the output of the sensing unit 1 is equal to or higher than the upper limit of the current range CRa, where the duty factor DFb is larger than the duty factor DFa.
  • a duty factor DFa a first duty factor
  • DFb a second duty factor
  • the comparison circuit 21a is also configured to supply the motor controlling unit 3 with a signal of the duty factor DFa if the output of the sensing unit 1 becomes equal to or lower than the lower limit of the current range CRb while providing the motor controlling unit 3 with a signal of the duty factor DFb.
  • the comparison circuit 21b is configured to supply the motor controlling unit 3 with a signal of a duty factor DFc (a third duty factor) together with the comparison circuit 21a if the output of the sensing unit 1 is equal to or higher than the upper limit of the current range CRb, where the duty factor DFc is larger than the duty factor DFb.
  • a duty factor DFc a third duty factor
  • the comparison circuit 21b is also configured: to allow the comparison circuit 21a to supply the motor controlling unit 3 with a signal of the duty factor DFb if the output of the sensing unit 1 becomes equal to or lower than the lower limit of the current range CRc and higher than the lower limit of the current range CRb while supplying the motor controlling unit 3 with a signal of the duty factor DFc together with the comparison circuit 21a; and to allow the comparison circuit 21a to supply the motor controlling unit 3 with a signal of the duty factor DFa if the output of the sensing unit 1 becomes equal to or lower than the lower limit of the current range CRb while supplying the motor controlling unit 3 with a signal of the duty factor DFc together with the comparison circuit 21a.
  • the comparison circuit 21c is configured to supply the motor controlling unit 3 with a signal of a duty factor DFd (a fourth duty factor) together with the comparison circuits 21a and 21b if the output of the sensing unit 1 is equal to or higher than the upper limit of the current range CRc, where the duty factor DFd is larger than the duty factor DFc.
  • a duty factor DFd a fourth duty factor
  • the comparison circuit 21b is also configured: to allow the comparison circuits 21a and 21b to supply the motor controlling unit 3 with a signal of the duty factor DFc if the output of the sensing unit 1 becomes equal to or lower than the lower limit of the current range CRd and higher than the lower limit of the current range CRc while supplying the motor controlling unit 3 with a signal of the duty factor DFd together with the comparison circuits 21a and 21b; to allow the comparison circuit 21a to supply the motor controlling unit 3 with a signal of the duty factor DFb if the output of the sensing unit 1 becomes equal to or lower than the lower limit of the current range CRd and higher than the lower limit of the current range CRb while supplying the motor controlling unit 3 with a signal of the duty factor DFd together with the comparison circuits 21a and 21b; and to allow the comparison circuit 21a to supply the motor controlling unit 3 with a signal of the duty factor DFa if the output of the sensing unit 1 becomes equal to or lower than the lower limit of the current range CR
  • the motor controlling unit 3 is configured to control an operation of the motor 4 by PWM control according to a duty factor corresponding to a signal (voltage) from the signal generating unit 2. Specifically, the motor controlling unit 3 is configured to control an operation of the motor 4 by PWM control according to a larger duty factor if a signal (voltage) from the signal generating unit 2 becomes lower. Thereby, the motor 4 is driven by the motor controlling unit 3, and the pump 7 is rotated with the motor 4 to circulate a liquid in the circular channel L.
  • each output of the operational amplifiers OP2-OP4 is High, and accordingly each of the resistors R1-R3 is pulled up.
  • a signal of the duty factor DFa (a designation voltage) is obtained from the junction of the resistors R4 and R5 and supplied to the motor controlling unit 3.
  • the motor 4 is driven by PWM control according to a minimum duty factor DFa corresponding to the signal (designation voltage).
  • valve Vb If the valve Vb is then opened, the pipe resistance changes and the output voltage of the operational amplifier OP1 rises. Subsequently, if a value of the motor current reaches the upper limit of the current range CRa shown in FIG. 4 , a voltage of the inverting input terminal of the operational amplifier OP2 exceeds a voltage of its non-inverting input terminal, and the output of the operational amplifier OP2 becomes Low. Thereby, the resistor R1 is pulled down and connected in parallel with the resistor R5. Accordingly, a signal of the duty factor DFb (designation voltage) lower than a signal of the duty factor DFa (designation voltage) is supplied to the motor controlling unit 3, and the motor 4 is driven by PWM control according to the signal of DFb. The pump 7 is operated at the operating point OPb as shown in FIG. 4 .
  • the transistor Tr1 is also turned off, and the resistor R13 is disconnected from GND. Therefore, a voltage of the non-inverting input terminal of the operational amplifier OP2 rises according to a time constant and a division ratio that are decided with the resistors R11, R12 and the capacitor C1.
  • the voltage of the non-inverting input terminal is a threshold that defines the lower limit of the current range CRb.
  • the outputs of the operational amplifiers OP3 and OP4 becomes Low in turn.
  • the resistors R2 and R3 are pulled down in turn, so that the motor controlling unit 3 is, in turn, supplied with a designation voltage of the duty factor DFc lower than a designation voltage of the duty factor DFb and a designation voltage of the duty factor DFd lower than a designation voltage of the duty factor DFc.
  • the motor 4 is driven by PWM control according to the voltage of the duty factor DFc and PWM control according to the voltage of the duty factor DFd in turn.
  • the pump 7 is operated at the operating points OPc and OPd sifted from the operating point OPb in turn.
  • a voltage of the non-inverting input terminal of the operational amplifier OP4 rises according to a time constant and a division ratio that are decided with the resistors R31, R32 and the capacitor C3.
  • the voltage of the non-inverting input terminal is a threshold that defines the lower limit of the current range CRd.
  • the transistor Tr3 is also turned on, and the resistor R33 is connected to GND. Thereby, a voltage of the non-inverting input terminal of the operational amplifier OP4 decreases according to a time constant and a division ratio that are decided with the resistors R31, R32, R33 and the capacitor C3.
  • the voltage of the non-inverting input terminal is a threshold that defines the upper limit of the current range CRc.
  • the motor controlling unit 3 is, in turn, supplied with a designation voltage of the duty factor DFb higher than a designation voltage of the duty factor DFc and a designation voltage of the duty factor DFa higher than a designation voltage of the duty factor DFb.
  • the motor 4 is driven by PWM control according to the duty factor DFb and PWM control according to the duty factor DFa in turn.
  • FIG. 6 shows a liquid circulation system of a second embodiment.
  • the liquid circulation system differs from the first embodiment in that the sensing unit 1 including the current sensing unit 10 is provided with a current smoothing circuit 5.
  • the current smoothing circuit 5 is configured to smooth (reduce the ripple of) a voltage across the current sensing unit 10 (shunt resistance) according to a time constant.
  • the smoothed voltage is amplified with an amplifier including the operational amplifier OP1 to be supplied to the signal generating unit 2.
  • the signal generating unit 2 may be supplied with a signal (hereinafter referred to as an "inrush signal") such as an inrush current when the motor 4 is activated, a motor current increased by rapid open operation of the valves Va-Vd, or a motor current increased when a duty factor is changed to a higher duty factor.
  • an inrush signal such as an inrush current when the motor 4 is activated, a motor current increased by rapid open operation of the valves Va-Vd, or a motor current increased when a duty factor is changed to a higher duty factor.
  • the inverting terminals of the operational amplifiers OP2-OP4 in the signal generating unit 2 are supplied with voltages higher than voltages of the non-inverting terminals, so that all output of the operational amplifiers OP2-OP4 concurrently become Low and a signal of the duty factor DFd (designation voltage) is supplied to the motor controlling unit 3.
  • the current smoothing circuit 5 having a time constant defined by a resistor R6 and a capacitor C6.
  • a time corresponding to the time constant is set to a time within which the aforementioned inrush signal is faded away or disappeared (hereinafter referred to as a "disappearance time"), or more. If the time corresponding to the time constant is too long, a duty factor switching operation is delayed with respect to a change of the motor current, and accordingly it is desirable that the time corresponding to the time constant should be set to about twice the disappearance time.
  • FIG. 7 shows a liquid circulation system of a third embodiment.
  • a time-constant circuit 6 is located in the signal generating unit 2, and configured to supply the motor controlling unit 3 with a signal of a duty factor (designation voltage) smoothed with the time-constant circuit 6.
  • a signal of a duty factor (designation voltage) produced through the resistors R1-R5 is smoothed according to a time constant defined by the resistors R1-R5, R7 and a capacitor C7 to be supplied to the motor controlling unit 3.
  • a sudden change of a signal of a duty factor in PWM control is suppressed by providing the time-constant circuit 6 for a duty factor switching. Consequently, it is possible to reduce vibration and noise generated at switching phase of motor control.
  • the pipe resistance changes by opening or closing each of the valves Va-Vd of the predetermined pipe lines La-Ld.
  • Each pipe resistance of the pipe line La-Ld is known (previously measured), and the duty factors DFa-Dfd are predetermined based on the pipe line La-Ld.
  • the motor 4 is controlled by PWM control according to the duty factors.
  • the circular channel L is a common channel connected with at least first and second pipe lines La and Lb which are connected in parallel with each other.
  • the circular channel L also has: a first pipe resistance when one of the first and second pipe lines La and Lb is opened; or a second pipe resistance when two of the first and second pipe lines La and Lb are opened.
  • the signal generating unit 2 has at least first and second range CRa and CRb, where the first range CRa corresponds to the first pipe resistance (preferably only the first pipe resistance) and the second range CRb corresponds to the second pipe resistance (preferably only the second pipe resistance).
  • the circular channel L is a common channel connected with only the first and second pipe lines La and Lb, and has the first pipe resistance or the second pipe resistance.
  • the signal generating unit 2 is comprised of the resistors R1, R4 and R5 and the comparison circuit 21a, and may further include the time-constant circuit 6.
  • This signal generating unit 2 is configured: to supply the motor controlling unit 3 with a signal of a first duty factor DFa if the pipe resistance measured with the sensing unit 1 is lower than an upper limit of the first range CRa; to supply the motor controlling unit 3 with a signal of a second duty factor DFb if the pipe resistance is higher than the upper limit; and to supply the motor controlling unit 3 with a signal of the first duty factor DFa if the pipe resistance becomes lower than a lower limit of the second range CRa while supplying the motor controlling unit 3 with a signal of the second duty factor DFb.
  • the circular channel L is a common channel connected with only the first to third pipe lines La to Lc, and has the first pipe resistance, the second pipe resistance or the third pipe resistance.
  • the signal generating unit 2 is comprised of the resistors R1, R2, R4 and R5 and the comparison circuits 21a and 21b, and may further include the time-constant circuit 6.
  • This signal generating unit 2 is configured: to supply the motor controlling unit 3 with a signal of a first duty factor DFa if the pipe resistance measured with the sensing unit 1 is lower than an upper limit of the first range CRa; to supply the motor controlling unit 3 with a signal of a second duty factor DFb if the pipe resistance is higher than the upper limit; and to supply the motor controlling unit 3 with a signal of the first duty factor DFa if the pipe resistance becomes lower than a lower limit of the second range CRb while supplying the motor controlling unit 3 with a signal of the second duty factor DFb.
  • the signal generating unit 2 is also configured to supply the motor controlling unit 3 with a signal of a third duty factor DFc if the pipe resistance is higher than an upper limit of the second range CRb.
  • the signal generating unit 2 is further configured: to supply the motor controlling unit 3 with a signal of the second duty factor DFb if the pipe resistance becomes lower than a lower limit of the third range CRc and higher than the lower limit of the second range CRb while supplying the motor controlling unit 3 with a signal of the third duty factor DFc; and to supply the motor controlling unit 3 with a signal of the first duty factor DFa if the pipe resistance becomes lower than the lower limit of the second range CRb while supplying the motor controlling unit 3 with a signal of the third duty factor DFc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP20120157670 2011-03-25 2012-03-01 Pumpvorrichtung und Flüssigkeitsumlaufsystem mit der Vorrichtung Withdrawn EP2503155A2 (de)

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JP2011068381A JP2012202317A (ja) 2011-03-25 2011-03-25 ポンプ装置及びこれを備えた液体循環装置

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004232607A (ja) 2003-01-31 2004-08-19 Shinano Kenshi Co Ltd ポンプ駆動装置及びポンプ駆動装置の制御方法

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Publication number Priority date Publication date Assignee Title
JPH0731300Y2 (ja) * 1989-07-26 1995-07-19 日新電機株式会社 コンデンサ群開閉装置の制御装置
JP3768045B2 (ja) * 1999-09-24 2006-04-19 株式会社日立産機システム インバータ
JP2002327688A (ja) * 2001-04-27 2002-11-15 Kasuga Electric Works Ltd 油圧ポンプの油吐出量制御方法及びその装置
JP2005016460A (ja) * 2003-06-27 2005-01-20 Aisin Seiki Co Ltd 電動液体ポンプの制御方法および装置
JP4802529B2 (ja) * 2005-03-18 2011-10-26 アイシン精機株式会社 電動液体ポンプ、その制御方法および制御装置
JP2007162700A (ja) * 2007-01-31 2007-06-28 Ebara Corp ポンプ装置
JP2008271628A (ja) * 2007-04-16 2008-11-06 Jtekt Corp 電流検出回路
JP5289415B2 (ja) * 2010-11-10 2013-09-11 三菱電機株式会社 同期電動機の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004232607A (ja) 2003-01-31 2004-08-19 Shinano Kenshi Co Ltd ポンプ駆動装置及びポンプ駆動装置の制御方法

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