JPS57146082A - Constant torque obtaining apparatus for use in electric- hydraulic servopump system - Google Patents

Constant torque obtaining apparatus for use in electric- hydraulic servopump system

Info

Publication number
JPS57146082A
JPS57146082A JP56031876A JP3187681A JPS57146082A JP S57146082 A JPS57146082 A JP S57146082A JP 56031876 A JP56031876 A JP 56031876A JP 3187681 A JP3187681 A JP 3187681A JP S57146082 A JPS57146082 A JP S57146082A
Authority
JP
Japan
Prior art keywords
pump
current
signal
current transformer
constant 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.)
Pending
Application number
JP56031876A
Other languages
Japanese (ja)
Inventor
Takao Wada
Yoshio Togashi
Takashi Yamada
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.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
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 Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Priority to JP56031876A priority Critical patent/JPS57146082A/en
Publication of JPS57146082A publication Critical patent/JPS57146082A/en
Pending legal-status Critical Current

Links

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
    • 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
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0202—Voltage
    • 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
    • F04B2207/00—External parameters
    • F04B2207/04—Settings
    • F04B2207/048—Settings of a reference voltage of the driving motor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE:To provide a constant torque obtaining apparatus capable of changing characteristics of operation with ease, by detecting current of a motor by a current transformer, and outputting a signal to a servo-mechanism so that the value of the current detected by the current transformer may not exceed a predetermined value. CONSTITUTION:Current for driving a hydraulic pump 1 is detected by a current transformer 10 and converted into a DC voltage V. Subtraction is made in a subtraction circuit 13 as to the voltage V and a reference voltage Ve preset in a means 14 for setting a limit current for a motor and the deviation DELTAV of the above two voltages is given as an input to a deviation comparator 15, which classifies the load conditions of the pump into three types and produces signals E1, E2, E3 corresponding to the three types of load condition. In an arithmetic circuit, a signal Y is produced from the signal representing the load condition of the pump and an output signal X of a means 17 for instructing the discharge rate of the pump, and a servo-mechanism 2 is driven according to the signal Y, whereby it is enabled to limit the maximum discharge rate of the pump, to protect the pump against overloading and to obtain a maximum output within a tolerable range.
JP56031876A 1981-03-05 1981-03-05 Constant torque obtaining apparatus for use in electric- hydraulic servopump system Pending JPS57146082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56031876A JPS57146082A (en) 1981-03-05 1981-03-05 Constant torque obtaining apparatus for use in electric- hydraulic servopump system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56031876A JPS57146082A (en) 1981-03-05 1981-03-05 Constant torque obtaining apparatus for use in electric- hydraulic servopump system

Publications (1)

Publication Number Publication Date
JPS57146082A true JPS57146082A (en) 1982-09-09

Family

ID=12343232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56031876A Pending JPS57146082A (en) 1981-03-05 1981-03-05 Constant torque obtaining apparatus for use in electric- hydraulic servopump system

Country Status (1)

Country Link
JP (1) JPS57146082A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61250390A (en) * 1985-04-26 1986-11-07 オ−・ウント・カ−・オ−レンシユタイン・ウント・コツペル・アクチエンゲゼルシヤフト Working method of operating electric machine by hydraulic circuit for movable construction equipment
US20140311138A1 (en) * 2013-04-22 2014-10-23 Illinois Tool Works Inc. Systems and methods for detecting a type of hydraulic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61250390A (en) * 1985-04-26 1986-11-07 オ−・ウント・カ−・オ−レンシユタイン・ウント・コツペル・アクチエンゲゼルシヤフト Working method of operating electric machine by hydraulic circuit for movable construction equipment
US20140311138A1 (en) * 2013-04-22 2014-10-23 Illinois Tool Works Inc. Systems and methods for detecting a type of hydraulic device
US9835181B2 (en) * 2013-04-22 2017-12-05 Illinois Tool Works Inc. Systems and methods for detecting a type of hydraulic device
US10001148B2 (en) 2013-04-22 2018-06-19 Illinois Tool Works Inc. Systems and methods for detecting a type of hydraulic device

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