JPS57160394A - Protection of motor - Google Patents

Protection of motor

Info

Publication number
JPS57160394A
JPS57160394A JP56045464A JP4546481A JPS57160394A JP S57160394 A JPS57160394 A JP S57160394A JP 56045464 A JP56045464 A JP 56045464A JP 4546481 A JP4546481 A JP 4546481A JP S57160394 A JPS57160394 A JP S57160394A
Authority
JP
Japan
Prior art keywords
load current
overload
protection
motor
motors
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
JP56045464A
Other languages
Japanese (ja)
Inventor
Norimitsu Horiuchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56045464A priority Critical patent/JPS57160394A/en
Publication of JPS57160394A publication Critical patent/JPS57160394A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

PURPOSE:To protect a motor, by sampling load current at a plurality of motors, anticipating a next sampling value according to a variation between present and previous values, and reducing operation at overload. CONSTITUTION:A plurality of induction motors 1 in combination with overload relays 5 are provided to operate cooperatively during a process. A current transformer 6 detects each load current of motors 1. A protection 9 with first- stage alarm and second-stage trip having arithmetic function is supplied with the load current. The load current is sampled within the protection 9. The next sampling value is anticipated according to a variation between present and previous values. A corrective signal is produced at a process controller 10 to limit the load when there is a possibility of overload. This nullifies loss time during operation and protects the motor from overloading.
JP56045464A 1981-03-30 1981-03-30 Protection of motor Pending JPS57160394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045464A JPS57160394A (en) 1981-03-30 1981-03-30 Protection of motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045464A JPS57160394A (en) 1981-03-30 1981-03-30 Protection of motor

Publications (1)

Publication Number Publication Date
JPS57160394A true JPS57160394A (en) 1982-10-02

Family

ID=12720086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045464A Pending JPS57160394A (en) 1981-03-30 1981-03-30 Protection of motor

Country Status (1)

Country Link
JP (1) JPS57160394A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4929875A (en) * 1988-03-04 1990-05-29 Flyct Ab Method to control stops of an intermittently operating driving motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4929875A (en) * 1988-03-04 1990-05-29 Flyct Ab Method to control stops of an intermittently operating driving motor

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