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JPS561788A - Method of switching power supply of induction motor - Google Patents

Method of switching power supply of induction motor

Info

Publication number
JPS561788A
JPS561788A JP7598679A JP7598679A JPS561788A JP S561788 A JPS561788 A JP S561788A JP 7598679 A JP7598679 A JP 7598679A JP 7598679 A JP7598679 A JP 7598679A JP S561788 A JPS561788 A JP S561788A
Authority
JP
Japan
Prior art keywords
inverter
switching
induction motor
motor
power supply
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
JP7598679A
Other languages
Japanese (ja)
Inventor
Tadashi Ichioka
Giichi Ishijima
Akio Ihara
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.)
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Electric Manufacturing 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 Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Electric Manufacturing Co Ltd
Priority to JP7598679A priority Critical patent/JPS561788A/en
Publication of JPS561788A publication Critical patent/JPS561788A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To suppress the large current to a motor at switching and to prevent the cross current from an inverter at the time of the parallel operation by switching the operation to the inverter when the relationship between the output frequency of the inverter and the number of rotation of the motor indicates the zero slip. CONSTITUTION:An induction motor IM is connected to the commercial power source Pc via an electromagnetic contactor 88c. A variable AC power supply IV is composed of a converter portion and a voltage-type inverter portion. The output side of the variable AC power supply IV is connected to the induction motor IM via an electromagnetic contactor 88I. A pulse pickup PP which is a speed sensor senses the number of rotation of the induction motor IM. For switching the operation from the commercial power source to the inverter IV, the frequency is followed to the number of rotation of the motor IM after the release of the commercial power source, and the inverter IV is turned on when the output voltage of the inverter IV becomes sufficiently low, thereafter the switching to the operation of the inverter IV at the specified value is accomplished.
JP7598679A 1979-06-15 1979-06-15 Method of switching power supply of induction motor Pending JPS561788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7598679A JPS561788A (en) 1979-06-15 1979-06-15 Method of switching power supply of induction motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7598679A JPS561788A (en) 1979-06-15 1979-06-15 Method of switching power supply of induction motor

Publications (1)

Publication Number Publication Date
JPS561788A true JPS561788A (en) 1981-01-09

Family

ID=13592087

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7598679A Pending JPS561788A (en) 1979-06-15 1979-06-15 Method of switching power supply of induction motor

Country Status (1)

Country Link
JP (1) JPS561788A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57129198A (en) * 1981-01-30 1982-08-11 Hitachi Ltd Controlling method and device for ac motor
JPS5829302A (en) * 1981-08-14 1983-02-21 Japanese National Railways<Jnr> Controlling device for linear synchronous motor vehicle
JPS6149682A (en) * 1984-08-16 1986-03-11 Mitsubishi Electric Corp Speed controller for motor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5450812A (en) * 1977-09-28 1979-04-21 Mitsubishi Electric Corp Power source change over device of induction motors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5450812A (en) * 1977-09-28 1979-04-21 Mitsubishi Electric Corp Power source change over device of induction motors

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57129198A (en) * 1981-01-30 1982-08-11 Hitachi Ltd Controlling method and device for ac motor
JPH0121715B2 (en) * 1981-01-30 1989-04-21 Hitachi Ltd
JPS5829302A (en) * 1981-08-14 1983-02-21 Japanese National Railways<Jnr> Controlling device for linear synchronous motor vehicle
JPS633525B2 (en) * 1981-08-14 1988-01-25 Tetsudo Sogo Gijutsu Kenkyusho
JPS6149682A (en) * 1984-08-16 1986-03-11 Mitsubishi Electric Corp Speed controller for motor

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