JPS5445728A - Control system for ac motor - Google Patents

Control system for ac motor

Info

Publication number
JPS5445728A
JPS5445728A JP11122777A JP11122777A JPS5445728A JP S5445728 A JPS5445728 A JP S5445728A JP 11122777 A JP11122777 A JP 11122777A JP 11122777 A JP11122777 A JP 11122777A JP S5445728 A JPS5445728 A JP S5445728A
Authority
JP
Japan
Prior art keywords
frequency
motor
frequency converter
output
driven
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
JP11122777A
Other languages
Japanese (ja)
Other versions
JPS5636675B2 (en
Inventor
Akio Hirata
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 JP11122777A priority Critical patent/JPS5445728A/en
Publication of JPS5445728A publication Critical patent/JPS5445728A/en
Publication of JPS5636675B2 publication Critical patent/JPS5636675B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE: To correctly shift an operation of AC motor from commercial power source to frequency converter, by means of switching the frequency converter with an output freqeucny made lower than the maximum output frequency.
CONSTITUTION: An AC motor is driven by a frequency converter in a range below a prescribed speed and by a commercial power source in a range above that speed. At this time, an AC motor 17, having been driven by a commercial power source 11, when switched to be driven by a frequency converter 14, is made shifting after an output frequency of the converter 14 is lowered down below the maximum output frequency. In such way, a difference increases between load torque and generated torque at this frequency, and even if the generated torque varies in the frequency vonverter due to a change of output voltage and a ripple of output current, a big defference of the generated torque can stably shift an operation into the frequency converter
COPYRIGHT: (C)1979,JPO&Japio
JP11122777A 1977-09-17 1977-09-17 Control system for ac motor Granted JPS5445728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11122777A JPS5445728A (en) 1977-09-17 1977-09-17 Control system for ac motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11122777A JPS5445728A (en) 1977-09-17 1977-09-17 Control system for ac motor

Publications (2)

Publication Number Publication Date
JPS5445728A true JPS5445728A (en) 1979-04-11
JPS5636675B2 JPS5636675B2 (en) 1981-08-25

Family

ID=14555759

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11122777A Granted JPS5445728A (en) 1977-09-17 1977-09-17 Control system for ac motor

Country Status (1)

Country Link
JP (1) JPS5445728A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02132063U (en) * 1989-04-06 1990-11-02

Also Published As

Publication number Publication date
JPS5636675B2 (en) 1981-08-25

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