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JPS5457616A - Control system for ac motor - Google Patents

Control system for ac motor

Info

Publication number
JPS5457616A
JPS5457616A JP12488777A JP12488777A JPS5457616A JP S5457616 A JPS5457616 A JP S5457616A JP 12488777 A JP12488777 A JP 12488777A JP 12488777 A JP12488777 A JP 12488777A JP S5457616 A JPS5457616 A JP S5457616A
Authority
JP
Japan
Prior art keywords
motor
frequency
primary
natural oscillation
oscillation frequency
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
JP12488777A
Other languages
Japanese (ja)
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 JP12488777A priority Critical patent/JPS5457616A/en
Priority to BR7806854A priority patent/BR7806854A/en
Priority to AU40833/78A priority patent/AU527786B2/en
Priority to US05/952,385 priority patent/US4296367A/en
Publication of JPS5457616A publication Critical patent/JPS5457616A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE: To provide a less torque ripple, by setting a primary voltage curve a prescribed level lower than the rated value of AC motor near at a primary frequency corresponding to a mechanically natural oscillation frequency of loads.
CONSTITUTION: When assuming E11 for a curve of primary voltage V1 at primary frequency f1 of an AC motor 13, in a case at a mechanically natural oscillation frequency fm1 of the motor 13 or load 14, the value of V1f1 outputted from a frequency converter 12 is set near at Fm1 lower than the rated value of the motor 13, with a torque ripple, generated from the motor 13, made to a small level almost proportional to (V1/f1)2. In this way, even for th AC motor being operated at a primary frequency corresponding to the mechanically natural oscillation frequency of the AC main motor or the load, although a mechanical resonance phenomenon is caused, an amplitude of the amplified oscillation phenomenon will be one per several parts as big as the past, and a safety operaton can be made without a destruction of material even with a weak part present of mechanical strength
COPYRIGHT: (C)1979,JPO&Japio
JP12488777A 1977-10-18 1977-10-18 Control system for ac motor Pending JPS5457616A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP12488777A JPS5457616A (en) 1977-10-18 1977-10-18 Control system for ac motor
BR7806854A BR7806854A (en) 1977-10-18 1978-10-17 PROCESS TO CONTROL THE SPEED OF AN AC-CURRENT ENGINE
AU40833/78A AU527786B2 (en) 1977-10-18 1978-10-18 A. c. motor speed control
US05/952,385 US4296367A (en) 1977-10-18 1978-10-18 Speed control method for AC motors and an apparatus for the control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12488777A JPS5457616A (en) 1977-10-18 1977-10-18 Control system for ac motor

Publications (1)

Publication Number Publication Date
JPS5457616A true JPS5457616A (en) 1979-05-09

Family

ID=14896543

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12488777A Pending JPS5457616A (en) 1977-10-18 1977-10-18 Control system for ac motor

Country Status (1)

Country Link
JP (1) JPS5457616A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156756U (en) * 1983-04-04 1984-10-20 三菱電機株式会社 Grinding machine spindle drive device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156756U (en) * 1983-04-04 1984-10-20 三菱電機株式会社 Grinding machine spindle drive device

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