JPS5771295A - Speed controller for induction motor - Google Patents

Speed controller for induction motor

Info

Publication number
JPS5771295A
JPS5771295A JP55146684A JP14668480A JPS5771295A JP S5771295 A JPS5771295 A JP S5771295A JP 55146684 A JP55146684 A JP 55146684A JP 14668480 A JP14668480 A JP 14668480A JP S5771295 A JPS5771295 A JP S5771295A
Authority
JP
Japan
Prior art keywords
signal
speed
omegas
control
angular 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
JP55146684A
Other languages
Japanese (ja)
Inventor
Kuniharu Iwasaki
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 Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
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 Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP55146684A priority Critical patent/JPS5771295A/en
Publication of JPS5771295A publication Critical patent/JPS5771295A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To achieve a highly accurate speed control without a speed detector by employing a double control loop through a slip angular frequency arithmetic unit and an overshooting prevention circuit as a feedback system for speed controlling and frequency controlling amplifiers. CONSTITUTION:A speed command value is passed through a soft starter 2 to obtain a slip angular frequency command signal omegas* and a secondary command signal I2 from a difference beween it and a rotor speed detection value and an angular frequency setting signal Fo is obtained from a difference between a signal omegas from a slip angular frequency arithmetic unit 5 and the command signal omegas*. A signal omegas from a differentiation circuit 9 is added to Fo to form a primary frequency control signal and a difference between a signal of an overshooting prevention circuit 4 and the command signal omegas is used as a rotor speed detection N D to lower the speed command of a soft starter 2 with a stall prevention circuit 17. This eliminates a speed detector enabling a highly accurate control of a slip frequency as a closed loop control.
JP55146684A 1980-10-20 1980-10-20 Speed controller for induction motor Pending JPS5771295A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55146684A JPS5771295A (en) 1980-10-20 1980-10-20 Speed controller for induction motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55146684A JPS5771295A (en) 1980-10-20 1980-10-20 Speed controller for induction motor

Publications (1)

Publication Number Publication Date
JPS5771295A true JPS5771295A (en) 1982-05-04

Family

ID=15413241

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55146684A Pending JPS5771295A (en) 1980-10-20 1980-10-20 Speed controller for induction motor

Country Status (1)

Country Link
JP (1) JPS5771295A (en)

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