JPS5771295A - Speed controller for induction motor - Google Patents
Speed controller for induction motorInfo
- 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
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.
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) |
-
1980
- 1980-10-20 JP JP55146684A patent/JPS5771295A/en active Pending
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