JPS5484217A - Induction motor rpm control system - Google Patents
Induction motor rpm control systemInfo
- Publication number
- JPS5484217A JPS5484217A JP15135977A JP15135977A JPS5484217A JP S5484217 A JPS5484217 A JP S5484217A JP 15135977 A JP15135977 A JP 15135977A JP 15135977 A JP15135977 A JP 15135977A JP S5484217 A JPS5484217 A JP S5484217A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- signal
- rpm
- transistor
- 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
Links
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
PURPOSE: To permit omission of the hitherto required differential amplifier and simplification of the construction by restricting the primary voltage through reduction of an rpm setting signal with a primary voltage feedback signal of an induction motor.
CONSTITUTION: A voltage detection circuit 9 for detecting the output voltage of a control element circuit 2 for effecting phase control according to a signal of a firing circuit 7 and a transistor circuit 13 adapted to be operated when the voltage of the circuit 9 exceeds a predetermined value are provided, and with a voltage drop produced by collector current caused through a transistor 17 with the operation of the circuit 13 the rpm signal is reduced to reduce the rpm. Thus, it is possible to omit the hitherto required differential amplifier and make use of the transistor threshold voltage for the non-sensitive band of the voltage feed-back signal, thus permitting simplification of the construction.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52151359A JPS5911273B2 (en) | 1977-12-16 | 1977-12-16 | Induction motor speed control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52151359A JPS5911273B2 (en) | 1977-12-16 | 1977-12-16 | Induction motor speed control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5484217A true JPS5484217A (en) | 1979-07-05 |
JPS5911273B2 JPS5911273B2 (en) | 1984-03-14 |
Family
ID=15516810
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52151359A Expired JPS5911273B2 (en) | 1977-12-16 | 1977-12-16 | Induction motor speed control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5911273B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60170685U (en) * | 1984-04-18 | 1985-11-12 | 昭和アルミニウム株式会社 | ice maker |
-
1977
- 1977-12-16 JP JP52151359A patent/JPS5911273B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5911273B2 (en) | 1984-03-14 |
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