JPS5631383A - Preventive device for reverse running of ac motor - Google Patents
Preventive device for reverse running of ac motorInfo
- Publication number
- JPS5631383A JPS5631383A JP10726779A JP10726779A JPS5631383A JP S5631383 A JPS5631383 A JP S5631383A JP 10726779 A JP10726779 A JP 10726779A JP 10726779 A JP10726779 A JP 10726779A JP S5631383 A JPS5631383 A JP S5631383A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- switch
- reverse running
- frequency converter
- phase rotation
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/097—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against wrong direction of rotation
Landscapes
- Motor And Converter Starters (AREA)
Abstract
PURPOSE:To prevent reverse running of an AC motor by a method wherein the exclusive OR of a rotation direction detector interlocking with a small-sized motor connected to an AC motor driven by means of a variable voltage/variable frequency converter and the instruction for revolution direction is utilized. CONSTITUTION:An AC motor 22 is driven by means of a frequency converter 21, and the direction of rotation is selected by operating a phase rotation change-over circuit 20 by means of a phase rotation change-over switch 15. On the other hand, a switch 23 and a small-sized AC motor 24 are mounted between the frequency converter 21 and the motor 22, and a rotation direction detector 25 is interlocked and installed to the motor 24. The signals of the detector 25 and the signals of the phase rotation change-over switch 15 are provided to an exclusive-or circuit 26, and an exciting coil 27 of the switch 23 is operated by the output. Thereby, the switch 23 can be interrupted when the motor intends to turn in the direction different from the operation instructions due to an erroneous operation, etc. of a control circuit, and reverse running can be prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10726779A JPS5631383A (en) | 1979-08-24 | 1979-08-24 | Preventive device for reverse running of ac motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10726779A JPS5631383A (en) | 1979-08-24 | 1979-08-24 | Preventive device for reverse running of ac motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5631383A true JPS5631383A (en) | 1981-03-30 |
Family
ID=14454716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10726779A Pending JPS5631383A (en) | 1979-08-24 | 1979-08-24 | Preventive device for reverse running of ac motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5631383A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59172993A (en) * | 1983-03-23 | 1984-09-29 | Hitachi Ltd | Reverse rotation preventing device of dc motor with position detector |
EP0429867A2 (en) * | 1989-10-31 | 1991-06-05 | Mita Industrial Co. Ltd. | Error detecting unit of motor rotation control device |
-
1979
- 1979-08-24 JP JP10726779A patent/JPS5631383A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59172993A (en) * | 1983-03-23 | 1984-09-29 | Hitachi Ltd | Reverse rotation preventing device of dc motor with position detector |
EP0429867A2 (en) * | 1989-10-31 | 1991-06-05 | Mita Industrial Co. Ltd. | Error detecting unit of motor rotation control device |
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