JPS5517271A - Operating system for ac motor - Google Patents
Operating system for ac motorInfo
- Publication number
- JPS5517271A JPS5517271A JP8997178A JP8997178A JPS5517271A JP S5517271 A JPS5517271 A JP S5517271A JP 8997178 A JP8997178 A JP 8997178A JP 8997178 A JP8997178 A JP 8997178A JP S5517271 A JPS5517271 A JP S5517271A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- power source
- induction motor
- inverter
- speed reference
- 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
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
PURPOSE: To recognize the start of operation by a variable frequency power source by detecting the electricity amount inherent to ac motors in starting the operation by the variable frequency power source.
CONSTITUTION: If a speed-down instruction is given during an operation of an induction motor 13 by a commercial power source 11, a switch 122 is opened so that the induction motor 13 is put to an idle operation and the speed drops. After a fixed period of time, an inverter operation starts at a frequency corresponding to a speed n0 set in a speed reference 312. A comparator circuit 8 recognizes that the induction motor 13 is put to the inverter operation with the fact that the output current of the inverter has exceeded an excitation current I0. Then the switch 321 is closed and the comparator circuit 38 serves to set the speed reference n to start the operation after being put to the speed reference 311 condition.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8997178A JPS5517271A (en) | 1978-07-25 | 1978-07-25 | Operating system for ac motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8997178A JPS5517271A (en) | 1978-07-25 | 1978-07-25 | Operating system for ac motor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5517271A true JPS5517271A (en) | 1980-02-06 |
JPS6120234B2 JPS6120234B2 (en) | 1986-05-21 |
Family
ID=13985559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8997178A Granted JPS5517271A (en) | 1978-07-25 | 1978-07-25 | Operating system for ac motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5517271A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61106092A (en) * | 1984-10-29 | 1986-05-24 | Sansha Electric Mfg Co Ltd | Operating method for induction motor |
-
1978
- 1978-07-25 JP JP8997178A patent/JPS5517271A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61106092A (en) * | 1984-10-29 | 1986-05-24 | Sansha Electric Mfg Co Ltd | Operating method for induction motor |
Also Published As
Publication number | Publication date |
---|---|
JPS6120234B2 (en) | 1986-05-21 |
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