JPS5577392A - Controller for induction motor - Google Patents
Controller for induction motorInfo
- Publication number
- JPS5577392A JPS5577392A JP15154078A JP15154078A JPS5577392A JP S5577392 A JPS5577392 A JP S5577392A JP 15154078 A JP15154078 A JP 15154078A JP 15154078 A JP15154078 A JP 15154078A JP S5577392 A JPS5577392 A JP S5577392A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- sequence
- current
- negative
- positive
- 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)
- Stopping Of Electric Motors (AREA)
Abstract
PURPOSE: To reduce the cost of a controller, by connecting impedance elements in series with controlled rectifier block groups for applying a positive-phase-sequence voltage and a negative-phase-sequence voltage to an electric motor.
CONSTITUTION: When a complete phase short circuit takes place, namely, when a positive-phase-sequence and a negative-phase-sequnce thyristor block groups 3, 4 are simultaneously closed, a short-circuit current flows throughout the period of at least one wave of power. Since current-limiting reactors 10, 11 are copuled in series with the negative-phase-sequence thyrsitor block group 4, the short-circuit current is suppressed below the overcurrent strength of thyristors. An abnormal current is detected by current transformers 12, 13. A current feedback signal is applied to a turn-on unit 7 to block thyristor gates to cut off a dynamic current. An overcurrent due to a cause except for the simultaneous closing of the positive-phase- sequence and negative-phase-sequence thyristor block groups 3, 4 does not exceed the overcurrent strength of the thyristors because a short circuit takes place through impedances as far as there is no wrong connection.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15154078A JPS5577392A (en) | 1978-12-07 | 1978-12-07 | Controller for induction motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15154078A JPS5577392A (en) | 1978-12-07 | 1978-12-07 | Controller for induction motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5577392A true JPS5577392A (en) | 1980-06-11 |
Family
ID=15520738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15154078A Pending JPS5577392A (en) | 1978-12-07 | 1978-12-07 | Controller for induction motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5577392A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61176999U (en) * | 1985-04-23 | 1986-11-05 | ||
JPH0564491A (en) * | 1991-12-04 | 1993-03-12 | Meidensha Corp | Inverter control method for induction mot0r |
-
1978
- 1978-12-07 JP JP15154078A patent/JPS5577392A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61176999U (en) * | 1985-04-23 | 1986-11-05 | ||
JPH0564491A (en) * | 1991-12-04 | 1993-03-12 | Meidensha Corp | Inverter control method for induction mot0r |
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