JPS5487815A - Driving device for ac motor - Google Patents
Driving device for ac motorInfo
- Publication number
- JPS5487815A JPS5487815A JP15697177A JP15697177A JPS5487815A JP S5487815 A JPS5487815 A JP S5487815A JP 15697177 A JP15697177 A JP 15697177A JP 15697177 A JP15697177 A JP 15697177A JP S5487815 A JPS5487815 A JP S5487815A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- transformer
- power inverter
- low speed
- boosting transformer
- 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)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
PURPOSE: To remove a state of the motor being short of torque and saturation due to DC excitation in the transformer, by means of bypassing a boosting transformer, when at low speed, to directly apply an output of power inverter to the motor.
CONSTITUTION: An electromagnetic contactor 14, installed between a three-phase bridge power inverter 5 and a primary winding 12 of a boosting transformer 6, and an electromagnetic contactor 15, with a bypass circuit 40 installed for directly making a connection between the power inverter 5 and armature winding 8 of a motor 7 without routing through the boosting transformer 6, are provided. By a switching operation of those of the above electromagnetic contactors, an output of control pole-provided electric valve controller will be applied to the armature winding not through the boosting transformer when in a low speed operation of the motor at low voltage and low frequency, further with the control circuit made working a relating operation. In this way, a torque shortage of the motor, coming from a poor transformer operation at the time of low speed running, and a state of saturation, due to a DC excitation of the transformer, can be eliminated.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15697177A JPS5487815A (en) | 1977-12-26 | 1977-12-26 | Driving device for ac motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15697177A JPS5487815A (en) | 1977-12-26 | 1977-12-26 | Driving device for ac motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5487815A true JPS5487815A (en) | 1979-07-12 |
Family
ID=15639320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15697177A Pending JPS5487815A (en) | 1977-12-26 | 1977-12-26 | Driving device for ac motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5487815A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4944217A (en) * | 1972-09-07 | 1974-04-25 |
-
1977
- 1977-12-26 JP JP15697177A patent/JPS5487815A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4944217A (en) * | 1972-09-07 | 1974-04-25 |
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