CN201594804U - Starting circuit of asynchronous motor - Google Patents
Starting circuit of asynchronous motor Download PDFInfo
- Publication number
- CN201594804U CN201594804U CN2009202674431U CN200920267443U CN201594804U CN 201594804 U CN201594804 U CN 201594804U CN 2009202674431 U CN2009202674431 U CN 2009202674431U CN 200920267443 U CN200920267443 U CN 200920267443U CN 201594804 U CN201594804 U CN 201594804U
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- CN
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- Prior art keywords
- motor
- starting
- current
- relay
- circuit
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a starting circuit of an asynchronous motor, which comprises a current limiting resistor, bidirectional thyristors, a time relay and an intermediate relay, wherein the bidirectional thyristors are connected with the current limiting resistor in parallel to be used as a short-circuit circuit of the current limiting resistor for the motor starting. The triggering loops of the three bidirectional thyristors are respectively controlled by three normally open contacts of one intermediate relay. The utility model has simple structure, the motor winding has no power-off state in the starting process, the voltage fluctuation and shock current are reduced, and the motor is stable to start.
Description
Affiliated technical field
The utility model relates to a kind of control circuit that reduces the threephase asynchronous starting current.
Background technology
During the motor direct-on-line starting, its starting current is 6-8 a times of rated current, generally adopts the reduced voltage starting method to limit starting current.Star triangle starting equipment mechanism more complicated commonly used, can only be applicable to the motor that moves in the triangle mode, and there is a weak point, promptly when star connection switches to delta connection, the instant cut-off state appears in the motor winding, power supply grid and motor, electric component are caused bigger secondary pulse electric current, also influence the smooth start of motor.
Summary of the invention
The starting method that is to be intended to provide a kind of threephase motor of the present utility model at the deficiencies in the prior art, there is not off-position in the starting process, starting circuit is simple in structure, is applicable to delta connection or with the starting of the threephase motor of star connection.
The technical scheme that its technical problem that solves the utility model adopts is: the major loop of motor start circuit and control loop are controlled with same threephase switch.In the major loop, the every phase line that picks out from threephase switch links to each other with threephase motor after sealing in the parallel circuits of current-limiting resistance and bidirectional thyristor.In the control loop, the normally opened contact of the time relay connects the auxiliary relay coil, three groups of normally opened contacts of auxiliary relay are connected across respectively between first main pole and gate pole of three bidirectional thyristors after respectively sealing in substitutional resistance, form the triggering loop of bidirectional thyristor.The threephase switch closure, during motor starting, power supply is connected threephase motor by current-limiting resistance earlier; Simultaneously in the control loop time relay get electric, after time-delay, time relay normally opened contact closure, auxiliary relay gets electric, auxiliary relay normally opened contact closure, the triggering and conducting bidirectional thyristor will start the current-limiting resistance short circuit, finish the smooth start of motor.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
In Fig. 1, three current-limiting resistance R
A, R
B, R
CResistance equates, three bidirectional thyristor T
A, T
B, T
CModel is identical, and three bidirectional thyristors trigger loop current-limiting resistance r
A, r
b, r
CResistance equates.
After threephase switch QK energized, three phase mains is earlier by current-limiting resistance R
A, R
B, R
CStarting threephase motor, time relay J in the control loop simultaneously
SMust be electric, time-delay back J
SThe normally opened contact closure, auxiliary relay J
MMust be electric, J
MThree groups of normally opened contacts closed simultaneously, trigger the bidirectional thyristor conducting, will start the current-limiting resistance short circuit, motor is finished starting, enters normal operation.
Claims (3)
1. threephase asynchronous starting circuit comprises current-limiting resistance, the bidirectional thyristor of major loop; The time relay of control loop and auxiliary relay is characterized in that: the shorting member of current-limiting resistance is a bidirectional thyristor behind the motor starting.
2. motor start circuit according to claim 1, three groups of normally opened contacts that it is characterized in that an auxiliary relay, seal in the triggering loop of three bidirectional thyristors respectively, the output switch of the time relay connects the switching of control auxiliary relay coil.
3. motor start circuit according to claim 1 is characterized in that the described time relay, auxiliary relay, bidirectional thyristor and motor are controlled by same threephase switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202674431U CN201594804U (en) | 2009-10-20 | 2009-10-20 | Starting circuit of asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202674431U CN201594804U (en) | 2009-10-20 | 2009-10-20 | Starting circuit of asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201594804U true CN201594804U (en) | 2010-09-29 |
Family
ID=42776869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202674431U Expired - Fee Related CN201594804U (en) | 2009-10-20 | 2009-10-20 | Starting circuit of asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201594804U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471326A (en) * | 2015-12-28 | 2016-04-06 | 天津市福锐达电气成套设备工程有限公司 | Starting and stopping control system of three-phase irreversible motor |
| CN111313766A (en) * | 2018-12-12 | 2020-06-19 | 上海安浦鸣志自动化设备有限公司 | Driver current-limiting starting circuit and method for direct-current power supply system |
-
2009
- 2009-10-20 CN CN2009202674431U patent/CN201594804U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471326A (en) * | 2015-12-28 | 2016-04-06 | 天津市福锐达电气成套设备工程有限公司 | Starting and stopping control system of three-phase irreversible motor |
| CN111313766A (en) * | 2018-12-12 | 2020-06-19 | 上海安浦鸣志自动化设备有限公司 | Driver current-limiting starting circuit and method for direct-current power supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Xingning Inventor after: Yao Yejing Inventor after: Xie Zhongzhi Inventor before: Li Xingning Inventor before: Yao Yejing |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI XINGNING YAO YEJING TO: LI XINGNING YAO YEJING XIE ZHONGZHI |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100929 Termination date: 20121020 |