CN208257694U - A kind of electric motor starting control device - Google Patents
A kind of electric motor starting control device Download PDFInfo
- Publication number
- CN208257694U CN208257694U CN201820835336.3U CN201820835336U CN208257694U CN 208257694 U CN208257694 U CN 208257694U CN 201820835336 U CN201820835336 U CN 201820835336U CN 208257694 U CN208257694 U CN 208257694U
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- CN
- China
- Prior art keywords
- branch
- contactor
- electric motor
- normally opened
- time relay
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- 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.)
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Abstract
The utility model provides a kind of electric motor starting control device, including major loop and control loop, it include electric motor starting branch and motor normal operation branch in parallel on major loop, control loop includes the first branch and second branch, string is equipped with the normally-closed contact and time relay coil of control switch, second contactor in the first branch, and time relay coil both ends are connected in parallel to first contactor coil；String is equipped with normally opened auxiliary contact, time relay normally open contact and the second contactor coil of first contactor in second branch, and normally opened auxiliary contact and the control switch of first contactor are connected in parallel；The branch circuit parallel connection that the normally opened auxiliary contact and the normally opened auxiliary contact of first contactor, time relay normally open contact of second contactor are constituted connects.After motor normal operation, second contactor normally-closed contact is disconnected, and disconnects time relay coil power loss, and avoiding time relay coil and being chronically at energized state causes time relay coil to damage.
Description
Technical field
The utility model belongs to electric motor starting technical field, in particular to a kind of electric motor starting control device.
Background technique
The general capacity of high-voltage motor is all bigger, have it is several hundred differ to several megawatts, according to the mode directly initiated into
Row control, then up to 4-7 times of rated current of inrush current can all cause powerful impact to power grid and motor itself,
On the one hand or even motor itself unfavorable to power grid and peripheral equipment stable operation also due to situations such as overcurrent, low-voltage go out
The case where now electric motor starting being caused to fail, on the other hand excessive dash current also results in certain damage to motor itself, adds
Speed motor insulation ag(e)ing influences its service life, so generally all the mode of reduced-voltage starting can be taken to be controlled, motor decompression
Starting can make motor timely enter normal operating condition, and effectively preventing motor, the damages such as motor are asked during startup
Topic.Commonly reduced-voltage starting control mode has frequency converter starting to control, soft activator controls, fixed/serial rotor resistance start controls,
Stator series reactor starting control, stator string compensator starting control etc..
Such as Publication No. " CN107294426A ", in entitled " a kind of high-voltage motor starting power-saving running optimize device "
State's patent, the size that the device of the patent effectively controls starting current during electric machine step-down starting prevent motor or control
Cabinet processed is damaged.But the patent, during the reduced-voltage starting of motor, time relay coil is constantly in energization shape
State can be accelerated to damage the time relay, result even in the electricity in later period since time relay coil is constantly in energized state
The failure of machine reduced-voltage starting.
Utility model content
The purpose of this utility model is to provide a kind of electric motor starting control devices, drop for solving motor in the prior art
The time relay is constantly in the problem of energized state causes time relay coil to damage in pressure start-up course.
To achieve the above object, the technical solution of the utility model is:
The utility model provides a kind of electric machine step-down starting device, a kind of electric motor starting control device, including major loop
And control loop, it include electric motor starting branch and motor normal operation branch in parallel, the control loop on the major loop
Including the first branch and second branch, it is timely to be equipped with control switch, the normally-closed contact of second contactor for string in the first branch
Between relay coil, the time relay coil both ends are connected in parallel to first contactor coil；It is gone here and there in the second branch
Normally opened auxiliary contact, time relay normally open contact and second contactor coil equipped with first contactor, first contact
The normally opened auxiliary contact of device are connected in parallel with the control switch；The normally opened auxiliary contact of second contactor and first contactor
A part of branch circuit parallel connection of second branch where normally opened auxiliary contact, time relay normally open contact connects.
Further, the electric motor starting branch includes the normally opened main contacts and sectional pressure element of concatenated first contactor,
The motor normal operation branch includes the normally opened main contacts of second contactor.
As the further restriction to sectional pressure element, the sectional pressure element is resistance.
Further, the electric motor starting branch road also string is equipped with the first electrothermal relay for motor overload protection.
Further, the control switch is normally opened hand push button.
In order to cut off control loop safely when emergency case occurs, also string is equipped with normally closed hand in the first branch
Dynamic button.
Further, also string is equipped with the second electrothermal relay for overload protection in the first branch.
The beneficial effects of the utility model are:
The electric motor starting control device of the utility model realizes the reduced-voltage starting of motor, and normally opened in second contactor
After contact closure motor operates normally, second contactor normally-closed contact is disconnected, and is disconnected time relay coil power loss, is avoided
Time relay coil, which is chronically at energized state, causes time relay coil to damage, to protect time relay line
Circle, extends the service life of time relay coil, has saved cost, improve the reliability of electric machine step-down starting.
Detailed description of the invention
Fig. 1 is the schematic diagram of the major loop of the electric machine step-down starting device of the utility model；
Fig. 2 is the schematic diagram of the control loop of the electric machine step-down starting device of the utility model.
Specific embodiment
Specific embodiment of the present utility model is further described with reference to the accompanying drawing:
A kind of electric motor starting control device, including major loop and control loop include electric motor starting in parallel on major loop
Branch and motor normal operation branch, control loop include the first branch and second branch, and string is equipped with control and opens in the first branch
It closes, the normally-closed contact and time relay coil of second contactor, time relay coil both ends are connected in parallel to the first contact
Device coil；String is equipped with normally opened auxiliary contact, time relay normally open contact and the second contact of first contactor in second branch
Device coil, normally opened auxiliary contact and the control switch of first contactor are connected in parallel；The normally opened auxiliary contact of second contactor with
A part of branch circuit parallel connection of second branch where the normally opened auxiliary contact of first contactor, time relay normally open contact connects
It connects.
Further, electric motor starting branch includes the normally opened main contacts and sectional pressure element of concatenated first contactor, motor
Normal operation branch includes the normally opened main contacts of second contactor.
The sectional pressure element of the present embodiment is resistance；Above-mentioned electric motor starting branch road also string is equipped with to be protected for motor overload
The first electrothermal relay；The control switch set is gone here and there in the first branch as normally opened hand push button；For the energy when emergency case occurs
Enough safety cuts off control loop, and also string is equipped with normally closed hand push button in the first branch；Also string is equipped with for overloading in the first branch
Second electrothermal relay of protection.
Motor plays important role in modern industry, and the reduced-voltage starting of motor is also increasingly taken seriously, star three
Angle reduced-voltage starting, the application of string resistance reduced-voltage starting are universal, are required in both methods using to the time relay, and the time
Relay charges always in reduced-voltage starting circuit, this will bring damage to the time relay, in order to solve drawbacks described above, this
Embodiment provides a kind of electric motor starting control device, specific as depicted in figs. 1 and 2 by taking string resistance reduced-voltage starting as an example, electricity
Machine starting control device includes major loop and control loop, and major loop includes that electric motor starting branch and motor in parallel operate normally
Branch, successively string is equipped with breaker 1QF, fuse FU, the normally opened main contacts of first contactor KM1, drop for electric motor starting branch road
One end of piezoresistance R and electrothermal relay FR1, electrothermal relay FR1 are connect with one end of dropping resistor R, and electrothermal relay FR1's is another
For connecting with one end of motor M, the other end of motor is grounded at end；String is equipped with second contactor in motor normal operation branch
The normally opened main contacts of KM2, the normally opened main contacts of second contactor KM2 and the normally opened main contacts of first contactor KM1 and resistance R group
At a part of branch circuit parallel connection connection.Control loop includes two branches, the respectively first branch, second branch, the first branch
On successively string be equipped with the second electrothermal relay FR2, normally closed hand push button SB1, normally opened hand push button SB2, second contactor KM2 it is normal
Closed contact and time relay KT coil, time relay KT coil both ends are connected in parallel to first contactor KM1 coil；Second
Branch road string is equipped with the normally opened contact and second contactor KM2 of the normally opened auxiliary contact of first contactor KM1, time relay KT
Coil；The tie point of the normally-closed contact of normally opened hand push button SB2, second contactor KM2 and the normally opened auxiliary of first contactor KM1
Contact, time relay normally open contact tie point pass through conducting wire connect；The normally opened auxiliary contact of second contactor KM2 and first
A part of branch circuit parallel connection of second branch where the normally opened auxiliary contact of contactor KM1, the normally opened contact of time relay KT
Connection.
Manual depression of button SB2, first contactor KM1 coil obtain electric, make the normally opened main contacts of first contactor KM1 and normally opened
Auxiliary contact closure, KM1 obtain electric and self-locking, motor M reduced-voltage starting, while time relay coil obtains electric, prolongs by certain
When the time, time relay normally open contact closure, obtain the coil of second contactor KM2 electric, further, second contactor
The normally opened main contacts of KM2 and normally opened auxiliary contact closure, KM2 obtain electric and self-locking, motor M normal operation.Second contactor simultaneously
The normally-closed contact of KM2 disconnects, and time relay coil power loss avoids so that the time relay be cut off from control loop
The time relay is constantly in the case where energized state causes the time relay to damage, and also avoids the decompression of later period motor and opens
Dynamic failure, improves the efficiency of electric machine step-down starting.
Specific embodiment is presented above, but the utility model is not limited to embodiment described above.This
The basic ideas of utility model are above-mentioned basic scheme, for those of ordinary skill in the art, according to the present utility model
Introduction, the model, formula, parameter for designing various modifications do not need to spend creative work.The utility model is not being departed from
Principle and spirit in the case where the guarantor of the utility model is still fallen within to variation, modification, replacement and the deformation that embodiment carries out
It protects in range.
Claims (7)
1. a kind of electric motor starting control device, which is characterized in that including major loop and control loop, including simultaneously on the major loop
The electric motor starting branch and motor normal operation branch of connection, the control loop include the first branch and second branch, and described
One road string is equipped with the normally-closed contact and time relay coil of control switch, second contactor, the time relay line
Circle both ends are connected in parallel to first contactor coil；In the second branch string be equipped with first contactor normally opened auxiliary contact,
Time relay normally open contact and second contactor coil, the normally opened auxiliary contact of the first contactor and the control switch
It is connected in parallel；The normally opened touching of normally opened auxiliary contact, the time relay of the normally opened auxiliary contact and first contactor of second contactor
A part of branch circuit parallel connection connection of second branch where point.
2. electric motor starting control device according to claim 1, which is characterized in that the electric motor starting branch includes series connection
First contactor normally opened main contacts and sectional pressure element, the motor normal operation branch includes the normally opened master of second contactor
Contact.
3. electric motor starting control device according to claim 2, which is characterized in that the sectional pressure element is resistance.
4. electric motor starting control device according to claim 2, which is characterized in that the electric motor starting branch road also string is set
There is the first electrothermal relay for motor overload protection.
5. electric motor starting control device according to claim 1, which is characterized in that the control switch is pressed manually to be normally opened
Button.
6. electric motor starting control device according to claim 5, which is characterized in that also string is equipped with often in the first branch
Close hand push button.
7. electric motor starting control device according to claim 6, which is characterized in that also string is equipped with use in the first branch
In the second electrothermal relay of overload protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820835336.3U CN208257694U (en) | 2018-05-31 | 2018-05-31 | A kind of electric motor starting control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820835336.3U CN208257694U (en) | 2018-05-31 | 2018-05-31 | A kind of electric motor starting control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208257694U true CN208257694U (en) | 2018-12-18 |
Family
ID=64652730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820835336.3U Expired - Fee Related CN208257694U (en) | 2018-05-31 | 2018-05-31 | A kind of electric motor starting control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208257694U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422541A (en) * | 2021-06-22 | 2021-09-21 | 河北白沙烟草有限责任公司 | Method for improving operation reliability of isolating switch |
| CN113555852A (en) * | 2021-07-09 | 2021-10-26 | 中国核电工程有限公司 | Control circuit and control method of valve motor |
-
2018
- 2018-05-31 CN CN201820835336.3U patent/CN208257694U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422541A (en) * | 2021-06-22 | 2021-09-21 | 河北白沙烟草有限责任公司 | Method for improving operation reliability of isolating switch |
| CN113422541B (en) * | 2021-06-22 | 2022-11-01 | 河北白沙烟草有限责任公司 | Method for improving operation reliability of isolating switch |
| CN113555852A (en) * | 2021-07-09 | 2021-10-26 | 中国核电工程有限公司 | Control circuit and control method of valve motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181218 |