CN202495911U - Apparatus preventing voltage fluctuation from causing electric motor to stop - Google Patents
Apparatus preventing voltage fluctuation from causing electric motor to stop Download PDFInfo
- Publication number
- CN202495911U CN202495911U CN2012200733808U CN201220073380U CN202495911U CN 202495911 U CN202495911 U CN 202495911U CN 2012200733808 U CN2012200733808 U CN 2012200733808U CN 201220073380 U CN201220073380 U CN 201220073380U CN 202495911 U CN202495911 U CN 202495911U
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- China
- Prior art keywords
- relay
- series
- contactor
- button switch
- stop
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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.)
- Expired - Fee Related
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- Motor And Converter Starters (AREA)
Abstract
The utility model discloses an apparatus preventing voltage fluctuation from causing an electric motor to stop. The apparatus comprises a slowly released relay, a slowly closed relay, a contactor, a start button switch and a stop button switch. The slowly released relay is connected in parallel with the contactor, and then is connected in series with the stop button switch to form a first series loop. A normally closed switch of the slowly closed relay is connected in parallel with a normal open switch of the contactor, and then is connected in series with the slowly closed relay to form a second series loop. The first series loop and the second series loop are connected in parallel, one end of which is connected with one end of an alternating current power source, and the other end of which is connected in series with the start button switch and then is connected with the other end of the alternating current power source. The end connecting the alternating current power source of the start button switch is connected with the other end of a normal open switch of the slowly released relay. A main contact of the contactor is connected in series with an input power source of the electric motor. The apparatus preventing voltage fluctuation from causing the electric motor to stop has a simple structure and an obvious implementation effect, avoids the occurrences of the abnormal heat generation of, the rotation stopping, and even the burn-out of the electric motor.
Description
Technical field
The utility model relates to a kind of control device of electric motor, relates in particular to a kind of device that prevents that voltage fluctuation from causing motor to stop.
Background technology
The output torque that conference has influence on motor is crossed in voltage fluctuation; Cause the imbalance of positive sequence component electric current and negative sequence component electric current; Parameter generating such as the direct stator current to motor of meeting, rotor current, electromagnetic torque directly influence; Therefore make motor have the situation of abnormal heating to occur, cause motor to stop even burning out motor.
Summary of the invention
The purpose of the utility model provides a kind of device that prevents that voltage fluctuation from causing motor to stop with regard to being in order to address the above problem.
The utility model is realized above-mentioned purpose through following technical scheme:
The utility model comprises slow release relay, slow attracting electric relay, contactor, start button switch and stop button switch; Connect with said stop button switch again after said slow release relay and the said contactor parallel connection and form first series loop; Connect with said slow attracting electric relay again after the normal open switch parallel connection of the normally closed switch of said slow attracting electric relay and said contactor and form second series loop; Said first series loop is connected in parallel afterwards with said second series loop, and the one of which end is connected with an end of AC power; Its other end is connected and is connected with the other end of said AC power behind the said start button switch; The end that said slow attracting electric relay connects the normal open switch of said contactor is connected with an end of the normal open switch of said slow release relay; The end that said start button switch connects said AC power is connected with the other end of the normal open switch of said slow release relay, and the main contacts of said contactor is connected in series in the input power supply of said motor; The output of said AC power is connected in series with fuse; The output of said AC power also is connected in series with the thermal relay break contact.
The beneficial effect of the utility model is:
The utility model has reduced to cause the imbalance of positive sequence component electric current and negative sequence component electric current; Having reduced parameter generating such as stator current to motor, rotor current, electromagnetic torque directly influences, simple in structure, implementation result obviously, avoid the motor abnormal heating, stop operating even burn out the situation of motor.
Description of drawings
Accompanying drawing is the utility model circuit structure schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
Shown in accompanying drawing: the utility model comprises slow release relay KT1, slow attracting electric relay KT2, contactor KM, start button switch S B1 and stop button switch S B2; Formation first series loop of slowly connecting with stop button switch S B2 again after release relay KT1 and the contactor KM parallel connection; Formation second series loop of slowly connecting with slow attracting electric relay again after the normal open switch parallel connection of the normally closed switch of attracting electric relay KT2 and contactor KM; First series loop is connected in parallel afterwards with second series loop, and the one of which end is connected with an end of AC power; Be connected with the other end of AC power behind its other end tandem promoter push-button switch SB1; Slowly an end of the normal open switch of attracting electric relay KT2 connection contactor is connected with an end of the normal open switch of slow release relay KT1; The end that start button switch S B1 connects AC power is connected with the other end of the normal open switch of slow release relay KT1, and the main contacts of contactor KM is connected in series in the input power supply of motor; The output of AC power is connected in series with fuse F U; The output of AC power also is connected in series with thermal relay break contact FR.
Shown in accompanying drawing: during startup, press start button switch S B1, contactor KM and time relay KT1, KT2 in succession electric adhesive, and often open the self-locking of time-delay break contact through the gentle slow-releasing relay KT1 of the normally opened contact of contactor KM.The slowly normally closed time-delay break contact time-delay of attracting electric relay KT2 in addition, the main contacts of contactor KM is closed, and motor rotates.
Shown in accompanying drawing: when stopping, pressing stop button switch S B2, then the gentle slow-releasing relay KT1 outage of contactor KM discharges the motor stall.The normally opened contact time-delay that slowly release relay KT1 is closed is broken off, and slowly attracting electric relay KT2 outage discharges the instantaneous closure of its normally closed time-delay break contact.
Shown in accompanying drawing: when circuit voltage fluctuation or of short duration powers failure, contactor KM, slowly release relay KT1, the slow attracting electric relay KT2 release of all cutting off the power supply, motor stall.But slowly the time-delay of release relay KT1 normally opened contact is broken off; Ifs circuit voltage did not recover normal before slowly open release relay KT1 contact; Then the gentle slow-releasing relay KT1 coil of contactor KM still can pass through slow release relay KT1 and get electric self-locking with slow attracting electric relay KT2 contact, and motor starts automatically, if voltage recovers normal after slowly release relay KT1 delayed contact breaks off; Then control circuit is obstructed, and motor can not start voluntarily.
Can be according to the adjust delay time of slow release relay KT1 of voltage fluctuation situation, slowly the delay time of attracting electric relay KT2 is as long as guarantee the operate time of contactor KM contact.
Claims (3)
1. device that prevents that voltage fluctuation from causing motor to stop; It is characterized in that: comprise slow release relay, slow attracting electric relay, contactor, start button switch and stop button switch; Connect with said stop button switch again after said slow release relay and the said contactor parallel connection and form first series loop; Connect with said slow attracting electric relay again after the normal open switch parallel connection of the normally closed switch of said slow attracting electric relay and said contactor and form second series loop; Said first series loop is connected in parallel afterwards with said second series loop, and the one of which end is connected with an end of AC power; Its other end is connected and is connected with the other end of said AC power behind the said start button switch; The end that said slow attracting electric relay connects the normal open switch of said contactor is connected with an end of the normal open switch of said slow release relay; The end that said start button switch connects said AC power is connected with the other end of the normal open switch of said slow release relay, and the main contacts of said contactor is connected in series in the input power supply of said motor.
2. a kind of device that prevents that voltage fluctuation from causing motor to stop according to claim 1, it is characterized in that: the output of said AC power is connected in series with fuse.
3. a kind of device that prevents that voltage fluctuation from causing motor to stop according to claim 1, it is characterized in that: the output of said AC power also is connected in series with the thermal relay break contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200733808U CN202495911U (en) | 2012-03-01 | 2012-03-01 | Apparatus preventing voltage fluctuation from causing electric motor to stop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200733808U CN202495911U (en) | 2012-03-01 | 2012-03-01 | Apparatus preventing voltage fluctuation from causing electric motor to stop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202495911U true CN202495911U (en) | 2012-10-17 |
Family
ID=47002123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200733808U Expired - Fee Related CN202495911U (en) | 2012-03-01 | 2012-03-01 | Apparatus preventing voltage fluctuation from causing electric motor to stop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202495911U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832856A (en) * | 2012-09-13 | 2012-12-19 | 山西潞安矿业(集团)有限责任公司 | Medium-voltage soft starting device |
-
2012
- 2012-03-01 CN CN2012200733808U patent/CN202495911U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832856A (en) * | 2012-09-13 | 2012-12-19 | 山西潞安矿业(集团)有限责任公司 | Medium-voltage soft starting device |
| CN102832856B (en) * | 2012-09-13 | 2015-05-06 | 山西潞安矿业(集团)有限责任公司 | Medium-voltage soft starting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20130301 |