CN2553551Y - Phase failure protection automatic controller for three-phase electric motor - Google Patents
Phase failure protection automatic controller for three-phase electric motor Download PDFInfo
- Publication number
- CN2553551Y CN2553551Y CN 02217640 CN02217640U CN2553551Y CN 2553551 Y CN2553551 Y CN 2553551Y CN 02217640 CN02217640 CN 02217640 CN 02217640 U CN02217640 U CN 02217640U CN 2553551 Y CN2553551 Y CN 2553551Y
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- CN
- China
- Prior art keywords
- phase
- main contact
- electric motor
- fuse
- motor
- 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 belongs to the electric motor protection technical field, in particular to a phase failure protection automatic controller for three-phase electric motor, which consists of a three-phase knife switch, a fuse, an AC contactor, an intermediate relay, a start button, a stop button and an electric motor connected through circuits. A power phase 3 is connected in serial with a temperature controller, which can control the start and stop of refrigeratory or the three-phase electric motor of water chiller.
Description
Technical field
The utility model belongs to the electric motor protecting technical field, is specifically related to a kind of open-phase protection automatic control equipment of three phase electric machine.
Background technology
In worker, agricultural production and research work, the use of three phase electric machine is more prevalent.But because a variety of causes, the three phase mains load is seriously inhomogeneous, often causes wherein one to transship mutually and cause this to open circuit mutually.In this case, if motor continues operation, then can burn out the motor coil winding.In order to prevent this phenomenon, people are everlasting and connect thermal relay in the circuit of three phase electric machine.Three phase electric machine is in service, and the operating current of motor increases if lack an electricity mutually, and then the normally closed interlock of thermal relay disconnects, the contactor coil dead electricity of control motor, thus the outage of motor main circuit is stopped.But at this moment three phase electric machine has been subjected to the damage of big electric current, though the time is very short, can produce various hidden danger, as causes motor working efficiency reduction etc.
Summary of the invention
The purpose of this utility model is to propose a kind of phase shortage automatic control equipment that can disconnect the motor general supply in moment.
The open-phase protection automatic control equipment of the three phase electric machine of the utility model design is connected and composed through circuit by Three-phase knife switch, fuse, A.C. contactor, auxiliary relay, starting button, stop button, motor, sees shown in Figure 1.Wherein, A.C. contactor by sucking coil 8, often open main contact 9 serial connection and constitute; Auxiliary relay by sucking coil 10, often open main contact 11 serial connection and constitute; Starting button 13, the contact is for often opening; Stop button 12, contact are normally closed.Three-phase knife switch 5, fuse 6, starting button 12, stop button 13 series connection.(its series system is that start button 12 can be serially connected in before or after the contact of main contact 11).Often open main contact 9 (3) and be serially connected between fuse 6 (3) and the motor 7 (three-phase), main contact 11 (3) is connected between fuse 6 (3) and the main contact 9 (3).
Also can on power phase 3, be connected in series temperature controller in the utility model, according to the three phase electric machine starting and shutdown automatically of the handpiece Water Chilling Units that temperature rises, freezer or three phase electric machine are controlled in decline.
The course of work of the present utility model is as follows:
After Three-phase knife switch 5 closures, three phase mains 1,2,3 arrives X1, X2, the X3 position of protective device through Three-phase knife switch 5, fuse 6, also not starting of motor 7 at this moment.Behind closed starting button 13,1 phase current is by stop button 12, starting button 13, and auxiliary relay sucking coil 10 is switched on, auxiliary relay main contact 11 closures, and electric current arrives loop 4, constitutes current circuit.Disconnect starting button 13 subsequently, because auxiliary relay main contact 11 still is in closure state, auxiliary relay sucking coil 10 does not cut off the power supply at this moment, simultaneously, 2,3 two phase place electric currents are by auxiliary relay main contact 11, then the electric current A.C. contactor sucking coil 8 of flowing through makes A.C. contactor main contact 9 closures, and motor 7 is started working.
In motor operation course, if 1 phase place sudden power, auxiliary relay main contact 11 can be because of the 10 dead electricity automatic disconnections of auxiliary relay sucking coil, at this moment exchange contactor sucking coil 8 because of dead electricity, sucking coil 8 not adhesives, cause A.C. contactor main contact 9 to disconnect, motor 7 loses three-phase electricity simultaneously, quits work.If 2, a phase sudden power wherein in 3 phase places also can cause the A.C. contactor sucking coil 8 can not adhesive, and A.C. contactor main contact 9 is disconnected, guarantee that motor loses three-phase electricity simultaneously, quit work.Because three-phase electricity disconnects simultaneously, so motor 7 can not be subjected to big electrical injuries.
Motor 7 needs to stop when work, as long as click stop button 12, just stops immediately.
Use this protective device, electric mutually as if scarce any one when actuating motor 7, the main contact 9 of A.C. contactor all can not be closed, and motor is avoided big electrical injuries when starting with assurance.
This circuit has automatic controlled function, promptly drops to and needs temperature when temperature of ice house, and the three-phase electricity chance is stopped, when temperature of ice house rises to uniform temperature, and the running of three-phase electricity chance; This circuit also has auto-lock function, promptly when restoring electricity again after the general supply outage, can not self-drive after the motor stall, and closure starting button once again, motor is just reset.
Description of drawings
1 is power phase, and 2 is power phase, and 3 is power phase, 4 is the loop, and 5 is Three-phase knife switch, and 6 is three-phase fuse, 7 is three phase electric machine, 8 is the A.C. contactor sucking coil, and 9 is the A.C. contactor main contact, and 10 is the auxiliary relay sucking coil, 11 is the auxiliary relay main contact, 12 is stop button, and 13 is starting button, and 14 is temperature controller.
Embodiment
Claims (2)
1, a kind of open-phase protection automatic control equipment of three phase electric machine, it is characterized in that connecting and composing through circuit by Three-phase knife switch, fuse, A.C. contactor, auxiliary relay, starting button, stop button, motor, wherein, A.C. contactor by sucking coil (8), often open main contact (9) serial connection and constitute; Auxiliary relay by sucking coil (10), often open main contact (11) serial connection and constitute; Starting button (13), the contact is for often opening; Stop button (12), contact are normally closed; Three-phase knife switch (5), fuse (6), starting button (13), stop button (12) series connection; Often open main contact (9) and be serially connected between fuse (6) and the three phase electric machine (7), often open main contact (11) and be connected between fuse (6) and the main contact (9).
2, a kind of open-phase protection automatic control equipment of three phase electric machine as claimed in claim 1 is characterized in that also can going up serial connection temperature controller (14) at power phase (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02217640 CN2553551Y (en) | 2002-05-23 | 2002-05-23 | Phase failure protection automatic controller for three-phase electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02217640 CN2553551Y (en) | 2002-05-23 | 2002-05-23 | Phase failure protection automatic controller for three-phase electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2553551Y true CN2553551Y (en) | 2003-05-28 |
Family
ID=33696411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02217640 Expired - Fee Related CN2553551Y (en) | 2002-05-23 | 2002-05-23 | Phase failure protection automatic controller for three-phase electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2553551Y (en) |
-
2002
- 2002-05-23 CN CN 02217640 patent/CN2553551Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |