CN2217276Y - Protection arrangement against phase interruption for three phase electric motor - Google Patents
Protection arrangement against phase interruption for three phase electric motor Download PDFInfo
- Publication number
- CN2217276Y CN2217276Y CN 94246787 CN94246787U CN2217276Y CN 2217276 Y CN2217276 Y CN 2217276Y CN 94246787 CN94246787 CN 94246787 CN 94246787 U CN94246787 U CN 94246787U CN 2217276 Y CN2217276 Y CN 2217276Y
- Authority
- CN
- China
- Prior art keywords
- contactor
- phase
- control circuit
- power line
- contacts
- 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
Links
Landscapes
- Control Of Ac Motors In General (AREA)
- Motor And Converter Starters (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The utility model discloses an automatic protector for a three-phase motor, which is used for preventing the damage of phase interruption. The utility model comprises the contacts of a contactor and a contact control circuit, wherein, the contacts of a contactor are connected with a power cord. The utility model is characterized in that the contacts are two groups of normally open contacts and are controlled by two control circuits; a first control circuit composed of a button, the coil of a contactor and the normally open contact of the coil of a contactor is connected with two phases of the automatic protector, and a second control circuit composed of the coil of a contractor is connected with the other phase and any of other phases. The utility model has the advantages of simple structure, low cost, etc., and is adapted to a common three-phase motor which is commonly used.
Description
The utility model belongs to a kind of phase failure protector that is used for the automatic safety device, the particularly threephase motor that prevent phase failure harm of motor.
The equal more complicated of phase failure protector structure of present existing threephase motor, cost are also higher; generally be applicable to big motor or more senior equipment; and the common threephase motor that is unsuitable for generally using uses, so present common threephase motor is subjected to the situation of phase failure harm more serious.
The utility model is to realize like this.A kind of phase failure protector of threephase motor; comprise contacts of contactor and the contactor control circuit that is connected with power line on the three-phase power line that is connected in motor; it is characterized in that this contacts of contactor that is connected on the three-phase power line is two groups of normally opened contacts; and controlled by two contactor control circuits; wherein first contactor control circuit is connected in the wherein two-phase of power line; its formation includes button; contactor coil and normally opened contact thereof, second contactor control circuit be connected in power line another mutually with first contactor control circuit connect mutually arbitrary; its formation includes contactor coil.
The contactor of such scheme can replace with relay or other similar electrical switch element, and this situation should be considered as equivalent of the present utility model.
The phase failure protector of such scheme; owing to adopt two foolproof control circuits to be connected on the three-phase power line; to control two groups of contacts that are connected on the power line; so all can cut off the three phase mains of motor during any phase phase failure; and because two control circuits only are made of two contactors and button; so structure is very simple, it is cheap, and the common threephase motor that is suitable for generally using uses.
Below in conjunction with accompanying drawing the utility model is done to describe more specifically.
Fig. 1 is the line map of a kind of scheme of the utility model.
With reference to Fig. 1, this phase failure protector comprises contacts of contactor and the contactor control circuit that is connected with power line 1～3 on the three-phase power line 1～3 that is connected in motor M, and feature is that the contacts of contactor that is connected in three-phase power line is two groups of normally opened contact J
1-1～J
1-3And J
2-1～J
2-3, and controlled by two contactor control circuits, wherein first contactor control circuit 1,2 phases, its formation of being connected in power line comprises contactor coil J
1And normally opened contact J
1-4, button K
1, 2,3 phases, its formation that second contactor control circuit is connected in power line comprise contactor coil J
2In addition, the concrete formation of first contactor control circuit is making button K
1With normally opened contact J
1-4Parallel circuits and coil J
1Be cascaded; The electric motor normal working of also connecting on first contactor control circuit is shut down the moving disconnected button K of usefulness
2This phase failure protector also includes fuse F
1～F
3
During work, press the button K
1, first contactor control circuit from power line 1,2 mutually electric, contact J
1-1～J
1-4Closure, subsequently second contactor control circuit from power line 2,3 mutually electric, contact J
2-1～J
2-3Closure, at this moment motor M gets electric work.When power line 1,2 has the arbitrary phase phase failure mutually, the first contactor control circuit dead electricity, contact J
1-1～J
1-4Disconnect, motor quits work.When the power line 3 phase phases failure, the second contactor control circuit dead electricity, contact J
2-1～J
2-3Disconnect, motor quits work.When motor will be shut down in normal operation, can press the button K
2, contact J
1-1～J
1-3Disconnect, motor quits work.
Claims (2)
1; a kind of phase failure protector of threephase motor; comprise contacts of contactor and the contactor control circuit that is connected with power line on the three-phase power line that is connected in motor; it is characterized in that this contacts of contactor that is connected on the three-phase power line is two groups of normally opened contacts; and controlled by two contactor control circuits; wherein first contactor control circuit is connected in the wherein two-phase of power line; its formation includes button; contactor coil and normally opened contact thereof, second contactor control circuit be connected in power line another mutually with first contactor control circuit connect mutually arbitrary; its formation includes contactor coil.
2, by the described protector of claim 1, the formation that it is characterized in that described first contactor control circuit is that the parallel circuits and the contactor coil of making button and contactor normally opened contact is cascaded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94246787 CN2217276Y (en) | 1994-11-30 | 1994-11-30 | Protection arrangement against phase interruption for three phase electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94246787 CN2217276Y (en) | 1994-11-30 | 1994-11-30 | Protection arrangement against phase interruption for three phase electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2217276Y true CN2217276Y (en) | 1996-01-10 |
Family
ID=33852188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94246787 Expired - Fee Related CN2217276Y (en) | 1994-11-30 | 1994-11-30 | Protection arrangement against phase interruption for three phase electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2217276Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436773A (en) * | 2011-09-15 | 2012-05-02 | 宁波市鄞州供电局 | Analog circuit breaker |
-
1994
- 1994-11-30 CN CN 94246787 patent/CN2217276Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436773A (en) * | 2011-09-15 | 2012-05-02 | 宁波市鄞州供电局 | Analog circuit breaker |
| CN102436773B (en) * | 2011-09-15 | 2014-03-12 | 宁波市鄞州供电局 | Analog circuit breaker |
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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 |