CN2443522Y - Three-phase motor protector - Google Patents
Three-phase motor protector Download PDFInfo
- Publication number
- CN2443522Y CN2443522Y CN 00246758 CN00246758U CN2443522Y CN 2443522 Y CN2443522 Y CN 2443522Y CN 00246758 CN00246758 CN 00246758 CN 00246758 U CN00246758 U CN 00246758U CN 2443522 Y CN2443522 Y CN 2443522Y
- Authority
- CN
- China
- Prior art keywords
- phase
- contactor
- electricity
- electromagnetic wire
- utility
- 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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- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a three-phase motor protector, the body of which comprises two alternate current contactors which are connected in series. One phase of two-phase electrically connected with an electromagnetic wire wrap of the contactor and two-phase electrically connected with the other electromagnetic wire wrap of the contactor is different. In this way, the electromagnetic wire wraps of the two contactors relate to any phase of three-phase electricity, the electricity shortage of any phase in the three-phase electricity can cause one contactor to be in an off state, and accordingly, an integral electric source is automatically cut off in time, and the purpose of the protection of a three-phase motor is achieved. The utility model which is adopted can carry out automatic supply interruption of electrical appliances to the three-phase electricity at the time of open phase and cutoff and automatic switching-in when electricity is supplied.
Description
The utility model relates to a kind of three phase electric machine protective device.
In some occasion, three phase electric machine needs long time continuous working, is lacking one mutually under the situation of electricity, and people because of not noting and can not cutting off the electricity supply in time, cause three phase electric machine to be switched on because of two-phase and burnt out sometimes.
The purpose of this utility model is to provide a kind of three-phase motor protector that can in time cut off the electricity supply automatically when phase shortage.
For achieving the above object; the technical solution adopted in the utility model is: its main body is the A.C. contactor of two series connection; described contactor is connected between three phase mains and the protected load motor; the electromagnetic wire bag of its contactor 1 is connected to the wantonly two alternate of three phase mains, and the electromagnetic wire bag of contactor 2 is connected between discrepant two-phase power supply line of electromagnetic wire bag two phase connections of its input and contactor 1.
Adopt the utility model three-phase motor protector; because of two contactor series connection; have one to be different mutually because of in contactor electromagnetic wire two-phase that bag connects electricity and the two-phase electricity that another contactor electromagnetic wire bag is connect again; the electromagnetic wire bag of such two contactors just relates to the arbitrary phase in the three-phase electricity; any phase short of electricity all can cause some contactors to be in off-state in the three-phase electricity; thereby in time cut off whole power supply automatically; reach the purpose of protection three phase electric machine, and the utility model is simple in structure.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is an electrical schematic diagram of the present utility model.
As shown in Figure 1; the utility model three-phase motor protector; its main body is the A.C. contactor (existing products on the A.C. contactor employing market of two series connection; the coil voltage of producing as people's electrical equipment group company is the A.C. contactor of 380V); three end points of output that are contactor 1 are connected with lead accordingly with three end points of input of contactor 2; thereby the input that makes contactor 1 is total input; in order to connect three phase mains; the output of contactor 2 is total output, in order to connect three phase electric machine 3.From three end points of contactor 1 input, get two end points a, b links to each other with lead with two terminals of electromagnetic wire bag of contactor 1, from three end points of contactor 2 inputs, get b ', c ' links to each other with lead with two terminals of electromagnetic wire bag of contactor 2, because of two contactors are connected, a, the c mouth is not again on same electricity mutually, the electromagnetic wire bag loop of such two contactors just relate in the three-phase electricity each mutually, work as a, the b circuitry phase is arbitrary when cutting off the power supply mutually, because of electromagnetism disappearance contactor 1 is in off-state, cut off three phase mains by contactor 2, motor is quit work, when c cuts off the power supply mutually, because of electromagnetism disappears, contactor 2 is in off-state, thereby cuts off three phase mains by contactor 2, and motor is quit work.In addition, when incoming call recovers three-phase electricity,, motor is started working automatically, the manual operation of opening a sluice gate when saving outage, closing a floodgate when sending a telegram here because two contactors are in connected state simultaneously.The utility model not only utilizes in three phase electric machine protection, also can utilize the protection at three-phase compressors such as air-conditioning, refrigerators, so air-conditioning, freezer compressor use structure of the present utility model and be connected, and also surely belongs to protection range of the present utility model.
Claims (1)
1, a kind of three-phase motor protector; it is characterized in that its main body is the A.C. contactor of two series connection; described contactor is connected between three phase mains and the protected load motor; the electromagnetic wire bag of its contactor (1) is connected to the wantonly two alternate of three phase mains, and the electromagnetic wire bag of contactor (2) is connected between discrepant two-phase power supply line of electromagnetic wire bag two phase connections of its input and contactor (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00246758 CN2443522Y (en) | 2000-08-18 | 2000-08-18 | Three-phase motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00246758 CN2443522Y (en) | 2000-08-18 | 2000-08-18 | Three-phase motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2443522Y true CN2443522Y (en) | 2001-08-15 |
Family
ID=33605928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00246758 Expired - Fee Related CN2443522Y (en) | 2000-08-18 | 2000-08-18 | Three-phase motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2443522Y (en) |
-
2000
- 2000-08-18 CN CN 00246758 patent/CN2443522Y/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 |