CN100375361C - Three-phase A.C. dynamo protector - Google Patents
Three-phase A.C. dynamo protector Download PDFInfo
- Publication number
- CN100375361C CN100375361C CNB2004100237193A CN200410023719A CN100375361C CN 100375361 C CN100375361 C CN 100375361C CN B2004100237193 A CNB2004100237193 A CN B2004100237193A CN 200410023719 A CN200410023719 A CN 200410023719A CN 100375361 C CN100375361 C CN 100375361C
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- CN
- China
- Prior art keywords
- phase
- contact
- contactor
- coil
- motor
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Abstract
The present invention relates to a three-phase AC motor protector which belongs to the technical field of electrical engineering. The present invention comprises an AC contactor connected with a motor, and all of an A phase, a B phase and a C phase of the AC contactor are provided with fuse wires R, wherein a minitype contactor is arranged between the A phase and the B phase; one end of a start button K1 and one end of a stop button K2 are connected in parallel with an e point of the A phase, and the other end of the start button K1 and the other end of the stop button K2 are respectively matched with contacts a, b of a normally open movable switch-off switch controlled by a minitype relay coil B1; one end of the minitype relay coil B1 is connected with an F point of the B phase, and the other end is matched with a contact C of the normally open movable switch-off switch; a contact d of the normally open movable switch-off switch is matched with one end of an AC contactor coil B2, and the other end of the B2 is connected with a g point of the C phase; switches B2K11, B2K12, B2K13 controlled by the AC contactor coil B2 are arranged among the e point of the A phase, the f point of the B phase, the g point of the C phase and a load; when any phase of the A phase, the B phase and the C phase is in a phase lack state, or the motor is overloaded, the electricity can not be sent to the motor, and the safety of the motor is ensured. The present invention has the advantages of no complex circuit, easy maintenance, high automation and high broken circuit sensitivity, and is suitable for three-phase AC motors.
Description
Technical field
The present invention relates to a kind of three phase alternating current motor phase shortage autoprotection device, belong to electrical technology field.
Background technology
China now has various open-phase protector for three-phase motor at present, and has been widely used, but because of the phenomenon of phase shortage burning motor is still a lot, reason all causes because of electronic component is malfunctioning.Existing protector generally all is to adopt the electronic component assembling; be connected into voltage comparator; current transformer; be used for the size of measured motor operating current, when the power supply phase shortage, wherein biphase current will raise many; the induced current increase produces high level and makes the triode conducting in its corresponding instrument transformer secondary winding; relay gets electric and works, thereby makes the contactor action, and reporting to the police reaches the protection purpose.
Above maximum weak point is exactly, and in operate as normal, as when phase shortage occurring, it can not have a power failure immediately, because electronic component information sends, must need several seconds time, but behind the motor bringing onto load phase shortage work several seconds are danger closes.Add the electronic circuit complex structure, be difficult for making, the electronic component parameter is rotten, and performance is with great difficulty not malfunctioning, and the electrician personnel that generally are ignorant of electronic technology are difficult to repair, and often delay production.
Summary of the invention
The three-phase alternating current motor protector that the objective of the invention is to solve above-mentioned existing in prior technology shortcoming and a kind of auto-cutout when the motor phase shortage is provided, and for ease of maintenaince.
Overall technical architecture of the present invention is this kind three-phase alternating current motor protector, comprises A, the B that links to each other with motor, the A.C. contactor that the C three-phase all has fuse R, it is characterized in that being provided with a microcontactor between described A, B are mutually; Start button K
1, stop knob K
2One end is connected to 1 e of A phase, the other end respectively with by midget relay coil B
1Often start disconnection the pass first contact a, the second contact b of control match; Midget relay coil B
1One end is connected 1 f of B phase, and the other end cooperates with the 3rd contact c that often starts the disconnection pass; Often start and disconnect the 4th contact d and the ac contactor coil B that closes
2An end match B
2The other end connect 1 g of C phase; At above-mentioned 1 e in the A phase, 1 f of B phase is provided with by ac contactor coil B between 1 g of C phase and the load
2The switch B of control
2K
11, B
2K
12, B
2K
13
Automatic protection during for realization over current of motor, overload, voltage instability is at switch B
2K
13Be connected in series current coil B between the load
3, this current coil B
3With Chang Hedong disconnect to close B
3K
1Match, this often closes to disconnect and closes B
3K
1Be serially connected in the end points and the ac contactor coil B that match with the 4th contact d
2Between, form tie breaker.
For reducing volume, microcontactor and tie breaker are flat, are embedded at the left and right sides face of A.C. contactor main body.
The open-phase protection course of work:
Closed K
1, A conducts mutually, relay coil B
1Work, the second contact b on right side, the 4th contact d closure, the first contact a in left side, the 3rd contact c disconnect, and A is electricity and A.C. contactor B mutually
2Connect B
2Work, A, B, C three-phase electricity are sent to motor.
If A electricity mutually opens circuit relay coil B
1Power down, the second contact b on right side, the 4th contact d disconnect, relay coil B
2Power down, B, C electricity mutually can not be sent to motor.
If B electricity mutually opens circuit relay coil B
1Power down, A, C electricity mutually can not be sent to motor.
If C electricity mutually opens circuit ac contactor coil B
2Can not work, B, C electricity mutually can not be sent to motor.
Consequently when the mutually any phase phase shortage of A, B, C, electricity all can not be sent to motor, and the motor outage has guaranteed the safety of motor.
When overload, current coil B
3Action, Chang Hedong disconnects pass, B
3K
1Open, electricity can not be sent to motor.Realized overload protection.
The invention has the beneficial effects as follows: when the mutually any phase phase shortage of A, B, C or during motor overload, electricity all can not be sent to motor, and the motor outage has guaranteed the safety of motor.The present invention does not have complicated circuit, for ease of maintenaince.The automaticity height, it is highly sensitive to open circuit.
Description of drawings:
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is a side schematic perspective view of the present invention;
Fig. 3 is an another side of the present invention schematic perspective view.
Among the figure: 1 A.C. contactor, 2 microcontactors, 3 tie breakers.
Embodiment
As shown in Figure 1.
The present invention has designed a microcontactor 2 on the right side of existing A.C. contactor 1, realizes open-phase protection.This part structure is:
Be provided with a microcontactor between A, the B phase; Start button K
1, stop knob K
2One end is connected to 1 e of A phase, the other end respectively with by midget relay coil B
1Often start disconnection the pass first contact a, the second contact b of control match; Midget relay coil B
1One end is connected 1 f of B phase, and the other end cooperates with the 3rd contact c that often starts the disconnection pass; Often start and disconnect the 4th contact d and the ac contactor coil B that closes
2An end match ac contactor coil B
2The other end connect 1 g of C phase; At 1 e of above-mentioned A phase, 1 f of B phase is provided with by A.C. contactor B between 1 g of C phase and the load
2The switch B of control
2K
11, B
2K
12, B
2K
13
The present invention has designed a tie breaker 3 in the left side of existing A.C. contactor, as when over current of motor, overload, voltage instability occurring, it can auto-cutout.The structure of this part is: at switch B
2K
13Be connected in series current coil B between the load
3, this current coil B
3Be serially connected in the end points that matches with the 4th contact d and A.C. contactor, B
2Between Chang Hedong disconnect to close B
3K
1Match, form tie breaker.
Fig. 2, Fig. 3 show stereochemical structure of the present invention.Microcontactor and tie breaker are flat, are embedded at the two sides of A.C. contactor main body.
Under the normal condition, the ABC three-phase electricity at first enters the R fuse, arrives power motor after the A.C. contactor adhesive.
When the mutually any phase phase shortage of A, B, C, electricity all can not be sent to motor, and the motor outage has guaranteed the safety of motor.
When overload, current coil B
3Action, Chang Hedong disconnects and closes B
3K
1Open, electricity can not be sent to motor.Realize overload protection.
The present invention is suitable for the more enterprise of motors such as large, medium and small factory, self-employed worker, processing industry etc.
Claims (3)
1. the three-phase alternating current motor protector comprises A, the B that links to each other with motor, the A.C. contactor that the C three-phase all has fuse (R), it is characterized in that, is provided with a microcontactor between described A, the B phase; Start button (K
1), stop knob (K
2) end is connected to a bit (e) of A phase, the other end respectively with by midget relay coil (B
1) control often start disconnect to close first contact (a), second contact (b) matches; Midget relay coil (B
1) end is connected a bit (f) of B phase, the other end with often start the 3rd contact (c) that disconnects the pass and cooperate; Often start and disconnect the 4th contact (d) and ac contactor coil (B of closing
2) an end match ac contactor coil (B
2) the other end connect C phase a bit (g); At a bit (e) of above-mentioned A phase, a bit (f) of B phase is provided with by ac contactor coil (B between a bit (g) of C phase and the load
2) control the first switch (B
2K
11), second switch (B
2K
12), the 3rd switch (B
2K
13); As relay coil (B
1) when working, often start second contact (b) and the 4th contact (d) first contact (a) and the 3rd contact (c) closed, the left side of disconnecting the right side of closing and disconnect; As relay coil (B
1) during power down, often start second contact (b) and the 4th contact (d) disconnection of disconnecting the right side of closing.
2. three-phase alternating current motor protector according to claim 1 is characterized in that, at the 3rd switch (B
2K
13) with load between be connected in series current coil (B
3), this current coil (B
3) disconnect pass (B with Chang Hedong
3K
1) match, described often closing disconnects pass (B
3K
1) be serially connected in the end points and the ac contactor coil (B that match with the 4th contact (d)
2) between, form tie breaker.
3. three-phase alternating current motor protector according to claim 2 is characterized in that microcontactor and tie breaker are flat, is embedded at the left and right sides face of A.C. contactor main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100237193A CN100375361C (en) | 2004-03-05 | 2004-03-05 | Three-phase A.C. dynamo protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100237193A CN100375361C (en) | 2004-03-05 | 2004-03-05 | Three-phase A.C. dynamo protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1560977A CN1560977A (en) | 2005-01-05 |
| CN100375361C true CN100375361C (en) | 2008-03-12 |
Family
ID=34441141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100237193A Expired - Fee Related CN100375361C (en) | 2004-03-05 | 2004-03-05 | Three-phase A.C. dynamo protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100375361C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742731A (en) * | 2019-01-17 | 2019-05-10 | 张年宝 | A kind of A.C. contactor from carrying coil short protection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87209624U (en) * | 1987-06-27 | 1988-10-26 | 杨全 | Automatic protective device for safety operation of amotor |
| CN2073184U (en) * | 1990-08-07 | 1991-03-13 | 周天飞 | Open-phase protector for three-phase motor |
| CN2079823U (en) * | 1990-12-28 | 1991-06-26 | 曹志仁 | Loss of phase protecting ac contactor for motor |
| JP2002142355A (en) * | 2000-10-30 | 2002-05-17 | Tsubakimoto Chain Co | Overload protective device and reduction gear therewith |
-
2004
- 2004-03-05 CN CNB2004100237193A patent/CN100375361C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87209624U (en) * | 1987-06-27 | 1988-10-26 | 杨全 | Automatic protective device for safety operation of amotor |
| CN2073184U (en) * | 1990-08-07 | 1991-03-13 | 周天飞 | Open-phase protector for three-phase motor |
| CN2079823U (en) * | 1990-12-28 | 1991-06-26 | 曹志仁 | Loss of phase protecting ac contactor for motor |
| JP2002142355A (en) * | 2000-10-30 | 2002-05-17 | Tsubakimoto Chain Co | Overload protective device and reduction gear therewith |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1560977A (en) | 2005-01-05 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20080312 |