CN205016994U - Motor open -phase protection circuit - Google Patents
Motor open -phase protection circuit Download PDFInfo
- Publication number
- CN205016994U CN205016994U CN201520656958.6U CN201520656958U CN205016994U CN 205016994 U CN205016994 U CN 205016994U CN 201520656958 U CN201520656958 U CN 201520656958U CN 205016994 U CN205016994 U CN 205016994U
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- CN
- China
- Prior art keywords
- make contact
- auxiliary relay
- contactor
- phase
- motor
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Abstract
The utility model belongs to the technical field of the motor resist technology and specifically relates to a motor open -phase protection circuit. It includes auxiliary relay, ac contactor, second high score air switch automatic absolutely and third high score air switch automatic absolutely, and wherein auxiliary relay and second high score air switch automatic absolutely, third high score air switch automatic absolutely constitute the important step of open -phase protection circuit. The utility model discloses the quick disengagement failure of ability alleviates the destruction degree of breaking current to electrical equipment when the motor takes place open phase fault, in addition, this protection circuit is in at any time prepares operate condition, in case its protection zone breaks down or when abnormal can and accurate action often, have that the circuit distribution is easy, to occupy the space little, economically feasible, advantages such as the high and convenient maintenance of easy operation of reliability can be applied to the three phase machine and control and pull among the open -phase protection of circuit.
Description
Technical field
The utility model relates to Protection Technology for Motors field, especially a kind of motor open-phase protection circuit.
Background technology
Power supply is often there is and to break the fault of phase in asynchronous motor in running, this is mainly because the fuse blows of a certain phase causes, in addition external power source break phase, A.C. contactor certain a pair main contacts bad, wiring loosens and motor winding inside open circuit, also may cause disconnected to ensure mutually.Break and occur negative sequence component afterwards mutually, positive sequence symmetrical voltage and negative phase-sequence symmetrical voltage produce the contrary rotating magnetic field of two direction of rotation respectively, and the negative sequence field that negative-sequence current excites makes output power of motor and electromagnetic torque decline.When zero load or underloading, power supply breaks mutually, and motor generally can not be out of service, but remaining two-phase load current obviously increases.If break phase during heavy duty, the maximum output torque of disconnected rear motor mutually, motor will constantly slow down, until stall.According to statistics, in the fault of burning of winding of asynchronous motor, 70 more than ﹪ are broken by power supply and cause mutually, are therefore necessary to arrange reliable open phase protection measure.
Although have a lot of thermal relay at present with open phase protection, even if be not with open phase protection, to a certain degree also can protect mutually disconnected.But its action sensitivity and actual effect still can not be satisfactory, especially for some small-sized motor, price is higher by comparison for a thermal relay, has so just had influence on the application of thermal relay in miniature motor.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of wiring harness simple, use that cost is low, sensitivity and the high motor open-phase protection circuit of reliability.
To achieve these goals, the utility model adopts following technical scheme:
A kind of motor open-phase protection circuit, it comprises A.C. contactor, auxiliary relay, the second air automatic switch and the 3rd air automatic switch;
One end of described A.C. contactor be serially connected with successively thermal relay contact, described auxiliary relay the second make contact and be connected on power supply phase line L3 by described second air automatic switch, the other end of described A.C. contactor is serially connected with the first make contact of push-button switch break contact, push-button switch make contact and described auxiliary relay successively and is connected on power supply phase line L2 by described second air automatic switch;
Be connected between described push-button switch break contact and push-button switch make contact after first make contact of described auxiliary relay is connected in series the first make contact of described A.C. contactor and the 3rd make contact of auxiliary relay successively;
One end of described auxiliary relay is connected between the first make contact of described A.C. contactor and the 3rd make contact of auxiliary relay, the other end is connected on power supply phase line L1 by the 3rd air automatic switch;
Second make contact one end described 3rd air automatic switch of serial connection of described A.C. contactor is connected on power supply phase line L3, the other end is connected between the second make contact of described auxiliary relay and thermal relay contact.
Preferentially, described second air automatic switch and the 3rd air automatic switch are high breaking small air automatic switch.
Owing to have employed such scheme, the utility model utilizes the important step of an auxiliary relay and two high breaking air automatic switch formation motor protecting circuits, when motor generation open phase fault, energy fast shut-off fault, alleviates the destructiveness of breaking current to electric equipment; In addition; this protective circuit is in warming-up exercise state at any time; break down once its protection zone or abnormal can action in time and accurately; have wiring harness easily, to occupy space little; economically feasible; high and the advantages such as maintenance simple to operation of reliability, can be applicable to three phase electric machine and control to drag in the open phase protection of circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, a kind of motor open-phase protection circuit of the present embodiment, it comprises A.C. contactor KM, auxiliary relay K1, the second air automatic switch S2 and the 3rd air automatic switch S3;
One end of A.C. contactor KM be serially connected with successively thermal relay contact K0, auxiliary relay the second make contact K1-2 and be connected on power supply phase line L3 by the second air automatic switch S2, the other end of A.C. contactor KM is serially connected with the first make contact K1-1 of push-button switch break contact SB1, push-button switch make contact SB2 and auxiliary relay K1 successively and is connected on power supply phase line L2 by the second air automatic switch S2;
Be connected between push-button switch break contact SB1 and push-button switch make contact SB2 after the first make contact K1-1 of auxiliary relay K1 is connected in series the first make contact KM-1 of A.C. contactor KM and the 3rd make contact K1-3 of auxiliary relay K1 successively;
One end of auxiliary relay K1 is connected between the first make contact KM-1 of A.C. contactor KM and the 3rd make contact K1-3 of auxiliary relay K1, the other end is connected on power supply phase line L1 by the 3rd air automatic switch S3;
Between second make contact KM-2 one end serial connection the 3rd second make contact K1-2 that air automatic switch S3 is connected on power supply phase line L3, the other end is connected to auxiliary relay K1 and thermal relay contact KO of A.C. contactor KM, the driving element FR of thermal relay is connected with motor M.
Second air automatic switch S2 and the 3rd air automatic switch S3 is high breaking small air automatic switch.
The operation principle of the present embodiment is: 1) start, close three pole knife switch S1 and air automatic switch S1 and air automatic switch S2, and then press the button switch make contact SB2, now A.C. contactor KM coil obtains electric.Loop is now: L2 → K1-1 → SB2 → SB1 → KM → K0 → L3, because A.C. contactor is powered, motor M starts, simultaneously the first make contact K1-1 of auxiliary relay and the second make contact K1-2 also connects, again because auxiliary relay K1 is powered, the first make contact K1-1, the second make contact K1-2 of auxiliary relay K1 and the 3rd make contact K1-3 also action thereupon.2) operate, release button switch make contact SB2.Loop is now: L2 → K1-3 → SB1 → KM → KO → KM-2 → L3, and major loop is in normal operating state.3) stop, pressing the button switch break contact SB1, A.C. contactor KM loop is cut off, and the main contact K of A.C. contactor KM discharges, and motor M quits work.
The error protection course of work is: 1) when power supply phase line L1 phase shortage dead electricity, now auxiliary relay K1 dead electricity and action, the 3rd make contact K1-3 of auxiliary relay K1 is returned to often open, cut off AC relay KM loop and make release, motor M quits work; 2) when power supply phase line L2 phase shortage dead electricity, A.C. contactor KM is discharged, and motor M quits work; 3) when power supply phase line L3 is without electricity, A.C. contactor KM is without loop, and master returns to be cut off, and motor M is quit work.Thus the effect played motor M open phase protection.
The wiring harness of the present embodiment is easy, and occupy space little, economically feasible, simple to operate easy to maintenance, when motor generation open phase fault, fast shut-off fault can alleviate the destructiveness of breaking current to electric equipment, has the feature of rapidity; This circuit is in warming-up exercise state at any time in addition, breaks down or irregular operating can action in time and accurately once protection zone, improves reliability.Can be applicable to three phase electric machine control to drag in the open phase protection of circuit.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (2)
1. a motor open-phase protection circuit, is characterized in that: it comprises A.C. contactor, auxiliary relay, the second air automatic switch and the 3rd air automatic switch;
One end of described A.C. contactor be serially connected with successively thermal relay contact, described auxiliary relay the second make contact and be connected on power supply phase line L3 by described second air automatic switch, the other end of described A.C. contactor is serially connected with the first make contact of push-button switch break contact, push-button switch make contact and described auxiliary relay successively and is connected on power supply phase line L2 by described second air automatic switch;
Be connected between described push-button switch break contact and push-button switch make contact after first make contact of described auxiliary relay is connected in series the first make contact of described A.C. contactor and the 3rd make contact of auxiliary relay successively;
One end of described auxiliary relay is connected between the first make contact of described A.C. contactor and the 3rd make contact of auxiliary relay, the other end is connected on power supply phase line L1 by the 3rd air automatic switch;
Second make contact one end described 3rd air automatic switch of serial connection of described A.C. contactor is connected on power supply phase line L3, the other end is connected between the second make contact of described auxiliary relay and thermal relay contact.
2. a kind of motor open-phase protection circuit as claimed in claim 1, is characterized in that: described second air automatic switch and the 3rd air automatic switch are high breaking small air automatic switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520656958.6U CN205016994U (en) | 2015-08-28 | 2015-08-28 | Motor open -phase protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520656958.6U CN205016994U (en) | 2015-08-28 | 2015-08-28 | Motor open -phase protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205016994U true CN205016994U (en) | 2016-02-03 |
Family
ID=55215578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520656958.6U Expired - Fee Related CN205016994U (en) | 2015-08-28 | 2015-08-28 | Motor open -phase protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205016994U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106144977A (en) * | 2016-08-15 | 2016-11-23 | 湖南五新隧道智能装备股份有限公司 | A kind of tunnel arch Operation Van electrical system and tunnel arch Operation Van |
-
2015
- 2015-08-28 CN CN201520656958.6U patent/CN205016994U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106144977A (en) * | 2016-08-15 | 2016-11-23 | 湖南五新隧道智能装备股份有限公司 | A kind of tunnel arch Operation Van electrical system and tunnel arch Operation Van |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 Termination date: 20160828 |