CN202076778U - Intelligent alternating current contactor system for motor protection - Google Patents
Intelligent alternating current contactor system for motor protection Download PDFInfo
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- CN202076778U CN202076778U CN2011201626442U CN201120162644U CN202076778U CN 202076778 U CN202076778 U CN 202076778U CN 2011201626442 U CN2011201626442 U CN 2011201626442U CN 201120162644 U CN201120162644 U CN 201120162644U CN 202076778 U CN202076778 U CN 202076778U
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- contactor
- motor
- electric current
- electric motor
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Abstract
The utility model relates to an intelligent alternating current contactor system for motor protection, which comprises an alternating current contactor. Electric current sensors (7) are respectively in serial connection onto fixed contacts of the alternating current contactor; the electric current sensors are respectively connected to electric current signal conditioning units; the electric current signal conditioning units are connected to a singlechip through an analog-to-digital converter; the singlechip is connected to an actuating mechanism through which an on/off state of a contactor coil (3) of the alternating current contactor is controlled; and the singlechip is further connected to a motor start delay regulating switch, an electric current protection fixed value regulating switch, an operation indicating lamp, a failure indicating lamp and a power source module for power supply. The intelligent alternating current contactor system for motor protection can monitor working states of a motor at any time, such as electric current, voltage, overcurrent, locked-rotor, short circuit, open phase and the like. The product has an inverse time-limit function, the time for opening a power source of the motor can be distinguished according to magnitude of the overcurrent; and in addition, the product has an electric current protection value regulating function and a motor start time regulating function.
Description
Technical field
The utility model relates to a kind of A.C. contactor, particularly, relates to a kind of electric motor protecting intelligent AC contactor system, belongs to the automatic resist technology of electrical automation and electrical equipment field.
Background technology
Existing A.C. contactor can only use as switch element, it not energy measurement do not possess the functions such as overcurrent, short circuit, phase shortage of protection electric equipment by the electric current of ac contactor contact, can't protect the safe operation of power equipment.
Particularly, traditional A.C. contactor mainly is made up of electromagnetic system, arc quenching system and mechanical part.When the contactor coil of A.C. contactor is switched on; the closing of contact of A.C. contactor; powering load; cut-out is to the contactor coil power supply of A.C. contactor; the contact of A.C. contactor separates under the tension force of spring; cut off the power supply of load; therefore existing A.C. contactor only plays a common on/off effect; by the A.C. contactor of the prior art, can't know size by the electric current of A.C. contactor, whether electric current phase shortage; under the motor overload state, can not protect motor; once motor overload or electric current phase shortage will be burnt motor in very short time, cause very big economic loss.
In addition, at present be used to protect the device of motor in the prior art, be made up of a plurality of elements such as air switch, thermal relay, motor protecters usually, it is uneconomical, wiring is cumbersome, greatly take the space of control device.
Therefore, if design a kind of A.C. contactor, it not only can be used as switch element, and can play the effect of protection motor, this will be a great technical progress for machine field.
The utility model content
The purpose of this utility model provides a kind of electric motor protecting intelligent AC contactor system; to overcome the above-mentioned defective of prior art; this electric motor protecting not only can use as switch element with the intelligent AC contactor system; and can realize protective effect to motor effectively, ensure the safe operation of motor.
Above-mentioned purpose is achieved through the following technical solutions: electric motor protecting intelligent AC contactor system; comprise A.C. contactor; be serially connected with current sensor on the fixed contact of this A.C. contactor respectively; this current sensor is connected to current signal conditioning unit; this current signal conditioning unit is connected in single-chip microcomputer via analog to digital converter; this single-chip microcomputer is connected in actuator and passes through the power on/off state of the contactor coil of the described A.C. contactor of this actuating mechanism controls, and described single-chip microcomputer also is connected in electric motor starting and postpones to adjust switch; the current protection definite value is adjusted switch; run indicator; malfunction indicator lamp and the power module that is used to power.
Selectively, the contactor coil of described A.C. contactor comprises additional secondary winding, and described power module is connected in this additional secondary winding.
Selectively, described electric motor starting postpones to adjust switch and current protection definite value to adjust switch is two two plucking number sign switches.
By technique scheme, the utility model has kept A.C. contactor former state and installation dimension, and it can monitor the operating state of motor at any time, as electric current, voltage, overcurrent, stall, short circuit, phase shortage etc.This product has the inverse time lag function; disconnect the time of motor power according to the overcurrent size discrimination; in addition; it postpones to adjust switch by electric motor starting and the current protection definite value is adjusted switch; adjusting function when having current protection value adjustment function and electric motor starting can be set the protection value according to the size of power of motor, can set the start-up time of motor according to the power of motor size; the utility model applied range has higher Technological Economy and is worth.
Description of drawings
Fig. 1 is the syndeton block diagram of the electric motor protecting of the utility model embodiment with the intelligent AC contactor system;
Fig. 2 is the schematic perspective view of the upper shell of A.C. contactor;
Fig. 3 is the schematic perspective view of the lower house of A.C. contactor;
Fig. 4 is the moving contact of A.C. contactor and the three-dimensional scheme of installation of fixed contact;
Fig. 5 is the schematic perspective view of the arc-extinguish chamber of A.C. contactor;
Fig. 6 is for being equipped with the schematic perspective view of additional secondary winding on the contactor coil;
Fig. 7 is the typical circuit schematic diagram of current sensor and current signal conditioning unit;
Fig. 8 is the typical circuit schematic diagram of power module;
Fig. 9 is the typical wiring schematic diagram of single-chip microcomputer;
Figure 10 postpones to adjust the principle schematic of switch and current protection definite value adjustment switch for electric motor starting;
Figure 11 is the typical circuit schematic diagram of actuator;
Figure 12 and Figure 13 are respectively the typical circuit schematic diagram of malfunction indicator lamp and run indicator.
Among the figure: 1 upper shell; 2 lower houses; 3 contactor coils; 4 springs; 5 moving contacts; 6 fixed contacts; 7 current sensors; 8 arc-extinguish chambers; 9 additional secondary winding.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model electric motor protecting with the intelligent AC contactor system described.
Referring to shown in Figure 1; electric motor protecting of the present utility model comprises A.C. contactor with the intelligent AC contactor system; be serially connected with current sensor 7 respectively on the fixed contact 6 of this A.C. contactor; this current sensor 7 is connected in current signal conditioning unit; this current signal conditioning unit is connected in single-chip microcomputer via analog to digital converter; this single-chip microcomputer is connected in actuator and passes through the power on/off state of the contactor coil 3 of the described A.C. contactor of this actuating mechanism controls, and described single-chip microcomputer also is connected in electric motor starting and postpones to adjust switch; the current protection definite value is adjusted switch; run indicator; malfunction indicator lamp and the power module that is used to power.
Above-mentioned power module is mainly used in to electric motor protecting and supplies electric current stably with the associated electronic components of intelligent AC contactor system, and it can comprise relevant rectification circuit, and can adopt independently supply line, and this is known for those skilled in the art.But preferably, the contactor coil 3 of above-mentioned A.C. contactor comprises additional secondary winding 9, and described power module is connected in this additional secondary winding 9.
Below simple each element of describing the utility model electric motor protecting with the intelligent AC contactor system; need to prove; major technique design of the present utility model is to form above-mentioned electric motor protecting intelligent AC contactor system by the syndeton between the above-mentioned element; and do not lie in this electric motor protecting element with the intelligent AC contactor system; to those skilled in the art; although may know each element, this can not influence creativeness of the present utility model.Therefore; in following simple description to each element only is for proving absolutely that the utility model carries out the exemplary description in ground; in fact those skilled in the art can expect the known circuits of multiple malformation or same function; therefore; protection range of the present utility model is not limited to the concrete structure of element shown in the accompanying drawing, and should comprise well-known to those skilled in the art all be equal to or variant.
As mentioned above; electric motor protecting of the present utility model comprises A.C. contactor with the intelligent AC contactor system; this A.C. contactor is the common A.C. contactor of prior art; referring to Fig. 2 to Fig. 5; known ground; it is mainly by upper shell 1; lower house 2; arc-extinguish chamber 8; moving contact 5; fixed contact 6; contactor coil 3; spring 4 grades assemble; especially; be serially connected with current sensor respectively on the fixed contact 6 of this A.C. contactor; that is to say; on the fixed contact 6 of the three-phase line of A.C. contactor, be serially connected with current sensor 7 respectively; it is A phase current transducer; B phase current transducer and C phase current transducer; described current sensor 7 obtains current signal; and (current signal conditioning unit comprises the current signal modulate circuit to pass the signal along to the conditioning of carrying out current signal in current signal conditioning unit; this is a current sample field circuit commonly used); relevant circuit diagram can be referring to Fig. 7; need to prove at this; Fig. 7 and following relevant circuit diagram only are to be a whole set of typical circuit form of implementation of setting forth and understanding exemplifies; the component units circuit of relevant this whole series circuit; it may occur to persons skilled in the art that multiple known distortion circuit or replacement circuit; these known distortion or be equal to substitute and belong to protection range of the present utility model equally; in addition; related symbol in all circuit diagrams of the present utility model only indicates for connecting circuit; its role is to show the wiring relation between each component units circuit; this knows for those skilled in the art, below gives unnecessary details no longer especially.
Be equipped with additional secondary winding 9 on the contactor coil 3 of above-mentioned A.C. contactor, this additional secondary winding 9 mainly is connected in power module of the present utility model, and so that electric power transfer is arrived power module, the typical circuit form of relevant power module is referring to Fig. 8.In addition, the connection type of relevant single-chip microcomputer can be referring to Fig. 9, and Figure 10 shows that electric motor starting postpones to adjust switch and the current protection definite value is adjusted switch, and particularly, it is two two plucking number sign switches.Figure 11 shows the typical circuit version of above-mentioned actuator, and the J5 among the figure represents the contactor coil 3 that connects.Figure 12 and Figure 13 then represent to be connected in the malfunction indicator lamp and the run indicator of single-chip microcomputer respectively.
The new novel operation principle of this practicality is: the quiet joint 6 of all of above-mentioned A.C. contactor all is installed with the promptly conventional AC type current sensor of current sensor 7(); be that current sensor connects 7 in A.C. contactor three-phase main contacts loop, at first preset the starting time of protected motor and the magnitude of current of protection motor.The energized starter motor; when A.C. contactor energising work; the additional secondary winding 9 of contactor coil 3 just has an alternating voltage supply power module; through rectification and voltage stabilizing; as the working power of electric motor protecting of the present utility model with the associated electronic components of intelligent AC contactor system; motor three-phase electricity flow valuve is by the current sensor of string at A.C. contactor; output signal to current signal conditioning unit; the analog quantity of current signal conditioning unit sends single-chip microcomputer to via analog to digital converter; single-chip microcomputer is judged the size of current value and phase shortage whether; according to testing result; whether the single-chip microcomputer actuator that gives an order cuts off the inductance of contactor coil 3, realizes the adhesive and the disconnection of A.C. contactor.
Electric motor protecting of the present utility model intelligent AC contactor system, carries out, presets all in A.C. contactor inside none any peripheral cell at its all sensings, measurement, calculating, analysis, control.This electric motor protecting can detect size of current by A.C. contactor, phase shortage whether with the intelligent AC contactor system; size according to load; can accurately judge whether to exist phenomenons such as overload, overcurrent, short circuit; overload protection also has the time limit defencive function simultaneously; implement to cut off load power source according to fault state, protection motor and the operation of various payload security.Therefore, the utility model modern design, intelligent degree height can be protected the safe operation of motor and various electric equipments reliably.Particularly, the utlity model has following advantage: the first, signal sampling: adopt (being on the fixed contact of A.C. contactor) extraction current signal source in high accuracy, no saturated, volume is little, jamproof current sensor is serially connected in A.C. contactor the major loop.The second, reliable working power: the working power of electronic devices and components provides a safe and reliable working power by additional secondary winding 9 on the contactor coil of A.C. contactor self.The 3rd; multi-functional: prior art is formed protection systems for general circuit breaker, thermal relay, A.C. contactor, the motor protecter etc. of adopting of motor operation, and the utility model adopts electric motor protecting can realize protection to motor with device of intelligent AC contactor system.The 4th, volume is little: electric motor protecting is the same with former A.C. contactor volume with the intelligent AC contactor system, has saved the space that other element is connected with element in actual applications.The 5th, reliability height: only need connect electric motor protecting in the primary circuit and get final product, save the contact that other element connects, improve the reliability of system with the intelligent AC contactor system.
By last description as seen, the utility model has kept A.C. contactor former state and installation dimension, and it can monitor the operating state of motor at any time, as electric current, voltage, overcurrent, stall, short circuit, phase shortage etc.This product has the inverse time lag function; disconnect the time of motor power according to the overcurrent size discrimination; in addition; it postpones to adjust switch by electric motor starting and the current protection definite value is adjusted switch; adjusting function when having current protection value adjustment function and electric motor starting can be set the protection value according to the size of power of motor, can set the start-up time of motor according to the power of motor size; the utility model applied range has higher Technological Economy and is worth.
Each concrete technical characterictic described in above-mentioned embodiment can carry out combination in any by any suitable manner, and it falls within the scope disclosed in the utility model equally.Simultaneously, also can carry out combination in any between the various execution mode of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.In addition; the utility model is not limited to the detail in the above-mentioned execution mode; in technical conceive scope of the present utility model, can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection range of the present utility model.Protection range of the present utility model is defined by the claims.
Claims (3)
1. electric motor protecting intelligent AC contactor system; it is characterized in that; comprise A.C. contactor; be serially connected with current sensor (7) on the fixed contact of this A.C. contactor (6) respectively; this current sensor (7) is connected to current signal conditioning unit; this current signal conditioning unit is connected in single-chip microcomputer via analog to digital converter; this single-chip microcomputer is connected in actuator and passes through the power on/off state of the contactor coil (3) of the described A.C. contactor of this actuating mechanism controls, and described single-chip microcomputer also is connected in electric motor starting and postpones to adjust switch; the current protection definite value is adjusted switch; run indicator; malfunction indicator lamp and the power module that is used to power.
2. electric motor protecting according to claim 1 intelligent AC contactor system is characterized in that the contactor coil of described A.C. contactor (3) comprises additional secondary winding (9), and described power module is connected in this additional secondary winding (9).
3. electric motor protecting according to claim 1 intelligent AC contactor system is characterized in that, described electric motor starting postpones to adjust switch and current protection definite value, and to adjust switch be two two plucking number sign switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201626442U CN202076778U (en) | 2011-05-20 | 2011-05-20 | Intelligent alternating current contactor system for motor protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201626442U CN202076778U (en) | 2011-05-20 | 2011-05-20 | Intelligent alternating current contactor system for motor protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202076778U true CN202076778U (en) | 2011-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201626442U Expired - Fee Related CN202076778U (en) | 2011-05-20 | 2011-05-20 | Intelligent alternating current contactor system for motor protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202076778U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429103A (en) * | 2015-12-31 | 2016-03-23 | 温州佳华仪表电气科技有限公司 | Three-phase motor protector |
| CN110867820A (en) * | 2019-11-15 | 2020-03-06 | 陕西航空电气有限责任公司 | Alternating current intelligent contactor system adaptive to multi-specification load current |
-
2011
- 2011-05-20 CN CN2011201626442U patent/CN202076778U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429103A (en) * | 2015-12-31 | 2016-03-23 | 温州佳华仪表电气科技有限公司 | Three-phase motor protector |
| CN110867820A (en) * | 2019-11-15 | 2020-03-06 | 陕西航空电气有限责任公司 | Alternating current intelligent contactor system adaptive to multi-specification load current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20111214 Termination date: 20130520 |