CN202651768U - Phase lack detection and protection system for three-phase motors - Google Patents
Phase lack detection and protection system for three-phase motors Download PDFInfo
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- CN202651768U CN202651768U CN 201220220706 CN201220220706U CN202651768U CN 202651768 U CN202651768 U CN 202651768U CN 201220220706 CN201220220706 CN 201220220706 CN 201220220706 U CN201220220706 U CN 201220220706U CN 202651768 U CN202651768 U CN 202651768U
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Abstract
The utility model discloses a phase lack detection and protection system for three-phase motors, comprising a detection circuit, a judgment circuit and a switching circuit, wherein the judgment circuit receives signals of the detection circuit, and the switching circuit receives judgment signals and controls the motion of a motor. By using the judgment circuit to judge a three-phase circuit of the motor and controlling the motion of the motor according to whether there is a current signal in the judgment circuit, the purpose of high-efficiency three-phase motor detection and protection is achieved; and the adoption of a sensing element in judgment making can be conducive to lower cost and high sensitivity.
Description
Technical field
The utility model relates to the electric motor protecting field, particularly, relates to a kind of Three-phase electric motor phase and detects and protection system.
Background technology
Along with being widely used of cleaning electric energy, motor is as a kind of important machinery that converts electrical energy into mechanical energy, be widely used, but motor the fault of phase shortage often occurs when routine use, and existing check circuit mainly adopts complicated intelligent check system, cost is higher, maintenance difficult is not used widely, so the spoilage of motor is very high.
The utility model content
Being of the utility model technology for the problems referred to above, proposes a kind of Three-phase electric motor phase and detects and protection system, with realize high efficiency, circuit is simple, easy to maintenance, low-cost and the advantage of highly sensitive detection protection three phase electric machine.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of Three-phase electric motor phase detects and protection system, comprises testing circuit, decision circuitry and switching circuit, described decision circuitry test-accepting circuit signal, and described switching circuit is accepted this judgement signal and is controlled motor action.
Further, described testing circuit comprises magnetic test coil LA, LB, LC, rectification circuit VQ1, VQ2, VQ3 and light-emitting component VA1, VB1, VC1, VA, VB, VC, described magnetic test coil LA, rectification circuit VQ1, light-emitting component VA1 and light-emitting component VA are connected in parallel, described magnetic test coil LB, rectification circuit VQ2, light-emitting component VB1 and light-emitting component VB are connected in parallel, described magnetic test coil LC, rectification circuit VQ3, light-emitting component VC1 and light-emitting component VC are connected in parallel, and above-mentioned three parallel circuitss are connected electrically on the three phase mains of motor.
Further, described decision circuitry and switching circuit comprise photo-sensitive cell VA2, VB2, VC2, triode VDS, diode VD02, rectification circuit VQ4 and decompression capacitor C01, described photo-sensitive cell VA2, VB2, VC2 is cascaded, and accept respectively above-mentioned light-emitting component VA1, VB1, the light signal of VC1, described switch triode VDS, will be by photo-sensitive cell VA2, VB2, the resistance variations of VC2, come conducting and the cut-off of control switch pipe, described rectification circuit VQ4, capacitor C 01 and diode VD02 form power-supply circuit, provide power supply to switching circuit.
The technical solution of the utility model is whether three-phase current to be arranged by judging with motor, comes the work of control switch circuit; realized the purpose of highly sensitive detection protection three phase electric machine; and adopt photo-sensitive cell to judge, and reduced cost, improved sensitivity.
The utility model further feature and advantage will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the utility model.The purpose of this utility model and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Accompanying drawing is used to provide further understanding of the present utility model, and consists of the part of specification, is used from explanation the utility model with embodiment one of the present utility model, does not consist of restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the electrical circuit diagram of the described Three-phase electric motor phase detection of the utility model embodiment and protection system.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Three-phase electric motor phase detects and protection system, comprises testing circuit, decision circuitry and switching circuit, and decision circuitry test-accepting circuit signal, switching circuit are accepted this judgement signal and controlled motor action.
Wherein, testing circuit comprises magnetic test coil LA, LB, LC, rectification circuit VQ1, VQ2, VQ3 and light-emitting component VA1, VB1, VC1, VA, VB, VC.Magnetic test coil LA, rectification circuit VQ1, light-emitting component VA1 and light-emitting component VA are connected in parallel, and form a detecting unit, and wherein whether VA is used to refer to A and works mutually.Magnetic test coil LB, rectification circuit VQ2, light-emitting component VB1 and light-emitting component VB are connected in parallel, and form a detecting unit, and wherein whether VB is used to refer to B and works mutually.Magnetic test coil LC, rectification circuit VQ3, light-emitting component VC1 and light-emitting component VC are connected in parallel, and form a detecting unit, and wherein whether VC is used to refer to C and works mutually.Three-phase power line passes respectively LA, LB, LC is unshakable in one's determination.Described decision circuitry by photo-sensitive cell VA2, VB2, VC2, form, described photo-sensitive cell VA2, VB2, VC2 are cascaded, and accept respectively the light signal of above-mentioned light-emitting component VA1, VB1, VC1, switch triode VDS, will be by the resistance signal of photo-sensitive cell VA2, VB2, VC2, come conducting and the cut-off of control switch pipe, rectification circuit VQ4, capacitor C 01 and diode VD02 built-up circuit power-supply circuit.
Its operation principle is: when actuating motor normally moves, relay K M is closed, motor normally moves, three-phase circuit namely has electric current to pass through, induction coil LA, LB, LC produce induced voltage, after rectification circuit VQ1, VQ2, VQ3 rectification, drive light-emitting component VA1, VB1, VC1, VA, VB, VC luminous, the switching circuit electric energy has the capacitance decompression rectification that is connected on the power supply to supply with.After photo-sensitive cell VA2, VB2, VC2 were subject to photoinduction, three photoinduction element internal resistances reduced, the transistor switching circuit conducting, and the conducting of relay coil J adhesive motor control loop, motor normally moves.When three phase mains lacks a phase time, phase shortage circuit no current, induction coil does not produce induced voltage, and luminous tube extinguishes, and the photo-sensitive cell internal resistance reaches hundreds of kilo-ohm, the transistor switching circuit cut-off, relay coil J discharges, and cuts off the KM path, so that motor is out of service.Light-emitting component VA1, VB1, VC1 have a phase not luminous; can judge by which by sensitive piece and to cause fault; after photo-sensitive cell VA2, VB2, VC2 have one not receive photoinduction mutually; the photoinduction element internal resistance increases; because three photo-sensitive cells are series connection; when a not conducting of photo-sensitive cell is arranged; transistor switching circuit namely ends; relay coil J namely discharges; corresponding cut-out Electric Machine Control relay K M loop; realization has protected motor under the phase shortage condition to the control of motor, the purpose of not powering when prosthetic is intervened.
In sum; the utlity model has following effect: 1) adopt induction coil to produce the mode of induced voltage, improved accuracy, no matter externally fed circuit phase shortage; or when opening circuit the open-phase fault that reason causes because of motor internal, protective circuit all can be responded to and starting protection control.2) can in time judge disconnected is by which to be caused mutually, has shortened the time for fixing a breakdown.3) highly sensitive.4) reliability is high, and ordinary skilled artisan can be overhauled, and adopts element to be the low-down electric elements of failure rate, and the probability of the fault that protective circuit self occurs is very low.
It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although with reference to previous embodiment the utility model is had been described in detail, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (3)
1. a Three-phase electric motor phase detects and protection system, it is characterized in that, comprises testing circuit, decision circuitry and switching circuit, described decision circuitry test-accepting circuit signal, and described switching circuit is accepted this judgement signal and is controlled motor action.
2. Three-phase electric motor phase according to claim 1 detects and protection system; it is characterized in that; described testing circuit comprises magnetic test coil LA; LB; LC; rectification circuit VQ1; VQ2; VQ3 and light-emitting component VA1; VB1; VC1; VA; VB; VC; described magnetic test coil LA; rectification circuit VQ1; light-emitting component VA1 and light-emitting component VA are connected in parallel; described magnetic test coil LB; rectification circuit VQ2; light-emitting component VB1 and light-emitting component VB are connected in parallel; described magnetic test coil LC; rectification circuit VQ3; light-emitting component VC1 and light-emitting component VC are connected in parallel, and above-mentioned three parallel circuitss are connected electrically on the three phase mains of motor.
3. Three-phase electric motor phase according to claim 2 detects and protection system; it is characterized in that; described decision circuitry and switching circuit comprise photo-sensitive cell VA2; VB2; VC2; triode VDS; diode VD02; rectification circuit VQ4 and capacitor C 01; described photo-sensitive cell VA2; VB2; VC2 is cascaded; and accept respectively above-mentioned light-emitting component VA1; VB1; the light signal of VC1; described switch triode VDS; will be by photo-sensitive cell VA2; VB2; the resistance variations of VC2; come conducting and the cut-off of control switch pipe; described rectification circuit VQ4; decompression capacitor C01 and diode VD02 form power-supply circuit, provide power supply to switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220706 CN202651768U (en) | 2012-05-16 | 2012-05-16 | Phase lack detection and protection system for three-phase motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220220706 CN202651768U (en) | 2012-05-16 | 2012-05-16 | Phase lack detection and protection system for three-phase motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651768U true CN202651768U (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220220706 Expired - Fee Related CN202651768U (en) | 2012-05-16 | 2012-05-16 | Phase lack detection and protection system for three-phase motors |
Country Status (1)
| Country | Link |
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| CN (1) | CN202651768U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093608A (en) * | 2016-08-09 | 2016-11-09 | 湖北泰和电气有限公司 | Three phase alternating current motor detection device for phase sequence |
| CN109962460A (en) * | 2019-04-25 | 2019-07-02 | 余臣奎 | A kind of open phases of three-phase power source protection circuit and its phase failure protection method |
-
2012
- 2012-05-16 CN CN 201220220706 patent/CN202651768U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093608A (en) * | 2016-08-09 | 2016-11-09 | 湖北泰和电气有限公司 | Three phase alternating current motor detection device for phase sequence |
| CN109962460A (en) * | 2019-04-25 | 2019-07-02 | 余臣奎 | A kind of open phases of three-phase power source protection circuit and its phase failure protection method |
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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: 20130102 Termination date: 20140516 |