CN2388759Y - Motor protection - Google Patents

Abstract

The utility model relates to a protector for motors. The utility model is characterized in that a circuit board (2) is arranged in a casing (1) which is made of insulation material; the casing (1) and the circuit board (2) are corresponding carved with three holes A, B, and C; holes of coils L1, L2 and L3 are engaged with the three holes A, B, and C; electronic components which are form a detection circuit, a control circuit, and an executive circuit are arranged on the circuit board (2), causing the circuit board (2) to be electrically connected; one end of an external conductor Y is connected with a point F and a point E of a bridge rectifier, and the other end extend to the outside of the rectangular casing (1). After the motors are arranged on the utility model, the utility model can prevent the motors from damaging.

Description

Motor protecting device

The utility model relates to a kind of protective device that motor burns of stopping, and especially can stop threephase motor burns motor because of the phase failure, overload protective device.

At present, known motor protecting device kind is more, and these existing motor protecting devices mostly are to make signal source with temperature-sensitive element, and the protective circuit that is equipped with other electronics unit, device composition again assembles.To touch mutually with protected motor as the temperature-sensitive element of signal source; the power supply of the protective circuit control motor that other electronics unit, device are formed; when motor because of the overload or phase failure adstante febre; temperature-sensitive element converts thermal signal to the signal of telecommunication and exports coupled protective circuit to; cut off the electricity supply, thereby play the effect of protecting motor.But these known motor protecting devices still have defective: the one, and low as the temperature-sensitive element sensitivity of signal source, and be subjected to ambient temperature, humidity effect, often produce the low motor that burns of misoperation or sensitivity.The 2nd, waste energy; Existing motor protecting device all needs working power, guaranteeing its operate as normal, thereby wastes energy.

The purpose of this utility model provides a kind of motor protecting device, and this motor protecting device can not only be stopped to burn phenomenon because of the phase failure, overload cause motor effectively, and not power consumption in the course of work, thereby energy savings.

The purpose of this utility model is to realize like this; make a kind of motor protecting device; this motor protecting device adopts electronics unit, device to form detection, control and executive circuit; be electrically connected between the unit of each circuit, the device; and it is installed in the rectangular enclosure made from insulating material, on rectangular enclosure, is carved with three holes.Three induction coils of the utility model testing circuit place place, three holes, the three-phase power line of motor passes from the hole, that is from three induction coils, pass, when the motor phase failure or overload, in induction coil, produce induced signal, this signal makes the control and the executive circuit that are electrically connected with it move, and cuts off the motor working power, thereby has avoided burning of motor.Electronics unit, the device of forming this device testing circuit, control and executive circuit all are installed on the wiring board, and wiring board places in the rectangular enclosure.Two lines of external connection Y, one end are electrically connected on the contact E and the contact F of the utility model bridge rectifier respectively, and the other end stretches out the outside of rectangular enclosure.The three-phase power line that needs only motor during use passes in three holes of square type shell, to stretch out rectangular enclosure outside external connection Y two lines wherein one be connected to wherein going up mutually of three-phase power line, other one is connected in other other by external A.C. contactor and goes up mutually and get final product.

Owing to taked technique scheme, replace thermal signal that temperature-sensitive element obtains as signal source with electrical signal of reaction, thereby this device sensitivity height, reliable operation.Behind this device of motor mounting, stopped motor effectively and burnt phenomenon, and not power consumption during the work of this device.

Further describe technical characterictic of the present utility model below in conjunction with accompanying drawing:

Fig. 1 is the power supply reason figure of an embodiment of the utility model.

Fig. 2 is the broken section structure chart of the utility model embodiment product.

Fig. 3 is the side broken section structure chart of Fig. 2.

As Fig. 1, Fig. 2, shown in Figure 3,1 among the figure is rectangular enclosure (box), and rectangular enclosure 1 is divided into base Z and loam cake G, is built-in with wiring board 2 at base Z, and electronics unit, device are installed on the wiring board 2, and the electrical connection of electronics unit, device as shown in Figure 1.Base Z, the loam cake G of rectangular enclosure 1 make by insulating material, are carved with A, B, three holes of C on the base Z of square type shell 1 and loam cake G and the wiring board 2 accordingly.Be fixed in the induction coil L on the wiring board 2 ₁, L ₂And L ₃Be hollow coil, its hollow and A, three holes of B, C coincide, so that the three phase mains of motor is passed from the hole.In circuit theory diagrams shown in Figure 1, L ₁, L ₂And L ₃Be induction coil, induction coil L ₁, L ₂And L ₃An end ground connection, its other end respectively with rectifier diode D ₁, D ₄And D ₇Positive pole join.Rectifier diode D ₁Negative pole simultaneously and filter capacitor C ₁, current-limiting resistance R ₁With isolating diode D ₂Positive pole join; Filter capacitor C ₁Other end ground connection.Current-limiting resistance R ₁Another termination transistor T ₁Base stage, isolating diode D ₂Negative pole then be connected in common wire a.Transistor T ₁Base stage connect current-limiting resistance R ₁, its grounded emitter, its collector electrode connects isolating diode D ₃Positive pole and current-limiting resistance R ₂An end, current-limiting resistance R ₂The other end be connected in common wire a, isolating diode D ₃Negative pole be connected to common wire b.Coil L ₁, rectifier diode D ₁, filter capacitor C ₁, current-limiting resistance R ₁And R ₂, transistor T ₁And isolating diode D ₃Be electrically connected, formed the wherein open-phase detection circuit of a phase of motor three phase mains; Simultaneously, by the coil L that is electrically connected ₁, rectifier diode D ₁, filter capacitor C ₁, every diode D ₂The overload detection circuit of having formed this phase.Equally, the coil L of electrical connection ₂, rectifier diode D ₄, filter capacitor C ₂, current-limiting resistance R ₃And R ₄, transistor T ₂, isolating diode D ₆Formed the wherein open-phase detection circuit of another phase of motor three phase mains; And by the coil L that is electrically connected ₂, rectifier diode D ₄, filter capacitor C ₂, isolating diode D ₅The overload detection circuit of having formed this phase.Again by coil L ₃, rectifier diode D ₇, filter capacitor C ₃, current-limiting resistance R ₅And R ₆, transistor T ₃, isolating diode D ₉Be electrically connected, formed the open-phase detection circuit of the other phase of motor three phase mains; And by coil L ₃, rectifier diode D ₇, filter capacitor C ₃, isolating diode D ₈Be electrically connected the back, formed this phase power supply overload detection circuit.Above-mentioned open-phase detection circuit and overload detection circuit have constituted testing circuit of the present utility model.Divider resistance R among Fig. 1 ₇And R ₈Form parallel circuit, divider resistance R ₇An end ground connection, divider resistance R ₈A termination common line a, resistance R ₇And R ₈Common port connect transistor T ₄Base stage and filter capacitor C ₄An end.Filter capacitor C ₄Other end ground connection.Transistor T ₄Emitter connect current-limiting resistance R ₉An end, its collector electrode connects common wire a, current-limiting resistance R ₉An end and transistor T ₄Emitter join, its other end is connected to common wire b.Current-limiting resistance R ₁₀A termination common wire b, its other end and filter capacitor C ₅And controllable silicon SR ₁Control extremely continuous.Divider resistance R ₇And R ₈, filter capacitor C ₄, transistor T ₄, current-limiting resistance R ₉And R ₁₀, filter capacitor C ₅Be electrically connected, formed control circuit of the present utility model.Can be by silicon SR ₁The control utmost point and current-limiting resistance R ₁₀, filter capacitor C ₅An end be connected its minus earth, anode and current-limiting resistance R ₁₁And controllable silicon SR ₂The control utmost point join.Current-limiting resistance R ₁₁The other end and controllable silicon SR ₂Anode be connected in jointly by rectifier diode D ₁₁, D ₁₂, D ₁₃And D ₁₄The output head anode of the bridge rectifier of forming.Controllable silicon SR ₂Negative electrode and isolating diode D ₁₀Positive pole link to each other isolating diode D ₁₀Negative pole with ground join.The rectifier diode D of bridge rectifier ₁₁And D ₁₂Plus earth, its negative pole meets rectifier diode D ₁₃And D ₁₄Positive pole; Simultaneously its contact E and another contact F join with the end of external connection Y respectively, and the other end of external connection Y links to each other with external circuit in use.Controllable silicon SR ₁And SR ₂, current-limiting resistance R ₁₁, isolating diode D ₁₀And bridge rectifier is electrically connected, has formed executive circuit of the present utility model.Under the normal condition, one energized, electric current is through the actuating coil of an A.C. contactor J contact E to bridge rectifier, and another contact F of bridge rectifier is also communicated with one of external power by line, and this moment, the voltage through the bridge rectifier rectification was added in controlled SR ₂With the isolating diode D that is attached thereto ₁₀, current-limiting resistance R ₁₁And the controllable silicon SR that is electrically connected with it ₁Two ends, because of controllable silicon SR ₁, SR ₂Be initially located in cut-off state, this voltage is through current-limiting resistance R ₁₁Give controllable silicon SR ₂The control utmost point one trigger voltage, make controllable silicon SR ₂Conducting also makes to be connected in controllable silicon SR ₂The isolating diode D of negative electrode ₁₀Conducting is because of controllable silicon SR ₂With isolating diode D ₁₀Resistance is very little after the conducting.Thereby the output both end voltage that makes bridge rectifier near and electric current is bigger, this electric current makes A.C. contactor J adhesive, the power supply of foreign minister's power supply bio-occlusion motor.Three-phase power line is respectively from A, the B that is fixed in rectangular enclosure 1, the coil L in three holes of C ₁, L ₂And L ₃After passing, produce induced voltage in coil, this induced voltage is respectively by rectifier diode D ₁, D ₄And D ₇After the rectification, through filter capacitor C ₁, C ₂And C ₃Filtering, on the one hand through current-limiting resistance R ₁, R ₃And R ₅To transistor T ₁, T ₂And T ₃Base stage, on the other hand by isolating diode D ₂, D ₅And D ₈To common line a, under induced current triggers, transistor T ₁, T ₂, T ₃Place's conducting state, its collector voltage is very low, the output of open-phase detection circuit no signal.Adjust divider resistance R ₇And R ₈Resistance, make to make transistor T under the circuit normal operation ₄Be in cut-off state, this moment, overload detection circuit did not have signal output yet, and control circuit and executive circuit are failure to actuate, foreign minister's power supply normal power supply.In case during any phase phase failure of three phase mains (as passing through L ₁The one phase phase failure of coil), then at coil L ₁Interior non-inductive electric current, transistor T at this moment ₁End, its collector voltage raises, and makes isolating diode D ₃Conducting, the voltage of common wire a is through resistance R after the conducting ₂Diode D ₃To common wire b, current-limiting resistance R ₁₀Trigger controllable silicon SR ₁The control utmost point, make controllable silicon SR ₁Conducting, in the moment of conducting, bridge rectifier positive pole, controllable silicon SR ₂Descend between voltage Shun of anode, thus controllable silicon SR ₂End, this moment is with controllable silicon SR is arranged ₁Conducting, but because current-limiting resistance R ₁₁Effect, its electric current is very little, make bridge rectifier two output end voltages raise and electric current is minimum, bridge rectifier has lost big current output channels, electric current in the actuating coil of A.C. contactor J can not be kept its adhesive, makes A.C. contactor J discharge, and its operating contact disconnects, cut off being connected of foreign minister's power supply and motor, stopped phenomenon because of the circuit inter-burnout-ing motor.If during electromotor overload, then at coil L ₁, L ₂And L ₃In induced current increase, thereby induced voltage is raise, the voltage of this rising is through isolating diode D ₂, D ₅And D ₈To common wire a, make the voltage of common wire a raise, the voltage of rising is through divider resistance R ₇And R ₈After the dividing potential drop, make transistor T ₄Conducting, transistor T ₄After the conducting, electric current is through current-limiting resistance R ₉And R ₁₀To controllable silicon SR ₁The control utmost point, controllable silicon SR ₁Also conducting, its operation principle as mentioned above, thereby also stopped to burn motor because of cross cutting.Reached the purpose of this utility model.

Claims (4)

1, a kind of motor protecting device; this device has a rectangular enclosure made from insulating material (1); shell (1) internal fixation has wiring board (2); it is characterized in that: have A, B, three holes of C on the base Z of described shell (1) and loam cake G and the wiring board (2) accordingly, be installed in the hollow coil L on the wiring board (2) ₁, L ₂And L ₃The hole overlap with A, B, C three holes; Electronics unit, the device of forming testing circuit, control circuit and executive circuit are fixed on wiring board (2) and go up and make its electrical connection; One end is electrically connected on the external connection Y that bridge rectifier F point and E are ordered respectively, and its other end stretches out the outside of rectangular enclosure (1).

2, by the described motor protecting device of claim 1, it is characterized in that: described testing circuit is by coil L ₁, rectifier diode D ₁, filter capacitor C ₁, current-limiting resistance R ₁And R ₂, isolating diode D ₂And D ₃, transistor T ₁Be electrically connected; By coil L ₂, rectifier diode D ₄, filter capacitor C ₂, current-limiting resistance R ₃And R ₄, isolating diode D ₅And D ₆, transistor T ₂Be electrically connected; By coil L ₃, rectifier diode D ₇, filter capacitor C ₃, current-limiting resistance R ₅And R ₆, isolating diode D ₈And D ₉, transistor T ₃Be electrically connected the open-phase detection circuit of forming; With by coil L ₁, rectifier diode D ₁, filter capacitor C ₁And isolating diode D ₂Be electrically connected; By coil L ₂, rectifier diode D ₄, filter capacitor C ₂, isolating diode D ₅Be electrically connected; By coil L ₃, rectifier diode D ₇, filter capacitor C ₂, isolating diode D ₈Be electrically connected the overload detection circuit of forming.

3, by the described motor protecting device of claim 1, it is characterized in that: described control circuit is by the divider resistance R that is electrically connected ₇And R ₈, filter capacitor C ₄, transistor T ₄, current-limiting resistance R ₉And R ₁₀The control circuit of forming.

4, by the described motor protecting device of claim 1, it is characterized in that: described executive circuit is by the controllable silicon SR that is electrically connected ₁And SR ₂, current-limiting resistance R ₁₁, isolating diode D ₁₀, the executive circuit formed of bridge rectifier.

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