CN217362563U - Open-phase protection control circuit for three-phase star motor - Google Patents
Open-phase protection control circuit for three-phase star motor Download PDFInfo
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- CN217362563U CN217362563U CN202123430786.5U CN202123430786U CN217362563U CN 217362563 U CN217362563 U CN 217362563U CN 202123430786 U CN202123430786 U CN 202123430786U CN 217362563 U CN217362563 U CN 217362563U
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Abstract
The utility model discloses a three-phase star motor open-phase protection control circuit, wherein, the normally closed contact of the stop button is connected in series with the normally open contact of the start button and the coil of the main contactor in sequence, and then is connected between two phases of the three-phase alternating current power supply; one end of the capacitor is connected with a three-phase outgoing line of a three-phase alternating current power supply respectively, the other end of the capacitor is connected with one alternating current input end of the rectifier bridge stack after being connected to the same point, the other alternating current input end of the rectifier bridge stack is connected with the N phase of the three-phase alternating current power supply after being connected with a normally closed contact of a starting button in series, the positive electrode and the negative electrode of a direct current output end of the rectifier bridge stack are connected with a polar capacitor, a voltage stabilizing diode and a coil of an intermediate relay respectively in parallel, and the normally closed contact of the intermediate relay is connected with a normally open contact of a main contactor in series and then connected with a normally open contact of the starting button in parallel. The utility model discloses the simple structure of circuit, function safe and reliable, with low costs through establishing people for the neutral point, do not have the consumption of electricity, have realized the effectual protection motor effect of economy.
Description
Technical Field
The utility model belongs to the technical field of motor safety protection, concretely relates to three-phase star type motor open-phase protection control circuit.
Background
In the present three-phase four-wire system motor power supply system, if the motor is in normal operation and the power supply side is in phase failure due to well-known reasons such as mechanical contact, the motor is easily burnt without a protection function if the power supply of the motor control loop is not taken from the phase failure side power supply. The existing protector circuit still has electricity consumption when in action, and when the power supply is in phase failure, the protector can fail due to electrification, so that the motor cannot be protected.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the open-phase protection problem of three-phase star type motor, provide three-phase star type motor open-phase protection control circuit, the utility model discloses the simple structure of circuit, function safe and reliable, with low costs are neutral point through establishing people, do not have the consumption of electricity, have realized the effectual protection motor effect of economy.
The utility model discloses a following technical scheme realizes the purpose:
the open-phase protection control circuit of the three-phase star-shaped motor comprises a start-stop control loop and a default-phase protection loop, wherein in the start-stop control loop, a normally closed contact of a stop button SB1 is sequentially connected in series with a normally open contact of a start button SB2 and a coil of a main contactor KM and then connected between two phases of a three-phase alternating-current power supply L2 and L3, and three phases of L1, L2 and L3 of the three-phase alternating-current power supply are respectively output to the three-phase star-shaped motor through a dynamic-closing normally open main contact KM-0 of the main contactor KM; in the open-phase protection loop, one ends of capacitors C1, C2 and C3 are respectively connected with three-phase outgoing lines L1, L2 and L3 of a three-phase alternating-current power supply, the other ends of the capacitors are connected to the same point and then connected with one alternating-current input end of a rectifier bridge stack UR, the other alternating-current input end of the rectifier bridge stack UR is connected with a normally closed contact of a starting button SB2 in series and then connected with an N phase of the three-phase alternating-current power supply, the positive electrode and the negative electrode of a direct-current output end of the rectifier bridge stack UR are respectively connected with a polar capacitor C0, a voltage stabilizing diode WD and a coil of an intermediate relay KA in parallel, and a normally closed contact KA-2 of the intermediate relay KA is connected with a normally open contact KM-1 of a main contactor KM in series and then connected with a normally open contact of the starting button SB2 in parallel.
Specifically, the rectifier bridge stack UR includes diodes VD1, VD2, VD3 and VD4, wherein the anode of the diode VD1 is connected with the cathode of the diode VD3 and led out as the ac input end of the rectifier bridge stack UR, the anode of the diode VD2 is connected with the cathode of the diode VD4 and led out as the ac input end of the other side of the rectifier bridge stack UR, the cathodes of the diodes VD1 and VD2 are connected and led out as the anodes of the dc output ends, and the anodes of the diodes VD3 and VD4 are connected and led out as the cathodes of the dc output ends.
Preferably, the open-phase protection circuit further includes a freewheeling diode FD connected in parallel with the intermediate relay KA.
Preferably, the system further comprises a thermal relay FR, three phases L1, L2 and L3 of the three-phase alternating-current power supply respectively pass through the thermal relay FR and then are output to the three-phase star-shaped motor, the thermal relay FR is located between a power-on normally-open main contact KM-0 of the main contactor KM and lead-out wire positions of three phases of capacitors C1, C2 and C3 of the three-phase alternating-current power supply L1, L2 and L3, and a normally-closed control contact FR-0 of the thermal relay FR is connected to the start-stop control loop in series.
Furthermore, the three phases of the three-phase alternating current power supply L1, L2 and L3 are connected with a circuit breaker QF, and the circuit breaker QF adopts a three-phase disconnecting link switch or an air switch.
Preferably, the three-phase fuses FU are connected to the three phases of L1, L2, and L3 of the three-phase ac power supply.
Specifically, the rated voltage of the voltage regulator diode WD is 12V, and the intermediate relay KA is a direct current 12V relay.
To sum up, owing to adopted this technical scheme, the beneficial effects of the utility model are as follows:
the protection circuit provided by the utility model has the advantages of simple structure, reliable function and low cost, the artificial star-shaped neutral point is formed by three capacitors, no electricity is consumed, and the power factor of the capacitors can be improved; when the open phase occurs, the motor circuit and the control circuit can be cut off in time, the open phase protection of the motor is realized, the protection action is in time and reliable, the false operation can not occur when the motor is started or stopped, and the motor circuit, the control circuit and the protection circuit are all designed with necessary protection devices in the circuit design, so that the protection circuit is safe and reliable.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a schematic connection diagram of the middle rectifier bridge stack UR of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. While the components of the embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations, all other embodiments obtained by those of ordinary skill in the art without making creative efforts will fall within the scope of the present invention.
As shown in figure 1, the open-phase protection control circuit of the three-phase star-shaped motor comprises a motor circuit, a start-stop control circuit and a phase-failure protection circuit.
In a motor circuit, L1, L2 and L3 three phases of a three-phase alternating current power supply respectively pass through a breaker QF, a fuse FU, a power-on normally-open main contact KM-0 of a main contactor KM and a thermal relay FR, and then are output to a three-phase star-shaped motor M, so that the motor can operate.
The start-stop control loop comprises a main contactor KM coil connected between two phases of a three-phase alternating-current power supply L2 and L3 in series, a stop button SB1 normally closed contact and a start button SB2 normally open contact which are connected to a loop where the main contactor KM coil is located, and meanwhile the main contactor KM further comprises a normally open contact KM-1 connected with the start button SB2 in parallel.
The thermal relay FR connected in the motor circuit functions as follows: three phases L1, L2 and L3 of a three-phase alternating current power supply are respectively output to a three-phase star-shaped motor M after passing through a thermal relay FR, the thermal relay FR is positioned between a dynamic closing normally-open main contact KM-0 of a main contactor KM and three-phase capacitors C1, C2 and C3 leading-out wire positions of the three phases L1, L2 and L3, a normally closed control contact FR-0 of the thermal relay FR is connected in series to a start-stop control loop, when the circuit generates heat to a certain degree, the thermal relay FR can act to cause the main contactor KM coil to lose power, thereby disconnecting all loops and playing a thermal overload protection function.
The circuit breaker QF connected in the motor circuit has the function of controlling the on-off of all circuits, and the circuit breaker QF adopts a three-phase disconnecting link switch or an air switch.
The conventional start-stop control is as follows: after a starting button SB2 is pressed, a coil of a main contactor KM is electrified, a dynamic normally-open main contact KM-0 of the main contactor KM is closed, a three-phase star motor M is electrified to operate, and meanwhile, a normally-open contact KM-1 of the main contactor KM is closed, so that the coil of the main contactor KM is continuously electrified to form self-locking, and the motor can continuously operate; after the stop button SB1 is pressed, the main contactor KM coil loses power, so that the power supply of the motor circuit and the control circuit is disconnected, and the motor stops running.
The open-phase protection loop comprises a rectifier bridge stack UR, capacitors C1, C2 and C3 connected with an alternating current input end on one side of the rectifier bridge stack UR, a polar capacitor C0, a voltage stabilizing diode WD and an intermediate relay KA coil which are respectively connected with a positive electrode and a negative electrode of a direct current output end of the rectifier bridge stack UR in parallel, the other sides of the capacitors C1, C2 and C3 are respectively connected with three-phase outgoing lines of an L1, an L2 and an L3 of a three-phase alternating current power supply, an alternating current input end on the other side of the rectifier bridge stack UR is connected with a normally closed contact of a starting button SB2 in series and then connected with an N phase of the three-phase alternating current power supply, and a normally closed contact KA-2 of the intermediate relay KA is connected with a normally open contact KM-1 of a main contactor KM in series and then connected with a normally open contact of the starting button SB-2 in parallel.
As shown in fig. 2, the rectifier bridge stack UR includes 4 diodes having 4 connection terminals, wherein the anode of the diode VD1 is connected to the cathode of the diode VD2 and led out as the ac input terminal of the rectifier bridge stack UR, the anode of the diode VD2 is connected to the cathode of the diode VD4 and led out as the ac input terminal of the other side of the rectifier bridge stack UR, the diode VD1 is connected to the cathode of the diode VD2 and led out as the anode of the dc output terminal, and the diode VD3 is connected to the anode of the diode VD4 and led out as the cathode of the dc output terminal.
Capacitors C1, C2 and C3 are respectively connected from three-phase outgoing lines L1, L2 and L3 of a three-phase alternating current power supply, and the other ends of the capacitors C1, C2 and C3 are connected to the same point, namely a star-shaped neutral point; when the three-phase alternating current power supply is not in phase failure, the voltage at the point is 0, and when any phase of the three-phase alternating current power supply is in phase failure, the voltage at the point can rise, so that the phase failure protection circuit is connected.
When the three-phase power supply is not in phase failure, the alternating current input side of the rectifier bridge stack UR has no voltage, and the direct current output side has no voltage output, so that the intermediate relay KA has no power and does not act, and the normally closed contact KA-2 of the intermediate relay KA keeps a closed state, so that the control circuit works; when the open-phase occurs, the voltage of the star-shaped neutral point rises, the voltage is alternating current voltage, the rectifier bridge stack UR rectifies the alternating current voltage into pulsating direct current voltage, the pulsating direct current voltage is output through a direct current output end, at the moment, the parallel-connected polar capacitor C0 plays a role in filtering, the pulsating direct current voltage is changed into smooth direct current voltage, the smooth direct current voltage is added to two ends of the intermediate relay KA, the coil of the intermediate relay KA is electrified, the normally closed contact KA-2 of the intermediate relay KA acts and is disconnected, the coil of the main contactor KM is electrified, the motor circuit and the control circuit are disconnected, and open-phase protection is achieved.
In this embodiment, the intermediate relay KA adopts a direct current 12V relay, and is connected in parallel with a zener diode WD with a rated voltage of 12V to prevent the protective function failure caused by the unstable voltage in the protective circuit burning the intermediate relay coil, and the voltage of the parallel circuit can be stabilized through the zener diode WD to protect the intermediate relay KA.
The other side AC input end of rectifier bridge pile UR concatenates start button SB2 normally closed contact and connects to the N looks of three-phase AC power after, the setting here is used for, when pressing start button SB2 and wanting to start the motor, can make the start button SB2 normally closed contact that is connected on rectifier bridge pile UR return circuit break off simultaneously, the purpose is that the auxiliary relay KA coil is electrified when starting the motor, normally closed contact KA-2 breaks off, can't start the motor, after the motor normally starts, when three-phase AC power does not lack the looks, auxiliary relay KA does not have the electrical input, can normally carry out the relevant functional action of open-phase protection afterwards.
The coil of the intermediate relay KA in the open-phase protection circuit is also connected with a freewheeling diode FD in parallel, the freewheeling diode FD and the coil of the intermediate relay KA form a circuit, and high voltage generated by the start or the end of the action process is consumed in the circuit in a freewheeling current mode, so that the intermediate relay KA is further protected from being damaged.
Claims (7)
1. Three-phase star type motor open-phase protection control circuit, its characterized in that: the three-phase alternating-current power supply system comprises a start-stop control loop and a phase-failure protection loop, wherein in the start-stop control loop, a normally closed contact of a stop button SB1 is sequentially connected in series with a normally open contact of a start button SB2 and a coil of a main contactor KM and then connected between two phases of a three-phase alternating-current power supply L2 and L3, and three phases of the three-phase alternating-current power supply L1, L2 and L3 are respectively output to a three-phase star motor through a dynamic-close normally open main contact KM-0 of the main contactor KM; in the open-phase protection loop, one ends of capacitors C1, C2 and C3 are respectively connected with three-phase outgoing lines L1, L2 and L3 of a three-phase alternating-current power supply, the other ends of the capacitors are connected to the same point and then connected with one alternating-current input end of a rectifier bridge stack UR, the other alternating-current input end of the rectifier bridge stack UR is connected with a normally closed contact of a starting button SB2 in series and then connected with an N phase of the three-phase alternating-current power supply, the positive electrode and the negative electrode of a direct-current output end of the rectifier bridge stack UR are respectively connected with a polar capacitor C0, a voltage stabilizing diode WD and a coil of an intermediate relay KA in parallel, and a normally closed contact KA-2 of the intermediate relay KA is connected with a normally open contact KM-1 of a main contactor KM in series and then connected with a normally open contact of the starting button SB2 in parallel.
2. The open-phase protection control circuit of the three-phase star motor according to claim 1, characterized in that: the rectifier bridge stack UR comprises diodes VD1, VD2, VD3 and VD4, wherein the anode of the diode VD1 is connected with the cathode of the diode VD3 and led out to be an alternating current input end of the rectifier bridge stack UR, the anode of the diode VD2 is connected with the cathode of the diode VD4 and led out to be an alternating current input end of the other side of the rectifier bridge stack UR, the cathodes of the diodes VD1 and VD2 are connected and led out to be the anodes of direct current output ends, and the anodes of the diodes VD3 and VD4 are connected and led out to be the cathodes of the direct current output ends.
3. The open-phase protection control circuit of the three-phase star motor according to claim 1, characterized in that: the open-phase protection loop further comprises a fly-wheel diode FD connected with the intermediate relay KA in parallel.
4. The open-phase protection control circuit of the three-phase star motor according to claim 1, characterized in that: the three-phase alternating-current power supply system further comprises a thermal relay FR, three phases L1, L2 and L3 of the three-phase alternating-current power supply respectively pass through the thermal relay FR and then are output to the three-phase star-shaped motor, the thermal relay FR is located between a power-on normally-open main contact KM-0 of the main contactor KM and leading-out wire positions of three-phase capacitors C1, C2 and C3 of the three-phase alternating-current power supply L1, L2 and L3, and a normally-closed control contact FR-0 of the thermal relay FR is connected to the start-stop control loop in series.
5. The open-phase protection control circuit of the three-phase star motor according to claim 1, characterized in that: the three phases of the three-phase alternating current power supply L1, L2 and L3 are connected with a circuit breaker QF, and the circuit breaker QF adopts a three-phase disconnecting link switch or an air switch.
6. The open-phase protection control circuit of the three-phase star motor according to claim 1, characterized in that: the three phases of the three-phase alternating current power supply L1, L2 and L3 are connected with a fuse FU.
7. The open-phase protection control circuit of the three-phase star motor according to claim 1, characterized in that: the rated voltage of the voltage stabilizing diode WD is 12V, and the intermediate relay KA adopts a direct current 12V relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123430786.5U CN217362563U (en) | 2021-12-30 | 2021-12-30 | Open-phase protection control circuit for three-phase star motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123430786.5U CN217362563U (en) | 2021-12-30 | 2021-12-30 | Open-phase protection control circuit for three-phase star motor |
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| Publication Number | Publication Date |
|---|---|
| CN217362563U true CN217362563U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123430786.5U Active CN217362563U (en) | 2021-12-30 | 2021-12-30 | Open-phase protection control circuit for three-phase star motor |
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| Country | Link |
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| CN (1) | CN217362563U (en) |
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2021
- 2021-12-30 CN CN202123430786.5U patent/CN217362563U/en active Active
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