CN219811961U - Motor open-phase protection circuit - Google Patents
Motor open-phase protection circuit Download PDFInfo
- Publication number
- CN219811961U CN219811961U CN202321322411.3U CN202321322411U CN219811961U CN 219811961 U CN219811961 U CN 219811961U CN 202321322411 U CN202321322411 U CN 202321322411U CN 219811961 U CN219811961 U CN 219811961U
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- phase
- intermediate relay
- indicator lamp
- normally open
- open contact
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- 230000001012 protector Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
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Abstract
The utility model discloses a motor open-phase protection circuit which comprises a main circuit and a control circuit, wherein a coil of a first intermediate relay KA1 is connected between an A phase of the main circuit and a zero line N of the control circuit, a coil of a second intermediate relay KA2 is connected between a B phase of the main circuit and the zero line N of the control circuit, and a coil of a third intermediate relay KA3 is connected between a C phase of the main circuit and the zero line N of the control circuit. The advantages are that: when the phase A in the main loop is powered off, the phase A indicator lamp is not on; when the A phase is normal and the B phase is powered off, the B phase indicator lamp is not on, and when the A phase and the B phase are normal and the C phase is powered off, the C phase indicator lamp is not on; that is, as long as one phase is powered off, the indicator light is not on; the motor can automatically and continuously run only when three phases are normal, if the motor is in a phase failure, the motor can not run, and the specific phase power failure can be accurately displayed through the indicator lamp; the utility model has simple circuit and low cost.
Description
Technical field:
the utility model relates to the technical field of motor equipment, in particular to a motor open-phase protection circuit.
The background technology is as follows:
the motor protector can provide omnibearing protection for the motor, and the motor protector on the market has various types, including overload, overcurrent and stall, overheat, phase failure, phase sequence, undervoltage, overvoltage, electric leakage and grounding, starting overtime protection and the like; however, each type of wire is unlikely to play a role, the early economic input cost is very high, the service life of the same batch is very long, the cost of the same batch for replacement and upgrading products is higher, the wiring is complex, the number of wire ends is large, and the loose or wrong wire end can affect the use function or can not be normally used; in addition, single protection, for example, the thermal overload relay is insensitive to action, short-circuit protection cannot be realized when the power consumption current is too large, and most importantly, overload response has certain hysteresis when phase failure occurs, and the phenomenon that a motor burns out is caused because the overload response cannot be found in time exists.
The utility model comprises the following steps:
the utility model aims to provide a motor open-phase protection circuit capable of timely finding out motor open-phase.
The utility model is implemented by the following technical scheme: the motor open-phase protection circuit comprises a main loop and a control loop, wherein the main loop is connected with a first air switch QF1 and a normally open contact of a contactor KM in series; the intelligent power supply further comprises a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, an A-phase indicator lamp, a B-phase indicator lamp and a C-phase indicator lamp; the control loop comprises a second air switch QF2, a normally closed button SB1, a normally open button SB2 and a coil of the contactor KM which are sequentially connected in series; the normally open contact of the first intermediate relay KA1, the normally open contact of the second intermediate relay KA2, the normally open contact of the third intermediate relay KA3 and the other normally open contact of the contactor KM are connected in series in sequence and then connected in parallel with the normally open button SB 2; one end of the A-phase indicator lamp, one end of the B-phase indicator lamp and one end of the C-phase indicator lamp are connected to a zero line N of the control loop, the other end of the A-phase indicator lamp is connected between a normally open contact of the first intermediate relay KA1 and a normally open contact of the second intermediate relay KA2, the other end of the B-phase indicator lamp is connected between a normally open contact of the second intermediate relay KA2 and a normally open contact of the third intermediate relay KA3, and the other end of the C-phase indicator lamp is connected between a normally open contact of the third intermediate relay KA3 and another normally open contact of the contactor KM; the coil of the first intermediate relay KA1 is connected between the phase A of the main circuit and the zero line N of the control circuit, the coil of the second intermediate relay KA2 is connected between the phase B of the main circuit and the zero line N of the control circuit, and the coil of the third intermediate relay KA3 is connected between the phase C of the main circuit and the zero line N of the control circuit.
Further, the main loop is also connected with a coil of the thermal relay FR in series, and the zero line N of the control loop is connected with a normally closed switch of the thermal relay FR in series.
The utility model has the advantages that:
when the phase A in the main loop is powered off, the coil of the first intermediate relay KA1 is powered off, the normally open contact of the first intermediate relay KA1 is disconnected, and the phase A indicator lamp, the phase B indicator lamp and the phase C indicator lamp are not on; when the phase A is normal and the phase B is powered off, the coil of the second intermediate relay KA2 is powered off, the normally open contact of the second intermediate relay KA2 is disconnected, the phase A indicator lamp is on, and the phase B indicator lamp and the phase C indicator lamp are not on; when the phase A and the phase B are normal and the phase C is powered off, the coil of the third intermediate relay KA3 is powered off, the normally open contact of the third intermediate relay KA3 is disconnected, the phase A indicator lamp and the phase B indicator lamp are on, and the phase C indicator lamp is not on; that is, as long as one phase is powered off, the indicator light is not on; the motor can automatically and continuously run only when three phases are normal, if the motor is in a phase failure, the motor can not run, and the specific phase power failure can be accurately displayed through the indicator lamp; the utility model has simple circuit and low cost.
Description of the drawings:
fig. 1 is a schematic structural view of the present utility model.
The components in the drawings are marked as follows: the control circuit comprises a main circuit 1, a motor 1.1, a first air switch QF1, a contactor KM, a thermal relay FR, a control circuit 2, an A-phase indicator lamp 2.1, a B-phase indicator lamp 2.2, a C-phase indicator lamp 2.3, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a second air switch QF2, a normally closed button SB1 and a normally open button SB2.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the embodiment provides a motor open-phase protection circuit, which comprises a main circuit 1 and a control circuit 2, wherein the main circuit 1 is a three-phase power line, the main circuit 1 is connected with a normally open contact of a first air switch QF1 and a contactor KM in series, and the main circuit 1 is also connected with a coil of a thermal relay FR in series; the three-phase relay further comprises a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, an A-phase indicator lamp 2.1, a B-phase indicator lamp 2.2 and a C-phase indicator lamp 2.3.
The control loop 2 comprises a second air switch QF2, a normally closed button SB1, a normally open button SB2 and a coil of a contactor KM which are sequentially connected in series; the normally open contact of the first intermediate relay KA1, the normally open contact of the second intermediate relay KA2, the normally open contact of the third intermediate relay KA3 and the other normally open contact of the contactor KM are connected in series in sequence and then connected in parallel with the normally open button SB2.
The live wire L of the control loop 2 is taken from other power lines outside the main loop 1, one end of the A-phase indicator lamp 2.1, one end of the B-phase indicator lamp 2.2 and one end of the C-phase indicator lamp 2.3 are connected to a zero line N of the control loop 2, the other end of the A-phase indicator lamp 2.1 is connected between a normally open contact of the first intermediate relay KA1 and a normally open contact of the second intermediate relay KA2, the other end of the B-phase indicator lamp 2.2 is connected between a normally open contact of the second intermediate relay KA2 and a normally open contact of the third intermediate relay KA3, and the other end of the C-phase indicator lamp 2.3 is connected between a normally open contact of the third intermediate relay KA3 and another normally open contact of the contactor KM.
The coil of the first intermediate relay KA1 is connected between the phase A of the main circuit 1 and the zero line N of the control circuit 2, the coil of the second intermediate relay KA2 is connected between the phase B of the main circuit 1 and the zero line N of the control circuit 2, the coil of the third intermediate relay KA3 is connected between the phase C of the main circuit 1 and the zero line N of the control circuit 2, and the coil of the first intermediate relay KA1, the coil of the second intermediate relay KA2 and the coil of the third intermediate relay KA3 are connected in a star mode; the zero line N of the control loop 2 is connected with a normally closed switch of the thermal relay FR in series, thereby playing a role of protection.
The method comprises the steps of closing a first air switch QF1 connected in series on a main loop 1 and a second air switch QF2 connected in series on a control loop 2, pressing a normally open button SB2, powering up a coil of a contactor KM, closing a normally open contact of the contactor KM on the control loop 2, self-locking, closing a normally open contact of the contactor KM on the main loop 1, and starting a motor 1.1.
When the phase A in the main loop is powered off, the coil of the first intermediate relay KA1 is powered off, the normally open contact of the first intermediate relay KA1 is disconnected, and the phase A indicator lamp, the phase B indicator lamp and the phase C indicator lamp are not on; when the phase A is normal and the phase B is powered off, the coil of the second intermediate relay KA2 is powered off, the normally open contact of the second intermediate relay KA2 is disconnected, the phase A indicator lamp is on, and the phase B indicator lamp and the phase C indicator lamp are not on; when the phase A and the phase B are normal and the phase C is powered off, the coil of the third intermediate relay KA3 is powered off, the normally open contact of the third intermediate relay KA3 is disconnected, the phase A indicator lamp and the phase B indicator lamp are on, and the phase C indicator lamp is not on; that is, as long as one phase is powered off, the indicator light is not on; the motor can automatically and continuously run only when three phases are normal, if the motor is in a phase failure, the motor can not run, and the specific phase power failure can be accurately displayed through the indicator lamp; the utility model has simple circuit and low cost.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (2)
1. The motor open-phase protection circuit comprises a main loop and a control loop, wherein the main loop is connected with a first air switch QF1 and a normally open contact of a contactor KM in series; the intelligent power supply is characterized by further comprising a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, an A-phase indicator lamp, a B-phase indicator lamp and a C-phase indicator lamp;
the control loop comprises a second air switch QF2, a normally closed button SB1, a normally open button SB2 and a coil of the contactor KM which are sequentially connected in series; the normally open contact of the first intermediate relay KA1, the normally open contact of the second intermediate relay KA2, the normally open contact of the third intermediate relay KA3 and the other normally open contact of the contactor KM are connected in series in sequence and then connected in parallel with the normally open button SB 2;
one end of the A-phase indicator lamp, one end of the B-phase indicator lamp and one end of the C-phase indicator lamp are connected to a zero line N of the control loop, the other end of the A-phase indicator lamp is connected between a normally open contact of the first intermediate relay KA1 and a normally open contact of the second intermediate relay KA2, the other end of the B-phase indicator lamp is connected between a normally open contact of the second intermediate relay KA2 and a normally open contact of the third intermediate relay KA3, and the other end of the C-phase indicator lamp is connected between a normally open contact of the third intermediate relay KA3 and another normally open contact of the contactor KM;
the coil of the first intermediate relay KA1 is connected between the phase A of the main circuit and the zero line N of the control circuit, the coil of the second intermediate relay KA2 is connected between the phase B of the main circuit and the zero line N of the control circuit, and the coil of the third intermediate relay KA3 is connected between the phase C of the main circuit and the zero line N of the control circuit.
2. The motor open-phase protection circuit according to claim 1, wherein the main circuit is further connected with a coil of a thermal relay FR in series, and a zero line N of the control circuit is connected with a normally closed switch of the thermal relay FR in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321322411.3U CN219811961U (en) | 2023-05-25 | 2023-05-25 | Motor open-phase protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321322411.3U CN219811961U (en) | 2023-05-25 | 2023-05-25 | Motor open-phase protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219811961U true CN219811961U (en) | 2023-10-10 |
Family
ID=88214936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321322411.3U Active CN219811961U (en) | 2023-05-25 | 2023-05-25 | Motor open-phase protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219811961U (en) |
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2023
- 2023-05-25 CN CN202321322411.3U patent/CN219811961U/en active Active
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