CN213753975U - Open-phase protection control circuit for three-phase motor - Google Patents
Open-phase protection control circuit for three-phase motor Download PDFInfo
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- CN213753975U CN213753975U CN202022757336.6U CN202022757336U CN213753975U CN 213753975 U CN213753975 U CN 213753975U CN 202022757336 U CN202022757336 U CN 202022757336U CN 213753975 U CN213753975 U CN 213753975U
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Abstract
The utility model discloses a three-phase motor open-phase protection control circuit, including relay and ac contactor, the relay includes relay coil and first relay normally open contact, ac contactor includes ac contactor coil and ac contactor main contact, relay coil one end and three-phase ac power's first looks main loop are connected, the other end is connected with three-phase ac power's second phase main loop, first relay normally open contact one end is connected with three-phase ac power's first looks main loop, the other end is connected with ac contactor coil one end, the ac contactor coil other end is connected with three-phase ac power's third phase main loop, ac contactor main contact installs on three-phase main loop between three-phase ac power and three-phase motor, and be located between three-phase main loop and relay and ac contactor's junction and three-phase motor. The utility model discloses a control circuit can realize three-phase motor's open-phase protection, simple structure, and the wiring is simple, safe and reliable.
Description
Technical Field
The utility model relates to a motor control technical field especially relates to a three-phase motor open-phase protection control circuit.
Background
In the operation process of the three-phase motor, if a certain phase power supply line is disconnected, the three-phase motor is caused to be out of phase, the current is abnormally increased, and if the power fails to be cut off in time, the motor is burnt and damaged. And the repair time after the motor is burnt out is longer, so that the stable operation of production is influenced, and economic loss is caused to users.
At present, realize the open-phase protection to three-phase motor through the installation open-phase protector, however the open-phase protector structure is complicated, and is expensive, has also additionally increased new fault point when newly increasing the open-phase protector to current technical maintenance strength is weak relatively, leads to the use of open-phase protector to have certain limitation.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that exists among the above-mentioned prior art, the utility model provides a three-phase motor lacks looks protection control circuit.
The utility model discloses a three-phase motor open-phase protection control circuit, which is used for realizing the open-phase protection of a three-phase motor connected with a three-phase alternating current power supply and comprises a relay and an alternating current contactor;
the relay includes relay coil and first relay normally open contact, ac contactor includes ac contactor coil and ac contactor main contact, relay coil one end with three-phase alternating current power's first looks main loop is connected, the other end with three-phase alternating current power's second looks main loop is connected, first relay normally open contact one end with three-phase alternating current power's first looks main loop is connected, the other end with ac contactor coil one end is connected, the ac contactor coil other end with three-phase alternating current power's third phase main loop is connected, ac contactor main contact is installed three-phase alternating current power with on the three-phase main loop between the three-phase motor, and be located three-phase main loop with the relay reaches ac contactor's junction point with between the three-phase motor.
In some optional embodiments, the open-phase protection control circuit of the three-phase motor further comprises a control switch;
the control switch can be closed and disconnected, the control switch is installed the first looks major loop of three-phase alternating current power supply with between the relay coil, control switch one end with the first looks major loop of three-phase alternating current power supply is connected, the other end with relay coil one end with first relay normally open contact one end is connected.
In some optional embodiments, the open-phase protection control circuit of the three-phase motor further comprises a stop button and a start button, and the relay further comprises a second normally open contact of the relay;
stop button is normally closed inching button, start button is normally open inching button, stop button installs three-phase alternating current power supply's first looks major loop with between the relay coil, start button installs stop button with between the relay coil, stop button one end with three-phase alternating current power supply's first looks major loop is connected, the other end with start button one end with first relay normally open contact one end is connected, the start button other end with relay coil one end is connected, second relay normally open contact with start button parallel connection.
In some optional embodiments, the three-phase ac power supply is a 380V ac power supply.
The technical scheme of the invention has the following main advantages:
the utility model discloses a three-phase motor lacks looks protection control circuit controls three-phase motor's power supply major loop through the break-make of relay contact and ac contactor contact, can realize three-phase motor's the lack looks protection, simple structure, the wiring is simple, and use cost is low, safe and reliable.
Drawings
The accompanying drawings, which are set forth herein, serve to provide a further understanding of the embodiments of the present invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are illustrative of the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is an electrical schematic diagram of a three-phase motor open-phase protection control circuit according to an embodiment of the present invention;
fig. 2 is an electrical schematic diagram of a three-phase motor open-phase protection control circuit according to an embodiment of the present invention;
fig. 3 is an electrical schematic diagram of a three-phase motor open-phase protection control circuit according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a phase-loss protection control circuit for a three-phase motor, the control circuit is used for implementing phase-loss protection of the three-phase motor connected to a three-phase ac power supply, and includes a relay and an ac contactor; the relay includes relay coil and first relay normally open contact, ac contactor includes ac contactor coil and ac contactor main contact, relay coil one end is connected with three-phase alternating current power supply's first looks major loop, the other end is connected with three-phase alternating current power supply's second looks major loop, first relay normally open contact one end is connected with three-phase alternating current power supply's first looks major loop, the other end is connected with ac contactor coil one end, the ac contactor coil other end is connected with three-phase alternating current power supply's third phase major loop, ac contactor main contact is installed on three-phase major loop between three-phase alternating current power supply and three phase machine, and be located between three-phase major loop and relay and ac contactor's junction and three phase machine.
The first phase is not particularly the L1 phase of the three-phase ac power source, and may be the L2 phase or the L3 phase; the second phase is not particularly limited to the L2 phase of the three-phase ac power supply, and may be an L1 phase or an L3 phase; the third phase is not particularly limited to the L3 phase of the three-phase ac power supply, and may be an L2 phase or an L1 phase; the L1 phase, the L2 phase, and the L3 phase represent the three-phase sequence of the three-phase ac power supply, and the first phase, the second phase, and the third phase are three different phases of the three-phase ac power supply. In an embodiment of the present invention, the electrical structure and the operation principle of the open-phase protection control circuit for a three-phase motor are specifically described by taking, as an example, the L1 phase in which the first phase is a three-phase ac power supply, the L2 phase in which the second phase is a three-phase ac power supply, and the L3 phase in which the third phase is a three-phase ac power supply.
Specifically, when the open-phase protection control circuit of the three-phase motor is used, when an open-phase fault occurs to an L1 phase power supply of a three-phase alternating-current power supply, a relay coil KA is de-energized, a first relay normally open contact KA1 is reset and disconnected, an alternating-current contactor coil KM is de-energized, and an alternating-current contactor main contact KM1 is reset and disconnected, so that a main loop of the three-phase motor and the three-phase alternating-current power supply is cut off, the three-phase motor stops running, and the open-phase protection of the three-phase motor is realized; when the L2 phase power supply of the three-phase alternating current power supply has a phase failure, the relay coil KA loses power, the first relay normally open contact KA1 is reset and disconnected, the alternating current contactor coil KM is powered off, and the alternating current contactor main contact KM1 is reset and disconnected, so that the main loop of the three-phase motor and the three-phase alternating current power supply is cut off, the three-phase motor stops running, and the phase failure protection of the three-phase motor is realized; when the L3 phase power supply of the three-phase alternating current power supply has a phase-failure fault, the coil KM of the alternating current contactor is directly powered off, and the main contact KM1 of the alternating current contactor is reset and disconnected, so that the main loop of the three-phase motor and the three-phase alternating current power supply is cut off, the three-phase motor stops running, and the phase-failure protection of the three-phase motor is realized.
The utility model relates to a three-phase machine open-phase protection control circuit that embodiment provided is when using, no matter which looks power of three-phase AC inlet wire power appears lacking the looks, and the ac contactor coil all can cut off the power supply, makes ac contactor main contact disconnection that resets to cut off three-phase machine's power supply main loop, make three-phase machine stop operation, realize three-phase machine's open-phase protection.
Furthermore, in order to control the start and stop of the control circuit and the three-phase motor conveniently, the control circuit can be further provided with a switch module, and the control circuit and the three-phase motor can be controlled by a worker by using the switch module.
Specifically, how to arrange the switch modules to realize the control circuit and the start and stop control of the three-phase motor is exemplified below.
Referring to fig. 2, as an example, the open-phase protection control circuit for a three-phase motor may further include a control switch, the control switch being capable of being turned on and off, the control switch being installed between a first-phase main circuit of the three-phase ac power supply and the relay coil, one end of the control switch being connected to the first-phase main circuit of the three-phase ac power supply, and the other end thereof being connected to one end of the relay coil and one end of the normally open contact of the first relay.
Specifically, when the three-phase motor open-phase protection control circuit of the first example is used, and when the control circuit and the three-phase motor need to be operated, the control switch SA is adjusted to the closed position, at this time, the relay coil KA is powered on, the first relay normally-open contact KA1 is closed, the ac contactor coil KM is powered on, and the ac contactor main contact KM1 is closed, so that the three-phase motor and a main circuit of a three-phase ac power supply are connected, and the three-phase motor is started to operate; when the control circuit needs to be disconnected and the three-phase motor needs to stop running, the control switch SA is adjusted to a disconnection position, at the moment, the relay coil KA loses power, the first relay normally-open contact KA1 is reset and disconnected, the alternating current contactor coil KM is powered off, and the alternating current contactor main contact KM1 is reset and disconnected, so that a main loop of the three-phase motor and a main loop of a three-phase alternating current power supply are cut off, and the three-phase motor stops running; meanwhile, in the operation process of the three-phase motor, if any phase power supply of the three-phase alternating-current power supply has a phase failure, the coil KM of the alternating-current contactor is powered off, and the main contact KM1 of the alternating-current contactor is reset and disconnected, so that a power supply main loop of the three-phase motor is cut off, the three-phase motor stops operating, and the phase failure protection of the three-phase motor is realized.
Referring to fig. 3, as another example, the open-phase protection control circuit of the three-phase motor may further include a stop button and a start button, and the relay further includes a second relay normally open contact; stop button is normally closed inching button, start button is normally open inching button, stop button installs between three-phase AC power's first looks major loop and relay coil, start button installs between stop button and relay coil, stop button one end is connected with the first looks major loop of three-phase AC power, the other end is connected with start button one end and first relay normally open contact one end, the start button other end is connected with relay coil one end, second relay normally open contact and start button parallel connection.
Specifically, when the three-phase motor open-phase protection control circuit of the second example is used, and when the control circuit and the three-phase motor need to be operated, the start button SB2 is pressed, at this time, the relay coil KA is powered on, the first relay normally-open contact KA1 is closed, the second relay normally-open contact KA2 is closed and self-retained, so that the alternating current contactor coil KM is powered on, and the alternating current contactor main contact KM1 is closed, so that the three-phase motor and a main loop of a three-phase alternating current power supply are connected, and the three-phase motor is started to operate; when the control circuit needs to be disconnected and the three-phase motor needs to stop running, the stop button SB1 is pressed, the relay coil KA loses power at the moment, the first relay normally-open contact KA1 and the second relay normally-open contact KA2 are reset and disconnected, the AC contactor coil KM is powered off, and the AC contactor main contact KM1 is reset and disconnected, so that a main loop of the three-phase motor and a main loop of a three-phase AC power supply are cut off, and the three-phase motor stops running; meanwhile, in the operation process of the three-phase motor, if any phase power supply of the three-phase alternating-current power supply has a phase failure, the coil KM of the alternating-current contactor is powered off, and the main contact KM1 of the alternating-current contactor is reset and disconnected, so that a power supply main loop of the three-phase motor is cut off, the three-phase motor stops operating, and the phase failure protection of the three-phase motor is realized.
In an embodiment of the present invention, the three-phase ac power supply is a 380V ac power supply.
The utility model relates to an embodiment, the inlet wire power supply side in three-phase motor control circuit and motor major loop has set gradually isolator and air circuit breaker.
It is visible, the utility model relates to an embodiment provides a three-phase motor lacks looks protection control circuit controls three-phase motor's power supply main loop through the break-make of relay contact and ac contactor contact, can realize three-phase motor's the lack looks protection, simple structure, and the wiring is simple, and use cost is low, safe and reliable.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. The open-phase protection control circuit of the three-phase motor is characterized in that the control circuit is used for realizing open-phase protection of the three-phase motor connected to a three-phase alternating current power supply and comprises a relay and an alternating current contactor;
the relay includes relay coil and first relay normally open contact, ac contactor includes ac contactor coil and ac contactor main contact, relay coil one end with three-phase alternating current power's first looks main loop is connected, the other end with three-phase alternating current power's second looks main loop is connected, first relay normally open contact one end with three-phase alternating current power's first looks main loop is connected, the other end with ac contactor coil one end is connected, the ac contactor coil other end with three-phase alternating current power's third phase main loop is connected, ac contactor main contact is installed three-phase alternating current power with on the three-phase main loop between the three-phase motor, and be located three-phase main loop with the relay reaches ac contactor's junction point with between the three-phase motor.
2. The open-phase protection control circuit of the three-phase motor according to claim 1, further comprising a control switch;
the control switch can be closed and disconnected, the control switch is installed the first looks major loop of three-phase alternating current power supply with between the relay coil, control switch one end with the first looks major loop of three-phase alternating current power supply is connected, the other end with relay coil one end with first relay normally open contact one end is connected.
3. The open-phase protection control circuit of the three-phase motor according to claim 1, further comprising a stop button and a start button, wherein the relay further comprises a second relay normally open contact;
stop button is normally closed inching button, start button is normally open inching button, stop button installs three-phase alternating current power supply's first looks major loop with between the relay coil, start button installs stop button with between the relay coil, stop button one end with three-phase alternating current power supply's first looks major loop is connected, the other end with start button one end with first relay normally open contact one end is connected, the start button other end with relay coil one end is connected, second relay normally open contact with start button parallel connection.
4. A three-phase motor open-phase protection control circuit according to any one of claims 1 to 3, characterized in that the three-phase ac power supply is a 380V ac power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757336.6U CN213753975U (en) | 2020-11-25 | 2020-11-25 | Open-phase protection control circuit for three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757336.6U CN213753975U (en) | 2020-11-25 | 2020-11-25 | Open-phase protection control circuit for three-phase motor |
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| Publication Number | Publication Date |
|---|---|
| CN213753975U true CN213753975U (en) | 2021-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022757336.6U Active CN213753975U (en) | 2020-11-25 | 2020-11-25 | Open-phase protection control circuit for three-phase motor |
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| CN (1) | CN213753975U (en) |
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- 2020-11-25 CN CN202022757336.6U patent/CN213753975U/en active Active
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