CN220692818U - Three-phase motor protector - Google Patents
Three-phase motor protector Download PDFInfo
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- CN220692818U CN220692818U CN202322267063.0U CN202322267063U CN220692818U CN 220692818 U CN220692818 U CN 220692818U CN 202322267063 U CN202322267063 U CN 202322267063U CN 220692818 U CN220692818 U CN 220692818U
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- phase motor
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- phase
- switch
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- 230000001012 protector Effects 0.000 title claims description 22
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Abstract
The utility model relates to a three-phase motor protection device, including detection module, control module and switch module, detection module is used for detecting three-phase motor's temperature and exports real-time temperature value, control module receives real-time temperature value to compare real-time temperature value with predetermineeing the temperature value, under the condition that real-time temperature value is greater than predetermineeing the temperature value, control module output stop signal, switch module is equipped with three, three switch module is used for connecting respectively between U, V, W input and the U, V, W output of three-phase motor, switch module responds stop signal in order to break off the connection between three-phase motor and the three-phase power supply. Under the condition that the real-time temperature value is larger than the preset temperature value, all the switch modules respond to the stop signal to disconnect the connection between the three-phase motor and the three-phase power supply, so that the three-phase circuit is disconnected, the phase-missing work of the three-phase motor is avoided, and the overheat protection of the three-phase motor is realized.
Description
Technical Field
The present application relates to the field of three-phase motors, and in particular, to a three-phase motor protection device.
Background
The three-phase motor adopts a three-phase alternating current power supply and is mainly used for realizing high-power output.
In order to ensure the safety of the three-phase motor, a thermal protector is often arranged. Thermal protector: consists of one or more heat sensitive elements built in the motor and an external control device. When excessive heat is generated in the motor circuit, the thermal protection is started, and the motor circuit can be cut off instantaneously. So as to stop the motor before the temperature rises to burn out the motor and prevent the motor from continuously rising.
Because the three-phase motor adopts a three-phase alternating current power supply, if the thermal protector is triggered to disconnect a certain phase circuit, the three-phase motor can still work in a phase-missing mode.
Disclosure of Invention
In order to achieve overheat protection of a three-phase motor, the application provides a three-phase motor protection device.
The application provides a three-phase motor protection device adopts following technical scheme:
a three-phase motor protection device comprises a detection module, a control module and a switch module,
the detection module is used for detecting the temperature of the three-phase motor and outputting a real-time temperature value,
the control module receives the real-time temperature value and compares the real-time temperature value with a preset temperature value,
under the condition that the real-time temperature value is larger than the preset temperature value, the control module outputs a stop signal,
the three switch modules are respectively connected between the U, V, W input end of the three-phase motor and the U, V, W output end of the three-phase power supply, and respond to a stop signal to disconnect the three-phase motor from the three-phase power supply.
By adopting the technical scheme, under the condition that the real-time temperature value is larger than the preset temperature value, all the switch modules respond to the stop signal to disconnect the connection between the three-phase motor and the three-phase power supply, so as to disconnect the three-phase circuit, avoid the phase-missing work of the three-phase motor and realize overheat protection of the three-phase motor.
Preferably, the detection module is used for detecting the temperature of windings in the three-phase motor and outputting a real-time temperature value.
Through adopting above-mentioned technical scheme, in the three-phase motor operation process, heat accumulates in the three-phase motor inside earlier for the inside temperature of three-phase motor is higher than motor casing surface temperature, through detecting the inside temperature of three-phase motor, and in time provides the overheat protection to three-phase motor.
Preferably, the detection module and the control module employ thermal protectors,
and under the condition that the real-time temperature value is larger than the preset temperature value, the thermal protector outputs a stop signal.
By adopting the technical scheme, the detection module and the control module are integrated in the thermal protector, so that the quantity of spare parts is reduced, and the production is facilitated.
Preferably, the three switch modules adopt contactors, coils of the contactors are connected with the control module, and contact switches of the contactors are used for being connected with an input end of the three-phase motor and an output end of the three-phase power supply.
Through adopting above-mentioned technical scheme, three switch module integrates in the contactor, only needs output signal to coil, can realize controlling three-phase circuit's switch-on, does benefit to reducing spare and accessory part quantity, the production of being convenient for.
Preferably, the motor further comprises a grounding module for being connected between any one of the input terminals U, V, W of the three-phase motor and a grounding terminal,
the grounding module responds to a stop signal to enable the input terminal to be conducted with the grounding terminal.
By adopting the technical scheme, the ground protection of the three-phase motor is realized.
Preferably, the device also comprises an operation module,
the operation module is used for outputting a starting signal under the condition that a preset mechanism is met,
the switch module is responsive to a start signal to close a connection between the three-phase motor and the three-phase power source.
By adopting the technical scheme, the three-phase motor is restarted under the condition of meeting a preset mechanism.
Preferably, the preset mechanism includes at least one of the following mechanisms:
the real-time temperature value is smaller than the set temperature value;
in response to a closing operation by a person.
By adopting the technical scheme, if the preset mechanism comprises that the real-time temperature value is smaller than the set temperature value, the three-phase motor is automatically restarted after the three-phase motor is cooled.
If the preset mechanism includes a closing operation in response to a person, the three-phase motor is manually restarted after the person removes the obstacle.
Preferably, the preset mechanism includes a switch and a relay for starting the operation module in response to a closing operation of a person,
one end of the starting switch is connected with a power supply, the other end of the starting switch is used for outputting a starting signal,
the normally open switch of the relay is connected in parallel with the starting switch, and the coil of the relay is connected in series with the starting switch.
By adopting the technical scheme, a person operates the starting switch, the three-phase motor is connected and conducted with the three-phase power supply, and the three-phase motor works; and the coil of the relay is electrified to attract the normally open switch, so that the circuit is kept on.
Preferably, a stop switch is further included, the stop switch being connected between the control module and the switch module.
By adopting the technical scheme, a person operates the stop switch to disconnect the connection between the control module and the switch module, so that the connection between the three-phase motor and the three-phase power supply is disconnected, and the three-phase motor stops working.
In summary, the present application includes at least one of the following beneficial technical effects:
1. under the condition that the real-time temperature value is larger than the preset temperature value, all the switch modules respond to the stop signal to disconnect the three-phase motor from the three-phase power supply, so that a three-phase circuit is disconnected, the phase-missing work of the three-phase motor is avoided, and the overheat protection of the three-phase motor is realized;
2. in the operation process of the three-phase motor, heat is accumulated in the three-phase motor, so that the temperature in the three-phase motor is higher than the temperature of the outer surface of the motor shell, and overheat protection of the three-phase motor is provided in time by detecting the temperature in the three-phase motor.
Drawings
Fig. 1 is a block diagram of a three-phase motor protection device.
Fig. 2 is a schematic diagram of the circuit connection of a three-phase motor protection device.
Fig. 3 is a schematic diagram of circuit connection of a three-phase motor protection device in other embodiments.
Reference numerals illustrate: 1. a detection module; 2. a control module; 3. a switch module; 0. a thermal protector.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-3.
Referring to fig. 1, an embodiment of the application discloses a three-phase motor protection device, which comprises a detection module 1, a control module 2 and a switch module 3.
The detection module 1 is used for detecting the temperature of windings in the three-phase motor and outputting a real-time temperature value.
The control module 2 receives the real-time temperature value and compares the real-time temperature value with a preset temperature value. And under the condition that the real-time temperature value is larger than the preset temperature value, the control module 2 outputs a stop signal.
The three switch modules 3 are arranged, and the three switch modules 3 are respectively connected between the U, V, W input end of the three-phase motor and the U, V, W output end of the three-phase power supply. The switching module 3 is responsive to the stop signal to disconnect the three-phase motor from the three-phase power supply.
In the embodiment of the application: the detection module 1 and the control module 2 are integrated in the thermal protector 0; under the condition that the real-time temperature value is larger than the preset temperature value, the thermal protector 0 outputs a stop signal; the three switch modules 3 adopt contactors, the coils of which are connected with the thermal protector 0, and the contact switches of the contactors are used for being connected with the input end of the three-phase motor and the output end of the three-phase power supply, and the contact switches of the contactors are normally open switches.
Specific: referring to fig. 1 and 2, a coil KM1 of a contactor having three normally open contact switches KM1-1, KM1-2, KM1-3 is connected in series with a thermal protector 0. The contact switch KM1-1 is connected between the U-phase output end of the three-phase power supply and the U-phase input end of the three-phase motor; the contact switch KM1-2 is connected between the V-phase output end of the three-phase power supply and the V-phase input end of the three-phase motor; the contact switches KM1-3 are connected between the W-phase output end of the three-phase power supply and the W-phase input end of the three-phase motor.
The heat sensitive element of the thermal protector 0 is installed in the motor to detect the temperature of the windings in the three-phase motor.
The real-time temperature value is smaller than the preset temperature value, the thermal protector 0 enables the circuit of the coil KM1 of the contactor to be conducted, the coil KM1 is electrified, then the contact switches KM1-1, KM1-2 and KM1-3 are all closed, and the three-phase motor can work normally.
The real-time temperature value is larger than the preset temperature value, the thermal protector 0 cuts off a circuit of a coil KM1 of the contactor, and when the coil KM1 is powered off, the contact switches KM1-1, KM1-2 and KM1-3 are all disconnected.
Referring to fig. 3, in other embodiments, the three-phase motor protection device further includes a grounding module and an operating module.
The grounding module is used for being connected between any one of the input ends of the U, V, W of the three-phase motor and the grounding end, and the grounding module responds to a stop signal to enable the input end to be conducted with the grounding end.
Specifically, the grounding module is integrated with the contactor. That is, the contactor also comprises normally closed contact switches KM1-4, and the contact switches KM1-4 are connected between the U-phase input end and the grounding end of the three-phase motor.
And the operation module is used for outputting a starting signal under the condition that a preset mechanism is met. The switching module 3 is responsive to the start signal to close the connection between the three-phase motor and the three-phase power supply.
The preset mechanism includes at least one of the following mechanisms:
the real-time temperature value is smaller than the set temperature value;
in response to a closing operation by a person.
In one embodiment, the preset mechanism includes that the real-time temperature value is smaller than the set temperature value, and the thermal protector 0 has an automatic reset function.
In another embodiment, the preset mechanism includes responding to a closing operation by a person, and the thermal protector 0 has a received reset button.
In this embodiment, the preset mechanism includes that the real-time temperature value is smaller than the set temperature value and responds to the closing operation of the person.
Specifically, the thermal protector 0 has an automatic reset function, and the operation module includes a stop switch, a start switch, and a relay.
The stop switch S1 is normally closed, and the start switch S2 is normally open. One end of the stop switch S1 is connected with VCC, the stop switch S1, the start switch S2 and a coil KM2 of the relay are sequentially connected in series, and the coil KM2 of the relay is connected with the thermal protector 0. The normally open switch KM2-1 of the relay is connected in parallel with the start switch S2.
The implementation principle of the three-phase motor protection device in the embodiment of the application is as follows: under the condition that the real-time temperature value is larger than the preset temperature value, all the switch modules 3 respond to the stop signal to disconnect the connection between the three-phase motor and the three-phase power supply, so that the three-phase circuit is disconnected, the phase-missing work of the three-phase motor is avoided, and the overheat protection of the three-phase motor is realized.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (9)
1. A three-phase motor protection device, characterized in that: comprises a detection module (1), a control module (2) and a switch module (3),
the detection module (1) is used for detecting the temperature of the three-phase motor and outputting a real-time temperature value,
the control module (2) receives the real-time temperature value and compares the real-time temperature value with a preset temperature value,
under the condition that the real-time temperature value is larger than the preset temperature value, the control module (2) outputs a stop signal,
the three switch modules (3) are arranged, the three switch modules (3) are respectively connected between the U, V, W input end of the three-phase motor and the U, V, W output end of the three-phase power supply, and the switch modules (3) respond to stop signals to disconnect the three-phase motor from the three-phase power supply.
2. The three-phase motor protection device according to claim 1, wherein: the detection module (1) is used for detecting the temperature of a winding in the three-phase motor and outputting a real-time temperature value.
3. The three-phase motor protection device according to claim 1, wherein: the detection module (1) and the control module (2) adopt a thermal protector (0),
and under the condition that the real-time temperature value is larger than the preset temperature value, the thermal protector (0) outputs a stop signal.
4. The three-phase motor protection device according to claim 1, wherein: the three switch modules (3) adopt contactors, coils of the contactors are connected with the control module (2), and contact switches of the contactors are used for being connected with input ends of the three-phase motor and output ends of the three-phase power supply.
5. The three-phase motor protection device according to claim 1, wherein: and a grounding module for connecting between any one of the input terminals of the three-phase motor U, V, W and a grounding terminal,
the grounding module responds to a stop signal to enable the input terminal to be conducted with the grounding terminal.
6. The three-phase motor protection device according to claim 1, wherein: the device also comprises an operation module, wherein the operation module is used for controlling the operation of the device,
the operation module is used for outputting a starting signal under the condition that a preset mechanism is met,
the switching module (3) is responsive to a start signal to close a connection between the three-phase motor and the three-phase power supply.
7. The three-phase motor protection device according to claim 6, wherein the preset mechanism includes at least one of the following mechanisms:
the real-time temperature value is smaller than the set temperature value;
in response to a closing operation by a person.
8. The three-phase motor protection device according to claim 7, wherein: in the case where the preset mechanism includes a closing operation in response to a person, the operation module includes a start switch and a relay,
one end of the starting switch is connected with a power supply, the other end of the starting switch is used for outputting a starting signal,
the normally open switch of the relay is connected in parallel with the starting switch, and the coil of the relay is connected in series with the starting switch.
9. The three-phase motor protection device according to claim 1, wherein: the control device further comprises a stop switch which is connected between the control module (2) and the switch module (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322267063.0U CN220692818U (en) | 2023-08-22 | 2023-08-22 | Three-phase motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322267063.0U CN220692818U (en) | 2023-08-22 | 2023-08-22 | Three-phase motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220692818U true CN220692818U (en) | 2024-03-29 |
Family
ID=90374590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322267063.0U Active CN220692818U (en) | 2023-08-22 | 2023-08-22 | Three-phase motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220692818U (en) |
-
2023
- 2023-08-22 CN CN202322267063.0U patent/CN220692818U/en active Active
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