CN111193243A - Method for protecting motor based on current detection - Google Patents
Method for protecting motor based on current detection Download PDFInfo
- Publication number
- CN111193243A CN111193243A CN201811356257.5A CN201811356257A CN111193243A CN 111193243 A CN111193243 A CN 111193243A CN 201811356257 A CN201811356257 A CN 201811356257A CN 111193243 A CN111193243 A CN 111193243A
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- China
- Prior art keywords
- interface
- transformer
- current
- motor
- lead
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
Abstract
The invention relates to a method for protecting a motor based on current detection, which comprises the motor, a PLC (programmable logic controller), a current detection circuit, a transformer T1 and a transformer element L1, wherein the motor is provided with three joints which are respectively connected with a control switch Q1 through a first lead, a second lead and a third lead, and the control switch is connected to a three-phase power supply; one end of the transformer element L1 is connected with the current interface, and the other end is grounded. The invention has reasonable design, adopts the collocation and use of the PLC and the current module, is convenient for expanding the program, is easy to realize batch protection of a plurality of motors and saves the cost.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a method for protecting a motor based on current detection.
Background
The starting current for starting the motor is the impact current of the electrical equipment (inductive load) when the electrical equipment is just started, is the current variation from the moment of electrifying the motor or the inductive load to the short time of stable operation, and is generally 4-7 times of the rated current. The rush current is the maximum instantaneous current passed before the input current reaches a steady state when the input voltage is switched on or off at regular time intervals.
Disclosure of Invention
In view of the above, a method for protecting a motor based on current detection with a novel structure is provided.
A method for protecting a motor based on current detection comprises the motor, a PLC (programmable logic controller), a current detection circuit, a transformer T1 and a mutual inductor element L1, wherein the motor is provided with three joints which are respectively connected with a control switch Q1 through a first lead, a second lead and a third lead, and the control switch is connected to a three-phase power supply; the first wire, the second wire and the third wire are also provided with a first switch K1 between the motor and the control switch Q1; the PLC controller is provided with an N interface, an L interface, a 24V interface, a 24G interface, an NC interface, an S/S interface, an XO interface, an X1 interface, a D + interface, a D-interface, a CO interface and a YO interface, and the current detection circuit comprises four GND interfaces, a VCC interface, an A interface, a B interface, a plurality of current interfaces and a plurality of voltage interfaces; the first lead and the second lead are respectively connected to the input end of a transformer T1, the output end of a transformer T1 is respectively connected with an N interface and an L interface, the first lead, the second lead and the transformer T1 are directly provided with a heat circuit breaker F1, and leads are arranged between the heat circuit breaker F1 and the transformer T1 and are respectively connected with a CO interface and a YO interface; the D + interface and the D-interface are respectively connected with the interface A and the interface B through conducting wires, the 24V interface is respectively connected with the S/S interface and the VCC interface, the NC interface, the XO interface and the X1 interface are respectively connected with the same GND interface, a normally open switch S1E is further arranged between the XO interface and the GND interface, and a normally closed switch S2E is further arranged between the X1 interface and the GND interface; the second wire is provided with a transformer element L1 between the control switch Q1 and the first switch K1, one end of the transformer element L1 is connected with the current interface, and the other end of the transformer element L1 is grounded.
Preferably, the plurality of current interfaces include an I0+ interface, an I1+ interface, an I2+ interface, an I3+ interface, an I4+ interface, an I5+ interface, an I6+ interface, and an I7+ interface, and the current interface connected with the transformer element L1 is an I0+ interface.
Preferably, the voltage interfaces include a U8+ interface, a U9+ interface, a U10+ interface, and a U11+ interface.
Preferably, the motor is a three-phase asynchronous motor.
Compared with the prior art, the invention has the beneficial effects that: the electric protection usually adopts a thermal element as protection, the traditional thermal element is easy to age, the service life of the element is limited, the digital calculation method is adopted in the scheme, the device aging caused by the thermal protection process does not exist, the service life is more than 5 times of that of the original device, and the energy conservation is realized; the PLC and the current module are matched for use, so that the program is convenient to expand, the batch protection of a plurality of motors is easy to realize, and the cost is saved; the three-phase power circuit is simplified, and the integration level and the reliability of the circuit are further improved; the protection curve can be customized according to the characteristics of the motor and the process characteristics of the actual production process, so that the motor is protected, the machine halt with the least program is avoided, and the productivity is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a method for protecting a motor based on current detection according to an embodiment of the present invention.
Fig. 2 is a standard thermal overload protection curve for an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
Referring to fig. 1, a method for protecting a motor based on current detection is shown, which includes a motor, a PLC controller, a current detection circuit, a transformer T1 and a transformer element L1, wherein the motor has three connectors, the three connectors are respectively connected to a control switch Q1 through a first wire, a second wire and a third wire, and the control switch is connected to a three-phase power supply; the first wire, the second wire and the third wire are also provided with a first switch K1 between the motor and the control switch Q1; the PLC controller is provided with an N interface, an L interface, a 24V interface, a 24G interface, an NC interface, an S/S interface, an XO interface, an X1 interface, a D + interface, a D-interface, a CO interface and a YO interface, and the current detection circuit comprises four GND interfaces, a VCC interface, an A interface, a B interface, a plurality of current interfaces and a plurality of voltage interfaces; the first lead and the second lead are respectively connected to the input end of a transformer T1, the output end of a transformer T1 is respectively connected with an N interface and an L interface, the first lead, the second lead and the transformer T1 are directly provided with a heat circuit breaker F1, and leads are arranged between the heat circuit breaker F1 and the transformer T1 and are respectively connected with a CO interface and a YO interface; the D + interface and the D-interface are respectively connected with the interface A and the interface B through conducting wires, the 24V interface is respectively connected with the S/S interface and the VCC interface, the NC interface, the XO interface and the X1 interface are respectively connected with the same GND interface, a normally open switch S1E is further arranged between the XO interface and the GND interface, and a normally closed switch S2E is further arranged between the X1 interface and the GND interface; the second wire is provided with a transformer element L1 between the control switch Q1 and the first switch K1, one end of the transformer element L1 is connected with the current interface, and the other end of the transformer element L1 is grounded.
Preferably, the plurality of current interfaces include an I0+ interface, an I1+ interface, an I2+ interface, an I3+ interface, an I4+ interface, an I5+ interface, an I6+ interface, and an I7+ interface, and the current interface connected with the transformer element L1 is an I0+ interface.
Preferably, the voltage interfaces include a U8+ interface, a U9+ interface, a U10+ interface, and a U11+ interface.
Preferably, the motor is a three-phase asynchronous motor.
The method adopts the digital calculation method, the device aging caused by the thermal protection process does not exist, the service life is more than 5 times of that of the original device, and the energy is saved; the PLC and the current module are matched for use, so that the program is convenient to expand, the batch protection of a plurality of motors is easy to realize, and the cost is saved; the three-phase power circuit is simplified, and the integration level and the reliability of the circuit are further improved; the protection curve can be customized according to the characteristics of the motor and the process characteristics of the actual production process, so that the motor is protected, the machine halt with the least program is avoided, and the productivity is improved.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (4)
1. A method for protecting a motor based on current detection is characterized in that: the three-phase current transformer comprises a motor, a PLC (programmable logic controller), a current detection circuit, a transformer T1 and a transformer element L1, wherein the motor is provided with three joints, the three joints are respectively connected with a control switch Q1 through a first lead, a second lead and a third lead, and the control switch is connected to a three-phase power supply; the first wire, the second wire and the third wire are also provided with a first switch K1 between the motor and the control switch Q1; the PLC controller is provided with an N interface, an L interface, a 24V interface, a 24G interface, an NC interface, an S/S interface, an XO interface, an X1 interface, a D + interface, a D-interface, a CO interface and a YO interface, and the current detection circuit comprises four GND interfaces, a VCC interface, an A interface, a B interface, a plurality of current interfaces and a plurality of voltage interfaces; the first lead and the second lead are respectively connected to the input end of a transformer T1, the output end of a transformer T1 is respectively connected with an N interface and an L interface, the first lead, the second lead and the transformer T1 are directly provided with a heat circuit breaker F1, and leads are arranged between the heat circuit breaker F1 and the transformer T1 and are respectively connected with a CO interface and a YO interface; the D + interface and the D-interface are respectively connected with the interface A and the interface B through conducting wires, the 24V interface is respectively connected with the S/S interface and the VCC interface, the NC interface, the XO interface and the X1 interface are respectively connected with the same GND interface, a normally open switch S1E is further arranged between the XO interface and the GND interface, and a normally closed switch S2E is further arranged between the X1 interface and the GND interface; the second wire is provided with a transformer element L1 between the control switch Q1 and the first switch K1, one end of the transformer element L1 is connected with the current interface, and the other end of the transformer element L1 is grounded.
2. The method for protecting a motor based on current sensing of claim 1, wherein: the current interfaces comprise an I0+ interface, an I1+ interface, an I2+ interface, an I3+ interface, an I4+ interface, an I5+ interface, an I6+ interface and an I7+ interface, and the current interface connected with the mutual inductor element L1 is an I0+ interface.
3. The method for protecting a motor based on current sensing of claim 1, wherein: the voltage interfaces comprise a U8+ interface, a U9+ interface, a U10+ interface and a U11+ interface.
4. The method for protecting a motor based on current sensing of claim 1, wherein: the motor is a three-phase asynchronous motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811356257.5A CN111193243A (en) | 2018-11-15 | 2018-11-15 | Method for protecting motor based on current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811356257.5A CN111193243A (en) | 2018-11-15 | 2018-11-15 | Method for protecting motor based on current detection |
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| Publication Number | Publication Date |
|---|---|
| CN111193243A true CN111193243A (en) | 2020-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811356257.5A Pending CN111193243A (en) | 2018-11-15 | 2018-11-15 | Method for protecting motor based on current detection |
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| CN (1) | CN111193243A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039053Y (en) * | 2007-04-17 | 2008-03-19 | 太原惠特科技有限公司 | Soft starter for dual-speed motor start |
| US20140021736A1 (en) * | 2012-07-19 | 2014-01-23 | Rory H. Chenowth | Motor overload protection for cargo canopy systems |
| CN104485640A (en) * | 2014-12-19 | 2015-04-01 | 芜湖新兴铸管有限责任公司 | Protection method of motor overload and open-phase protection circuit for cast pipe production line |
-
2018
- 2018-11-15 CN CN201811356257.5A patent/CN111193243A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039053Y (en) * | 2007-04-17 | 2008-03-19 | 太原惠特科技有限公司 | Soft starter for dual-speed motor start |
| US20140021736A1 (en) * | 2012-07-19 | 2014-01-23 | Rory H. Chenowth | Motor overload protection for cargo canopy systems |
| CN104485640A (en) * | 2014-12-19 | 2015-04-01 | 芜湖新兴铸管有限责任公司 | Protection method of motor overload and open-phase protection circuit for cast pipe production line |
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Application publication date: 20200522 |