CN105552842A - Motor control and protection switch with overload thermal memory protection function - Google Patents
Motor control and protection switch with overload thermal memory protection function Download PDFInfo
- Publication number
- CN105552842A CN105552842A CN201610073943.6A CN201610073943A CN105552842A CN 105552842 A CN105552842 A CN 105552842A CN 201610073943 A CN201610073943 A CN 201610073943A CN 105552842 A CN105552842 A CN 105552842A
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- Prior art keywords
- current transformer
- module
- resistance
- motor
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Classifications
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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
- H02H7/0833—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 for electric motors with control arrangements
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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
- H02H7/0852—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 directly responsive to abnormal temperature by using a temperature sensor
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- Protection Of Generators And Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a motor control and protection switch with an overload thermal memory protection function. The motor control and protection switch comprises a motor, a three-phase switch, an overload thermal memory module, a first current transformer, a second current transformer and a third current transformer, wherein input ends of the first current transformer, the second current transformer and the third current transformer are connected with three phase lines of a three-phase power supply respectively; output ends of the first current transformer, the second current transformer and the third current transformer all are connected with three-phase terminals of the motor through the switch respectively; control ends of the first current transformer, the second current transformer and the third current transformer are connected with corresponding input ends of the overload thermal memory module; and the output end of the overload thermal memory module is connected with the three-phase switch by virtue of a wire. By the motor control and protection switch with the overload thermal memory protection function, the burnout condition that the motor is insulated and damaged due to a temperature rise can be avoided; the service lifetime of the motor is prolonged; and the motor control and protection switch can be used for preventing the motor from being damaged due to an over-high temperature.
Description
Technical field
The present invention relates to a kind of electric switch.Specifically, be used to prevent too high by motor temperature and cause motor damages with Motor Control and the protection switch of crossing heat-carrying memory protect function.
Background technology
All know at electric field, current motor mostly adopts single-chip microcomputer by three-phase current overload, three-phase current unbalance, overvoltage and the defencive function such as under-voltage, finally realize the through and off of switch.When motor running electric current exceedes set point, switch just can play dropout effect.If electric current is too high but when not reaching set point, switch can not be threaded off in motor operation course, motor can not power-off.Because in motor operation course, electric current is too high, the temperature accumulation in motor can be made, the temperature in motor is raised.After the temperature in motor is elevated to maximum permissible temperature, motor insulation damages can be caused and burnt.As can be seen here; although adopt single-chip microcomputer to realize the through and off of switch by three-phase current overload, three-phase current unbalance, overvoltage and the defencive function such as under-voltage; but cannot avoid raising by temperature the motor insulation damages that causes and being occurred by the situation of burning, thus shorten the useful life of motor.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of Motor Control and the protection switch with heat-carrying memory protect function.Adopt this Motor Control and protection switch, can avoid raising by temperature the motor insulation damages that causes and being occurred by the situation of burning, extend the useful life of motor.
The problems referred to above that the present invention will solve are realized by following technical scheme:
Motor Control and the protection switch with heat-carrying memory protect function of the present invention, comprise motor and threephase switch, be characterized in also comprising heat-carrying memory module, first current transformer, second current transformer and the 3rd current transformer, first current transformer, second current transformer is connected with three phase lines of three phase mains respectively with the input of the 3rd current transformer, first current transformer, second current transformer is all connected with the three-phase terminal of motor by switch respectively with the output of the 3rd current transformer, first current transformer, second current transformer is connected with the respective input crossing heat-carrying memory module respectively with the control end of the 3rd current transformer, the output crossing heat-carrying memory module is connected with threephase switch by wire.
Described heat-carrying memory module of crossing comprises single-chip microcomputer, first module module, second unit module and the 3rd unit module, first module module, second unit module are connected with the control end of the 3rd current transformer with the first current transformer, the second current transformer respectively with the input of the 3rd unit module, and the output of first module module, second unit module and the 3rd unit module connects with the respective input of described single-chip microcomputer respectively.
Described first module module, second unit module and the 3rd unit module are all containing operational amplifier and diode, the input anode of operational amplifier is connected to the ground by the 3rd resistance, the first resistance, the second resistance and the first electric capacity is had between the input cathode of operational amplifier and ground, one end of first resistance and the first electric capacity link together as corresponding units module input and be connected to the ground, the first resistance is connected with the input cathode of operational amplifier by the second resistance after being connected with the other end of the first electric capacity again.The negative pole of diode is connected with the output of operational amplifier, and the positive pole of diode is connected to the ground by the 5th resistance and the second electric capacity, and the tie point of the 5th resistance and the second electric capacity and the respective input of described single-chip microcomputer link together.The positive pole of diode and be connected to the 4th resistance between the tie point of the 5th resistance and the input cathode of operational amplifier.
As can be seen from the above scheme, owing to the present invention includes heat-carrying memory module, first current transformer, second current transformer and the 3rd current transformer, first current transformer, second current transformer is connected with three phase lines of three phase mains respectively with the input of the 3rd current transformer, first current transformer, second current transformer is all connected with the three-phase terminal of motor by switch respectively with the output of the 3rd current transformer, first current transformer, second current transformer is connected with the respective input crossing heat-carrying memory module respectively with the control end of the 3rd current transformer, the output crossing heat-carrying memory module is connected with threephase switch by wire.In motor operation course, along with accumulation, the rising of temperature, by crossing heat-carrying memory module by calculating the height judging temperature, make the switch of motor when not reaching overcurrent but temperature is higher, also can thread off, thus avoid and raise by temperature the motor insulation damages that causes and occurred by the situation of burning, substantially prolongs the useful life of motor.
Accompanying drawing explanation
Fig. 1 is Motor Control and the protection switch schematic diagram with heat-carrying memory protect function of the present invention;
Fig. 2 is the mistake heat-carrying memory module electricity principle schematic in Fig. 1.
Embodiment
As shown in Figure 1, of the present invention there is heat-carrying memory protect function Motor Control and protection switch comprise motor 3, threephase switch 2, cross heat-carrying memory module 4, first current transformer 1-1, second current transformer 1-2 and the 3rd current transformer 1-3, first current transformer 1-1, second current transformer 1-2 is connected with three phase lines of three phase mains respectively with the input of the 3rd current transformer 1-3, first current transformer 1-1, second current transformer 1-2 is all connected with the three-phase terminal of motor by switch respectively with the output of the 3rd current transformer 1-3, first current transformer 1-1, second current transformer 1-2 is connected with the respective input crossing heat-carrying memory module 4 respectively with the control end of the 3rd current transformer 1-3, the output crossing heat-carrying memory module 4 is connected with threephase switch 2 by wire.
As shown in Figure 2, described heat-carrying memory module 4 of crossing comprises single-chip microprocessor MCU, first module module, second unit module and the 3rd unit module, first module module, second unit module are connected with the control end of the 3rd current transformer 1-3 with the first current transformer 1-1, the second current transformer 1-1 respectively with the input of the 3rd unit module, and the output of first module module, second unit module and the 3rd unit module connects with the respective input of described single-chip microprocessor MCU respectively.Described first module module, second unit module and the 3rd unit module are all containing operational amplifier U1 and diode D1, the input anode of operational amplifier U1 is connected to the ground by the 3rd resistance R3, the first resistance R1, the second resistance R2 and the first electric capacity C1 is had between the input cathode of operational amplifier U1 and ground, one end of first resistance R1 and the first electric capacity C1 link together as corresponding units module input and be connected to the ground, the first resistance R1 is connected with the input cathode of operational amplifier U1 by the second resistance R2 after being connected with the other end of the first electric capacity C1 again; The negative pole of diode D1 is connected with the output of operational amplifier U1, and the positive pole of diode D1 is connected to the ground by the 5th resistance R5 and the second electric capacity C2, and the tie point of the 5th resistance R5 and the second electric capacity C2 and the respective input of described single-chip microprocessor MCU link together; The positive pole of diode D1 and be connected to the 4th resistance R4 between the tie point of the 5th resistance R5 and the input cathode of operational amplifier U1.
During work, give heat-carrying memory module 4 by the first current transformer 1-1, the second current transformer 1-2 and the 3rd current transformer 1-3 by the electric current in three phase lines, cross heat-carrying memory module 4 judges temperature height by the change of calculating current and time.If the temperature crossing heat-carrying memory module 4 judgement is too high, then exports trip signal to switch, make motor 3 power-off.
Claims (3)
1. there is Motor Control and the protection switch of heat-carrying memory protect function, comprise motor (3) and threephase switch (2), characterized by further comprising heat-carrying memory module (4), first current transformer (1-1), second current transformer (1-2) and the 3rd current transformer (1-3), first current transformer (1-1), second current transformer (1-2) is connected with three phase lines of three phase mains respectively with the input of the 3rd current transformer (1-3), first current transformer (1-1), second current transformer (1-2) is all connected with the three-phase terminal of motor (3) by threephase switch (2) respectively with the output of the 3rd current transformer (1-3), first current transformer (1-1), second current transformer (1-2) is connected with the respective input crossing heat-carrying memory module (4) respectively with the control end of the 3rd current transformer (1-3), the output crossing heat-carrying memory module (4) is connected with threephase switch (2) by wire.
2. Motor Control and the protection switch with heat-carrying memory protect function according to claim 1, it is characterized in that described heat-carrying memory module (4) of crossing comprises single-chip microcomputer (MCU), first module module (4-1), second unit module (4-2) and the 3rd unit module (4-3), first module module (4-1), the input of second unit module (4-2) and the 3rd unit module (4-3) respectively with the first current transformer (1-1), second current transformer (1-2) is connected with the control end of the 3rd current transformer (1-3), first module module (4-1), the output of second unit module (4-2) and the 3rd unit module (4-3) connects with the respective input of described single-chip microcomputer (MCU) respectively.
3. Motor Control and the protection switch with heat-carrying memory protect function according to claim 2, it is characterized in that described first module module (4-1), second unit module (4-2) and the 3rd unit module (4-3) are all containing operational amplifier U1 and diode D1, the input anode of operational amplifier U1 is connected to the ground by the 3rd resistance R3, the first resistance R1 is had between the input cathode of operational amplifier U1 and ground, second resistance R2 and the first electric capacity C1, one end of first resistance R1 and the first electric capacity C1 link together as corresponding units module input and be connected to the ground, first resistance R1 is connected with the input cathode of operational amplifier U1 by the second resistance R2 after being connected with the other end of the first electric capacity C1 again, the negative pole of diode D1 is connected with the output of operational amplifier U1, and the positive pole of diode D1 is connected to the ground by the 5th resistance R5 and the second electric capacity C2, and the tie point of the 5th resistance R5 and the second electric capacity C2 and the respective input of described single-chip microprocessor MCU link together, the positive pole of diode D1 and be connected to the 4th resistance R4 between the tie point of the 5th resistance R5 and the input cathode of operational amplifier U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610073943.6A CN105552842A (en) | 2016-02-03 | 2016-02-03 | Motor control and protection switch with overload thermal memory protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610073943.6A CN105552842A (en) | 2016-02-03 | 2016-02-03 | Motor control and protection switch with overload thermal memory protection function |
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| Publication Number | Publication Date |
|---|---|
| CN105552842A true CN105552842A (en) | 2016-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610073943.6A Pending CN105552842A (en) | 2016-02-03 | 2016-02-03 | Motor control and protection switch with overload thermal memory protection function |
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| CN (1) | CN105552842A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2452193Y (en) * | 2000-10-08 | 2001-10-03 | 王建志 | Micro-computer thermal accumulating motor comprehensive protector |
| CN202042883U (en) * | 2011-01-10 | 2011-11-16 | 北京中纺锐力机电有限公司 | Overcurrent and overload protecting circuit |
| CN102611068A (en) * | 2012-03-16 | 2012-07-25 | 介国安 | Universal protector analog integrated circuit |
| CN104137370A (en) * | 2011-09-06 | 2014-11-05 | 富兰克林控制系统有限公司 | Motor protection and control apparatus, system, and/or method |
| CN104836205A (en) * | 2015-05-29 | 2015-08-12 | 许继集团有限公司 | Motor overload protection method and motor control system using method |
| CN205544218U (en) * | 2016-02-03 | 2016-08-31 | 无锡多普力科技有限公司 | Motor control and protection switch with cross heat -carrying memory protect function |
-
2016
- 2016-02-03 CN CN201610073943.6A patent/CN105552842A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2452193Y (en) * | 2000-10-08 | 2001-10-03 | 王建志 | Micro-computer thermal accumulating motor comprehensive protector |
| CN202042883U (en) * | 2011-01-10 | 2011-11-16 | 北京中纺锐力机电有限公司 | Overcurrent and overload protecting circuit |
| CN104137370A (en) * | 2011-09-06 | 2014-11-05 | 富兰克林控制系统有限公司 | Motor protection and control apparatus, system, and/or method |
| CN102611068A (en) * | 2012-03-16 | 2012-07-25 | 介国安 | Universal protector analog integrated circuit |
| CN104836205A (en) * | 2015-05-29 | 2015-08-12 | 许继集团有限公司 | Motor overload protection method and motor control system using method |
| CN205544218U (en) * | 2016-02-03 | 2016-08-31 | 无锡多普力科技有限公司 | Motor control and protection switch with cross heat -carrying memory protect function |
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Application publication date: 20160504 |
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