CN102340127A - Digitalized comprehensive motor protector - Google Patents
Digitalized comprehensive motor protector Download PDFInfo
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- CN102340127A CN102340127A CN2011102469119A CN201110246911A CN102340127A CN 102340127 A CN102340127 A CN 102340127A CN 2011102469119 A CN2011102469119 A CN 2011102469119A CN 201110246911 A CN201110246911 A CN 201110246911A CN 102340127 A CN102340127 A CN 102340127A
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Abstract
The invention discloses a digitalized comprehensive motor protector, comprising a motor operating signal detecting circuit, a current transformer, a current converting circuit, a central processing unit, a control output relay and a fault output relay, wherein the central processing unit is respectively connected with the motor operating signal detecting circuit and the current converting circuit and is used for processing signals returned by the motor operating signal detecting circuit and the current converting circuit; and the control output relay and the fault output relay are connected with the central processing unit, and the control output relay is used for responding to control signals sent by the central processing unit. The digitalized comprehensive motor protector is characterized by further comprising an abnormal output relay which is connected with the central processing unit and is used for responding to a superior power circuit disconnection instruction sent by the central processing unit; and contacts controlled by the abnormal output relay are arranged in a superior power circuit. The digitalized comprehensive motor protector is used for preventing dangers on high-altitude weight dropping caused by abnormal conditions, so that not only is the production efficiency of national and industrial and mining enterprises guaranteed, but also the lives and the safety of working staff in workshops are better protected.
Description
Technical field
The present invention relates to a kind of digitized integrated protector for electric motor.
Background technology
Existing motor protector popular feature is that unicity is strong, and degree of integration is not high, especially to the salvo imperfection of crane with motor.After 4.18 serious accidents take place in Qinghe, Liaoning special steel Co., Ltd; The immediate cause of analysis accident is exactly the conversing contactor fault; Cause the motor dead electricity and brake still the energising; Cause that weight is out of control to fall, for this reason, do among [2007] No. 375 literary compositions of spy, the TS-GQ0002-2008 " hoisting machinery safety and technical supervision rules-bridge crane " in state's matter and to stipulate: crane should have forward and reverse contactor failure protection function; Prevent the motor dead electricity and brake is still switched on, cause stall of motor to cause weight to fall.Require according to 7.4.6 bar among new " hoist design specification " GB/T3811-2008 that " the jack machinism motor should be provided with the unusual loss protecting function of stator, and when speed regulating device and forward and reverse contactor fault caused motor out of control, brake is brake application immediately." make a general survey of domestic and international motor protection device and can satisfy the motor protector that this type of method of inspection and GB require fully and also do not have.Therefore a kind of novel integrated protector for electric motor is badly in need of being developed.Thereby the phase failure, undercurrent, overcurrent, overload, abnormal failure to motor are protected, and satisfy Minister of the General Administration for Quality Supervision's check and GB requirement.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop a kind of digitized integrated protector for electric motor.The technological means that the present invention adopts is following:
A kind of digitized integrated protector for electric motor comprises:
The motor operation signal testing circuit that motor operating state is detected;
The current transformer that the motor stator electric current is detected;
Connect current transformer, current transformer is passed back the current converter circuit that signal is handled;
Connect motor operation signal testing circuit and current converter circuit respectively; Information to motor operation signal testing circuit and current converter circuit are passed back is handled; After finding that the phase failure, undercurrent, overcurrent or motor overheating situation appear in the motor input, send the CPU of control warning, motor power disconnection and switching signal;
Connect CPU, the control signal that CPU is sent responds the warning of control warning circuit, and the control output relay that breaks off motor power and brake power supply; When providing motor operation signal, detect the motor stator electric current through current transformer, when stator current greater than the undercurrent set point and there are not other faults; And during the time of arrive setting; CPU can be controlled the output relay action, provides and opens a sluice gate signal, and the control brake device is opened a sluice gate; When providing motor signal out of service, perhaps do not satisfy under the above-mentioned situation of opening a sluice gate condition at other, CPU can be controlled the output relay action, provides switching signal, and the control brake device closes a floodgate;
It is characterized in that also comprising:
Be used for the unusual output relay of control setting in the contact of higher level's motor circuit;
Said CPU detects motor operation signal through the motor operation signal testing circuit, judges the jack machinism running status, and when judging jack machinism and normally move, the contact of control setting in higher level's motor circuit is in closure state; Carry out timing after out of service judging jack machinism; CPU compares through current signal that current converter circuit is passed back and set point and judges; After the time of timing surpassed the time of setting, CPU detects motor stator still had electric current, and this current value is greater than set point; Then control abnormity output relay action is controlled higher level's motor circuit contact then and is broken off.
Also comprise the PTC thermistor that is embedded in the motor winding, said PTC thermistor is connected with CPU, for CPU provides motor real-time temperature signal.
Also comprise the connection CPU, the LCD display unit that the current of electric after the central processing unit for processing, PTC resistance, motor status and system status signal are shown; And CPU carried out the key circuit that the input of some control commands and parameter are imported.
The contact of said control output relay control is separately positioned in the input power supply of warning circuit, motor input power supply and brake.
Also be provided with Profibus Dp from station interface.
Drive controlling output relay action when the unusual output relay of said central processing unit controls moves, the control warning circuit is reported to the police, and breaks off motor power and brake power supply.
Owing to adopted technique scheme; The various motor safety problems that integrated protector for electric motor provided by the invention can the scene of solving might exist; Especially for the on-the-spot safety in production of crane applications huge convenient and help is provided; The danger of falling in the weight high-altitude of having avoided causing because of abnormal conditions takes place, and has not only ensured the productivity effect of country and industrial and mining enterprises, has more protected shop personnel's life security.It is simple in structure, be convenient to produce and with low cost being very suitable for extensively promoted in the crane safety field.
Description of drawings
Fig. 1 is a structural representation of the present invention;
The sketch map that Fig. 2 uses in system for the present invention.
Embodiment
This integrated protector for electric motor is as shown in Figure 1 to be comprised: the power module that electric energy is provided for the whole protecting device; The motor operation signal testing circuit that motor operating state is detected; The current transformer that motor stator electric current (promptly to the motor three-phase power input state) is detected; Connect current transformer, current transformer is passed back the current converter circuit that signal is handled; Connect motor operation signal testing circuit and current converter circuit respectively; Information to motor operation signal testing circuit and current converter circuit are passed back is handled; After finding that the phase failure, undercurrent, overcurrent or motor overheating situation appear in the motor input, send the CPU (device that can adopt MCU or other to have the logical process function is realized) of control warning, motor power disconnection and switching signal; Connect CPU; The control signal that CPU is sent responds the warning of control warning circuit; And control output relay (the label C as shown in Figure 2 that breaks off motor power and brake power supply; Label C ' is the brake contactor, the closure or openness of control output relay C control brake device contactor C ');
Said CPU detects motor operation signal through the motor operation signal testing circuit, judges the jack machinism running status, when judging jack machinism and normally move; Inner testing circuit can detect the motor stator electric current, when stator current greater than the undercurrent set point and there are not other faults, and when arriving certain hour (like 1s time); Then can control the output relay action; Relay contact closure, the action of control brake device provides and opens a sluice gate signal.During above-mentioned relay contact closure condition unmet, relay contact breaks off, and the action of control brake device provides switching signal.When detecting fault, relay contact breaks off and keeps, and needs SR or deenergization to reset.
Fault output relay (label B as shown in Figure 2; The fault output relay can detect following 12 kinds of faults: U phase overcurrent fault, V phase overcurrent fault, W phase overcurrent fault, U phase undercurrent fault, V phase undercurrent fault, W phase undercurrent fault, U phase open-phase fault, V phase open-phase fault, W phase open-phase fault, three-phase imbalance fault, system exception fault, motor overheating fault) under the normal condition; When having detected the power supply input; This relay contact closure; When detecting above arbitrary fault in system's running, then motor protector sends signal, the action of control output relay; Relay contact breaks off and keeps, and provides the effect of fault-signal.And be used for control setting in the unusual output relay of the contact of higher level's motor circuit (label A as shown in Figure 2, unusual output relay A control higher level motor circuit contactor A ' action); Said CPU detects motor operation signal through the motor operation signal testing circuit, judges the jack machinism running status, and when judging jack machinism and normally move, the contact of control setting in higher level's motor circuit is in closure state; Carry out timing after out of service judging jack machinism, CPU compares through current signal that current converter circuit is passed back and set point and judges, after the time of timing surpasses the time of setting; CPU detects motor stator still has electric current (being that the current signal passed back of current converter circuit is non-vanishing); And this current value is greater than set point, and then the control abnormity output relay moves, promptly unusual output relay A control higher level motor circuit contactor A ' action; Then controlling higher level's motor circuit contact breaks off; Higher level's motor circuit is broken off, and motor and brake power supply break off, and brake brake application is immediately protected; When main purpose is to prevent that speed regulating device or forward and reverse contactor fault from causing motor out of control, can play a protective role.For example: when providing the motor halt instruction, forward and reverse contactor should break off immediately, if but this moment forward and reverse contactor stick together, external actuators is not closed a floodgate, and does not have other extraneous protections, can slip the danger of hook, causes great potential safety hazard.And this abnormity protection function can make higher level's power loop break off, and motor and brake power supply break off then, and brake brake application is immediately protected.Thereby avoided potential safety hazard, reached guarantee hoisting machinery purpose of safe operation.
Higher level's power loop is the power supply front end of motor operating circuit, when breaking down, (can be control higher level circuit breaker from the outage of higher level's power loop; Contactor etc.), make motor and brake three-phase main power source lose fully, rather than the previously used most of protector of picture; Simple control brake device contactor; And forward and reverse contactor action, also be equivalent to duplicate protection, guarantee the crane safety operation.
Adding clocking capability on the such scheme basis in addition: after motor operation signal becomes " stopping "; After surpassing the preset time (being anomaly detection time); Any one current value of threephase stator electric current still exceeds set point (can with reference to the motor undercurrent limit), and motor protecter control abnormity output relay is made abnormal conditions protection action.This protection is controlled through the action of the unusual output relay in the integrated protector for electric motor, breaks off higher level's motor circuit control point during fault.Its contact is closed and condition: under the normal condition, keep closure all the time.The disconnection condition: when power supply input, no motor operation signal, detecting motor still has electric current, breaks off and keeps, and needs SR or deenergization to reset." anomaly detection time " set under " threshold values " subitem, and unit is second.
This protector also is provided with Profibus Dp from station interface.Profibus Dp slave station communication function; Important monitor data that Profibus Dp through this protector can obtain this protector from station interface and state information are uploaded to host computer (PLC etc.), and to upload cycle data be 100ms; Profibus Dp communication baud rate: 9.6kbps～12Mbps, self adaptation; Profibus Dp port internal fault and online, off-line state recognition function; Profibus Dp enables, prohibiting function; Profibus Dp tributary address function;
Receive the down-transmitting data function
This protector possesses the Profibus of reception Dp down-transmitting data function, can expand according to practical application, and be reservation function at present.
It is following that motor protector Profibus Dp uploads data:
U phase current (0～65535 ampere)
V phase current (0～65535 ampere)
W phase current (0～65535 ampere)
PTC resistance (0～98) unit: 0.1 kilo-ohm
Motor operation signal (motor stops the operation of or motor)
Control relay state (normally opened contact open circuit or normally opened contact is closed)
Power transfer relay state (normally opened contact open circuit or normally opened contact is closed)
Unusual relay status (normally opened contact open circuit or normally opened contact is closed)
Profibus Dp port working (the online or Dp of Dp off-line)
Protector work at present state (normal or fault)
The parameter setting explanation
DP enables: default 0---forbids this protector Profibus Dp function
1---enables this protector Profibus Dp function
DP address: default 11
Must correctly set when using the Profibus Dp function of this protector
When not using Profibus Dp slave station function, should " Dp enables " parameter be set to 0; Before using Profibus Dp slave station function, should " Dp enables " parameter be set to 1, and correct " Dp address " parameter of setting.
For further guaranteeing safety, drive controlling output relay action when the unusual output relay of central processing unit controls moves, the warning of control warning circuit, and disconnection motor power and brake power supply.
This protector also can be with all kinds of GPF (General Protection False functions; The protective device that possesses following GPF (General Protection False device: also comprise the PTC thermistor that is embedded in the motor winding, said PTC thermistor is connected with CPU through the thermistor testing circuit; Also comprise the connection CPU, the LCD display unit that the current of electric after the central processing unit for processing, PTC resistance, motor status and system status signal are shown; And CPU carried out the key circuit that the input of some control commands and parameter are imported; The contact of said control output relay control is separately positioned in the warning circuit, and in the input power supply of motor, brake.Specifically comprise following GPF (General Protection False:
Motor phase failure protection; U, V, W three phase mains signal are input in the motor protector through current transformer; CPU MCU (single-chip microcomputer) is through comparing, judging; Motor is carried out open-phase protection: promptly when motor stator three-phase phase shortage or three-phase current unbalance, the control relay drive circuit carries out fault alarm, breaks off motor, brake power supply.
The motor undercurrent protection; U, V, W three phase mains signal are input in the motor protector through current transformer; CPU MCU (single-chip microcomputer) compares, judges through current signal and the set point with input, motor carried out undercurrent protection: promptly when jack machinism moves, detect motor stator currents less than set point (motor moves minimum stator current); The control relay drive circuit carries out fault alarm, breaks off motor, brake power supply.
Motor overcurrent protection; U, V, W three phase mains signal are input in the motor protector through current transformer; CPU MCU (single-chip microcomputer) compares, judges through current signal and the set point with input; Motor is carried out overcurrent protection: promptly when motor stator currents surpassed motor rated current set point, the control relay drive circuit carried out fault alarm, broke off motor, brake power supply.Overcurrent protection has inverse time protection and two kinds of defencive functions of moving protection of wink simultaneously.Integral operation is used in the inverse time protection of overcurrent protection, through the current of electric that detects, thereby judges whether motor generates heat, and motor is carried out effectively level and smooth safeguard protection.The wink of overcurrent protection moving protection promptness and fail safe higher, when judgement has overcurrent condition, move immediately.
The electric motor overheating protection; The temperature signal that said CPU MCU (single-chip microcomputer) passes back through monitoring PT C thermistor testing circuit detects motor temperature, the accumulation heating situation of calculating motor; Calculated value and set point are compared, judge; Thereby to the motor protection of generating heat: promptly when detecting the PTC parameter and change, the control relay drive circuit carries out fault alarm, breaks off motor, brake power supply.
Motor running condition monitoring and demonstration can be observed " current of electric " from the protector display panels, " PTC resistance ", " motor status ", " system mode " four groups of information.No matter can real-time monitor motor operation integral status, be normal operating condition or malfunction, can in display floater, observe very intuitively, also can play good directive function when carrying out safety check for the on-the-spot security inspection personnel.
Three-phase imbalance protection, stator three-phase current difference is exceeding preset scope-" maximum phase current is poor ", and exceeds that Preset Time-after " uneven maximum time ", protector is promptly made unbalance protection action time.
This integrated protector for electric motor applied environment is wide in range, and basic application conditions is following:
Motor: S3, the YZ series squirrel-cage motor of S4 duty/YZR series wound-rotor motor;
Operating environment temperature :-20 ℃～+ 60 ℃;
Duty: can satisfy motor S3, the S4 duty;
Relative humidity:＜95%, frozen-free;
Working power: AC220V (15%～+ 10%).
The above; Be merely the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or change according to technical scheme of the present invention and inventive concept thereof in the technical scope that the present invention discloses, all should be encompassed within protection scope of the present invention.
Claims (6)
1. digitized integrated protector for electric motor comprises:
The motor operation signal testing circuit that motor operating state is detected;
The current transformer that the motor stator electric current is detected;
Connect current transformer, current transformer is passed back the current converter circuit that signal is handled;
Connect motor operation signal testing circuit and current converter circuit respectively; Information to motor operation signal testing circuit and current converter circuit are passed back is handled; After finding that the phase failure, undercurrent, overcurrent or motor overheating situation appear in the motor input, send the CPU of control warning, motor power disconnection and switching signal;
Connect CPU, the control signal that CPU is sent responds the warning of control warning circuit, and the control output relay that breaks off motor power and brake power supply; When providing motor operation signal, detect the motor stator electric current through current transformer, when stator current greater than the undercurrent set point and there are not other faults; And during the time of arrive setting; CPU can be controlled the output relay action, provides and opens a sluice gate signal, and the control brake device is opened a sluice gate; When providing motor signal out of service, perhaps do not satisfy under the above-mentioned situation of opening a sluice gate condition at other, CPU can be controlled the output relay action, provides switching signal, and the control brake device closes a floodgate;
It is characterized in that also comprising:
Be used for the unusual output relay of control setting in the contact of higher level's motor circuit;
Said CPU detects motor operation signal through the motor operation signal testing circuit, judges the jack machinism running status, and when judging jack machinism and normally move, the contact of control setting in higher level's motor circuit is in closure state; Carry out timing after out of service judging jack machinism; CPU compares through current signal that current converter circuit is passed back and set point and judges; After the time of timing surpassed the time of setting, CPU detects motor stator still had electric current, and this current value is greater than set point; Then control abnormity output relay action is controlled higher level's motor circuit contact then and is broken off.
2. a kind of digitized integrated protector for electric motor according to claim 1; It is characterized in that also comprising the PTC thermistor that is embedded in the motor winding; Said PTC thermistor is connected with CPU, for CPU provides motor real-time temperature signal.
3. a kind of digitized integrated protector for electric motor according to claim 2; It is characterized in that also comprising the connection CPU, the LCD display unit that the current of electric after the central processing unit for processing, PTC resistance, motor status and system status signal are shown; And CPU carried out the key circuit that the input of some control commands and parameter are imported.
4. a kind of digitized integrated protector for electric motor according to claim 1 is characterized in that the contact of said control output relay control is separately positioned in the input power supply of warning circuit, motor input power supply and brake.
5. a kind of digitized integrated protector for electric motor according to claim 1 is characterized in that also being provided with Profibus Dp from station interface.
6. a kind of digitized integrated protector for electric motor according to claim 1; Drive controlling output relay action when it is characterized in that the action of the unusual output relay of said central processing unit controls; The control warning circuit is reported to the police, and breaks off motor power and brake power supply.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120313098.8U CN202197091U (en) | 2011-08-25 | 2011-08-25 | Digital motor comprehensive protector |
| CN201110246911.9A CN102340127B (en) | 2011-08-25 | 2011-08-25 | Digitalized comprehensive motor protector |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120313098.8U CN202197091U (en) | 2011-08-25 | 2011-08-25 | Digital motor comprehensive protector |
| CN201110246911.9A CN102340127B (en) | 2011-08-25 | 2011-08-25 | Digitalized comprehensive motor protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102340127A true CN102340127A (en) | 2012-02-01 |
| CN102340127B CN102340127B (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120313098.8U Expired - Fee Related CN202197091U (en) | 2011-08-25 | 2011-08-25 | Digital motor comprehensive protector |
| CN201110246911.9A Active CN102340127B (en) | 2011-08-25 | 2011-08-25 | Digitalized comprehensive motor protector |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120313098.8U Expired - Fee Related CN202197091U (en) | 2011-08-25 | 2011-08-25 | Digital motor comprehensive protector |
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| Country | Link |
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| CN (2) | CN202197091U (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102684159A (en) * | 2012-04-27 | 2012-09-19 | 深圳奥士达电子有限公司 | Control circuit and control method for motor of paper shredder |
| CN103647254A (en) * | 2013-12-07 | 2014-03-19 | 湖南省凯盈科技有限公司 | Overtemperature and overcurrent protection module with manual reset in charged state |
| CN104332954A (en) * | 2013-07-22 | 2015-02-04 | 依必安-派特穆尔芬根股份有限两合公司 | Circuit for Thermal Protection and Power Regulation of Electric Motors |
| WO2015081576A1 (en) * | 2013-12-07 | 2015-06-11 | 湖南省凯盈科技有限公司 | Electrically chargeable overtemperature/overcurrent protection module |
| CN104852356A (en) * | 2014-02-17 | 2015-08-19 | 伊顿公司 | Motor control protector |
| CN105226614A (en) * | 2015-09-29 | 2016-01-06 | 北京航天发射技术研究所 | Safe and reliable DC motor control system and control method |
| CN105429103A (en) * | 2015-12-31 | 2016-03-23 | 温州佳华仪表电气科技有限公司 | Three-phase motor protector |
| CN106219407A (en) * | 2016-08-22 | 2016-12-14 | 江苏中建达丰机械工程有限公司 | Derrick crane drive system thermal detector |
| CN109672394A (en) * | 2019-01-17 | 2019-04-23 | 玖龙纸业（太仓）有限公司 | A kind of electric machine control system IO failure delay process device |
| CN111207940A (en) * | 2020-01-14 | 2020-05-29 | 苏州中车轨道交通车辆有限公司 | Subway wheel reversal detection device and method |
| CN113131441A (en) * | 2019-12-31 | 2021-07-16 | 施耐德电气工业公司 | Motor protector and method for operating a motor protector |
| CN113955642A (en) * | 2021-09-24 | 2022-01-21 | 广东省特种设备检测研究院珠海检测院 | Abnormal power-loss fault protection method for motor stator of crane hoisting mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684159A (en) * | 2012-04-27 | 2012-09-19 | 深圳奥士达电子有限公司 | Control circuit and control method for motor of paper shredder |
| CN104332954A (en) * | 2013-07-22 | 2015-02-04 | 依必安-派特穆尔芬根股份有限两合公司 | Circuit for Thermal Protection and Power Regulation of Electric Motors |
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| CN103647254A (en) * | 2013-12-07 | 2014-03-19 | 湖南省凯盈科技有限公司 | Overtemperature and overcurrent protection module with manual reset in charged state |
| WO2015081576A1 (en) * | 2013-12-07 | 2015-06-11 | 湖南省凯盈科技有限公司 | Electrically chargeable overtemperature/overcurrent protection module |
| CN104852356A (en) * | 2014-02-17 | 2015-08-19 | 伊顿公司 | Motor control protector |
| CN104852356B (en) * | 2014-02-17 | 2018-09-21 | 伊顿公司 | The control protective unit of motor |
| CN105226614B (en) * | 2015-09-29 | 2018-07-10 | 北京航天发射技术研究所 | safe and reliable DC motor control system and control method |
| CN105226614A (en) * | 2015-09-29 | 2016-01-06 | 北京航天发射技术研究所 | Safe and reliable DC motor control system and control method |
| CN105429103A (en) * | 2015-12-31 | 2016-03-23 | 温州佳华仪表电气科技有限公司 | Three-phase motor protector |
| CN106219407A (en) * | 2016-08-22 | 2016-12-14 | 江苏中建达丰机械工程有限公司 | Derrick crane drive system thermal detector |
| CN109672394A (en) * | 2019-01-17 | 2019-04-23 | 玖龙纸业（太仓）有限公司 | A kind of electric machine control system IO failure delay process device |
| CN109672394B (en) * | 2019-01-17 | 2021-11-02 | 玖龙纸业（太仓）有限公司 | IO fault delay processing device of motor control system |
| CN113131441A (en) * | 2019-12-31 | 2021-07-16 | 施耐德电气工业公司 | Motor protector and method for operating a motor protector |
| CN113131441B (en) * | 2019-12-31 | 2024-01-30 | 施耐德电气工业公司 | Motor protector and method for operating motor protector |
| CN111207940A (en) * | 2020-01-14 | 2020-05-29 | 苏州中车轨道交通车辆有限公司 | Subway wheel reversal detection device and method |
| CN113955642A (en) * | 2021-09-24 | 2022-01-21 | 广东省特种设备检测研究院珠海检测院 | Abnormal power-loss fault protection method for motor stator of crane hoisting mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN202197091U (en) | 2012-04-18 |
| CN102340127B (en) | 2014-06-25 |
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