CN100413170C - Electric motor control protector - Google Patents
Electric motor control protector Download PDFInfo
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- CN100413170C CN100413170C CNB2004100892081A CN200410089208A CN100413170C CN 100413170 C CN100413170 C CN 100413170C CN B2004100892081 A CNB2004100892081 A CN B2004100892081A CN 200410089208 A CN200410089208 A CN 200410089208A CN 100413170 C CN100413170 C CN 100413170C
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Abstract
The present invention reveals an electric motor control protector which is connected to the working circuit of an electric motor in series and comprises a circuit breaker, a contactor, a current monitoring module and a control protection module, wherein the control protection module is connected with the current monitoring module, the circuit breaker and the contactor and is also connected to a computer network; the control protection module receives a signal which is output by the current monitoring module, converts the signal into a digital signal for calculation, also receives a control command from the computer network and combines a result which is calculated according to the digital signal and the received control command to generate an instruction and then output the instruction to the circuit breaker and the contactor; moreover, the control protection module also receives working condition signals of the circuit breaker and the contactor and uploads the working condition signals by the computer network. The technical scheme of the present invention integrates various control and protection functions, such as overload, phase failure, three-phase unbalance, thermal sensitive protection, short circuit protection, etc., originally realized by each separated element and integrates the various control and protection functions into a device for the compatible fit of the protection characteristics, and moreover, comprehensive data communication can be realized.
Description
Technical field
The present invention relates to motor protecting device, more particularly, but relate to the electric motor control protector of a kind of integrated protection, control communication function.
Background technology
At present, to short circuit, overload, open phase protection and the frequent intellectuality control of motor, the general components and parts that separate that adopt are realized, because each element can only be realized part of functions wherein, therefore, adopt following several compound modes often both at home and abroad:
Circuit breaker+contactor+the thermal relay (motor protector) (1) of can communicating by letter
Or: the circuit breaker+contactor+motor protector (2) of can communicating by letter
Or: the circuit breaker+contactor+thermal relay (motor protector) (3) of can communicating by letter
From top several compound modes as can be seen, the device that promptly adopts separating component to constitute, but especially in the communicator, often in several separating components, have only one and have communication function, but the communicator of Gou Chenging like this, when carrying out data communication, will lack a part of data and information.For in the field of motor protection, when employing mode (1), can only be to the state of circuit breaker, information such as data communicate, the host computer of being responsible for controlling (but generally being to communicate with wherein communication component by computer network) can only be seen and can communicate by letter short trouble that circuit breaker write down and can't see the overload of being protected and being write down by thermal relay (motor protector), faults such as the phase failure, and can't and break by the logical of PC control contactor, and the break-make of Long-distance Control contactor is so prerequisite basic function of system; During employing mode (2), then host computer can only be seen faults such as overload that motor protector protects and write down, the phase failure, and can't observe and record the be short-circuited situation of protection of circuit breaker, also can't the Long-distance Control contactor and with branch; When employing mode (3), all failure conditions can't be seen and write down to the break-make that host computer can only the Long-distance Control contactor; Obviously, above-mentioned three kinds of modes all are incomplete, if but in order to adopt above three kinds of separating components to constitute complete comprehensively communications protection device, and the whole components and parts that can communicate by letter of employing, that is:
Circuit breaker+the contactor of can the communicating by letter+motor protector (4) of can communicating by letter of can communicating by letter
Clearly; employing method (4); not only communication data repeats (but as information such as line current can be in three communicating appliances repeated sampling and record) in a large number; and cause repetition and waste (as may have three current transformers that are used to gather current signal) from hardware; in addition, can not guarantee three kinds of cooperation between the components and parts protective feature.
So, for existing technology, just be sought after a kind of can be comprehensively and image data and the device that communicates effectively, it can comprehensively be gathered the data of above-mentioned three aspects, can select the information that wherein repeats again, avoid the situation of repetition and waste to occur.
Summary of the invention
But the electric motor control protector that the purpose of this invention is to provide a kind of integrated protection, control communication function; the element of realizing above-mentioned circuit breaker, contactor, motor protector and communication device function is reconfigured; be integrated in the equipment, thereby realize cooperation between the various functions.
According to the present invention, a kind of electric motor control protector is provided, be serially connected with the motor operating circuit, comprising: circuit breaker, be serially connected in the main circuit of motor, when taking place, short trouble disconnects main circuit; Contactor is serially connected in the main circuit of motor, has closed and the disconnection two states; The current monitoring module is monitored the three-phase current of described motor main circuit and is exported corresponding signal; And control protection module, link to each other with contactor with described current monitoring module, circuit breaker, be also connected to computer network, the signal of described control protection module received current monitoring modular output also converts digital signal to and calculates, analyzes (as judge whether to transship, faults such as the phase failure, three-phase imbalance), also receive control command, produce instruction and export described circuit breaker and contactor to according to digital signal result calculated and the control command that receives in conjunction with described from described computer network; Described control protection module also receives the working state signal of described circuit breaker and contactor and uploads by computer network.The data of uploading can also comprise a lot of circuit parameters such as voltage, electric current, power factor etc., and the controller protection module can also carry out parameter setting, as rated operational current, dropout grade.
According to one embodiment of present invention, described control protection module comprises: forceful electric power assembly, light current assembly and information exchange component, and wherein the forceful electric power assembly comprises transformer, is connected to the 220V AC power, the output low-voltage supply; Rectification filtering voltage stabilizing circuit links to each other with the output of described transformer, and working power is further carried out rectification, filtering and voltage stabilizing, exports first, second and tertiary voltage; Relay receives the tertiary voltage that described rectification filtering voltage stabilizing circuit is exported, and output order is to described circuit breaker and contactor; The light current assembly comprises, sample circuit receives second voltage that described rectification filtering voltage stabilizing circuit is exported, and is connected to described current monitoring module, and the electric current of current monitoring module monitors is sampled; Controller receives first voltage that described rectification filtering voltage stabilizing circuit is exported, and is also connected to the sampling output that described sample circuit receives described sample circuit; Described controller also receives the working state signal of described circuit breaker and contactor; Alarm links to each other with described controller, alarms according to the indication of controller; And information exchange component comprises, display links to each other with described controller, according to the indicated number of controller; Input unit links to each other with described controller, receives input instruction and is transferred to controller; Communication interface, link to each other with described controller, can carry out two-way communication, be also connected to computer network, to be transferred to controller by the control command of computer network transmission, also the circuit breaker that controller is received and the working state signal of contactor upload to computer network.
According to one embodiment of the invention, first, second of described rectification filtering voltage stabilizing circuit output and tertiary voltage are respectively 5V, 9V and 12V.
According to one embodiment of the invention, described alarm is a buzzer, is an indicator light in another embodiment.
Communication interface of the present invention can directly be connected to computer network by the MODBUS bus.Perhaps, described communication interface can be connected to a communication adapter earlier, and described communication adapter is connected to computer network by DeviceNet bus or ProfiBus bus again.
Among the present invention, link to each other by Shielded Twisted Pair between described control protection module and the described current monitoring module.
Adopt the electric motor control protector of technical scheme of the present invention integrated various control and defencive functions such as the overload that realizes of the element of former each separation of cause, the phase failure, three-phase imbalance, temperature-sensitive protection, short-circuit protection; and after being integrated in them in the device; above-mentioned protective feature energy cooperation; and can realize comprehensive data communication; have easy to use, perfect, the reliability advantages of higher of control defencive function, be specially adapted to intelligent degree higher system.
Description of drawings
The above and other feature of the present invention and advantage will be below become more obvious after in conjunction with the accompanying drawings and embodiments the description, and identical in the accompanying drawings mark is represented identical feature, wherein,
Fig. 1 is the structured flowchart according to electric motor control protector of the present invention;
Fig. 2 is the electrical schematic diagram according to electric motor control protector of the present invention;
Fig. 3 is the structured flowchart according to the control protection module in the electric motor control protector of the present invention;
Fig. 4 is the workflow diagram according to electric motor control protector of the present invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
That the present invention provides is a kind of centralized control and defencive function, that have single intelligent controller, communication data complete electric motor control protector comprehensively; it is integrated in a plurality of elements in the device; kinds of protect function and controlled function can be arranged and make these orthofunctions cooperate; simultaneously; this device also has special communicator, is the function that this device can be realized " remote regulating ", " remote control ", " remote measurement ", " remote signalling ".
For achieving the above object, the invention provides a kind of electric motor control protector, Fig. 1 shows the block diagram of this kind device, and this device 100 is serially connected with the motor operating circuit, comprising:
Fig. 2 shows electrical principle Figure 200 of electric motor control protector of the present invention; in Fig. 2; 102 is circuit breaker; 104 is contactor; 106 is the current monitoring module; 108 are the control protection module; 226 working power inputs for control protection module 108; 208 is in order to connect the Shielded Twisted Pair of control protection module 108 and current monitoring module 106; current monitoring module 106 is sent into control protection module 108 with the three-phase current signal in its motor main circuit that monitors by twisted-pair feeder 208; control protection module 108 further is processed into current sampling signal digital signal and carries out corresponding calculated; judgment task, controlling protection module 108 afterwards also can be according to aforementioned calculation; result who judges and the control command that receives produce instruction and export circuit breaker 102 to and contactor 104 (internal structure about control protection module 108 will be discussed in further detail below).
Another function of also having of control protection module 108 is to have a communication function, and it is realized and the communicating by letter of network by communication interface 216, in general, mainly is to communicate with the host computer 238 that is connected on the network.The content of communication comprises two aspects, and the first receives the control command from host computer, afterwards by above-mentioned output contact 218 and 220 and control circuit breaker 102 and contactor 104 respectively to the output contact 222 of contactor 104 to circuit breaker 102.Uploading for the working state signal of reception circuit breaker 102 and contactor 104 and by computer network on the other hand of Content of Communication.For example, the contact 212 shown in Fig. 2 is exactly the work state information that is used to receive contactor 104, and contact 210 also can be used to receive the work state information of circuit breaker 102.Communication bus 236 for the use between communication interface 216 and the network (host computer 238), can directly use the MODBUS bus, also can at first be connected to a communication adapter (not shown), be connected to buses such as DeviceNet, ProfiBus by communication adapter, to carry out various signal transmission, monitoring, control and to set.The data of uploading can also comprise a lot of circuit parameters such as voltage, electric current, power factor etc., and the controller protection module can also carry out parameter setting, as rated operational current, dropout grade.
Electrical principle in conjunction with electric motor control protector of the present invention is illustrated above, is described at the concrete structure in conjunction with the control protection module 108 among the present invention below.From hard-wired angle, the control protection module 108 among the present invention can be divided into following assembly, as shown in Figure 3:
Forceful electric power assembly 302 comprises, transformer 304 is connected to the 220V AC power, the output low-voltage supply; Rectification filtering voltage stabilizing circuit 306, link to each other with the output of transformer 304, working power is further carried out rectification, filtering and voltage stabilizing, export first, second and tertiary voltage, these three voltages are respectively the working powers of controller 314, sample circuit 312 and the relay 308 that will describe as the back.Another components and parts in the forceful electric power assembly 302 are relays 308, receive the tertiary voltage of rectification filtering voltage stabilizing circuit output, and what use is the operating voltage of 12V herein, and relay 308 meeting output orders are to circuit breaker 102 and contactor 104;
Light current assembly 310, comprise, sample circuit 312, receive second voltage of rectification filtering voltage stabilizing circuit output, the voltage that is 9V herein is also connected to current monitoring module 106 as operating voltage, and the current signal of the main circuit of its monitoring of received current monitoring modular 106 output is also sampled to current signal, the output of sample circuit 312 is connected to controller 314 to be further processed, and links to each other by Shielded Twisted Pair between sample circuit 312 and the current monitoring module 106.Controller 314 receives first voltage that rectification filtering voltage stabilizing circuit is exported, and the voltage that is 5V herein is also connected to sample circuit 312 as operating voltage, receives the sampling output of sample circuit 312; Controller 314 also receives the working state signal of circuit breaker 102 and contactor 104.Also comprise alarm 316 in the light current assembly 310, link to each other that alarm according to the indication of controller 314, alarm 316 can use buzzer, also can use indicator light with controller 314.
Fig. 4 is the workflow schematic diagram of electric motor control protector of the present invention, and as shown in Figure 4, device of the present invention is substantially according to following works:
S11. initialization step carries out initialization to controller, communication interface, display, input unit, sample circuit in the device;
S12. sampling and switch process are sampled to the three-phase circuit parameter in the main circuit and are input in the controller by sample circuit, and controller carries out mould/number conversion it is become digital signal;
S13. the effective value calculation procedure is carried out effective value to the signal of sampling and is calculated;
S14. fault verification step, in this step, transship judgement, unevenly judge and the phase failure judges that the sequencing of these three judgements does not need to fix that wherein any one judgement is broken down and all will be made release produce the instruction of threading off;
Above-mentioned step S11-S14 adds that the step S16 that will describe the back constitutes the main work flow of this electric motor control protector jointly; in this process; controller can also respond various interruptions and carry out interrupt routine; interrupt routine carries out in step S15; owing to interrupt and to take place at any time; therefore interrupt flow process and be not included in the main flow, but it should be appreciated by those skilled in the art that interrupt step S15 also is the part of electric motor control protector workflow of the present invention.
S15. interrupt response step; in this step; whether will detect has interrupt requests to produce; the interrupt requests that produces can comprise, interrupts and the timer interruption from the communication disruption of communication interface, the heat protection interruption of PTC thermal protector generation (identical with prior art), interruption, the current zero-crossing point that input unit (as keyboard) produces.Wherein, for communication disruption, generally be when host computer has control command to arrive, to produce, therefore, after receiving communication disruption, the controller receiving data frame, it is carried out CRC check, and the instruction in the fill order frame afterwards also sends the frame that responds in needs.For other four kinds interruptions, receive the heat protection and interrupt then carrying out the operation of threading off; The response that receives input unit is interrupted then entering the process that receives the keyboard input, receives current zero-crossing point and interrupts then starting timer, receives timer and interrupts then execute protection program.
S16. step display shows state, data, the fault of electric motor control protector in the abovementioned steps, with the prompting user on display.
The duration of work of above-mentioned step S12-S16 meeting electric motor control protector can carry out repeatedly.
Adopt the electric motor control protector of technical scheme of the present invention integrated various control and defencive functions such as the overload that realizes of the element of former each separation of cause, the phase failure, three-phase imbalance, temperature-sensitive protection, short-circuit protection; and after being integrated in them in the device; above-mentioned protective feature energy cooperation; and can realize comprehensive data communication; have easy to use, perfect, the reliability advantages of higher of control defencive function, be specially adapted to intelligent degree higher system.
The foregoing description provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (7)
1. an electric motor control protector is serially connected with the motor operating circuit, it is characterized in that, comprising:
Circuit breaker is serially connected in the main circuit of motor, disconnects main circuit when short trouble takes place;
Contactor is serially connected in the main circuit of motor, has closed and the disconnection two states;
The current monitoring module is monitored the three-phase current of described motor main circuit and is exported corresponding signal;
The control protection module, link to each other with contactor with described current monitoring module, circuit breaker, be also connected to computer network, the signal of described control protection module received current monitoring modular output also converts digital signal to and calculates, analyzes, also receive control command, produce instruction and export described circuit breaker and contactor to according to digital signal result calculated and the control command that receives in conjunction with described from described computer network; Described control protection module also receives the working state signal of described circuit breaker and contactor and uploads by computer network; Wherein said control protection module comprises:
The forceful electric power assembly comprises,
Transformer is connected to the 220V AC power, the output low-voltage supply;
Rectification filtering voltage stabilizing circuit links to each other with the output of described transformer, and is further to working power
Carry out rectification, filtering and voltage stabilizing, export first, second and tertiary voltage;
Relay receives the tertiary voltage that described rectification filtering voltage stabilizing circuit is exported, and output order is to described circuit breaker and contactor;
The light current assembly comprises,
Sample circuit receives second voltage that described rectification filtering voltage stabilizing circuit is exported, and is connected to described current monitoring module, and the electric current of current monitoring module monitors is sampled;
Controller receives first voltage that described rectification filtering voltage stabilizing circuit is exported, and is also connected to the sampling output that described sample circuit receives described sample circuit; Described controller also receives the working state signal of described circuit breaker and contactor;
Alarm links to each other with described controller, alarms according to the indication of controller;
Information exchange component comprises,
Display links to each other with described controller, according to the indicated number of controller;
Input unit links to each other with described controller, receives input instruction and is transferred to controller;
Communication interface be connected with described controller, but two-way communication is also connected to computer network,
To be transferred to controller by the control command of computer network transmission, what also controller is received is disconnected
The working state signal of road device and contactor uploads to computer network.
2. electric motor control protector as claimed in claim 1 is characterized in that, first, second of described rectification filtering voltage stabilizing circuit output and tertiary voltage are respectively 5V, 9V and 12V.
3. electric motor control protector as claimed in claim 1 is characterized in that, described alarm is a buzzer or indicator light.
4. electric motor control protector as claimed in claim 1 is characterized in that described communication interface is connected to computer network by the MODBUS bus.
5. electric motor control protector as claimed in claim 1 is characterized in that described communication interface is connected to a communication adapter, and described communication adapter is connected to computer network by the DeviceNet bus.
6. electric motor control protector as claimed in claim 1 is characterized in that described communication interface is connected to a communication adapter, and described communication adapter is connected to computer network by the ProfiBus bus.
7. as each described electric motor control protector in the claim 1 to 6, it is characterized in that, link to each other by Shielded Twisted Pair between described control protection module and the described current monitoring module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100892081A CN100413170C (en) | 2004-12-08 | 2004-12-08 | Electric motor control protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100892081A CN100413170C (en) | 2004-12-08 | 2004-12-08 | Electric motor control protector |
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| CN1625011A CN1625011A (en) | 2005-06-08 |
| CN100413170C true CN100413170C (en) | 2008-08-20 |
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| CNB2004100892081A Active CN100413170C (en) | 2004-12-08 | 2004-12-08 | Electric motor control protector |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383497B (en) * | 2007-09-06 | 2011-04-27 | 张文航 | Electric safety press-key control apparatus |
| CN102290791A (en) * | 2010-06-18 | 2011-12-21 | 上海华建电力设备股份有限公司 | Method of protecting breaking capacity of contactor |
| CN103532088A (en) * | 2013-10-25 | 2014-01-22 | 田景洵 | Short-circuit resistance self-reset electronic circuit breaker |
| CN103955246B (en) * | 2014-05-12 | 2016-03-02 | 珠海格力电器股份有限公司 | Electric heater control system and method |
| CN105098717B (en) * | 2014-05-20 | 2018-10-09 | 施耐德电气工业公司 | Contactor guard method and device |
| CN110556917B (en) * | 2018-05-31 | 2023-08-18 | 上海航空电器有限公司 | Continuous undetermined power source protection structure of aircraft generator controller GCU |
| CN114421441A (en) * | 2021-12-30 | 2022-04-29 | 天津市中力神盾电子科技有限公司 | Switching circuit |
| CN114421811A (en) * | 2022-01-26 | 2022-04-29 | 帝森克罗德集团有限公司 | Protection control system for direct starting of motor |
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| US5657193A (en) * | 1996-01-26 | 1997-08-12 | General Electric Company | Electronic control module for motor controller units |
| US5955859A (en) * | 1995-04-03 | 1999-09-21 | Schneider Electric Sa | Interface module between a field bus and electrical equipment controlling and protecting an electric motor |
| CN2563807Y (en) * | 2002-07-05 | 2003-07-30 | 保定市众诚电气有限公司 | Low voltage motor intelligent control protector of power supply system |
| CN2590236Y (en) * | 2002-12-30 | 2003-12-03 | 上海电器科学研究所 | Modularized communicating intelligent motor protection |
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2004
- 2004-12-08 CN CNB2004100892081A patent/CN100413170C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5955859A (en) * | 1995-04-03 | 1999-09-21 | Schneider Electric Sa | Interface module between a field bus and electrical equipment controlling and protecting an electric motor |
| US5657193A (en) * | 1996-01-26 | 1997-08-12 | General Electric Company | Electronic control module for motor controller units |
| CN2563807Y (en) * | 2002-07-05 | 2003-07-30 | 保定市众诚电气有限公司 | Low voltage motor intelligent control protector of power supply system |
| CN2590236Y (en) * | 2002-12-30 | 2003-12-03 | 上海电器科学研究所 | Modularized communicating intelligent motor protection |
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Owner name: SHANGHAI DIANKE SCIENCE CO., LTD. Free format text: FORMER OWNER: SHANGHAI ELECTRICAL APPLIANCES SCIENCE INST. (GROUP) CO., LTD. Effective date: 20090807 |
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Effective date of registration: 20090807 Address after: No. 505, Wuning Road, Shanghai Patentee after: Shanghai Electrical Apparatus Research Institute Co., Ltd. Address before: No. 505, Wuning Road, Shanghai Patentee before: Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. |