CN203367997U - Intelligent motor protector - Google Patents
Intelligent motor protector Download PDFInfo
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- CN203367997U CN203367997U CN 201320478745 CN201320478745U CN203367997U CN 203367997 U CN203367997 U CN 203367997U CN 201320478745 CN201320478745 CN 201320478745 CN 201320478745 U CN201320478745 U CN 201320478745U CN 203367997 U CN203367997 U CN 203367997U
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Abstract
The utility model relates to an automatic control and motor protection apparatus, and discloses an intelligent motor protector. The intelligent motor protector includes a current sampling circuit, a power supply circuit, a voltage sampling circuit, a signal processing unit, a central processing unit and a control module. The intelligent motor protector is advantageous in being concise in structure, high in current setting and sampling precision, being capable of displaying current values in real time during the running of a motor, having the functions of overvoltage protection, under-voltage protection, short-circuit protection, three-phase imbalance protection, and remote communication, and having higher practical value.
Description
Technical field
The utility model relates to automation control and motor protecting device, particularly a kind of intelligent motor protector.
Background technology
The effect of motor protector is comprehensively to protect control to motor, when motor occurs that overcurrent, undercurrent, disconnected phase, stall, short circuit, overvoltage, under-voltage, electric leakage, three-phase imbalance, overheated, ground connection, bearing wear, rotor are eccentric, winding is aging is reported to the police or protect control.Appearance due to the production automation and various automatic control, sequential control equipment, motor is for a long time in the frequent switching state in modes such as starting, braking, rotating, intermittence and varying duties, in addition, the service requirement of motor is more and more higher, running environment is also more and more harsher, and structure and the quality of motor are had higher requirement.Simultaneously, because motor and supporting machinery connect together, when motor breaks down; often involve and produce system; in order to reduce the generation of electrical fault, to prevent trouble before it happens, it is also a vital task that guarantees the production system normal operation that motor is carried out to effective protection.
The motor protection phase in the market is analog electrical minor motor protector, and existence is adjusted, and precision is not high, sampling precision is not high, and function singleness, can't give motor to have multi-protective function in the omnibearing protection of one.Development along with microelectric technique; motor protector is just towards intellectuality, synthesization, high accuracy, highly reliable future development; by some other, more advanced technical products replaces the motor protector of pure analog line just gradually; therefore be necessary to design and aly can overcome above-mentioned defect, there is the protector for electric motor of degree of precision and multi-protective function.
Summary of the invention
The utility model is not high for precision in prior art, and the shortcoming of function singleness provides a kind of novel intelligent motor protector.
For achieving the above object, the utility model can be taked following technical proposals:
Intelligent motor protector, comprise current sampling circuit, power circuit, voltage sampling circuit, signal processing unit, CPU and control module, wherein, three live wires that current sampling circuit is used current sensor to connect respectively motor carry out current sample, the output of power circuit connects voltage sampling circuit, the output of current sampling circuit and voltage sampling circuit is connected signal processing unit, signal processing unit comprises accurate half-wave rectifying circuit and operational amplifier, accurate half-wave rectifying circuit is carried out rectification to sampled signal, the sampled signal of operational amplifier after to rectification amplified, the output of signal processing unit connects the sample port of CPU, the output link control module of CPU, control module is used for the on off state of control relay to control the running status of motor, CPU adopts the STM8S105S4T6 single-chip microcomputer.
As preferably, described power circuit comprises three-terminal voltage-stabilizing diode, photoelectrical coupler, inverse-excitation type single-chip switching power supply chip, wherein, the negative electrode of three-terminal voltage-stabilizing diode is connected with the negative electrode of photoelectrical coupler, the emitter of photoelectrical coupler is connected with the control utmost point of inverse-excitation type single-chip switching power supply chip, the three-terminal voltage-stabilizing diode adopts TL431, and photoelectrical coupler adopts PC817, and inverse-excitation type single-chip switching power supply chip is the TOP224YN chip.
As preferably, also comprise switching value input circuit, analogue quantity output circuit, display unit and communication module, wherein, the output of switching value input circuit connects the switching value input of CPU, display unit, analogue quantity output circuit is connected with CPU respectively with communication module, switching value input circuit is for monitoring and the motor starting of user's input or the input of stop signal of relay switch state, analogue quantity output circuit is for the output of the sampled signal after signal processing unit processes, display unit adopts the mode of dynamic scan, circulation shows the sampled signal of motor three-phase current and voltage, communication module adopts RS485 communication interface and Modbus-RTU communications protocol, for the digital remote communication, control and monitoring.
As preferably, described current sensor is clamping structure.
Intelligent motor protector adopts High Performance SCM STM8S105S4T6 as kernel control chip, this single-chip microcomputer is based on the microcontroller of 8 frame structures, its CPU core has 6 internal registers, can carry out efficiently the data processing by these registers, single-chip microcomputer provides the Flash program storage that capacity is the 16K byte, inner integrated real EEPROM data storage, can reach the erase-write cycles of 300,000 times, there is powerful I/O function, the failure code that can produce the nearest action of threading off for 3 times of motor protector is carried out record, the independent house dog that simultaneously also has discrete clock source.
The utility model, owing to having adopted above technical scheme, has significant technique effect:
There is multi-protective function, can carry out to motor the various faults protections such as overcurrent, stall, three-phase current unbalance, disconnected phase, overvoltage, under-voltage, ground connection, underload, short circuit.In addition; also there is set-up function; can set the multiple settings such as rated current, under-voltage value, overpressure value, trip grade code name, three-phase current unbalance rate, locked rotor current multiple, earth current value, current transformer ratio coefficient value, underload electric current and the setting current percentage of motor protector, underload operate time, address; simplified adjustment process; improved the compatibility of protector; make motor protector be applied on multiple motor, certainty of measurement is high, good linearity, fault are differentiated accurately and reliably, antijamming capability is strong.
Complete machine adopts modular construction, and wherein other part partial installations of current sensor and protector, be convenient to practical application.
Further; adopt high-definition digital LED to show; display unit can circulate and show A, B, C three-phase electricity flow valuve; overcurrent, overvoltage, under-voltage, ground value memory demonstration during guard mode; and show that each fault character and set point etc. are multiple when state is set and show intuitively output, man-machine interface is more friendly.
Communication module has 4-20mA electric current output interface and RS485 communication interface (supporting the Modbus-rtu communications protocol); realized and host computer (PC) between digital signal transmit; a host computer (PC) can be simultaneously carries out communication with 255 motor protectors nearly; and it is carried out to remote real-time monitoring and setting parameter, be convenient to automatic management.
In addition, adopt the interior memory technology of sheet, after power down, setup parameter is preserved memory, must not reset, and CPU can also record the failure code of the nearest action generation of threading off for 3 times of motor protector, and the personnel of maintaining easily check and overhaul.
Current sensor adopts clamping structure, installs and must not dismantle major loop, improves on-the-spot installation effectiveness.
The accompanying drawing explanation
The circuit diagram that Fig. 1 is embodiment 1 described CPU.
The circuit diagram that Fig. 2 is embodiment 1 described analogue quantity output circuit.
The circuit diagram that Fig. 3 is embodiment 1 described current detection circuit.
The circuit diagram that Fig. 4 is the described zero sequence testing circuit of embodiment 1.
The circuit diagram that Fig. 5 is embodiment 1 described voltage sampling circuit.
The circuit diagram that Fig. 6 is embodiment 1 described display unit.
The circuit diagram that Fig. 7 is embodiment 1 described power circuit.
The circuit diagram that Fig. 8 is embodiment 1 described switching value input circuit.
The structural representation that Fig. 9 is embodiment 1 described motor protector.
The circuit diagram that Figure 10 is embodiment 1 described control relay circuit.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail.
Intelligent motor protector, as shown in Figure 9, comprise current sampling circuit 1, power circuit 2, voltage sampling circuit 3, signal processing unit 4, CPU 5 and control module 6, wherein, three live wires that current sampling circuit 1 is used current sensor 7 to connect respectively motor carry out current sample, the output of power circuit 2 connects voltage sampling circuit 3, the output of current sampling circuit 1 and voltage sampling circuit 3 is connected signal processing unit 4, signal processing unit 4 comprises accurate half-wave rectifying circuit and operational amplifier, accurate half-wave rectifying circuit is carried out rectification to sampled signal, the sampled signal of operational amplifier after to rectification amplified, the output of signal processing unit 4 connects the sample port of CPU 5, the output link control module 6 of CPU 5, control module 6 for the on off state of control relay to control the running status of motor, CPU 5 adopts the STM8S105S4T6 single-chip microcomputer.
Wherein the circuit diagram of CPU 5 as shown in Figure 1,22, No. 23 pin link control modules 6, the on off state of control relay.No. 24 pins of single-chip microcomputer are that the PWM port is connected with the input of analogue quantity output circuit 9, for transportation simulator amount signal.No. 25 pins are the PP1 port, and the output of connecting valve amount input circuit 8, for the input of external switch amount signal.No. 27 pins are the SCLK port, for the connection data input clock.No. 30 pins are the MOSI interface.37,39-41, No. 44 pins are the LED output, connect the 1-5 pin of the U2 chip of display unit 10.42, No. 43 pins are TXD, RXD port, and connecting communication module 11, transmit for communication signal.The 19-21 pin connects the output of current sampling circuit 1, be used for the input of the sampled signal of three-phase current, No. 18 pins connect the output of zero sequence testing circuit, be used for the input of the sampled signal of zero-sequence current, No. 17 ports connect the output of voltage sampling circuits 3, for the input of the voltage sampling signal of motor.
Described power circuit 2 as shown in Figure 7, comprise three-terminal voltage-stabilizing diode U5, photoelectrical coupler U4, inverse-excitation type single-chip switching power supply chip U2, also comprise high frequency transformer EPC19, wherein, 3 pin of three-terminal voltage-stabilizing diode U5 are connected with the negative electrode of photoelectrical coupler U4, the emitter of photoelectrical coupler U4 is connected with the control utmost point of inverse-excitation type single-chip switching power supply chip U2, the emitter of photoelectrical coupler U4 is connected with the control utmost point of inverse-excitation type single-chip switching power supply chip U2, also be in series with the resistance R 1 of a 100R between the control utmost point of the emitter of photoelectrical coupler U4 and inverse-excitation type single-chip switching power supply chip U2, three-terminal voltage-stabilizing diode U5 adopts TL431, be in series with 104 electric capacity between 1 pin of three-terminal voltage-stabilizing diode U5 and 3 pin.Photoelectrical coupler adopts the PC817 chip, its 1 pin is in series with the resistance of a 100R, 4 pin connect the negative electrode of high efficiency rectification diode HER206, the feedback winding of the anodic bonding EPC19 of high efficiency rectification diode HER206, the other end of feedback winding connects the negative electrode of capacitor C 15,1 pin of the anodic bonding U2 of capacitor C 15, also be in series with a capacitor C 12 between 4 pin of the other end of this feedback winding and U4; Inverse-excitation type single-chip switching power supply chip U2 is the TOP224YN chip, its 3 pin connects the main winding of EPC19, be provided with high efficiency rectification diode HER206 and Transient Suppression Diode P6KE200CA between two pins of the main winding of EPC19, the negative electrode of high efficiency rectification diode HER206 is connected with the negative electrode of Transient Suppression Diode P6KE200CA.Adopt Switching Power Supply, the input voltage of main winding is AC185V～265V, EPC19 also is provided with 4 groups of secondary winding, 11 pin of secondary winding connect the anode of high efficiency rectification diode D2, be parallel with capacitor C 5 and C10 between 10 pin of the negative electrode of D2 and secondary winding, the output of the anode of D2 for relay+the 12V output voltage.Secondary winding 9 pin connect the anode of high efficiency rectification diode D3, D3 adopts HER206, be parallel with capacitor C 6 and circuit of three-terminal voltage-stabilizing integrated U3 between 8 pin of the negative electrode of D3 and EPC19, U3 adopts the L7805 chip, 8 pin of EPC19 connect the earth terminal of U3, the input of the anodic bonding U3 of D3, shunt capacitance C7 and C11 between the output of U3 and earth terminal, the output output of U3 is for the 5V voltage of communicating circuit.5 pin of secondary winding connect the anode of high efficiency rectification diode D5, D5 adopts HER206, be parallel with capacitor C 8, C9 and C14 between 6 pin of the negative electrode of D5 and secondary winding, rear conduct of inductance L 2 of the negative electrode of D5 series connection to CPU, LM324 chip power supply+the 5V output voltage.7 pin of EPC19 connect the negative electrode of high efficiency rectification diode D6, shunt capacitance C18 and C13 between 6 pin of EPC19 and the anode of D6, the anode of D6 as to the LM324 chip power supply-the 5V output voltage.7 pin of EPC19 connect the anode of high efficiency rectification diode D7, and D6 and D7 all adopt HER206, and the negative electrode of D7 is connected after 200R resistance R 5 and 51K resistance R 6 successively, as the sampled voltage VA of voltage sampling circuit.Being divided into the multichannel output voltage has :+5V(single-chip microcomputer, digital circuit, amplifier power supply), the power supply of-5V(LM324 integrated transporting discharging) ,+12V(relay is powered separately) and, the VC5V(communicating circuit is powered separately), the VA(voltage sample).The reference voltage that this circuit utilizes output voltage and TL431 to form compares, by photoelectrical coupler PC817 diode--and the curent change of triode removes to control the C utmost point of TOP pipe, thereby changes the PWM width, reaches the purpose of regulated output voltage.
As shown in Figure 5, the sampled voltage VA drawn from power circuit 2 is through amplifying the U-AD input that enters single-chip microcomputer for voltage detecting circuit 3, and amplifying circuit wherein is also the part of signal processing unit 4.
Further, the described intelligent motor protector of the present embodiment also comprises switching value input circuit 8, analogue quantity output circuit 9, display unit 10 and communication module 11, wherein, the output of switching value input circuit 8 connects the switching value input of CPU 5, display unit 10, analogue quantity output circuit 9 is connected with CPU 5 respectively with communication module 11, switching value input circuit 8 is for monitoring and the motor starting of user's input or the input of stop signal of relay switch state, the output of the sampled signal after analogue quantity output circuit 9 is processed for signal processing unit 4, display unit 10 adopts the mode of dynamic scan, circulation shows the sampled signal of motor three-phase current and voltage, communication module 11 adopts RS485 communication interface and Modbus-RTU communications protocol, for the digital remote communication, control and monitoring.
Switching value input circuit 8 as shown in Figure 8, comprises the photoelectrical coupler U16 that model is P181, and its C utmost point connects the PP1 port of single-chip microcomputer, for the input of switching value.For monitoring the external switch state, also can be according to customer requirement for the starting of motor, stop controlling.
As shown in Figure 2, wherein photoelectrical coupler U9 adopts P181 to analogue quantity output circuit 9, and its A utmost point input connects the PWM port of single-chip microcomputer, K utmost point input end grounding, the collector electrode of C utmost point output connecting triode, the B utmost point of E utmost point output connecting triode Q1.Three-terminal voltage-stabilizing diode U5 adopts TL431, and the negative electrode of three-terminal voltage-stabilizing diode U5 connects the C utmost point of photoelectrical coupler U9, anode and with reference to the utmost point, negative electrode and with reference to being in series with respectively 2K resistance R 59, R60 between the utmost point.The anode input of the collector electrode concatenation operation amplifier U3A of triode Q1, operational amplifier U3A adopts LM358,2 100K resistance R 31,32 of output series connection of operational amplifier U3A, after 56K resistance R 62 and 10K resistance R 26, with the anode input of operational amplifier U3B, U4A, be connected, operational amplifier U3B, U4A adopt LM358, the resistance R 29 of series connection 200K between operational amplifier U3B ground negative electrode input and output, its output output potential signal.The launching base of the negative electrode input connecting triode Q3 of operational amplifier U4A, the base stage of the output connecting triode Q3 of operational amplifier U4A, triode Q3 adopts 8050, its collector electrode connects the anode input that amplifies arithmetic unit U4B, operational amplifier U4B adopts LM358, the collector electrode of its negative electrode input connecting triode Q2, the base stage of its output connecting triode Q2, triode Q2 adopts S8550.
Described current sensor 7 adopts clamping structure, just with the three-phase firewire that is connected motor.
In a word, the foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (4)
1. an intelligent motor protector, it is characterized in that, comprise current sampling circuit (1), power circuit (2), voltage sampling circuit (3), signal processing unit (4), CPU (5) and control module (6), wherein, three live wires that current sampling circuit (1) is used current sensor (7) to connect respectively motor carry out current sample, the output of power circuit (2) connects voltage sampling circuit (3), the output of current sampling circuit (1) and voltage sampling circuit (3) is connected signal processing unit (4), signal processing unit (4) comprises accurate half-wave rectifying circuit and operational amplifier, accurate half-wave rectifying circuit is carried out rectification to sampled signal, the sampled signal of operational amplifier after to rectification amplified, the output of signal processing unit (4) connects the sample port of CPU (5), the output link control module (6) of CPU (5), control module (6) for the on off state of control relay to control the running status of motor, CPU (5) adopts the STM8S105S4T6 single-chip microcomputer.
2. intelligent motor protector according to claim 1; it is characterized in that; described power circuit (2) comprises three-terminal voltage-stabilizing diode, photoelectrical coupler, inverse-excitation type single-chip switching power supply chip; wherein; the negative electrode of three-terminal voltage-stabilizing diode is connected with the negative electrode of photoelectrical coupler; the emitter of photoelectrical coupler is connected with the control utmost point of inverse-excitation type single-chip switching power supply chip; the three-terminal voltage-stabilizing diode adopts TL431; photoelectrical coupler adopts PC817, and inverse-excitation type single-chip switching power supply chip is the TOP224YN chip.
3. intelligent motor protector according to claim 1, it is characterized in that, also comprise switching value input circuit (8), analogue quantity output circuit (9), display unit (10) and communication module (11), wherein, the output of switching value input circuit (8) connects the switching value input of CPU (5), display unit (10), analogue quantity output circuit (9) is connected with CPU (5) respectively with communication module (11), switching value input circuit (8) is for monitoring and the motor starting of user's input or the input of stop signal of relay switch state, the output of the sampled signal after analogue quantity output circuit (9) is processed for signal processing unit (4), display unit (10) adopts the mode of dynamic scan, circulation shows the sampled signal of motor three-phase current and voltage, communication module (11) adopts RS485 communication interface and Modbus-RTU communications protocol, for the digital remote communication, control and monitoring.
4. intelligent motor protector according to claim 1, is characterized in that, described current sensor (7) is clamping structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320478745 CN203367997U (en) | 2013-08-07 | 2013-08-07 | Intelligent motor protector |
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| CN 201320478745 CN203367997U (en) | 2013-08-07 | 2013-08-07 | Intelligent motor protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401217A (en) * | 2013-08-07 | 2013-11-20 | 浙江纪元电力自动化科技有限公司 | Intelligent motor protector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401217A (en) * | 2013-08-07 | 2013-11-20 | 浙江纪元电力自动化科技有限公司 | Intelligent motor protector |
| CN103401217B (en) * | 2013-08-07 | 2018-01-09 | 浙江纪元电气科技股份有限公司 | Intelligent motor protector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151223 Address after: Jiangshan City, Zhejiang province 324100 Quzhou City Road No. 198 Qing Hu Zhen Village intersection Patentee after: ZHEJIANG JIYUAN TRANSFORMER CO., LTD. Address before: 324100, Zhejiang Province, Quzhou Province, Zhejiang Province, Qing City, Qing Lake Town junction village junction No. 198 Patentee before: Zhejiang Sinoera Electric Power Automation Technology Co., Ltd. |
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| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 324100 Zhejiang province Jiangshan City Qing Hu Zhen Village intersection 198-4 junctions Patentee after: Zhejiang era electrical Polytron Technologies Inc Address before: Jiangshan City, Zhejiang province 324100 Quzhou City Road No. 198 Qing Hu Zhen Village intersection Patentee before: ZHEJIANG JIYUAN TRANSFORMER CO., LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20180807 |