CN101968984A - Method and device for controlling constant-current magnetization and demagnetization of intelligent electric permanent magnetic sucking disc - Google Patents
Method and device for controlling constant-current magnetization and demagnetization of intelligent electric permanent magnetic sucking disc Download PDFInfo
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- CN101968984A CN101968984A CN 201010259380 CN201010259380A CN101968984A CN 101968984 A CN101968984 A CN 101968984A CN 201010259380 CN201010259380 CN 201010259380 CN 201010259380 A CN201010259380 A CN 201010259380A CN 101968984 A CN101968984 A CN 101968984A
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Abstract
The invention discloses a method and a device for controlling constant-current magnetization and demagnetization of an intelligent electric permanent magnetic sucking disc and relates to magnetization and demagnetization control technology for the electric permanent magnetic sucking disc. The acquisition of various operating data and the operation of a control algorithm are completed and a corresponding pulse width modulation control signal is generated by taking an MST32 microprocessor control system and a control program thereof as cores, so that an insulated gate bipolar translator (IGBT) constant-current power conversion circuit is controlled to generate constant magnetization and demagnetization currents and constant magnetization and demagnetization magnetic fields for a magnet exciting coil of the electric permanent magnetic sucking disc. The device has extremely high stability and control accuracy, a plurality of safety protection measures and wide input power supply using range, realizes 16-grade accurate control of magnetic attraction, improves the magnetization and demagnetization efficiency of the electric permanent magnetic sucking disc by 25 to 150 percent and greatly enhances the reliability and generality of a system.
Description
Technical field
The present invention relates to the magnetization, demagnetization control technology of electric permanent-magnet suction disc, be specially intelligent electric permanent magnetic chuck constant current magnetizing and demagnetizing controller.
Background technology
Electric permanent-magnet suction disc is the renewal product of traditional electrical magnetic-disc, and its functional characteristics is as long as through after magnetizing, just can keep magnetic attraction for a long time, and the time spent can not removed magnetic attraction by demagnetization.Only magnetize or the demagnetization process in just need energising, operating state need not switched at ordinary times, so both can reduce coil heating and cause workpiece deformation, can save a large amount of electric energy again, can also regulate the size of its magnetic attraction by the control electric current that magnetizes, avoided pulling, being out of shape of workpiece, obtained widely applying at mechanical industry, hoisting equipment, automatic production line.Electrically permanent magnet cupula magnetizing and demagnetizing controller is one of core component of electric permanent-magnet suction disc indispensability, and its performance quality directly affects the overall performance of electric permanent-magnet suction disc and safe in utilization.There are the following problems for controllable silicon phase shifting control technology that present home and abroad is commonly used and power tube pulse-width modulation voltage stabilizing technique:
1, the magnetization energy of controller output and the loop reactance of electric permanent-magnet suction disc magnet exciting coil are inversely proportional to, very easily cause, reactance low obtain excessive magnetization energy heating burnout, larger area electric permanent-magnet suction disc because of series excitation coil number more, reactance higher acquisition less magnetization energy underexcitation less because of the series excitation coil number than the electric permanent-magnet suction disc of small size;
2, the supply voltage of the magnetic attraction of electric permanent-magnet suction disc when magnetizing, the fluctuation of ambient temperature change greatly, can't accurately control the magnetic attraction of electric permanent-magnet suction disc;
3, controllable silicon is that the current over-zero type turn-offs device naturally, need wait until that when short trouble appears in the electric permanent-magnet suction disc magnet exciting coil output current could turn-off when being zero, can't implement quick protection; Power tube pulse-width modulation voltage stabilizing technique is output as constant-voltage characteristic, when variation of ambient temperature was big, the fluctuation of output exciting current was bigger, when insulation fault appears in the electric permanent-magnet suction disc magnet exciting coil, output current will sharply increase, and very easily cause magnet exciting coil to burn because of overheated;
4, when supply voltage is too high, carry out magnetization, demagnetization operations and cause easily that the electric permanent-magnet suction disc magnet exciting coil is overheated to be burnt, cross when low when supply voltage, carry out the magnetization, demagnetization operation and easily cause electric permanent-magnet suction disc maybe can't demagnetize because of underexcitation magnetic force deficiency.
Summary of the invention
Problem at above-mentioned prior art exists the invention provides the constant current of a kind of intelligent electric permanent magnetic chuck and fills the demagnetization control method.
Technical solution of the present invention is: carry out field signal, shift signal, temperature signal and current signals, control and computing with the MST32 microprocessor control system, and the pulse-width modulation control signal that the MST32 microprocessor control system produces is used to control IGBT constant current power conversion circuit the electric permanent-magnet suction disc magnet exciting coil is produced constant fill, move back electric current and constant magnetization, demagnetization magnetic field.
The present invention has following characteristics:
1, constant current is carried out in electric permanent-magnet suction disc magnet exciting coil loop fills, demagnetization control, make it fill demagnetization voltage and electric permanent-magnet suction disc magnet exciting coil resistance in circuit direct ratio, electric current remains invariable, so just can make electric permanent-magnet suction disc magnet exciting coil loop is filled, the energy of demagnetization is directly proportional with the electric permanent-magnet suction disc area, and (the electric permanent-magnet suction disc area is big more, the number of energized coils of its magnet exciting coil loop series connection is many more, the magnet exciting coil resistance in circuit is big more), when ambient temperature causes that the electromagnetic parameter in electric permanent-magnet suction disc magnet exciting coil loop changes, fill, it is constant that demagnetization current keeps, fill thereby make, it is constant that demagnetizing field intensity keeps, when the user designs electric permanent-magnet suction disc magnet exciting coil loop, only magnet exciting coil loop resistance≤(1.38* input supply voltage-6)/rated current be need design simply, and the calculating and the l-G simulation test of complexity need not the nonlinear inductance component of energized circuit to be carried out again;
2, under identical input voltage condition, the highest output average voltage is 1 times of controllable silicon phase shifting control technology, and the magnetization, demagnetization excitation area that can increase electric permanent-magnet suction disc improves magnetization, demagnetization efficient 25%-150% more than 50%;
3, have accurate magnetic force controlled function, but provide 16 grades of adjustment magnetic force that can satisfy various magnetic force application requirements to select control;
4, when serious short trouble takes place in the electric permanent-magnet suction disc magnet exciting coil, have a protective value that response speed is better than the quick shutoff output current of 5uS; When the partial short-circuit fault appears in the electric permanent-magnet suction disc magnet exciting coil, reduce exciting voltage automatically, it is invariable to keep output current; When insulation fault appears in the electric permanent-magnet suction disc magnet exciting coil, stop the magnetization, demagnetization operation automatically;
5, provide can be in input ac power 150VAC-440VAC/45Hz-400Hz (or DC power supply 160VDC-600VDC) scope reliably working and have the electric permanent-magnet suction disc control device of stable output.
Another purpose of the present invention is to provide a kind of feasible device for above method:
The present invention includes power supply, MST32 microprocessor control system, described power supply is divided into two-way behind rectification, startup and filter circuit, one the tunnel provides power supply for power converting circuit, another road is connected with IGBT constant current power conversion circuit, an output of described IGBT constant current power conversion circuit is connected with channel switching circuit through current detection circuit, and described channel switching circuit is provided with the constant current output that directly links to each other with electric permanent-magnet suction disc; Described MST32 microprocessor control system is connected with protective circuit, digital demonstration and drive circuit, button inputting circuits, PLC control interface circuit, RS485 communication interface circuit, sensor signal translation circuit with current detection circuit, channel switching circuit, IGBT driving respectively.
The present invention has the high and good advantage of control precision of stability; has multiple safety precautions; the broad input power supply scope of application is arranged; 16 grades of accurately controls of magnetic attraction have been realized; under identical input voltage condition, the highest output average voltage is 1 times of controllable silicon phase shifting control technology, can increase the excitation area more than 50%; improve magnetization, demagnetization efficient 25%-150%, improved the versatility and the reliability of system widely.
Power converting circuit is used to provide the multiple isolation voltage of the required steady operation of system, power converting circuit comprises integrated circuit U7 and the power field effect pipe Q7 of withstand voltage 〉=800V of connecting with the drain electrode of described integrated circuit U7, the anti-sharp voltage of conversion of U7 is risen to more than the 1200V volt by 700V, thereby the realization power converting circuit can be worked in input voltage 160V-600V scope safely and reliably, and resistance R 14, R21, R32, D17, D21 provide dynamic bias voltage for Q7.
Description of drawings
Fig. 1 is a principle schematic of the present invention.
Fig. 2 is MST32 microprocessor control system principle assumption diagram among the present invention.
Fig. 3 is power converting circuit and constant current power conversion system principle assumption diagram among the present invention.
Among the figure: 1, LED is digital shows and drive circuit; 2, button inputting circuits; 3, relay drive circuit; 4, CPU and sensor electrical source circuit; 5, PLC control interface circuit; 6, MST32 microcontroller circuit; 7, sensor signal conditioning circuit; 8, magnetization, demagnetization running status feedback circuit; 9, RS485 datel circuit; 10, three-phase bridge rectification, startup, filtering and surge restraint circuit; 11, constant current power conversion circuit; 12, current detection circuit; 13, power converting circuit; 14, IGBT drives and protective circuit; 15, channel switching circuit.
Embodiment
As shown in Figure 1, the present invention includes power supply, MST32 microprocessor control system, interchange or DC power supply are divided into two-way after rectification, startup and filter circuit are handled, the one tunnel for power converting circuit provides power supply, and another road is connected with IGBT constant current power conversion circuit.An output of IGBT constant current power conversion circuit is connected with channel switching circuit through current detection circuit, and channel switching circuit is provided with the constant current output that directly links to each other with electric permanent-magnet suction disc; The MST32 microprocessor control system is connected with protective circuit, digital demonstration and drive circuit, button inputting circuits, PLC control interface circuit, RS485 communication interface circuit, sensor signal translation circuit with current detection circuit, channel switching circuit, IGBT driving respectively.
As shown in Figure 2, the MST32 microprocessor control system comprises: MST32 microcontroller circuit 13, the digital demonstration of LED and drive circuit 1, button inputting circuits 2, relay drive circuit 3, PLC control interface circuit 5, RS485 datel circuit 9, CPU and sensor electrical source circuit 4, magnetic field sensor, displacement transducer, temperature sensor, current sensor signal modulate circuit 7 and magnetization, demagnetization running status feedback circuit 8.
Integrated circuit U1, U3 convert the serial signal that the MST32 microprocessor sends to the digital scanning shows signal, deliver to digital display driving integrated circuit U2, U4, drive group of four figures pipe DS1, system running state indication light-emitting diode D4-D6; Button S1-S6 is used for the setting of man-machine parameter and the input of control command; Integrated circuit U7, U8 accept the signal of MST32 single-chip microcomputer, are used to drive magnetic latching relay, starting relay, the running status feedback relay that passage switches; Integrated circuit U18, U11 are respectively probe power translation circuit and cpu power circuit; In the PLC control interface circuit 5, integrated circuit U5, U6, U9, U10, U12, U14, U15 are that PLC input interface light is isolated integrated circuit, are respectively the instruction of magnetizing, demagnetization instruction, unlocking signal, 16 grades of magnetic attraction selections of 8421 complement codes signal; Integrated circuit U13 is the MST32 microprocessor, and integrated circuit U16 is the FRAM memory; Resistance R 36-R44, R47, R48, R49, R51, R52, R53, R55-R60, capacitor C 22-C26, C28, C29, C30, C34-C36 form the sensor signal translation circuit, are used for converting sensor output signal to signal that MST32 microprocessor A/D can detect; K switch 1-K3 is a running status feedback relay; Integrated circuit U17 is a RS485 data communication integrated circuit, is used to realize teledata control.
With the MST32 microprocessor is that core is finished: the data acquisition of (1) field signal, shift signal, temperature signal, current signal; (2) carry out the magnetization, demagnetization control algolithm according to user instruction, produce pulse-width modulation control signal and passage switch-over control signal; (3) executor's machine operation and data-storing; (4) carry out PLC control command and data communication; (5) carry out error protection and warning function.
The MST32 microprocessor control system can produce optimum magnetization, demagnetization control signal according to user's setting data.
As shown in Figure 3, three-phase bridge rectification, startup, filtering and surge restraint circuit 10: form the whole circuit of three-phase bridge by the diode D1-D6 that is connected to power supply, resistance R 6 is formed start-up circuit with K switch 1, K2, and RV3-RV5 forms surge restraint circuit 10; Form filter circuit by capacitor C 1-C4, C8-C11, resistance R 7, R8, R10, R11; The constant current translation circuit of forming by the Q1-Q4IGBT power tube 11; The current detection circuit of forming by integrated circuit U2 and U3 etc. 12; K switch 1, K2 magnetic latching relay etc. are formed channel switching circuit 15; Integrated circuit U4, U5, U8, U11, RT1 etc. form IGBT and drive and protective circuit, wherein RT1 is used for overtemperature prote, the VCE saturation voltage that diode D9, D16, D23, D25, capacitor C 16-C18, C27-C29, C39-C41, C49-C51, resistance R 17, R18, R27, R28, R38, R39, R43, R44 are used for IGBT detects, and resistance R 23, R30, R41, R46 are IGBT control utmost point driving resistor; T1; Q7; U7; U6; U10 etc. form power converting circuit 13; wherein Q7 is used to promote the operating voltage of integrated circuit U7; resistance R 14; R21; R32; diode D17; D21 provides dynamic bias voltage for Q7; resistance R 15; R22; R25; R31; R35; diode D22 provides the protection biasing for U7; integrated circuit U10 is a voltage reference; integrated circuit U6 is the linear feedback photoelectrical coupler; D8; D11; R24 is the anti-due to voltage spikes protection that swashs; diode D7; D10; D13; D14; D15; D18; D19 is the rectification fast recovery diode; capacitor C 14; C19; C23; C26; C30; C31; C35; C36 is a filter capacitor; resistance R 16; R26; R37; diode D12; D20; D24; capacitor C 15; C22; C24; C34; C38; C47 is respectively applied for and produces integrated circuit U4; U5; the virtual positive-negative power of U8 and U11, integrated circuit U9 are the 12V integrated regulator.
Functional characteristics:
(1) use magnetic latching relay to substitute the common electrical magnetic relay, the passage that is applied to the electrically permanent magnet cupula magnetizing and demagnetizing coil windings switches, make contact capacity be increased to 80A/400VAC by original maximum 25A/250VAC, and volume reduces over half, the MST32 microprocessor control system is only being closed all IGBT power tubes of major loop, and when recording output current and be zero, just send the passage switching command, make the contact galvanic corrosion of magnetic latching relay drop to minimum;
(2) when operation is magnetized in execution, U11 accepts the order of MST32 microprocessor control system, drive IGBT power tube Q3 conducting, the MST32 microprocessor control system carries out analytical calculation by the current detection signal value to U2 and U3 simultaneously, just often U4 is sent pulse-width signal when confirming insulation, U4 driving IGBT power tube Q2 begins that the electric permanent-magnet suction disc magnet exciting coil is carried out little electric current and magnetizes, after this, the MST32 microprocessor control system will constantly compare the output current detected signal value of U2 and U3 and the current value that magnetizes of setting, the electric permanent-magnet suction disc magnet exciting coil is carried out constant current magnetize by specific control algolithm control Q2; When carrying out the demagnetization operation, U5 accepts the order of MST32 microprocessor control system, drive IGBT power tube Q1 conducting, the MST32 microprocessor control system carries out analytical calculation by the current detection signal value to U2 and U3 simultaneously, just often U8 is sent pulse-width signal when confirming insulation, U8 drives IGBT power tube Q4 to begin the electric permanent-magnet suction disc magnet exciting coil is carried out little electric current demagnetization, after this, the MST32 microprocessor control system will constantly compare the output current detected signal value of U2 and U3 and the current value that magnetizes of setting, by specific control algolithm control Q4 the electric permanent-magnet suction disc magnet exciting coil is carried out the constant current demagnetization;
(3) if grasp electric permanent-magnet suction disc magnet exciting coil generation partial short-circuit fault during the course filling (moving back) magnetic, cause the instantaneous increase of output current, the MST32 microprocessor control system will shorten Q2 (Q4) ON time automatically, reduce to fill (moving back) magnetic energy, make output current keep constant;
(4) serious short trouble takes place in the electric permanent-magnet suction disc magnet exciting coil if grasp during the course in magnetization, demagnetization, cause output current instantaneous excessive, when its value surpasses when setting flow valuve, the MST32 microprocessor control system will turn-off all IGBT power tubes and send alarm signal in 5uS;
(5) U4, U5, U8, U11 detect comparison to the VCE saturation voltage of the IGBT power tube Q2 of its driving, Q1, Q4, Q3 respectively, when the generation over current fault makes the VCE saturation voltage of IGBT power tube surpass the design safety value, it will turn-off the concurrent interrupt signal that is out of order of the IGBT power tube that is driven immediately and give the MST32 microprocessor control system, and the MST32 microprocessor control system will turn-off all IGBT power tubes and send alarm signal.
The present invention is that core can realize following purpose with MST32 microprocessor and system controlling software thereof:
1, by with the MST32 microprocessor control system in sensor signal conditioning circuit 7 be connected the data acquisition that realizes field signal, shift signal, temperature signal, current signal;
2, carry out the magnetization, demagnetization control algolithm, produce pulse-width signal and passage switching command according to user instruction, by with Fig. 3 in IGBT drive and being connected of protective circuit 14, realization is to the constant current pulse width control and the fault feedback function of IGBT power tube, by with being connected of Fig. 2 repeat circuit drive circuit 3, realize the passage handoff functionality;
3, by with Fig. 2 in LED digital show with drive circuit 1 and button inputting circuits 2 be connected executor's machine operation and data-storing function;
4, by with Fig. 2 in being connected of PLC control interface circuit 5, magnetization, demagnetization running status feedback circuit 8, RS485 datel circuit 9, carry out PLC control and data communication function;
5, by with Fig. 2 among sensor signal conditioning circuit 7, magnetization, demagnetization running status feedback circuit 8 and Fig. 3 IGBT drive with protective circuit 14 be connected execution error protection and warning function.
Intelligent electric permanent magnetic chuck constant current magnetizing and demagnetizing controller of the present invention is through after testing, and every performance index all are better than prior art.Significantly improve (reaching as high as more than 1 times) as magnetization, demagnetization efficiency to electric permanent-magnet suction disc; But the accurate magnetic force with 16 grades of adjustment that prior art can't realize is selected control; Have the power supply input range of extremely wide (various countries' civil power is general), and have high output stability; Have multiple safety precautions, get reliable protection (preventing that effectively fault from further enlarging and device damage) in the time of guaranteeing fault such as the electric permanent-magnet suction disc magnet exciting coil insulate, short circuit; Have data communication function, control centre can connect 128 controller collaborative works of as many as by two core twisted-pair cables, forms large-scale, complicated electric permanent-magnet suction disc application system (transmitting and processing as workpiece on the streamline).The present invention has improved filling demagnetization efficiency, magnetic force control precision, versatility, reliability, having simplified the electrical design of electric permanent-magnet suction disc of electric permanent-magnet suction disc, and applying of electric permanent-magnet suction disc had positive effect.
Claims (3)
1. the demagnetization control method is filled in the constant current of intelligent electric permanent magnetic chuck, it is characterized in that carrying out field signal, shift signal, temperature signal and current signals, control and computing, and the pulse-width modulation control signal that the MST32 microprocessor control system produces is used to control IGBT constant current power conversion circuit the electric permanent-magnet suction disc magnet exciting coil is produced constant fill, move back electric current and constant magnetization, demagnetization magnetic field with the MST32 microprocessor control system.
2. the demagnetization control device is filled in the constant current of intelligent electric permanent magnetic chuck according to claim 1, it is characterized in that comprising power supply, MST32 microprocessor control system, described power supply is divided into two-way behind rectification, startup and filter circuit, one the tunnel provides power supply for power converting circuit, another road is connected with IGBT constant current power conversion circuit, an output of described IGBT constant current power conversion circuit is connected with channel switching circuit through current detection circuit, and described channel switching circuit is provided with the constant current output that directly links to each other with electric permanent-magnet suction disc; Described MST32 microprocessor control system is connected with protective circuit, digital demonstration and drive circuit, button inputting circuits, PLC control interface circuit, RS485 communication interface circuit, sensor signal translation circuit with current detection circuit, channel switching circuit, IGBT driving respectively.
3. the demagnetization control device is filled in constant current according to the described intelligent electric permanent magnetic chuck of claim 2, it is characterized in that described power converting circuit comprises integrated circuit U7 and the power field effect pipe Q7 of withstand voltage 〉=800V of connecting with the drain electrode of described integrated circuit U7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010259380 CN101968984A (en) | 2010-08-17 | 2010-08-17 | Method and device for controlling constant-current magnetization and demagnetization of intelligent electric permanent magnetic sucking disc |
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| CN 201010259380 CN101968984A (en) | 2010-08-17 | 2010-08-17 | Method and device for controlling constant-current magnetization and demagnetization of intelligent electric permanent magnetic sucking disc |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104112563A (en) * | 2014-08-13 | 2014-10-22 | 爱德森（厦门）电子有限公司 | Design and application method of alternating-current constant magnetic source |
| CN104485197B (en) * | 2014-12-17 | 2016-06-29 | 沈阳隆基电磁科技股份有限公司 | A kind of Constant charge soil demagnetizer of frequency-adjustable |
| CN104330988B (en) * | 2014-10-12 | 2017-07-28 | 佛山市顺德区盛锵德磁科技有限公司 | A kind of electric permanent-magnet suction disc control device quickly changed the mold |
| CN114071920A (en) * | 2021-11-16 | 2022-02-18 | 南通茂业电子科技有限公司 | Electric permanent magnetic chuck controller assembly with demagnetization early warning prompt |
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| CN2456881Y (en) * | 2000-12-27 | 2001-10-31 | 天津市科信新技术开发应用公司 | Petal shape electrophorectic magnetic sucking disc |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104330988B (en) * | 2014-10-12 | 2017-07-28 | 佛山市顺德区盛锵德磁科技有限公司 | A kind of electric permanent-magnet suction disc control device quickly changed the mold |
| CN104485197B (en) * | 2014-12-17 | 2016-06-29 | 沈阳隆基电磁科技股份有限公司 | A kind of Constant charge soil demagnetizer of frequency-adjustable |
| CN114071920A (en) * | 2021-11-16 | 2022-02-18 | 南通茂业电子科技有限公司 | Electric permanent magnetic chuck controller assembly with demagnetization early warning prompt |
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Open date: 20110209 |