CN102074932A - Method and system for monitoring motor load - Google Patents
Method and system for monitoring motor load Download PDFInfo
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- CN102074932A CN102074932A CN2011100020302A CN201110002030A CN102074932A CN 102074932 A CN102074932 A CN 102074932A CN 2011100020302 A CN2011100020302 A CN 2011100020302A CN 201110002030 A CN201110002030 A CN 201110002030A CN 102074932 A CN102074932 A CN 102074932A
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Abstract
The invention relates to a method and system for monitoring motor load, wherein the load monitoring system comprises a current monitoring device, a relay protection device, a breaker circuit of the motor and a current regulator, wherein an input end of the current monitoring device is connected with the breaker circuit through electric cables. The monitoring system further comprises: an I/O (input/output) interface, a programmable logic controller (PLC) and a computer/display screen/audio beeper of a central control room, wherein the computer of the central control room is connected with the PLC through a high-speed Ethernet communication network; the PLC is connected with the I/O interface and the input end of the current monitoring device through industrial field-bus; and the I/O interface is also connected with a controlled terminal of the breaker circuit and a controlled terminal of the current regulator through communication cables. Within the time limit of traditional overload relay-protection, by using the load monitoring system provided by the invention, the motor load can be monitored in real time, alarm signals can be reasonably transferred to the central control room in time, and operational instructions for reasonable load can be automatically given, thereby avoiding overload running of the motor and eliminating accidents of stop production due to the overload.
Description
Technical field
The present invention relates to a kind of electromechanical controlling device, more particularly, the present invention relates to a kind of electromechanical controlling device of regulating and control industrial motor load.
Background technology
The smelting chemical industry extensively is equipped with large power high voltage motor in the field, and its safe handling is most important for enterprise security production and normal operation, for this reason, adopts the high pressure relaying protection system to guarantee that high-voltage motor carries out efficient normal operation usually.
The conventional high-tension relaying protection system; its circuit comprises monolithic computer MC; its control principle is: testing circuit gather the motor operation voltage the various signals of electric current; send the numerical value output order to the motor power supply circuits after circuit analysis such as MC is calculated in relaying protection system and control, but its load defencive function is mainly current quick and overload protection.Current quick: i.e. protection when big electric current such as short circuit appear in circuit, the definite value that transfinites is the zero propagation open circuit then; Overload protection: overload protection time limit (being the T2 in the technical program), and the limit value of about 1.3 times of rated current promptly are set in relaying protection system; Reach the protection time limit if electric current continues to surpass limit value, the high pressure protective relaying device just sends the numerical value output order, implements the overload stoppage protection to power supply circuits.Since to escape the electric motor starting overcurrent period, disturb motor normally to start to avoid control command; the relay overload protection time limit must be set to the start-up time greater than motor; so, traditional overload protection method can only be a kind of stoppage protection measure of motor overload when serious.
The overload protection (or abbreviating the relay overload protection as) that is provided with in the tradition microcomputer type high pressure relaying protection system; can not indicate the overcurrent trend that rated current changes to the limit value electric current; also can't get involved and regulate automatically the load of high-voltage motor in advance; thereby cause the operator of Central Control Room also can't adjust motor load in good time; cause overload (discontinuous pulses formula) operation of motor long period; but the overload protection time limit that this overload pulse duration is set less than legacy system again; do not reach the condition of relay overload protection action; yet this section overload operating time is oversize as continuing; the electric machine temperature rise accumulation can cause electrical machine insulation to damage; even cause motor-driven reductor to damage because of overload, have a strong impact on and produce the overall situation.
Present domestic tens the slag micropowder production lines that have, the high-voltage motor of liquid resistance (being commonly called as water resistance) speed governing is all adopted in its grinding machine main transmission, and control system all adopts traditional high pressure relaying protection system.Production practices show: the grinding machine motor of above-mentioned conventional high-tension relaying protection system regulation and control often causes faults such as insulation damages because of overload; wherein within the example 1 year because of transshipping common generation insulation damages and consequent malfunction four times; cause and stopped production 120 hours; 2,160,000 yuan of direct economic losses have had a strong impact on and have restricted the survival and development of enterprise.
Summary of the invention
Above-mentioned shortcoming at prior art; the objective of the invention is to provide a kind of motor load monitoring method and motor load supervisory control system; it has following advantage: can be within traditional relay overload protection time limit; motor load is monitored in real time; can be timely and reasonably send alarm signal and send the operational order of reasonable load automatically to Central Control Room; thereby avoid the motor overload operation, the stopping production accident of stopping to transship takes place.
For this reason, one of technical solution of the present invention is a kind of motor load monitoring method, and it adopts monitor monitoring motor and rated current Id thereof, and it comprises the steps:
A: initialization timing;
B: press real-time current I s, the accumulative total tg of tg cycle monitoring motor, and judge whether the overload outage time limit T2 of ∑ tg≤settings, as be judged as and deny, turn to steps A, as to be judged as be to turn to step C;
C: judge whether real-time current Is＞Id,, turn to step D, in this way, turn to step G as not;
D: judge whether real-time current Is＞X%Id, as not, turn to step e, in this way, turn to step F, described X value is 93-97;
E: zero propagation sends to add to produce and adds the load instruction and forbid that the display screen color reports to the police, turns to then step B;
F: zero propagation is forbidden adding producing and is added the load instruction, turn to step B then;
G: the tg of electric current correspondence that zero propagation enforcement display screen color is reported to the police and accumulative total exceeds the quata turns to step H to T1;
H: calculate, judge whether T1/T2＞Y%, in this way, turn to step J, as not turning to step I, described Y value is 18-22;
I: zero propagation is forbidden underproduction off-load lotus/reduction current-order, is forbidden audible alarm, turns to step B then;
J: zero propagation sends underproduction off-load lotus/reduction current-order, audible alarm, turns to step B then.
Motor load monitoring method of the present invention, adopt monitor period ground that current of electric is monitored in real time, and creatively adopt the current overload degree value X% of meticulous setting, overload time continues percentage parameter TI/T2 and limits ratio Y%, the operating mode of motor load acting is carried out the fine monitoring regulation and control, thereby can be within traditional relay overload protection time limit, more accurate, in time, rationally, automatically send operational order, accent increases/adjusts and reduce the load behavior of motor and even its front and back corollary equipment, realize reasonable underproduction load shedding, and can send alarm signal to Central Control Room timely and reasonably, thereby effectively avoid the motor overload operation, the stopping production accident of stopping substantially to transship takes place; Because motor load monitoring method of the present invention can be guaranteed motor and even front and back corollary equipment and move below relaying protection overload limit; and can in running space below the limit is transshipped in relaying protection, transfer the load behavior that increases/adjust and reduce motor and front and back corollary equipment thereof, thereby significantly improve accuracy, reasonability, promptness and the automaticity of monitoring.
The present invention monitors method can be in conjunction with the DCS Distributed Control System of utilizing enterprise generally to equip (or saying dcs); on the display screen picture of Central Control Room operator station, draw out the trend curve of three different colors: the real-time current I s trend curve of high-voltage motor, rated current Id straight line, the overload protection overload water holdup TI/T2 trend curve in the time limit, for middle control operator monitoring and the manual intervention regulation and control intuitively at any time of non-electric specialty.
The present invention has monitored method since relevant enterprise long term trial run, breeze Vertical Mill equipment master motor and need the overload phenomenon of equipment to be effectively controlled, and long-term operation is stable, the overload of generation stopping production fault again, and year economic benefit is more than 2,000,000 yuan.Compare therewith, do not make the domestic slag powders production line of above-mentioned transformation the same period, occur faults such as Vertical Mill equipment main driving motor in succession, even damage reductor, motor returns the maintenance of motor manufactory, has had a strong impact on normally carrying out that enterprise produces.
By above-mentioned advantage as seen, the present invention monitors method, all has the prospect that enforcement is applied for similar devices, similar applications, and more the grinding machine main transmission control of industry transformation and construction slag micropowder production line provides a convenient and practical monitoring scheme.
For the multiple passage of manual intervention regulation and control further is provided, optimize ease for operation, flexibility, monitoring method of the present invention comprises following concrete improvement:
Described step e is implemented as step by step: formerly step e 1: zero propagation forbids that the display screen color reports to the police, turns to then step e 2, intermediate steps E2: monitoring has not that the people adds the load instruction for adding to produce, as is judged as and is, turns to step B, as to be judged as deny to turn to step e 3; In back step e 3: zero propagation sends to add to produce and adds the load instruction, turns to step B then.
Described step J is implemented as step by step: step J1 formerly: zero propagation is implemented audible alarm, turned to step J2, intermediate steps J2 then: monitoring has not that the people is the instruction of underproduction off-load lotus, as is judged as and is, turns to step B, as is judged as not, turns to step J3; At back step J3: zero propagation sends underproduction off-load lotus/reduction current-order, turns to step B then.
For real-time, the accent of further optimizing the motor monitoring increases reasonability, accuracy, the timeliness of adjusting and reducing, monitoring method of the present invention comprises following concrete improvement:
Described X value is 95; Described T2 value is 15-120 second.Described Y value is 20.
Described T2 value is 30 seconds, and described tg value is 0.1-1.0 second.
For increasing the frequent degree that the inventive method is called, compensate the detection neutral of T2 in the cycle, thereby the real-time, the accent that further promote the motor monitoring increase reasonability, accuracy, the timeliness of adjusting and reducing, monitoring method of the present invention comprises following concrete improvement:
Described monitor is pressed the tz cycle, repeatedly begins to carry out described monitoring step from steps A, and tz is the 1/30-1/10 of T2.
Correspondingly; another technical solution of the present invention is a kind of employing motor load supervisory control system of motor load monitoring method as mentioned above; it comprises current monitoring device; the protective relaying device of motor and breaker circuit thereof; the current regulator of control current of electric; the input of described current monitoring device is connected by cable with described breaker circuit; and described supervisory control system also comprises: the I/O interface; programmable logic controller (PLC) PLC; computer/the display screen of Central Control Room/voice guard; described Central Control Room computer is connected by high speed ether communication network with PLC; described PLC and I/O interface; the output of current monitoring device is connected by industrial field bus, described I/O interface also with the controlled end of described breaker circuit; the controlled end of current regulator is connected by the communications cable.
Supervisory control system of the present invention can be on the basis of original high pressure relaying protection system and actuator, in conjunction with the DCS Distributed Control System of utilizing smelting enterprise generally all to equip, set up the I/O interface, display screen/voice guard, can on former DCS Distributed Control System, move motor load monitoring method of the present invention very simply and easily, thereby can be within traditional relay overload protection time limit, motor overload is carried out highly real-time monitoring, automatically send the operational order of reasonable load, and can send alarm signal to Central Control Room timely and reasonably, on the display screen picture of Central Control Room operator station, draw out the trend curve of three different colors: the real-time current I s trend curve of high-voltage motor, rated current Id straight line, and the overload water holdup TI/T2 trend curve in the overload protection time limit, middle control operator monitoring and manual intervention regulation and control at any time intuitively for non-electric specialty, thereby can effectively avoid the motor overload operation, the stopping production accident of stopping to transship takes place, and can in overload wide running space below the limit, transfer the load behavior that increases/adjust and reduce motor and front and back corollary equipment thereof, significantly improve the accuracy of monitoring, reasonability, promptness and automaticity; And supervisory control system of the present invention makes full use of the original generally DCS Distributed Control System of equipment of smelting enterprise, and is simple in structure, implement to have wide promotion prospect easily.
Monitor the order of the dominance of processing, conformability, signal instruction transmission, reasonability, the validity that instruction is carried out separately for further bringing into play protective relaying device and DCS Distributed Control System, supervisory control system of the present invention comprises following concrete improvement:
Described protective relaying device comprises single-chip microcomputer, signal input port, the instruction outlet of control motor overload outage time limit T2 and rated current Id; the controlled end of described breaker circuit also is connected with described instruction outlet, and described current monitoring device output also is connected with described signal input port.
For further being increased in the adaptability that apply in the smelting field, supervisory control system of the present invention comprises following concrete improvement:
Described motor is for driving the high-voltage motor of breeze Vertical Mill; Described current regulator comprises the liquid resistance that is connected in the described rotor loop, the traveling electrode of continuous regulator solution volume resistance and the adjusting device of resistance, and described adjusting device comprises contactor and is subjected to the driver of the driving traveling electrode of its control.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
The main schematic diagram of the breeze Vertical Mill that Fig. 1 is monitored for motor load supervisory control system embodiment of the present invention.
Fig. 2 for the A-A of Fig. 1 to the schematic diagram of analysing and observe.
Fig. 3 is the circuit block diagram of motor load supervisory control system embodiment of the present invention.
Fig. 4,5 is respectively the present invention and transships the block diagram of monitoring method embodiment 1,2.
Embodiment
Breeze Vertical Mill embodiment:
As Fig. 1,2, shown in be respectively the main schematic diagram of the breeze Vertical Mill that motor load supervisory control system embodiment of the present invention monitored and A-A to cross-sectional schematic.Vertical Mill comprises the motor 10 of main transmission, reductor 11, mill 12, grinding roller 13, the hydraulic pressure draw-bar 14 of grinding roller.During Vertical Mill work, raw materials of slag KZ feeds mill 12 centers directly over Vertical Mill, main driving motor 10 drives mill 12 rotations (shown in mill 12 peripheral arrows) by reductor 11, followed mill 12 driven rotations (shown in corresponding arrow on the grinding roller 13) by the grinding roller 13 that hydraulic pressure draw-bar 14 is pressed abd fixed on the mill 12, raw materials of slag moves between grinding roller 13 and the mill 12 by grinding because of action of centrifugal force, and qualified products are finished product by the blower fan vacuum collecting.
In the smelting process of smelter, often there is the slag accessory substance, and in the smelting process of iron and steel metallurgy enterprise, the slag accessory substance that is inevitable, its discharge rate accounts for 30% of iron output.Be that the slag powders of raw material production can substitute partly that cement raw material is used to form concrete with the slag, and can improve concrete service behaviour and physical property, if can significantly improve concrete durability.In recent years, along with the development of Vertical Mill technology, domestic have tens slag micropowder production lines, all adopts large-scale Vertical Mill master as wanting production equipment, makes slag milling efficient be greatly improved; Because grinding gets carefullyyer, the slag powders performance is more given full play to, thereby is able to tremendous development as product independently, and slag also becomes well sold and in short supply resource of today from original solid waste.
The overload protection (or abbreviating the relay overload protection as) that is provided with in the tradition microcomputer type high pressure relaying protection system; can not indicate the overcurrent trend that rated current changes to the limit value electric current; also can't get involved and regulate automatically the load of high-voltage motor in advance; thereby cause the operator of Central Control Room also can't adjust motor load in good time; cause overload (discontinuous pulses formula) operation of Vertical Mill motor long period; but the overload protection time limit that this overload pulse duration is set less than legacy system again; do not reach the condition of relay overload protection action; yet this section overload operating time is oversize as continuing; the accumulation of Vertical Mill electric machine temperature rise can cause electrical machine insulation to damage; even cause motor-driven reductor to damage because of overload, have a strong impact on and produce the overall situation.
Motor load supervisory control system embodiment of the present invention adopts high pressure relaying protection system and water resistance speed governing etc. to be controlled for the high-voltage motor 10 of above-mentioned breeze Vertical Mill, specifically referring to Fig. 3.The motor load supervisory control system of the present invention that combines the DCS Distributed Control System can also be controlled whole links that whole production line is collected, delivered to finished product from slag stacking, conveying, oven dry, grinding, controls fineness of grinding, output etc. comprising hydraulic pressure draw-bar 14 dynamics of control Vertical Mill.
Motor load supervisory control system embodiment of the present invention:
As Fig. 3, be depicted as the circuit block diagram of motor load supervisory control system embodiment of the present invention.This motor load supervisory control system embodiment comprises current monitoring device 20, the protective relaying device 30 and the breaker circuit 31 thereof of control motor power, the current regulator of control current of electric, the input of described current monitoring device 20 and described breaker circuit 31 are connected by cable, and described supervisory control system also comprises: I/O interface 21, PLC programmable logic controller (PLC) 22, computer 23/ display screen 24/ voice guard of Central Control Room (not giving detailed showing), described Central Control Room computer is connected by high speed ether communication network 25 with PLC 22, described PLC22 and I/O interface 21, the output of current monitoring device 20 is connected by industrial field bus 26, described I/O interface 21 to external port also with described breaker circuit 31 controlled ends, the controlled end of current regulator is connected by the communications cable; Wherein, all belong to monitor in the motor overload method for supervising of the present invention in the frame of broken lines.
Described protective relaying device 30 comprises single-chip microcomputer (do not give and illustrating), signal input port 300, the instruction outlet 301 of control motor overload outage time limit T2 and rated current Id; described breaker circuit 31 controlled ends also are connected with described instruction outlet 301, and described current monitoring device 20 outputs also are connected with described signal input port 300.
Described motor 10 is for driving the high-voltage motor of breeze Vertical Mill; Described current regulator comprises the liquid resistance 32 that is connected in described motor 10 rotor loops (internal structure is not given detailed showing) and the traveling electrode (do not give and illustrating) of continuous regulator solution volume resistance 32 and the adjusting device 33 of resistance, and described adjusting device 33 comprises contactor, controlled by contactor drives the driver (internal structure is not all given and being illustrated) of traveling electrode.
When motor 10 duration of overload do not have overstepping the time limit T2 or duration of overload overstepping the time limit T2 but real-time current I s when not surpassing 1.3 times of rated current Id, then main monitor, I/O interface in by dashed box instructs adjusting device 33,32 pairs of motors 10 of liquid resistance and even front and back operation relevant device to be coordinated to control; As motor 10 duration of overload overstepping the time limit T2, then cut off the power supply of motor 10 and front and back operation relevant device by protective relaying device 30 instruction breaker circuits 31, quit work until fixing a breakdown.
Obviously, the I/O interface 21 of motor load supervisory control system embodiment of the present invention can also connect the electric actuator of breeze Vertical Mill front and back corollary equipment, transfers to increase the output and the load of adjusting and reducing breeze Vertical Mill front and back corollary equipment.
Monitoring method embodiment 1 is transshipped in the present invention:
As Fig. 4, be depicted as the present invention and transship the block diagram of monitoring method embodiment 1.This motor load monitoring method embodiment adopts monitor monitoring motor and rated current Id thereof in the motor load supervisory control system embodiment frame of broken lines of the present invention, and it comprises the steps: A: the initialization timing;
B: press real-time current I s, the accumulative total tg of tg=0.5 cycle monitoring second motor, and judge whether the overload outage time limit T2 of ∑ tg≤settings, as be judged as and deny, turn to steps A, as to be judged as be to turn to step C;
C: judge whether real-time current Is＞Id,, turn to step D, in this way, turn to step G as not;
D: judge whether real-time current Is＞95%Id,, turn to step e, in this way, turn to step F as not;
E: zero propagation sends to add to produce and adds the load instruction and forbid that the display screen color reports to the police, turns to then step B;
F: zero propagation is forbidden adding producing and is added the load instruction, turn to step B then;
G: the tg of electric current correspondence that zero propagation enforcement display screen color is reported to the police and accumulative total exceeds the quata turns to step H to T1;
H: calculate, judge whether T1/T2＞20%, in this way, turn to step J, as not turning to step I, described T2 value is 30 seconds;
I: zero propagation is forbidden underproduction off-load lotus/reduction current-order, is forbidden audible alarm, turns to step B then;
J: zero propagation sends underproduction off-load lotus/reduction current-order, audible alarm, turns to step B then.
And described monitor is pressed the tz=1 cycle of second, repeatedly begins to carry out described monitoring step from steps A.
Above-mentioned accent increases adjusts and reduce instruction, increase the electric current of adjusting and reducing Vertical Mill motor 10 except transferring, thereby can also transfer the fineness and the flow that increase the tightness increase and decrease abrasive dust of adjusting and reducing hydraulic pressure draw-bar 14, and can further transfer and increase load such as conveying capacity, the output etc. of adjusting and reducing processing apparatus before and after the Vertical Mill.
Monitoring method embodiment 2 is transshipped in the present invention:
As Fig. 5, be depicted as the present invention and transship the block diagram of monitoring method embodiment 2.Present embodiment 2 basic steps are identical with embodiment 1, but it is as follows to have increased the step of manual intervention operation:
Described step e is implemented as step by step: formerly step e 1: zero propagation forbids that the display screen color reports to the police, turns to then step e 2, intermediate steps E2: monitoring has not that the people adds the load instruction for adding to produce, as is judged as and is, turns to step B, as to be judged as deny to turn to step e 3; In back step e 3: zero propagation sends to add to produce and adds the load instruction, turns to step B then.
Described step J is implemented as step by step: step J1 formerly: zero propagation is implemented audible alarm, turned to step J2, intermediate steps J2 then: monitoring has not that the people is the instruction of underproduction off-load lotus, as is judged as and is, turns to step B, as is judged as not, turns to step J3; At back step J3: zero propagation sends underproduction off-load lotus/reduction current-order, turns to step B then.
Present embodiment overload monitoring method can provide the passage of manual intervention regulation and control, improves ease for operation and flexibility.
Claims (10)
1. a motor load monitoring method adopts monitor monitoring motor and rated current Id thereof, and it comprises the steps: A: the initialization timing;
B: press real-time current I s, the accumulative total tg of tg cycle monitoring motor, and judge whether the overload outage time limit T2 of ∑ tg≤settings, as be judged as and deny, turn to steps A, as to be judged as be to turn to step C;
C: judge whether real-time current Is＞Id,, turn to step D, in this way, turn to step G as not;
D: judge whether real-time current Is＞X%Id, as not, turn to step e, in this way, turn to step F, described X value is 93-97;
E: zero propagation sends to add to produce and adds the load instruction and forbid that the display screen color reports to the police, turns to then step B;
F: zero propagation is forbidden adding producing and is added the load instruction, turn to step B then;
G: the tg of electric current correspondence that zero propagation enforcement display screen color is reported to the police and accumulative total exceeds the quata turns to step H to T1;
H: calculate, judge whether TI/T2＞Y%, in this way, turn to step J, as not turning to step I, described Y value is 18-22;
I: zero propagation is forbidden underproduction off-load lotus/reduction current-order, is forbidden audible alarm, turns to step B then;
J: zero propagation sends underproduction off-load lotus/reduction current-order, audible alarm, turns to step B then.
2. motor load monitoring method as claimed in claim 1, it is characterized in that: described step e is implemented as step by step: formerly step e 1: zero propagation forbids that the display screen color reports to the police, turns to then step e 2, intermediate steps E2: monitoring has the people of denying to add the load instruction for adding to produce, as be judged as and be, turn to step B, as be judged as not, turn to step e 3; In back step e 3: zero propagation sends to add to produce and adds the load instruction, turns to step B then.
3. motor load monitoring method as claimed in claim 1, it is characterized in that: described step J is implemented as step by step: step J1 formerly: zero propagation is implemented audible alarm, is turned to step J2 then, intermediate steps J2: monitoring has the people of denying to be the instruction of underproduction off-load lotus, as be judged as and be, turn to step B, as be judged as not, turn to step J3; At back step J3: zero propagation sends underproduction off-load lotus/reduction current-order, turns to step B then.
4. as the described motor load monitoring of one of claim 1-3 method, it is characterized in that: described X value is 95; Described T2 value is 15-120 second.
5. as the described motor load monitoring of one of claim 1-3 method, it is characterized in that: described Y value is 20.
6. as the described motor load monitoring of one of claim 1-3 method, it is characterized in that: described tg value is 0.1-1.0 second, and described T2 value is 30 seconds.
7. as the described motor load monitoring of one of claim 1-3 method, it is characterized in that: described monitor is pressed the tz cycle, repeatedly begins to carry out described monitoring step from steps A, and tz is the 1/30-1/10 of T2.
8. an employing is as the motor load supervisory control system of motor load monitoring method as described in one of claim 1-7; it comprises current monitoring device; the protective relaying device of motor and breaker circuit thereof; the current regulator of control current of electric; the input of described current monitoring device is connected by cable with described breaker circuit; it is characterized in that: described supervisory control system also comprises: the I/O interface; programmable logic controller (PLC) PLC; computer/the display screen of Central Control Room/voice guard; described Central Control Room computer is connected by high speed ether communication network with PLC; described PLC and I/O interface; the output of current monitoring device is connected by industrial field bus, described I/O interface also with the controlled end of described breaker circuit; the controlled end of current regulator is connected by the communications cable.
9. motor load supervisory control system as claimed in claim 8; it is characterized in that: described protective relaying device comprises single-chip microcomputer, signal input port, the instruction outlet of control motor overload outage time limit T2 and rated current Td; the controlled end of described breaker circuit also is connected with described instruction outlet, and described current monitoring device output also is connected with described signal input port.
10. motor load supervisory control system as claimed in claim 1 is characterized in that: described motor is for driving the high-voltage motor of breeze Vertical Mill; Described current regulator comprises the liquid resistance that is connected in the described rotor loop, the traveling electrode of continuous regulator solution volume resistance and the adjusting device of resistance, and described adjusting device comprises contactor and is subjected to the driver of the driving traveling electrode of its control.
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| CN103001185A (en) * | 2011-09-15 | 2013-03-27 | 上海宝钢工业检测公司 | Warning method for instantaneous overload of cold rolling production line looper motor |
| CN103309274A (en) * | 2013-05-17 | 2013-09-18 | 天津市天锻压力机有限公司 | Forging hydraulic press control method based on dual monitoring systems |
| CN103872648A (en) * | 2012-12-11 | 2014-06-18 | 苏州宝时得电动工具有限公司 | Overload protection method used for electric tool and circuit thereof |
| CN104622407A (en) * | 2015-02-05 | 2015-05-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish-washing machine and washing control method and system for same |
| CN105375440A (en) * | 2015-10-30 | 2016-03-02 | 中国兵器工业集团第二O二研究所 | Motor power overloading protection method for gun AC servo system |
| CN106301130A (en) * | 2015-05-13 | 2017-01-04 | 北京和利时电机技术有限公司 | The control method of a kind of automatic load shedding of motor-driven dynamic overload and system |
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| CN105375440A (en) * | 2015-10-30 | 2016-03-02 | 中国兵器工业集团第二O二研究所 | Motor power overloading protection method for gun AC servo system |
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