CN108270380A - A kind of method for control speed when frequency converter is without speed encoder - Google Patents
A kind of method for control speed when frequency converter is without speed encoder Download PDFInfo
- Publication number
- CN108270380A CN108270380A CN201711482962.5A CN201711482962A CN108270380A CN 108270380 A CN108270380 A CN 108270380A CN 201711482962 A CN201711482962 A CN 201711482962A CN 108270380 A CN108270380 A CN 108270380A
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- China
- Prior art keywords
- frequency converter
- motor
- torque
- parameter values
- speed
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
Abstract
A kind of method for control speed during the invention discloses frequency converter without speed encoder is related to the speed control of frequency converter, includes the following steps：Reset motor static torque P278 parameters；Static torque P278 parameter values to live motor is slowly increased to occur stopping in the case of pico- rotation；Static torque P278 parameter values are slowly turned down motionless to motor；Motor dynamics torque P279 parameter values are adjusted again；Motor power transmission is given, makes its no-load running；In motor operation course, slowly reduce dynamic torque P279 parameter values, giving current waveform and actual current waveform for frequency converter is checked simultaneously, when the adjustment stopped when giving current waveform and being overlapped with actual current waveform to dynamic torque P279 parameter values of frequency converter.After the present invention is implemented, the time resumed production after motor encoder damage is substantially reduced, and reduce the workload of field device repairing.
Description
Technical field
The present invention relates to the controlling technology of velocity field of frequency converter, during more particularly to a kind of frequency converter without speed encoder
Method for control speed.
Background technology
Since requirement of the scene to major motor running precision is very high, both it was required to have capability of fast response and moment
Big torque output, and require it that cannot occur flowing through temperature greatly, so increase speed feedback coder in motor side at the beginning of design,
Effect be in motor operation by motor actual speed feed back to frequency converter and frequency converter given speed compare after adjust in real time
Whole given speed so as to fulfill velocity close-loop control, achievees the purpose that accurately to control.But due to field working conditions item in real work
Part is poor, and the encoder of velocity feedback is the accurate equipment of a comparison again, so encoder in the actual production process
Spoilage it is still higher.Directly the replacement production time in stopping time is longer after encoder damage, such as by Frequency Converter Control mode
Caused by being mismatched when being directly changed to open loop or current closed-loop, can resume production, but can't resolve production temporarily due to speed
The problem of frequently triggering overcurrent and excess temperature are alarmed.
Invention content
The present invention is for above-mentioned technical problem, the shortcomings that overcoming the prior art, provides a kind of frequency converter without speed encoder
When method for control speed, it is quick in the case where being changed without encoder after mainly damaging live motor speed encoder
Restore accurate control of the frequency converter to the speed of live motor.
In order to solve the above technical problems, a kind of speed control side when present invention provides frequency converter without speed encoder
Method, frequency converter are Siemens's 6SE70 frequency converters, are included the following steps：
S1, motor static torque P278 parameters are reset first, static torque P278 parameter values are arranged on 5 ~ 10% ranges
It is interior；
S2, static torque P278 parameter values are slowly increased, increase to live motor always and occur stopping in the case of pico- rotation
Only；
S3, static torque P278 parameter values are slowly turned down, turns down motionless to motor, observe quiescent current at this time, number
Value is maintained in the range of 10 ~ 40%；
S4, motor dynamics torque P279 parameter values are adjusted again, dynamic torque P279 parameter values are arranged on 10 ~ 30% ranges
It is interior；
S5, motor power transmission is given, makes its no-load running；
S6, in motor operation course, slowly reduce dynamic torque P279 parameter values, at the same check frequency converter to constant current
Waveform and actual current waveform, when stopping when giving current waveform and being overlapped with actual current waveform to dynamic torque for frequency converter
The adjustment of P279 parameter values.
The technical solution that further limits of the present invention is：
Further, the numerical value amplification of static torque P278 parameters is 40% in step S2.
Further, after carrying out step S6, the P471 parameter devices of frequency converter torque pre-control are further added by.
Further, according to live motor load difference, according to live motor load difference, increase frequency converter torque pre-control
The numerical value of the P471 parameter devices of system is between 30 ~ 80%.
The beneficial effects of the invention are as follows：After the present invention mainly damages live motor speed encoder, it is being changed without encoding
In the case of device, accurate control of the fast quick-recovery frequency converter to the speed of live motor.Meanwhile increase frequency converter torque pre-control
P471 parameter devices, improve the response speed of motor, and be unlikely to overcurrent.Therefore, response is timely during present invention operation,
Torque reaches requirement, actual speed matching, and inverter current controls in the reasonable scope and will not cause overcurrent and excess temperature report
It is alert；After implementing use, the time resumed production after motor encoder damage is substantially reduced, and reduces field device repairing
Workload.
Description of the drawings
Fig. 1 is the schematic diagram of the present embodiment；
Fig. 2 is the encoder velocity feedback waveform diagram of the present embodiment.
Specific embodiment
Method for control speed when a kind of frequency converter provided in this embodiment is without speed encoder, frequency converter are Siemens
6SE70 frequency converters, include the following steps：
S1, motor static torque P278 parameters are reset first, static torque P278 parameter values are arranged on 5 ~ 10% ranges
It is interior；
S2, static torque P278 parameter values are slowly increased, the numerical value amplification of static torque P278 parameters is 10 ~ 40%, is increased always
Live motor is added to occur stopping in the case of pico- rotation；
S3, static torque P278 parameter values are slowly turned down, turns down motionless to motor, observe quiescent current at this time, number
Value is maintained in the range of 40%；
S4, motor dynamics torque P279 parameter values are adjusted again, dynamic torque P279 parameter values are arranged on 10 ~ 30% ranges
It is interior；
S5, motor power transmission is given, makes its no-load running；
S6, in motor operation course, slowly reduce dynamic torque P279 parameter values, at the same check frequency converter to constant current
Waveform and actual current waveform, when stopping when giving current waveform and being overlapped with actual current waveform to dynamic torque for frequency converter
The adjustment of P279 parameter values；
S7, the P471 parameter devices for increasing frequency converter torque pre-control according to live motor load difference, increase frequency converter torque
The numerical value of the P471 parameter devices of pre-control is between 30 ~ 80%.
Operation principle：
It is basic still with other in order to reduce the electrical fault frequency and reduce encoder spare part expense and reduction human cost
Control mode substitution encoder velocity close-loop control, finally cancel encoder, live failure frequency highest reduced with this
Trouble point.
It is controlled with frequency converter open loop approach, is found in actual experiment, due to field device dynamic under opened loop control
It is required that it is high, it is anxious to accelerate instantaneous overcurrent alarm be caused to shut down with anxious deceleration.With inverter current closed-loop control, suddenly accelerate and anxious
Preferably but during motor operation overall current is excessive for current control during deceleration, is varied slightly close to overcurrent threshold values, such as field load
Overtemperature alarm caused by may there is overcurrent and long-time high current, operation are extremely unstable.But closed-loop current control is
The method of the only possible substitution encoder velocity close-loop control of frequency converter at present.So mainly solved during experiment,
Load requirement when static state and current intelligence decline low current output but meet live motor operation again when equipment belt carries.
It is mainly to reduce the static state of frequency converter and dynamical output torque to reach drop to reduce quiescent current and dynamic current
The purpose of low current.
As shown in Fig. 2, after series of parameters is set and is optimized, Frequency Converter Control mode P100 is changed to current closed-loop
Control, while detect the frequency converter reality output velocity wave form under closed-loop current control, speed preset waveform and be not involved in controlling
System is used for the encoder velocity feedback waveform of experiment, wherein：2 be speed preset, and 3 export for frequency converter actual speed, and 4 be existing
Field encoder velocity feedback, these three speed are consistent.
Working example：
In October, 2017, entrance pinch roll velocity anomaly was batched by cut deal volume factory, checks and finds the whole circuit of encoder velocity feedback
And encoder breaks down.Implemented according to the method described above：
S1, motor static torque P278 parameters are reset first, static torque P278 parameter values are arranged on 5 ~ 10% ranges
It is interior；
S2, static torque P278 parameter values are slowly increased, the numerical value amplification of static torque P278 parameters is 10 ~ 40, is increased always
Live motor is added to occur stopping in the case of pico- rotation；
S3, static torque P278 parameter values are slowly turned down, turned down motionless to motor；P278=19 at this time, observation are static
Electric current is maintained at 120A or so；
S4, motor dynamics torque P279 parameter values are adjusted again, dynamic torque P279 parameter values are arranged on 10 ~ 30% ranges
It is interior；
S5, motor power transmission is given, makes its no-load running；
S6, in motor operation course, slowly reduce dynamic torque P279 parameter values, at the same check frequency converter to constant current
Waveform and actual current waveform, when stopping when giving current waveform and being overlapped with actual current waveform to dynamic torque for frequency converter
The adjustment of P279 parameter values；P279 is reduced to 27 from original 36 at this time, and electric current is maintained in load running within 300A；
S7, the P471 parameter devices for increasing frequency converter torque pre-control are stepped up the P471 parameters of frequency converter torque pre-control
The numerical value of equipment, the electric current and velocity wave form when P471=47%, electric motor starting are most gentle.
Eventually pass through series of parameters setting and optimization after, coiling clamp roller motor in the case of without using encoder just
Normal stable operation batches the damage of outlet of still bottom pinch roll encoder in November, 2017, no coding is also achieved with same method
Velocity accuracy stability contorting under device velocity feedback.
Application prospect and economic benefit of the present invention：
24 hours failure stopping times are saved by annual, per hour 200 tons of steel yield, one ton of benefit, 500 yuan of calculating：24*200*500
=240 ten thousand yuan；10 encoder spare parts are saved by annual, average 1 by 30,000 yuan of calculating：10*3=300,000 yuan.Therefore, it is of the invention
Implementation can obtain a year total benefit：240+30=2,700,000 yuan.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the present invention claims protection domain.
Claims (4)
- Method for control speed when 1. a kind of frequency converter is without speed encoder, the frequency converter is Siemens's 6SE70 frequency converters, It is characterized in that, includes the following steps：S1, motor static torque P278 parameters are reset first, static torque P278 parameter values are arranged on 5 ~ 10% ranges It is interior；S2, static torque P278 parameter values are slowly increased, increase to live motor always and occur stopping in the case of pico- rotation Only；S3, static torque P278 parameter values are slowly turned down, turns down motionless to motor, observe quiescent current at this time, number Value is maintained in the range of 10 ~ 40%；S4, motor dynamics torque P279 parameter values are adjusted again, dynamic torque P279 parameter values are arranged on 10 ~ 30% ranges It is interior；S5, motor power transmission is given, makes its no-load running；S6, in motor operation course, slowly reduce dynamic torque P279 parameter values, at the same check frequency converter to constant current Waveform and actual current waveform, when stopping when giving current waveform and being overlapped with actual current waveform to dynamic torque for frequency converter The adjustment of P279 parameter values.
- Method for control speed when 2. a kind of frequency converter according to claim 1 is without speed encoder, it is characterised in that：Institute The numerical value amplification for stating static torque P278 parameters in step S2 is 40%.
- Method for control speed when 3. a kind of frequency converter according to claim 1 is without speed encoder, it is characterised in that：Into After the row step S6, it is further added by the P471 parameter devices of frequency converter torque pre-control.
- Method for control speed when 4. a kind of frequency converter according to claim 3 is without speed encoder, it is characterised in that：Root According to live motor load difference, increase the numerical value of P471 parameter devices of frequency converter torque pre-control between 30 ~ 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711482962.5A CN108270380B (en) | 2017-12-29 | 2017-12-29 | Speed control method for frequency converter without speed encoder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711482962.5A CN108270380B (en) | 2017-12-29 | 2017-12-29 | Speed control method for frequency converter without speed encoder |
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| Publication Number | Publication Date |
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| CN108270380A true CN108270380A (en) | 2018-07-10 |
| CN108270380B CN108270380B (en) | 2020-10-27 |
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| CN201711482962.5A Active CN108270380B (en) | 2017-12-29 | 2017-12-29 | Speed control method for frequency converter without speed encoder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113497583A (en) * | 2021-05-06 | 2021-10-12 | 本钢板材股份有限公司 | Method for converting control mode of frequency converter of triple cold rolling continuous annealing unit to electric frequency motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6591200B1 (en) * | 1998-06-16 | 2003-07-08 | M.E.A. Motor Inspection Ltd. | Method and system for performance testing of rotating machines |
| CN104065318A (en) * | 2014-06-26 | 2014-09-24 | 中冶南方（武汉）自动化有限公司 | Frequency converter closed-loop vector redundancy control method during high-speed operation |
-
2017
- 2017-12-29 CN CN201711482962.5A patent/CN108270380B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6591200B1 (en) * | 1998-06-16 | 2003-07-08 | M.E.A. Motor Inspection Ltd. | Method and system for performance testing of rotating machines |
| CN104065318A (en) * | 2014-06-26 | 2014-09-24 | 中冶南方（武汉）自动化有限公司 | Frequency converter closed-loop vector redundancy control method during high-speed operation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113497583A (en) * | 2021-05-06 | 2021-10-12 | 本钢板材股份有限公司 | Method for converting control mode of frequency converter of triple cold rolling continuous annealing unit to electric frequency motor |
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| Publication number | Publication date |
|---|---|
| CN108270380B (en) | 2020-10-27 |
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