CN103001569B - High-pressure frequency-conversion motor idler revolutions tracking - Google Patents
High-pressure frequency-conversion motor idler revolutions tracking Download PDFInfo
- Publication number
- CN103001569B CN103001569B CN201210453696.4A CN201210453696A CN103001569B CN 103001569 B CN103001569 B CN 103001569B CN 201210453696 A CN201210453696 A CN 201210453696A CN 103001569 B CN103001569 B CN 103001569B
- Authority
- CN
- China
- Prior art keywords
- voltage
- motor
- frequency
- current
- scanning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a kind of high-pressure frequency-conversion motor idler revolutions tracking, without the need to velocity transducer, by then detecting torque current to the motor input scan voltage rotated freely, under the prerequisite controlling size of current, utilize microprocessor to calculate power of motor, when power of motor is from time turning to 1 boundary's point of negative value, then thinks and rotating speed detected.By indirectly judging rotor frequency thus reaching the stator object synchronous with rotor speed.The present invention does not need operating speed transducer, realizes the level and smooth startup of high-voltage motor under rotor non-stationary conditions, and start steadily, algorithm is simple, is easy to realize, and does not need to increase cost.
Description
Technical field
The present invention relates to high-pressure frequency-conversion control technology field, particularly relate to one and be applied to high-voltage motor frequency-changing control system mesohigh variable-frequency motor idler revolutions tracking.
Background technology
High-power high voltage frequency converter is widely used in various blower fans, the pump apparatus of the industries such as petrochemical industry, electric power, metallurgy, urban construction, at energy-conservation of consumption reduction, improves the important roles such as technique.In many large-scale motor driving systems, particularly in blower fan application scenario, the moment of inertia of its rotor and institute's carrying device is all very large, and the free parking time from rotation status to inactive state is from dozens of minutes by several hours.If there is transducer power-down, motor rotates freely to re-power immediately directly to start and often causes over current of motor because torque current is excessive, not only the continuous operation of finishing equipment also can not will cause infringement and the loss of equipment.In some application scenario, the whole system that will cause out of service of motor stops production, and unexpected shutdown can bring immeasurable economic loss to user.Other pump class application scenario at high voltage converter " drag many " and " industrial frequency-variable frequency " switch occasion, level and smooth start-up technique under all needing motor free rotation state.
The method realizing this function at present has multiple: the method if any installation rate transducer on high-voltage motor follows the trail of that motor rotates freely frequency, by hardware frequency detection method to motor feedback voltage, these methods all need additionally to install speed measuring equipment.For the VVVF control mode of Speedless sensor, the way of search mentioning rotor frequency in Siemens's application manual has two kinds: one is called " stator inputs constant VF curve comparison method ".The method possible in theory, but in practical application, this method is difficult to ensure accuracy.Another kind is called " DC bus minimum current method ".The method theory is feasible, but detects without DC bus current in high voltage transducer power unit, therefore can not adopt the scheme detecting DC bus current indirect detection rotor frequency.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of high-pressure frequency-conversion motor idler revolutions
Tracking.
The present invention is achieved by the following technical solutions:
A kind of high-pressure frequency-conversion motor idler revolutions tracking, when high-voltage motor rotates freely, utilize digital signal processing chip DSP to high-voltage motor input scan voltage, the proportional relation of UF curve when described scanning voltage and high-voltage motor normally run, scanning voltage and scanning frequency one_to_one corresponding and change along with the change of scanning frequency, the output current of sampling high-voltage motor, digital signal processing chip DSP calculates the instantaneous value of third phase according to the biphase current instantaneous value of sampling out, total current phasor value is calculated according to the instantaneous value of three-phase current, and ensure the change of electric current setting scope within, digital signal processing chip DSP calculates the power of motor under Current Scan frequency according to the instantaneous value of three-phase current, when power of motor is Current Scan frequency by frequency when then judging that high-voltage motor dallies in time changing to 1 boundary's point of negative value, at this scanning frequency point, voltage is progressively increased to the magnitude of voltage of normal UF curve from scanning voltage, with the voltage of normal UF curve for target, frequency converter output voltage is raised progressively, make the startup that high-voltage motor is level and smooth.
The excursion of described scanning frequency for from+50HZ with 0.5HZ increments to 0HZ, then be incremented to 0HZ by-50HZ with 0.5HZ step-length.
Advantage of the present invention is: the present invention does not need operating speed transducer, realizes the level and smooth startup of high-voltage motor under rotor non-stationary conditions, and start steadily, algorithm is simple, is easy to realize, and does not need to increase cost.
Accompanying drawing explanation
Fig. 1 is software flow pattern of the present invention.
Fig. 2 is the UF curve of high-voltage motor.
Embodiment
As shown in Figure 1, a kind of high-pressure frequency-conversion motor idler revolutions tracking, when high-voltage motor rotates freely, utilize digital signal processing chip DSP to high-voltage motor input scan voltage, the proportional relation of UF curve when described scanning voltage and high-voltage motor normally run, scanning voltage and scanning frequency one_to_one corresponding and change along with the change of scanning frequency, UF curve as shown in Figure 2, the output current of sampling high-voltage motor, digital signal processing chip DSP calculates the instantaneous value of third phase according to the biphase current instantaneous value of sampling out, total current phasor value is calculated according to the instantaneous value of three-phase current, and ensure the change of electric current setting scope within, digital signal processing chip DSP calculates the power of motor under Current Scan frequency according to the instantaneous value of three-phase current, when power of motor is Current Scan frequency by frequency when then judging that high-voltage motor dallies in time changing to 1 boundary's point of negative value, at this scanning frequency point, voltage is progressively increased to the magnitude of voltage of normal UF curve from scanning voltage, with the voltage of normal UF curve for target, frequency converter output voltage is raised progressively, make the startup that high-voltage motor is level and smooth.
The excursion of described scanning frequency for from+50HZ with 0.5HZ increments to 0HZ, then be incremented to 0HZ by-50HZ with 0.5HZ step-length.
Because when high voltage motor stator rotating magnetic field speed is lower than spinner velocity, high-voltage motor is generating state, high-voltage motor rotor will charge to the anti-energy that send of stator side to capacitor of frequency converter, make the overvoltage of capacitor of frequency converter voltage pump rise, therefore search procedure must from higher than high-voltage motor rotor frequency, consider that all possibilities scan from the initial high voltage converter of+50HZ the motor rotated freely, if the UF curve directly normally run according to high-voltage motor will export " full scale " voltage, this is just similar to " full voltage starting ", electric current and torque shock ends very big.Therefore voltage determines scanning voltage corresponding to each scanning frequency after getting 5% ~ 20% output of full scale and scaled UF curve magnitude of voltage.Because when general high voltage motor rotates freely, be equivalent to generator, can measure the voltage of tens volts of sizes at motor output end, the so lower scanning voltage input motor of this magnitude of voltage can not affect rotating freely of motor and make frequency converter current of electric sample circuit can monitor the change waveform of current of electric.The variation tendency of scanning frequency, for first progressively reducing frequency to 0HZ from+50HZ, is progressively scanning 0HZ from-50HZ, using 0.5HZ as search change step in the excursion of this scanning frequency.Again according to the judgement of following condition as the free rotating speed point of motor.First, Vector operation is entered to the instantaneous value of every sample rate current, and the scope of this value and setting is made comparisons, only have current phasor to be less than when namely this scope represents that current motor rotates freely steady and carry out power calculation again.Current motor operate power can be accurately calculated by the current of electric instantaneous value of sampling, this performance number is that timing shows that motor is in generating state, when power of motor is for then thinking that frequency converter is in motoring condition to power input to machine motor time negative, thus get power by the occasion of 1 boundary's point to negative value for tracking to obtain rotating speed point.Frequency converter output voltage is raised, until voltage rises to normal UF curve from this point.And then accelerate according to target frequency, finally realize smoothly restarting of the motor rotated freely.
Claims (2)
1. a high-pressure frequency-conversion motor idler revolutions tracking, it is characterized in that: when high-voltage motor rotates freely, utilize digital signal processing chip DSP to high-voltage motor input scan voltage, the proportional relation of UF curve when described scanning voltage and high-voltage motor normally run, scanning voltage and scanning frequency one_to_one corresponding and change along with the change of scanning frequency, the output current of sampling high-voltage motor, digital signal processing chip DSP calculates the instantaneous value of third phase according to the biphase current instantaneous value of sampling out, total current phasor value is calculated according to the instantaneous value of three-phase current, and ensure the change of electric current setting scope within, digital signal processing chip DSP calculates the power of motor under Current Scan frequency according to the instantaneous value of three-phase current, when power of motor is Current Scan frequency by frequency when then judging that high-voltage motor dallies in time changing to 1 boundary's point of negative value, at this scanning frequency point, voltage is progressively increased to the magnitude of voltage of normal UF curve from scanning voltage, with the voltage of normal UF curve for target, frequency converter output voltage is raised progressively, make the startup that high-voltage motor is level and smooth.
2. high-pressure frequency-conversion motor idler revolutions tracking according to claim 1, is characterized in that: the excursion of described scanning frequency for from+50HZ with 0.5HZ increments to 0HZ, then be incremented to 0HZ by-50HZ with 0.5HZ step-length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210453696.4A CN103001569B (en) | 2012-11-13 | 2012-11-13 | High-pressure frequency-conversion motor idler revolutions tracking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210453696.4A CN103001569B (en) | 2012-11-13 | 2012-11-13 | High-pressure frequency-conversion motor idler revolutions tracking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103001569A CN103001569A (en) | 2013-03-27 |
| CN103001569B true CN103001569B (en) | 2015-10-07 |
Family
ID=47929797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210453696.4A Expired - Fee Related CN103001569B (en) | 2012-11-13 | 2012-11-13 | High-pressure frequency-conversion motor idler revolutions tracking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103001569B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113259B (en) * | 2014-07-29 | 2017-03-29 | 深圳市步科电气有限公司 | A kind of converter follows the trail of the method and its device of motor speed |
| CN108075707B (en) * | 2017-11-16 | 2021-02-02 | 中冶南方（武汉）自动化有限公司 | Asynchronous motor restarting method and system based on V/f control mode |
| CN112491310B (en) * | 2020-11-23 | 2022-06-17 | 北京信息科技大学 | Sensorless starting method of brushless direct current motor with large-inertia rotor |
| CN112713842B (en) * | 2020-12-19 | 2022-07-05 | 中冶南方（武汉）自动化有限公司 | Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor |
| CN114389503B (en) * | 2021-12-20 | 2024-06-14 | 华中科技大学 | A method and device for initial speed identification and belt speed re-throw control of an asynchronous motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166695A (en) * | 2005-12-09 | 2007-06-28 | Hitachi Appliances Inc | Electric motor control device |
| CN101098122A (en) * | 2006-06-28 | 2008-01-02 | 北京利德华福电气技术有限公司 | Method for driving synchronous machine to operation using power source type frequency converter |
| CN101771372A (en) * | 2008-12-29 | 2010-07-07 | 襄樊创新源电气有限公司 | Method for driving starting of rotary motor by high-voltage transducer |
| EP2273665A2 (en) * | 2009-07-09 | 2011-01-12 | Hitachi, Ltd. | Control unit and control method for permanent magnet synchronous motor |
| CN102299679A (en) * | 2011-08-30 | 2011-12-28 | 中冶南方（武汉）自动化有限公司 | Method for determining rotating speed of restarted asynchronous motor |
-
2012
- 2012-11-13 CN CN201210453696.4A patent/CN103001569B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166695A (en) * | 2005-12-09 | 2007-06-28 | Hitachi Appliances Inc | Electric motor control device |
| CN101098122A (en) * | 2006-06-28 | 2008-01-02 | 北京利德华福电气技术有限公司 | Method for driving synchronous machine to operation using power source type frequency converter |
| CN101771372A (en) * | 2008-12-29 | 2010-07-07 | 襄樊创新源电气有限公司 | Method for driving starting of rotary motor by high-voltage transducer |
| EP2273665A2 (en) * | 2009-07-09 | 2011-01-12 | Hitachi, Ltd. | Control unit and control method for permanent magnet synchronous motor |
| CN102299679A (en) * | 2011-08-30 | 2011-12-28 | 中冶南方（武汉）自动化有限公司 | Method for determining rotating speed of restarted asynchronous motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103001569A (en) | 2013-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103001569B (en) | High-pressure frequency-conversion motor idler revolutions tracking | |
| CN104898055B (en) | Motor status determination methods and device | |
| CN103916000B (en) | Converter Fly a car start control method | |
| CN103166566B (en) | Three-phase motor drive control device for turbomolecular pump | |
| CN103078563B (en) | The software implementation method that high voltage converter driving starts surely frequently | |
| CN102629849B (en) | A kind of device of online adaptation of motor for automatic operation at optimum efficiency | |
| CN102315622A (en) | Transformation of electrical energy system and transformation of electrical energy device | |
| CN107402350B (en) | A method for detecting eccentricity fault of three-phase asynchronous motor | |
| WO2017174957A2 (en) | Method and apparatus for controlling three-phase electric motor | |
| CN101272114B (en) | Frequency conversion control device of DC motor | |
| CN105262403B (en) | A kind of electric rotating machine directly initiates control method | |
| CN101931353A (en) | Control method for brushless direct current motor for automotive air conditioning fan | |
| CN103856132A (en) | Control system of alternating current servo permanent magnet synchronous motor | |
| CN108462425A (en) | The variable frequency regulating speed control method and system of monophase machine | |
| CN102565447B (en) | Method for searching motor rotor frequency in process of starting flying car with high voltage inverter | |
| CN105915149B (en) | The accurate discrimination method of motor speed after being powered off in discontinuous power supply Energy Saving Control | |
| CN109660179B (en) | Speed detection starting method for frequency converter | |
| CN107681926B9 (en) | motor starting control method and device | |
| CN104767441A (en) | Power control system and method | |
| CN203457094U (en) | System for controlling AC servo permanent magnet synchronous motor | |
| CN105048512A (en) | PMSM (permanent magnet synchronous motor) grid-connected operation control method and system, and quasi-synchronization controller | |
| CN202513872U (en) | Device for adapting motor to automatically run at optimum efficiency in on-line type | |
| CN103023425A (en) | Idle speed measuring circuit of high-voltage inverter motor | |
| CN105958875A (en) | High precision speed regulation control method of speed sensorless permanent magnet synchronous motor | |
| CN103023392A (en) | Low-voltage frequency converter with rotate speed tracking start |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20161113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |