SK283106B6 - Frequency converter for operating an asynchronous three-phase motor - Google Patents
Frequency converter for operating an asynchronous three-phase motor Download PDFInfo
- Publication number
- SK283106B6 SK283106B6 SK953-97A SK95397A SK283106B6 SK 283106 B6 SK283106 B6 SK 283106B6 SK 95397 A SK95397 A SK 95397A SK 283106 B6 SK283106 B6 SK 283106B6
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- SK
- Slovakia
- Prior art keywords
- frequency converter
- characteristic
- pulse width
- control
- frequency
- Prior art date
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Classifications
-
- 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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4902—Pulse width modulation; Pulse position modulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
Oblasť technikyTechnical field
Vynález sa týka frekvenčného meniča na prevádzku asynchrónneho trojfázového motora.The invention relates to a frequency converter for the operation of an asynchronous three-phase motor.
Doterajší stav technikyBACKGROUND OF THE INVENTION
Meniče na prevádzkové napätie a prevádzkové frekvencie sú požadované napríklad na prevádzku trojfázových motorov s meniteľným počtom otáčok. Konštrukcia takéhoto meniča pozostáva väčšinou z usmerňovania sieťového napätia, medziobvodu jednosmerného napätia, ktorý napríklad pozostáva z kondenzátora na podržanie energie a striedača, napríklad riadiaceho zariadenia na vytváranie požadovaných riadiacich impulzov pre trojfázové výkonové mostíky a z práve týchto výkonových mostíkov.Operating voltage and frequency inverters are required, for example, for the operation of variable-speed three-phase motors. The design of such a transducer consists mostly of rectifying the mains voltage, a DC voltage intermediate circuit, for example consisting of a power holding capacitor and an inverter, for example, a control device for generating the required control pulses for the three-phase power bridges and precisely those power bridges.
Zo spisu DE 41 10 225 Al je známy riadiaci postup a riadiace usporiadanie pre striedač, ktorý je zo strany jednosmerného napätia spojený s indukčným strojom a ktorého spínací stav je nastaviteľný riadiacim a regulačným zariadením. Pritom sa mení zložka menovitej hodnoty, vytvárajúca krútiaci moment v závislosti od zvlnenia napätia medziobvodu jednosmerného napätia. Tento stav techniky vyžaduje nákladný riadiaci postup.DE 41 10 225 A1 discloses a control process and control arrangement for an inverter which is connected to an induction machine on the DC voltage side and whose switching state is adjustable by the control and regulating device. In this case, the nominal component generating the torque varies with the voltage ripple of the DC link. This prior art requires an expensive management procedure.
Ďalej spis DE 41 01 341 Al zverejňuje frekvenčný menič pre asynchrónny trojfázový motor, v ktorom riadiaca elektronika, hlavne mikropočítač, nastavujú prevádzkovú frekvenciu a prevádzkové napätia motora podľa menovitých otáčok. Ak sa odchýlia pritom skutočné otáčky od menovitých otáčok, mikropočítač potom pomocou riadenia šírkou impulzov, budičov a výkonových tranzistorov dorcgulováva prevádzkové napätie, tak aby sa skutočné otáčky rovnali otáčkam menovitým. Na túto reguláciu otáčok je dodatočne vyžadovaný tachogenerátor, čím sa frekvenčný menič predraží.Furthermore, DE 41 01 341 A1 discloses a frequency converter for an asynchronous three-phase motor in which the control electronics, in particular a microcomputer, adjust the operating frequency and the operating voltages of the motor according to the rated speed. If the actual speed deviates from the nominal speed, the microcomputer then uses the pulse width control, drivers and power transistors to adjust the operating voltage so that the actual speed is equal to the rated speed. An additional tachogenerator is additionally required for this speed control, thereby overcharging the frequency converter.
Podstata vynálezuSUMMARY OF THE INVENTION
Uvedené nedostatky do značnej miery odstraňuje frekvenčný menič na prevádzku asynchrónneho trojfázového motora s riadiacim členom na vyhodnotenie modulovaných signálov šírkou pulzov a privádzajúcim ich k jednotlivým výkonovým polovodičovým ventilom meniča, ktorého podstata spočíva v tom, že ďalej obsahuje prispôsobovací člen charakteristiky so vstupom na pripojenie signálu odpovedajúceho zadnej menovitej hodnote bez spätnej väzby, pričom tento prispôsobovací člen charakteristiky má zaťažujúcu charakteristiku so zapamätanými hodnotami na zisťovanie riadiacich napätí, na prispôsobovací člen charakteristiky je pripojený člen pulznej štrkovej modulácie a člen na vytváranie taktov, pričom na riadiaci člen sú pripojené výstupy člena na vytváranie taktov a člena pulznej šírkovej modulácie.These drawbacks are largely eliminated by a frequency converter for operating an asynchronous three-phase motor with a control member for evaluating modulated signals by pulse width and supplying them to the individual power semiconductor valves of the converter, which further comprises an adaptation member having an input for connecting a corresponding signal a back-end rating without feedback, said characteristic adjuster having a load characteristic with stored values for detecting control voltages, a pulse pebble modulation member and a pulse generating member coupled to said characteristic member, the outputs of said pulse generating member being connected to said control member and a pulse width modulation member.
V ďalšom výhodnom uskutočnení frekvenčná napäťová charakteristika prispôsobujúceho člena charakteristiky má tvar paraboly, to znamená F~U2.In another preferred embodiment, the frequency voltage characteristic of the characteristic matching member is in the form of a parabola, i.e., F-U 2 .
V ďalšom výhodnom uskutočnení frekvenčná napäťová charakteristika prispôsobujúceho člena charakteristiky prebieha lineárne, to znamená F~U.In another preferred embodiment, the frequency-voltage characteristic of the characteristic adjusting member is linear, i.e. F-U.
Výhodné je, keď riadiaci člen je programovateľný logický modul.Preferably, the control member is a programmable logic module.
Výhodné je tiež, keď logický modul je modulom GAL.It is also preferred that the logic module is a GAL module.
V ďalšom výhodnom uskutočnení riadiaci člen je prepojený s nadprúdovým komparátorom, ktorý je zo vstupnej strany spojený s kondenzátorom a s meracím odporom.In another preferred embodiment, the control member is coupled to an overcurrent comparator which is connected from the inlet side to a capacitor and a measuring resistor.
V ďalšom výhodnom uskutočnení je frekvenčný menič priradený asynchrónnym trojfázovým motorom v čerpadlách, dúchadlách, najmä v olejových a plynových dúchadlových horákoch.In a further preferred embodiment, the frequency converter is assigned to an asynchronous three-phase motor in pumps, blowers, especially oil and gas blowers.
Prehľad obrázkov na výkresochBRIEF DESCRIPTION OF THE DRAWINGS
Vynález je ďalej bližšie opísaný na základe príkladu uskutočnenia podľa pripojených výkresov, ktoré znázorňujú na obr. 1 blokovú schému asychrónneho trojfázového motora s frekvenčným meničom a na obr. 2 detaily frekvenčného meniča.The invention will now be described in more detail with reference to the accompanying drawings, in which: FIG. 1 shows a block diagram of an asynchronous three-phase motor with a frequency converter, and FIG. 2 details of the drive.
Príklady uskutočnenia vynálezuDETAILED DESCRIPTION OF THE INVENTION
Obr. 1 znázorňuje blokovú schému frekvenčného meniča 1 s riadiacou časťou 2 a výkonovou časťou 4 na prevádzku asychrónneho trojfázového motora 3, ktorého otočný hriadeľ 5 je spojený s kolom 7 vetráka, napríklad na použitie v plynovom dúchadlovom horáku. Frekvenčný menič 1 získava vstupné signály zo vstupného prispôsobovacieho člena 9, ktorým sú dopredu dané menovité hodnoty bez spätnej väzby. Tento vstupný prispôsobovací člen 9 získava menovité hodnoty napríklad z riadiaceho člena 11 bližšie neznázomeného riadenia kotla. Menovité hodnoty môžu pritom predstavovať hodnoty pre napätie medzi 0 V až 10 V alebo pre prúd medzi 4 až 20 mA, pričom otáčky n = 0 zodpovedajú napríklad hodnote napätia 0 V alebo hodnote prúdu 4 mA a otáčky n = nmax hodnote napätia 10 V, prípadne 20 mA. Tieto menovité hodnoty sú dopredu dané napríklad riadením kotla, a sú cez vstupný prispôsobovací člen 9 privádzané na prispôsobovací člen 13 charakteristiky. Tento prispôsobovací člen 13 charakteristiky obsahuje zapamätanú charakteristiku na zisťovanie riadiacich napätí, ktoré sú potom ako vstupné signály privádzané na člen 15 pulznej šírkovej modulácie a člen 17 na vytváranie taktov. Charakteristika v prispôsobovacom člene 13 charakteristiky je frekvenčnou napäťovou charakteristikou a má napríklad tvar paraboly, pričom frekvencia f je úmerná napätiu U na kvadrát, F~U2. Člen 17 na vytváranie taktov vytvára podľa zisteného riadiaceho napätia taktovacie signály napríklad medzi 10 až 80 Hz, ktoré sú ďalej vedené na riadiaci člen 19 na vyhodnotenie. Riadiaci člen 19 získava tiež výstupné signály z člena 15 pulznej šírkovej modulácie, pričom šírka pulzov leží podľa zisteného riadiaceho napätia medzi 10 % až 100%.Fig. 1 shows a block diagram of a frequency converter 1 with a control part 2 and a power part 4 for operating an asynchronous three-phase motor 3 whose rotary shaft 5 is connected to a fan wheel 7, for example for use in a gas blower burner. The frequency converter 1 receives the input signals from the input adaptation member 9, which is given the nominal values without feedback in advance. This input adaptation member 9 obtains nominal values, for example, from a control member 11 of a boiler control (not shown). The nominal values can be values for voltages between 0 V to 10 V or for currents between 4 and 20 mA, where n = 0 corresponds, for example, to 0 V or 4 mA, and n = nmax to 10 V, or 20 mA. These nominal values are predetermined, for example, by the boiler control, and are fed to the characteristic adjusting member 13 via the inlet adapter 9. This characteristic matching element 13 comprises a memorized characteristic for detecting control voltages, which are then applied as input signals to the pulse width modulation member 15 and the pulse generating member 17. The characteristic in the characteristic matching member 13 is a frequency-voltage characteristic and has, for example, a parabola shape, the frequency f being proportional to the voltage U per square, F-U 2 . The clock generating member 17 generates clock signals according to the detected control voltage, for example between 10 and 80 Hz, which are further directed to the control member 19 for evaluation. The control member 19 also receives output signals from the pulse width modulation member 15, wherein the pulse width is between 10% to 100% according to the detected control voltage.
V rámci vynálezu môže frekvenčná napäťová charakteristika prebiehať tiež lineárne, to znamená F~U. Podstatné je, že frekvenčná napäťová charakteristika je prispôsobená na použitie v usporiadaní pohonov.Within the scope of the invention, the frequency voltage characteristic may also be linear, i.e. F-U. It is essential that the frequency response is adapted for use in the drive arrangement.
Riadiaci člen 19 vyhodnocuje šírkou pulzov modulované výstupné signály a zapojuje jednotlivé výkonové polovodičové ventily vo výkonovej časti 4. Výkonová časť 4 môže napríklad pozostávať z troch polovodičových mostíkov. Frekvenčný menič 1 riadi napätia motora podľa požadovaných otáčok trojfázového motora 3, pričom obdĺžnikové točivé pole je vytvárané tromi o 120 stupňov fázovo posunutými fázami a trojfázový motor 3 pracuje s čo možno najvyšším stupňom účinnosti.The control member 19 evaluates pulse width modulated output signals and engages individual power semiconductor valves in the power section 4. The power section 4 may, for example, consist of three semiconductor bridges. The frequency converter 1 controls the motor voltages according to the desired speed of the three-phase motor 3, the rectangular rotating field being generated by three 120 degrees phase-shifted phases and the three-phase motor 3 operating with the highest degree of efficiency.
Riadiaci člen 19 pozostáva z programovateľného modulu, hlavne z modulu GAL.The control member 19 consists of a programmable module, in particular a GAL module.
Na riadiaci člen 19 je pripojený výstupný signál nadprúdového komparátora 21, ktorý je zo strany výstupu spojený s kondenzátorom 23 a meriacim odporom 25.The output signal of the overcurrent comparator 21 is connected to the control member 19 and connected to the capacitor 23 and the measuring resistor 25 from the output side.
Frekvenčný menič 1 podľa vynálezu na prevádzku asychrónneho motora 3 má jednoduchú a lacnú konštrukciu, pretože môže byť upustené od použitia mikroprocesora a zobrazovača parametrov.The frequency converter 1 according to the invention for the operation of the asynchronous motor 3 has a simple and inexpensive design, since it can be dispensed with using a microprocessor and a parameter display.
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19628148A DE19628148A1 (en) | 1996-07-12 | 1996-07-12 | Frequency converter for operating an asynchronous three-phase motor |
Publications (2)
Publication Number | Publication Date |
---|---|
SK95397A3 SK95397A3 (en) | 1998-05-06 |
SK283106B6 true SK283106B6 (en) | 2003-02-04 |
Family
ID=7799664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SK953-97A SK283106B6 (en) | 1996-07-12 | 1997-07-11 | Frequency converter for operating an asynchronous three-phase motor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0823774B1 (en) |
AT (1) | ATE207671T1 (en) |
DE (2) | DE19628148A1 (en) |
SK (1) | SK283106B6 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19921045B4 (en) * | 1998-07-16 | 2008-02-14 | Dreizler, Ulrich, Dipl.-Ing. | Burner for combustion of liquid and / or gaseous fuels in combustion plants |
DE19903779A1 (en) * | 1999-02-01 | 2000-08-03 | Wilo Gmbh | Communication between pump and boiler |
AT412902B (en) * | 2003-09-23 | 2005-08-25 | Vaillant Gmbh | METHOD FOR ADJUSTING THE HEATING PERFORMANCE OF A FAN SUPPORTED HEATER |
EP1701096A1 (en) * | 2005-03-10 | 2006-09-13 | Vaillant GmbH | Method for adapting the heater power of a blower-supported heater to the individual pressure losses of a fresh air/exhaust gas pipe |
DE102009006803A1 (en) * | 2009-01-30 | 2010-08-05 | Amazonen-Werke H. Dreyer Gmbh & Co. Kg | Agricultural field sprayer |
DE102022203427A1 (en) * | 2022-04-06 | 2023-10-12 | BSH Hausgeräte GmbH | Method for operating an inverter, inverter and household appliance |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4101341A1 (en) * | 1991-01-18 | 1992-07-23 | Ako Werke Gmbh & Co | Frequency transverter for operating polyphase induction motor - with control electronics to set operating frequency and voltage according to ideal motor speed |
DE4102893A1 (en) * | 1991-01-31 | 1992-08-06 | Siemens Ag | Pulse width modulated three=phase current converter for washing machine motor - has transistors clocked by fundamental frequency of output voltage in half bridges with diodes in one half |
DE4110225C2 (en) * | 1991-03-28 | 1994-07-21 | Abb Patent Gmbh | Control method and control arrangement for an inverter |
IT1266377B1 (en) * | 1993-05-31 | 1996-12-27 | Merloni Antonio Spa | POWER SUPPLY OF INDUCTION ELECTRIC MOTORS BY MEANS OF ELECTRONIC INVERTERS |
-
1996
- 1996-07-12 DE DE19628148A patent/DE19628148A1/en not_active Withdrawn
-
1997
- 1997-07-03 DE DE59705048T patent/DE59705048D1/en not_active Expired - Fee Related
- 1997-07-03 AT AT97111162T patent/ATE207671T1/en not_active IP Right Cessation
- 1997-07-03 EP EP97111162A patent/EP0823774B1/en not_active Expired - Lifetime
- 1997-07-11 SK SK953-97A patent/SK283106B6/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0823774B1 (en) | 2001-10-24 |
EP0823774A1 (en) | 1998-02-11 |
DE59705048D1 (en) | 2001-11-29 |
DE19628148A1 (en) | 1998-01-15 |
SK95397A3 (en) | 1998-05-06 |
ATE207671T1 (en) | 2001-11-15 |
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