WO2001065678A1 - Verfahren zur verlustarmen steuerung eines asynchronmotors - Google Patents
Verfahren zur verlustarmen steuerung eines asynchronmotors Download PDFInfo
- Publication number
- WO2001065678A1 WO2001065678A1 PCT/EP2001/002241 EP0102241W WO0165678A1 WO 2001065678 A1 WO2001065678 A1 WO 2001065678A1 EP 0102241 W EP0102241 W EP 0102241W WO 0165678 A1 WO0165678 A1 WO 0165678A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- current
- control
- values
- control device
- Prior art date
Links
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
- H02P27/02—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using supply voltage with constant frequency and variable amplitude
Definitions
- the invention relates to a method for low-loss control of an asynchronous motor.
- DE 35 23 529 A1 describes a method for reducing the iron and copper losses in an induction motor which has solid-state switches as voltage control, the voltage applied being able to be set to desired values by gate and / or gate control.
- the control electrodes of the solid-state switches are connected to the outputs of a microcomputer.
- the induction motor is operated in such a way that the measured total current / is kept as small as possible by reducing the proportion of the no-load current / -, the no-load current /. is stored as a curve for the ignition angle ⁇ currently used in the voltage control.
- the required load current / ⁇ / is determined from the total current / and the no-load current / o.
- the ignition angle ⁇ is changed in order to reduce the proportion of the no-load current in the total current, and it is checked whether the required load current is still being generated.
- the minimum total current for a specific load current is determined by multiple (empirical) variations of the ignition angle ⁇ .
- the known method is said to achieve the minimum current. However, this does not correspond to the minimum loss, which is at a slightly different voltage. The known method is therefore amenable to further improvement.
- the invention has for its object to minimize the losses in an asynchronous motor depending on the load with simple means and little effort.
- the object is achieved by a method having the features of claim 1.
- a voltage control by means of a three-phase voltage regulator, a current measuring device, a voltage measuring device and a control device for voltage control are provided for the loss-minimized operation of asynchronous motors.
- the method according to the invention has the following method steps:
- the voltage for high-efficiency operation is controlled depending on the current value.
- These related pairs of values of current and voltage for loss-minimized operation are determined and stored in the control device. Using the pairs of values described enables loss-minimized operation (i.e. operation at maximum efficiency) of the asynchronous motor with different loads.
- the associated pairs of values of current and voltage for a loss-minimized operation are measured in a machine-specific manner by varying the voltage at different loads on the asynchronous motor, measuring associated currents and determining those voltages and currents at which the losses are minimal are.
- the values for voltages and currents determined in this way are stored as the value pairs mentioned.
- the associated pairs of values of current and voltage are used for a Pleasure minimized operation determined by calculating using known or easily determinable machine parameters.
- this method no measurements on the asynchronous motor are necessary. Rather, it is sufficient to start from machine-specific parameters, which are specified, for example, on the nameplate of the asynchronous motor or can be determined by simple measurements.
- the associated pairs of values of current and voltage are approximated linearly for loss-minimized operation.
- two pairs of values of current and voltage are determined for loss-minimized operation, and a linear dependency is assumed between them.
- the voltage of the motor is measured and fed to the control device as an actual value. This makes it possible to set the voltage at the motor terminals precisely to the value that leads to the desired minimum loss in the asynchronous motor in the respective load case.
- the voltage measurement can also be used to carry out stable control of the asynchronous motor when the load changes.
- the measured voltage at the motor terminals is corrected. This is necessary because the induced voltage that appears at the terminals when the current from the main field of the motor, which is still unchanged, falsifies the value measured by the voltage measuring device. This current interruption occurs when two thyristors of at least one strand arranged in antiparallel are not in the conductive state. As a result, the motor is virtually disconnected from the mains, and the voltage which falsifies the measured values and is induced by the still unchanged main field of the motor acts on the voltage measuring device.
- the induced voltage which falsifies the measured value of the voltage measuring device and which appears at the terminals when the current is interrupted by the still unchanged main field of the motor is taken into account, as a result of which the value actually generated by the voltage control arises and can be supplied to the control device.
- the controller of the control device subtracts the calculable voltage induced by the main field of the asynchronous motor from the measurement result of the voltage measuring device.
- the voltage control has in each feed line an antiparallel pair of thyristors for a gate control (three-phase voltage regulator), the gate connections of the thyristors being connected to the control device.
- a gate control three-phase voltage regulator
- the use of such a gate control enables the tension to be set comparatively easily.
- the starting angle which can be adjusted between 0 and ⁇ , serves as the voltage setting variable for the gate control.
- the control device expediently has a microprocessor which stores the associated pairs of values for current and voltage for loss-minimized operation, carries out voltage calculations for correcting the values measured by the voltage measuring device and triggers the corresponding control processes.
- an input and output device is provided which is connected to the control unit.
- the input and output device can be used to enter parameters for the control and to display the sizes of the motor operation.
- Such an input and output is particularly important in the control method described above, which uses motor-specific data to calculate the optimal pairs of values for current and voltage for loss-minimized operation
- Output device advantageous in order to be able to enter the engine-specific characteristics from the nameplate of the engine or the results of simple measurements.
- the single figure shows an asynchronous motor 10, in the supply line 12 of which the current is measured and passed on to the controller 16.
- the controller 16 uses the current measured via the current measuring device 14 to determine the control signals (ignition delay angle) for the thyristors 18 and 20 as a function of the voltage associated with this current.
- An antiparallel thyristor pair 18, 20 is arranged in each line to the asynchronous motor 10, which carries out a corresponding gate control of the mains voltage.
- the curve shape of the resulting voltage is no longer sinusoidal, but contains harmonics.
- the controller 16 is connected to an input and output device 22, which allows machine-specific parameters to be entered. Variables relating to the operation of the engine can also be displayed there.
- a voltage measurement 24 is provided, which measures the voltage between two supply lines and forwards it to the controller 16.
- Associated pairs of values of current and voltage are stored in the controller 16 for loss-minimized operation in order to realize an optimal voltage control.
- the value pairs can be calculated using engine-specific data or simple measurements. With a preferred contract The following information is used for the motor under consideration during the calculation:
- the number of pole pairs p is determined as the smallest whole number below the coefficient C. The synchronous speed thus results
- the parameters of the machine model can be determined from the available information as follows:
- the no-load current is shown as
- Machine model can be determined.
- the machine model takes into account approximately two non-linearities that take effect when the transition to operating states that lie outside of rated operation occurs: the non-linearity of the magnetization characteristic and the influence of the winding resistances.
- the magnetization characteristic " is a function of tension
- U ⁇ approximates that, in addition to a linear term, contains a second term, which goes with H, 6 and becomes effective according to a saturation factor F., "which is between 0.5 and 1.0, and the ratio of the air gap fraction to the total magnetic voltage drop indicates at rated voltage.
- F. saturation factor
- the values for depend on the reference temperature the heat class.
- the factor Wc expresses the extent to which the change in the losses of the respective winding affects its excess temperature. It will be between 0.5 and a maximum of 1.0 if the change in loss leads to a proportional change in the overtemperature.
- the stator current as a function of the slip is represented by the above parameters as
- the total losses are the sum of the individual losses, so that
- the currents, powers and losses as well as the relative losses as a function of the slip can be determined for a given voltage.
- the relative losses go through a minimum at a certain value of the slip.
- a stator current .j m ⁇ n belongs to this value of the slip.
- the entire characteristic curve can be determined by varying in the area of interest.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU40661/01A AU4066101A (en) | 2000-03-01 | 2001-02-28 | Method for the low-loss control of an asynchronous motor |
EP01911705A EP1269621A1 (de) | 2000-03-01 | 2001-02-28 | Verfahren zur verlustarmen steuerung eines asynchronmotors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10009861A DE10009861A1 (de) | 2000-03-01 | 2000-03-01 | Verfahren zur verlustarmen Steuerung eines Asynchronmotors |
DE10009861.4 | 2000-03-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001065678A1 true WO2001065678A1 (de) | 2001-09-07 |
Family
ID=7633033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/002241 WO2001065678A1 (de) | 2000-03-01 | 2001-02-28 | Verfahren zur verlustarmen steuerung eines asynchronmotors |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1269621A1 (de) |
AU (1) | AU4066101A (de) |
DE (1) | DE10009861A1 (de) |
WO (1) | WO2001065678A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7102323B2 (en) * | 2004-11-30 | 2006-09-05 | Honeywell International Inc. | High power density/limited DC link voltage synchronous motor drive |
DE102005036802C5 (de) * | 2005-08-02 | 2008-10-30 | Jürgen Gattner | Verfahren und Vorrichtung zur Steigerung der Effizienz eines Elektromotors |
KR20130108497A (ko) | 2010-01-12 | 2013-10-04 | 엠카 레겔테흐닉 아게 | 향상된 효율을 가진 비동기식 모터의 동작 방법 및 장치 |
WO2011092011A2 (de) * | 2010-01-30 | 2011-08-04 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Verfahren zur verbesserung des wirkungsgrades bei einem mehrphasigen motor, und motor zur durchführung eines solchen verfahrens |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3523529A1 (de) * | 1985-07-01 | 1987-01-08 | Ifl Ingenieurgesellschaft Fuer | Verfahren und vorrichtung zur verminderung der eisen- und kupferverluste eines induktionsmotors |
WO1995002920A1 (en) * | 1993-07-15 | 1995-01-26 | Econelectric Of North America, Inc. | Efficient control system for electric motors |
US5473241A (en) * | 1994-07-26 | 1995-12-05 | Allen-Bradley Company, Inc. | Method and apparatus for RMS measurements in induction motor without sampling |
US5841264A (en) * | 1994-06-22 | 1998-11-24 | Claude Caen | Method of stepwise voltage control for supplying an induction motor |
-
2000
- 2000-03-01 DE DE10009861A patent/DE10009861A1/de not_active Withdrawn
-
2001
- 2001-02-28 AU AU40661/01A patent/AU4066101A/en not_active Abandoned
- 2001-02-28 WO PCT/EP2001/002241 patent/WO2001065678A1/de not_active Application Discontinuation
- 2001-02-28 EP EP01911705A patent/EP1269621A1/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3523529A1 (de) * | 1985-07-01 | 1987-01-08 | Ifl Ingenieurgesellschaft Fuer | Verfahren und vorrichtung zur verminderung der eisen- und kupferverluste eines induktionsmotors |
WO1995002920A1 (en) * | 1993-07-15 | 1995-01-26 | Econelectric Of North America, Inc. | Efficient control system for electric motors |
US5841264A (en) * | 1994-06-22 | 1998-11-24 | Claude Caen | Method of stepwise voltage control for supplying an induction motor |
US5473241A (en) * | 1994-07-26 | 1995-12-05 | Allen-Bradley Company, Inc. | Method and apparatus for RMS measurements in induction motor without sampling |
Also Published As
Publication number | Publication date |
---|---|
AU4066101A (en) | 2001-09-12 |
DE10009861A1 (de) | 2001-09-13 |
EP1269621A1 (de) | 2003-01-02 |
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