CN102466538A - Method for detecting load imbalance of variable frequency motor - Google Patents
Method for detecting load imbalance of variable frequency motor Download PDFInfo
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- CN102466538A CN102466538A CN2011100602021A CN201110060202A CN102466538A CN 102466538 A CN102466538 A CN 102466538A CN 2011100602021 A CN2011100602021 A CN 2011100602021A CN 201110060202 A CN201110060202 A CN 201110060202A CN 102466538 A CN102466538 A CN 102466538A
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Abstract
The invention relates to a method for detecting the load imbalance of a variable frequency motor, which comprises the steps of: at first, controlling the variable frequency motor to rotate at a certain speed; then calculating the fluctuate value according to the amplitude of an output signal of a PI (Proportional-Integral) controller of a frequency converter; and calculating the load imbalance OOB (Out of Balance) of the variable frequency motor. In the invention, the load imbalance OOB of the motor is calculated according to fluctuation of the amplitude of output voltage of the PI controller of the frequency converter without detecting current and voltage of the motor by hardware circuits so that the invention has the advantage of low cost. Furthermore, because the product of the sampling period and the number of samples is equal to integral multiple of the rotating period of the load equipment, the invention has the advantage of high detection precision and can be widely applied to the technical fields of frequency converters of white household appliances, industrial frequency converters and the like.
Description
Technical field
Patent of the present invention relates to the detection method of the non-equilibrium state of load, particularly a kind of unbalance detection of variable-frequency motor load.
Background technology
Variable-frequency motor relates to motor and controller thereof.Along with the development of Power Electronic Technique and microcontroller technology, the frequency converter price is more and more lower, and it not only is used in the Industry Control now in a large number, and gets in a large number in the civil equipment, like the variable-frequency washing machine in the white domestic appliances, air-conditioning, refrigerator etc.When the variable-frequency motor laod unbalance, the rotating speed of variable-frequency motor is high more, and the vibration of system and noise will be big more, thereby reduces the serviceable life of equipment, and this situation shows especially outstanding on washing machine.The testing result of the amount of unbalance OOB of variable-frequency motor load can be used for control system motor is carried out rotating speed control, thereby effectively reduces the uneven Oscillation Amplitude that is caused of motor load, prolongs the serviceable life of motor and load, reduces system noise.If variable-frequency motor has the laod unbalance measuring ability, when finding laod unbalance, can perhaps pass through to change the non-equilibrium state of load through the adjustment rotating speed of motor, thereby reduce the vibration and the noise of system.Be that example describes below with the washing machine: accompanying drawing 1a has shown that the clothing in the washing machine drum accumulates in the non-equilibrium state of a side, and accompanying drawing 1b has shown the equally distributed equilibrium state of the clothing in the cylinder.When the laundry machine dehydration high speed rotating, if washing machine is in the clothing shown in the accompanying drawing 1a when accumulating in the non-equilibrium state of a side, cylinder can acutely rock, and produces noise, also exist motor working efficiency low with problem such as the washing machine lost of life.Therefore; Washing machine needs to detect the amount of unbalance of variable-frequency motor load (clothing in the cylinder) before the dehydration high speed rotating; When detecting bigger amount of unbalance; Washing machine need be evenly distributed in the cylinder (shown in accompanying drawing 1b) clothing through adjustment motor speed and action as far as possible, thereby the amount of unbalance that makes motor load can carry out high speed dewatering after less than certain value.
Traditional unbalance detection mainly contains two kinds: 1) based on the unbalance detection of motor speed; 2) based on the unbalance detection of current of electric or power.PI parameter influence based on the controlled device of unbalance detection of motor speed is bigger, and its measuring result error is bigger; Unbalance detection based on current of electric or power needs special current sampling circuit, and its precision receives the influence of current sampling circuit precision.Therefore, how under the prerequisite that does not increase cost, being easy to realize that the imbalance of motor load detects, and improving the uneven precision that detects, is the technical barrier that those skilled in the art is badly in need of solving.
Summary of the invention
The technical matters that the present invention will solve provides the unbalance detection of the variable-frequency motor load that a kind of imbalance that can realize motor load detects.
For solving an above-mentioned difficult problem, invention provides a kind of unbalance detection of variable-frequency motor load, according to the output signal of the PI controller of frequency converter, comes the amount of unbalance OOB (Out Of Balance) of computational load, and this method may further comprise the steps:
S1. control system judges whether the time in the sampling period that uneven OOB detects arrive, if arrive, then gets into S2, otherwise gets into S13;
S2. read the motor load rotating speed, the employing number of times that is used for S3 calculates;
S3. equal the constraint condition calculating sampling times N of integral multiple of the rotation period of motor load by the product in sampling number and sampling period;
S4. read the output signal of PI controller;
S5. calculate the mean value of PI controller output signal;
S6. according to the mean value of S5 and the absolute value of current output signal value signal calculated fluctuation;
S7. the new signal fluctuation accumulated value of signal fluctuation absolute calculation that calculates according to historical signal fluctuation accumulated value and S6;
S8. the sampling number variable adds 1;
S9. judge whether sampling number reaches N,, otherwise get into S13 if reach then get into S10;
S10. calculate the amount of unbalance of motor load according to sampling number N and signal fluctuation accumulated value;
S11. signal fluctuation absolute value accumulated value deducts the data of historical volatility the earliest in the preservation data N time, is used for next unbalanced calculating;
S12. the sampling number variable subtracts 1, guarantees can calculate amount of unbalance again after the sampling next time;
S13. withdraw from.
The output signal of PI controller is in voltage, electric current, the power signal in the unbalance detection of said variable-frequency motor load.When calculating the amount of unbalance OOB of motor load, the product in sampling number and sampling period equals the integral multiple of the rotation period of motor load.
The present invention does not need hardware circuit to detect the electric current and the voltage of motor according to the amount of unbalance OOB of the fluctuation calculating motor load of the output signal of the PI controller of frequency converter, has the low advantage of cost.
Owing to can carry out the detection of laod unbalance according to the multiple output signal of PI controller, thereby have good suitability.
Because the product of sampling period and sampling number equals the integral multiple of the rotation period of load equipment, thereby has the high advantage of accuracy of detection, can be widely used in technical fields such as white domestic appliances frequency converter, industrial frequency transformer.
Description of drawings
For content of the present invention is expressly understood more easily,, the present invention is done further detailed explanation, wherein below according to specific embodiment and combine accompanying drawing
Fig. 1 is that laundry of washing machine evenly distributes and the uneven distribution synoptic diagram.
Fig. 2 is the application system block diagram.
Fig. 3 is a PI controller block diagram.
Fig. 4 is the amount of unbalance OOB testing process figure of variable-frequency motor load.
Embodiment
(embodiment 1)
The application system block diagram is shown in accompanying drawing 2, and it comprises frequency converter, motor and load, and the PI controller is a critical software module of frequency converter.
PI controller block diagram is as shown in Figure 3, and its input signal is the error of target velocity and feedback speed, and it obtains the control voltage of motor through the PI algorithm then, calculates the value of amount of unbalance OOB at last according to following formula 1 and formula 2:
In order to improve the accuracy of detection of amount of unbalance OOB, when carrying out the calculating of formula 1 and formula 2, the product that need satisfy sampling number and sampling period equals the integral multiple of the rotation period of motor load.
Software algorithm of the present invention is shown in accompanying drawing 4, and concrete steps are following:
S1. control system judges whether the time in the sampling period that uneven OOB detects arrive, if arrive, then gets into for the 2nd step, otherwise gets into for the 13rd step;
S2. read the motor load rotating speed, the employing number of times that was used for for the 3rd step calculates;
S3. equal the constraint condition calculating sampling times N of integral multiple of the rotation period of motor load by the product in sampling number and sampling period;
S4. read the output voltage of PI controller;
S5. calculate the average voltage of PI controller output voltage;
S6. according to the average voltage in the 5th step and the absolute value of current voltage calculating fluctuation voltage;
S7. go on foot the new fluctuation voltage accumulated value of fluctuation voltage absolute calculation that calculates according to historical volatility voltage accumulation value and the 6th;
S8. the sampling number variable adds 1;
S9. judge whether sampling number reaches N, go on foot if reach then get into the 10th, otherwise got into for the 13rd step;
S10. calculate the amount of unbalance of motor load according to sampling number N and fluctuation voltage accumulated value;
S11. fluctuation voltage absolute value accumulated value deducts the data of historical volatility the earliest in the preservation data N time, is used for next unbalanced calculating;
S12. the sampling number variable subtracts 1, guarantees can calculate amount of unbalance again after the sampling next time;
S13. withdraw from.
(embodiment 2)
The testing process of present embodiment such as embodiment 1, the PI controller of different is present embodiment is output as current signal, calculates the value of amount of unbalance OOB according to following formula 3 and formula 4.
(embodiment 3)
The testing process of present embodiment such as embodiment 1, the PI controller of different is present embodiment is output as power signal, calculates the value of amount of unbalance OOB according to following formula 5 and formula 6.
The above only is a typical application of the present invention; Should be understood that; For the person of ordinary skill of the art, under the prerequisite that does not break away from principle of the present invention, described software algorithm or software flow are made some changes and retouching; Such as the method for operating that changes signal calculated mean value etc., these changes and retouching also should be regarded as protection scope of the present invention.
Claims (3)
1. the unbalance detection of a variable-frequency motor load is characterized in that the output signal according to the PI controller of frequency converter, comes the amount of unbalance OOB of computational load, may further comprise the steps:
S1. control system judges whether the time in the sampling period that uneven OOB detects arrive, if arrive, then gets into S2, otherwise gets into S13;
S2. read the motor load rotating speed, the employing number of times that is used for S3 calculates;
S3. equal the constraint condition calculating sampling times N of integral multiple of the rotation period of motor load by the product in sampling number and sampling period;
S4. read the output signal of PI controller;
S5. calculate the mean value of PI controller output signal;
S6. according to the mean value of S5 and the absolute value of current output signal value signal calculated fluctuation;
S7. the new signal fluctuation accumulated value of signal fluctuation absolute calculation that calculates according to historical signal fluctuation accumulated value and S6;
S8. the sampling number variable adds 1;
S9. judge whether sampling number reaches N,, otherwise get into S13 if reach then get into S10;
S10. calculate the amount of unbalance of motor load according to sampling number N and signal fluctuation accumulated value;
S11. signal fluctuation absolute value accumulated value deducts the data of historical volatility the earliest in the preservation data N time, is used for next unbalanced calculating;
S12. the sampling number variable subtracts 1, guarantees can calculate amount of unbalance again after the sampling next time;
S13. withdraw from.
2. the unbalance detection of a kind of variable-frequency motor load according to claim 1 is characterized in that: the output signal of said PI controller is in voltage, electric current, the power signal.
3. the unbalance detection of a kind of variable-frequency motor load according to claim 1 is characterized in that: when calculating the amount of unbalance OOB of motor load, the product in sampling number and sampling period equals the integral multiple of the rotation period of motor load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100602021A CN102466538A (en) | 2011-03-14 | 2011-03-14 | Method for detecting load imbalance of variable frequency motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100602021A CN102466538A (en) | 2011-03-14 | 2011-03-14 | Method for detecting load imbalance of variable frequency motor |
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| CN2011100602021A Pending CN102466538A (en) | 2011-03-14 | 2011-03-14 | Method for detecting load imbalance of variable frequency motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643473A (en) * | 2017-09-30 | 2018-01-30 | 广东威灵电机制造有限公司 | The stator winding symmetry detection methods and detection means of motor |
| CN109358285A (en) * | 2018-10-30 | 2019-02-19 | 钟娅 | A kind of permanent-magnet brushless DC electric machine laod unbalance detection method |
| CN109820462A (en) * | 2019-03-28 | 2019-05-31 | 佛山市百斯特电器科技有限公司 | A kind of method and dish-washing machine controlling motor |
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| CN1350166A (en) * | 2000-10-24 | 2002-05-22 | 江苏春兰洗涤机械有限公司 | Unbalanced roll mass testing method for roll-type washing machine |
| CN2773130Y (en) * | 2003-04-28 | 2006-04-19 | 美国艾默生电气公司 | System for inspecting load out off balance of washer |
| CN1924154A (en) * | 2005-08-31 | 2007-03-07 | 三星电子株式会社 | Unbalance detection method and washing machine using the same |
| CN1928579A (en) * | 2005-09-06 | 2007-03-14 | 海尔集团公司 | Electric motor load judgment method |
| CN101419112A (en) * | 2007-10-24 | 2009-04-29 | 通用电气公司 | Method and apparatus for determining an imbalance condition in an appliance |
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- 2011-03-14 CN CN2011100602021A patent/CN102466538A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350166A (en) * | 2000-10-24 | 2002-05-22 | 江苏春兰洗涤机械有限公司 | Unbalanced roll mass testing method for roll-type washing machine |
| CN2773130Y (en) * | 2003-04-28 | 2006-04-19 | 美国艾默生电气公司 | System for inspecting load out off balance of washer |
| CN1924154A (en) * | 2005-08-31 | 2007-03-07 | 三星电子株式会社 | Unbalance detection method and washing machine using the same |
| CN1928579A (en) * | 2005-09-06 | 2007-03-14 | 海尔集团公司 | Electric motor load judgment method |
| CN101419112A (en) * | 2007-10-24 | 2009-04-29 | 通用电气公司 | Method and apparatus for determining an imbalance condition in an appliance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643473A (en) * | 2017-09-30 | 2018-01-30 | 广东威灵电机制造有限公司 | The stator winding symmetry detection methods and detection means of motor |
| CN109358285A (en) * | 2018-10-30 | 2019-02-19 | 钟娅 | A kind of permanent-magnet brushless DC electric machine laod unbalance detection method |
| CN109358285B (en) * | 2018-10-30 | 2021-11-05 | 铜仁职业技术学院 | Method for detecting load imbalance of permanent magnet brushless direct current motor |
| CN109820462A (en) * | 2019-03-28 | 2019-05-31 | 佛山市百斯特电器科技有限公司 | A kind of method and dish-washing machine controlling motor |
| CN109820462B (en) * | 2019-03-28 | 2021-06-11 | 佛山市百斯特电器科技有限公司 | Method for controlling motor and dish-washing machine |
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Application publication date: 20120523 |