WO2004070402A1 - 電気設備の高調波診断方法 - Google Patents
電気設備の高調波診断方法 Download PDFInfo
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- WO2004070402A1 WO2004070402A1 PCT/JP2004/001154 JP2004001154W WO2004070402A1 WO 2004070402 A1 WO2004070402 A1 WO 2004070402A1 JP 2004001154 W JP2004001154 W JP 2004001154W WO 2004070402 A1 WO2004070402 A1 WO 2004070402A1
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- WIPO (PCT)
- Prior art keywords
- harmonic
- deterioration
- harmonics
- motor
- current
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000006866 deterioration Effects 0.000 claims abstract description 64
- 238000003745 diagnosis Methods 0.000 claims abstract description 38
- 230000005856 abnormality Effects 0.000 claims description 20
- 238000002405 diagnostic procedure Methods 0.000 claims description 9
- 230000002950 deficient Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 16
- 230000001186 cumulative effect Effects 0.000 description 10
- 238000009499 grossing Methods 0.000 description 10
- 238000007689 inspection Methods 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 238000005311 autocorrelation function Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012847 principal component analysis method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000011000 absolute method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000000491 multivariate analysis Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000513 principal component analysis Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
Definitions
- the present invention belongs to the technical field related to electrical equipment diagnosis, and relates to a method for diagnosing harmonics of electrical equipment for an electric motor and an impeller.
- the purpose of the diagnosis of abnormalities and deterioration of electrical equipment is as follows. Improvement of operation rate, reduction of maintenance cost such as material cost and personnel cost, reduction of cost by extending replacement cycle and reduction of inspection and maintenance, prevention of trouble, improvement of safety, improvement of reliability, improvement of productivity, improvement of quality And the like.
- Methods for diagnosing motor abnormalities and deterioration include (1) vibration method, (2) acoustic method, (3) temperature method, (4) torque (strain) method, (5) current method, (6) waveform method, etc. There is a force The torsion method is the most commonly used of these methods, so the vibration method is described here.
- Other diagnostic methods have already been described in patents (Japanese Patent Application No. 2000-386603, Japanese Patent Application No. 2001-265949, Japanese Patent Application No. 2001-358718, Japanese Patent Application No. 2003-030807) filed by the present inventors. Omitted.
- Vibration method is a simple diagnosis that determines the rotational mechanical vibration of the electric motor or the load equipment including the electric motor by installing an electrodynamic type or piezoelectric type or vibration type vibration pickup as close as possible to the source of the vibration. And precise diagnosis to identify the cause and location of abnormalities and deterioration by frequency analysis of vibration. However, all of these diagnoses are limited to mechanical elements such as bearings and rotating shafts.
- JIS standards JIS standards
- VDI standards standards of the German Technical Association
- a simple diagnosis determines that there is an abnormality, a detailed diagnosis is required to identify the cause and location.
- the vibration signals generated by rotating machinery are complex, and there are few simple vibrations. Obtain meaningful information from among them and abnormal
- the frequency analysis method is most widely used to accurately determine the presence or absence of a signal. By analyzing the frequency of the vibration signal, it is possible to identify the cause and location of the abnormality.
- the relationship between the cause of the abnormality and the frequency of occurrence is obtained by accumulating past data over a long period of time and is not accurate.
- Inverters have many features, such as energy savings, improved productivity, and improved operability, and have greatly contributed to the high technology of various industrial machines. Inverters are now indispensable equipment for power equipment, and their production is increasing year by year. The production volume of industrial inverters in Japan in fiscal 1999 was produced by the Ministry of International Trade and Industry (currently According to production dynamics statistics, it exceeds 1.8 million units (equivalent amount: approx. 100 billion yen).
- the impeller is composed of electronic components such as ICs, resistors, capacitors, and transistors, as well as a number of components such as cooling fans and relays. These components cannot be used forever, and their service life and service life are greatly affected by the environment in which they are used. The service life is doubled for every 10 ° C decrease in temperature.
- JMA Joint Electrical Manufacturers' Association
- inverters for abnormality and deterioration diagnosis in the guidebook for “Regular inspection of general-purpose impellers” in order to prevent traps.
- the vibration method is most widely used for diagnosis of motor and impeller abnormalities and deterioration, but since the mounting of the pickup is related to the accuracy, it must be fixed near the vibration source. Diagnosis of abnormal and deteriorated parts is performed by bearing This diagnostic method is limited to mechanical components such as the spindle, and it takes a long time to measure, and the cost of diagnosis including the measuring device is high. Therefore, this diagnostic method is mainly important for relatively large machines. Although the description of other diagnostic methods for motors is omitted, none of them can identify the cause and location of abnormalities and deterioration, as in the vibration method. Extremely expensive.
- inverter in order to identify the cause and location of the faults and deterioration, the inverter is stopped or paused and disassembled. It has to be performed, it is extremely troublesome, takes time, and costs for diagnosis are high.
- harmonic diagnosis methods by the present inventor are based on the rated capacity of motors and inverters, power impedance and load factor, the parallel equivalent capacity of loads other than the equipment concerned, the working voltage, and the type of harmonic countermeasures. It is an absolute method of calculating by grasping in advance, etc., and it is not always a simple method, and it takes time to diagnose. Furthermore, the relationship between the inferior place, that is, the inferior place and the harmonic was not clear. '
- the harmonic diagnostic method for electric equipment for an electric motor and an inverter according to the present invention is performed as follows in order to solve the problem of the harmonic diagnostic based on the absolute method by the inventor.
- a deterioration diagnosis method for determining an abnormality of the motor inverter from a current harmonic flowing through the motor inverter constituting the electric equipment, the harmonic content of each order of the current harmonic is adjusted to a predetermined order.
- the method for diagnosing harmonics of electrical equipment according to the present invention is performed by measuring current harmonics flowing through a motor and an inverter, but does not depend on the capacity of the motor and the inverter.
- This is a very simple diagnostic method that is not related to the parallel equivalent capacity of the loads other than the equipment, the working voltage, and the type of harmonic countermeasures.
- the relationship between the deteriorated part of the motor dimmer and harmonics was clarified by using the principal component analysis method. Since it is possible to classify the degree of deterioration based on this, the harmonic diagnostic method of the present invention is extremely practical and has the effect of being widely used in industrial society.
- FIG. 1 is a block diagram related to the inverter.
- FIG. 2 is an explanatory diagram of harmonic generation.
- 3A to 3H show an example of an oscillating current waveform and an autocorrelation function for the example.
- 'FIG. 4 is a flowchart for diagnosing the electric motor.
- FIGS. 5A to 5C are flowcharts of the diagnosis of the inverter. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram of an inverter. 1 is a three-phase AC power supply, and input power I 7 flows into the converter section 4 of the AC-AC converter 3 that controls the motor 2 c 5 is a smoothing capacitor, 6 is an inverter section, which is controlled by the control section 7 and the drive section 8 Output power 2 'is controlled.
- the control section 7 and the drive section 8 are a control board and a drive board on which electronic components such as ICs, resistors, capacitors, and transistors are mounted.
- the input current and the motor current (output current) have waveforms as shown in FIG.
- the reason why the input current of the AC-AC converter 3 becomes as shown in FIG. 1 is that the full-wave rectification is performed by the comparator unit 4 and then the smoothing capacitor 5 is provided. This phenomenon will be described below. .
- Figure 2 is an explanatory diagram of harmonic generation using a single phase as a sample.
- Three-phase AC power supply Because the smoothing capacitor 5 shown in Fig. 1 is used to convert the power to DC power, a pulse-like current flows through this capacitor 5 only during charging as shown in Fig. 2.
- ⁇ is the pulse width and ⁇ is its height.
- harmonics are generated because the current flows between the AC power supply and the DC power supply are different.
- Equation 1 is the magnetomotive force at a distance of ⁇ (electrical angle) on the circumference from the center of the magnetomotive force of the rotor, 4 is a constant, and I u , I v , and I w are the U phase, V phase,
- the effective value of the W-phase current, ⁇ is the angular velocity expressed as 2 ⁇ / (rad / s), where t is the frequency, and t is the time. Therefore, the combined magnetomotive force F considering the nth harmonic is as follows.
- Equation 2 shows the following.
- y ( x ) 0 because the smoothing capacitor 5 is ideal, and in the ideal case, no pulse current due to the charging current flows.
- the motor is designed so that it contains no harmonic components in the magnetomotive force, so that it is designed to contain no harmonics. Waves are generated. It is well known that an inverter generates harmonics.
- the inferior part of the electric motor can be roughly classified into a mechanical element part such as a bearing and a rotating shaft and an electric element part such as a stator winding.
- the motor current contains an irregular vibration component.
- this includes regular harmonic components. Therefore, to extract only the essential harmonic components from the random irregular current waveform, the autocorrelation function R ( ⁇ ) can be obtained as in the following equation.
- Figures 3A, 3B, 3C, and 3D are examples of random current waveforms from which the fundamental wave component has been removed, and the autocorrelation functions for each are shown in Figures 3E, 3F, 3G, and 3H.
- the smoothing capacitor 5 in Fig. 1 was described above, but if the other power elements (converter 4 and impeller 6), control 7 and drive 8 deteriorate, the output of Fig. 1
- the harmonic component increases in the current in power 2 'and shows a unique value.
- the inventor has found that poor inverter performance and motor deterioration are related to a plurality of specific harmonics. Next, this deterioration determination will be described.
- FIG. 4 is a flowchart for diagnosing the electric motor.
- step S10 the total distortion rate (THD) of harmonics included in the current in the output power 2 'in FIG. 1 is obtained.
- the detection of the current harmonic may be performed by using a well-known device such as a clamp type measuring device or a non-contact type electromagnetic field measuring device using a search coil.
- the harmonic order for calculating the total distortion rate is, for example, the second to the 40th order.
- Step SI 1 calculates the exponent, and calculates the exponent value (TH k ) by dividing the harmonic content of each order by the total distortion rate obtained in step S 10.
- the step of performing the deterioration determination is S12.
- CH k is a criterion value of the K-th harmonic described later, and is compared with TH k obtained in step S11.
- FIGS. 5A to 5C show flowcharts for diagnosis of the impeller.
- Fig. 5A shows a method for diagnosing the smoothing capacitor 5 in Fig. 1 and measures the current harmonic of the input power 1 'in Fig. 1 to judge the deterioration.
- Steps P100, P111, and P112 are the same as the contents calculated in steps S10, S11, and S12 of FIG.
- FIG. 5B is a flow for diagnosing the converter section 4, the inverter section 6, and the control section 7 in FIG. 1.
- the current harmonics of the output power 2 in FIG. 1 are measured to determine deterioration.
- Steps P200, P211 and P212 are the same as the contents calculated in steps P100, P111 and P112 of FIG. 5A.
- FIG. 5C is a flow for diagnosing the drive unit 8 in FIG. 1, in which a current harmonic of the output power 2 ′ in FIG. 1 is measured to determine deterioration.
- step P20 the 38th harmonic content is determined, and the drive board is diagnosed (step P201 ').
- Diagnosis of the drive substrate and 38th determination harmonics reference value CH k l. 0 (Step P 202 ') its to step 203' the CHk a 38th order harmonic content in (H 38) And judge the quality of the drive board.
- the judgment reference value CH k shown in FIGS. 4 and 5 A, B, and C is obtained as follows.
- K is the Kth harmonic and Ck is the diagnostic calculated value of the Kth harmonic.
- the degree of deterioration of motors and inverters (hereinafter referred to as equipment) is classified into “normal”, “needs attention” and “defective” to make a qualitative judgment.
- B as “Attention” indicates a slight inferiority depending on the degree of deterioration of the equipment. No deterioration) Bl, moderate deterioration (operating for about 3 months but deterioration requiring trend management) B2, severe deterioration (part replacement due to concerns about equipment trouble) And deterioration requiring preparation for repair) are classified as B3.
- the above inspection period should be used as a guide only.
- A, B1, B2, B3, and C are divided by multiplying the above-described determination reference value by a weight coefficient, and this coefficient will be described in an embodiment to be described later.
- a multivariate analysis method is effective for analyzing the relationship between the current harmonics and the degraded parts of the equipment, and this will be described below.
- the current harmonics on the input side of the impeller were measured and two main components were obtained. The results were the fifth harmonic (62) and the seventh harmonic (36), and the cumulative contribution was 98%.
- the second harmonic (3), the third harmonic (16), the fourth harmonic (2), and the fifth harmonic 13
- the harmonic (6) becomes the 38th harmonic (7), and the cumulative contribution ratio is 99%.
- Inferiority of drive board (mainly deterioration of capacitor). Measure the current harmonic at the output of the inverter.
- the number of principal components may be one, which is the 38th harmonic and the contribution ratio is 89%.
- the current harmonics on the input side of the motor are used in the case of motor-independent operation without inverter control, and the output side of the inverter is used in the case of the motor driven by the imperter (input to the motor).
- the smoothing capacitor is a harmonic on the inverter input side, and all others are harmonics of the inverter output measurement.
- the diagnosis calculation value and the K-th harmonic function necessary for determining the deterioration of the motor inverter will be described with reference to specific examples as follows. It is not limited to the example. H k shown below is the Kth harmonic content.
- F (N c ) takes the following value.
- Tables 3 and 4 show an example in which the degraded parts of the electrical equipment and the degrees of deterioration (A, B1, B2, B3, C) described in the embodiment of the invention described above are summarized.
- Body 1 C 3 Xf (M 3 ) (A) XI.3 (Bl) XL 3 (B2) XL 2 (B3) or more insulation of stator winding
- Air gap C 6 Xf (M 5 ) (A) XI.3 (Bl) X1.3 (B2) XI.2 (B3) or more Non-uniform (with dust)
- C k is the diagnostic calculated value of the K th harmonic
- f (N s , N c , N p , N d ) is the K th harmonic function
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Inverter Devices (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Ac Motors In General (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004570946A JP3661155B2 (ja) | 2003-02-07 | 2004-02-04 | 電気設備の高調波診断方法 |
EP04708066A EP1591795A4 (en) | 2003-02-07 | 2004-02-04 | METHOD FOR DIAGNOSING ELECTRICAL INSTALLATION THROUGH HARMONICS |
US10/525,227 US7275003B2 (en) | 2003-02-07 | 2004-02-04 | Harmonic diagnosing method for electric facility |
HK06109826.5A HK1087778A1 (en) | 2003-02-07 | 2006-09-04 | Method of harmonic diagnosis for electric equipment |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003030807 | 2003-02-07 | ||
JP2003-30807 | 2003-02-07 | ||
JP2003036362 | 2003-02-14 | ||
JP2003-36362 | 2003-02-14 |
Publications (1)
Publication Number | Publication Date |
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WO2004070402A1 true WO2004070402A1 (ja) | 2004-08-19 |
Family
ID=32852687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/001154 WO2004070402A1 (ja) | 2003-02-07 | 2004-02-04 | 電気設備の高調波診断方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7275003B2 (ja) |
EP (1) | EP1591795A4 (ja) |
JP (1) | JP3661155B2 (ja) |
KR (1) | KR100616272B1 (ja) |
HK (1) | HK1087778A1 (ja) |
WO (1) | WO2004070402A1 (ja) |
Cited By (11)
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JP2008236876A (ja) * | 2007-03-19 | 2008-10-02 | Toshiba Corp | 電力品質評価システム |
JP2015173543A (ja) * | 2014-03-11 | 2015-10-01 | 株式会社東芝 | 電力負荷推定装置、電力負荷推定システム、電力負荷推定方法及び電力負荷推定プログラム |
JP2015215275A (ja) * | 2014-05-13 | 2015-12-03 | 株式会社日立製作所 | 劣化診断システム |
WO2019116471A1 (ja) * | 2017-12-13 | 2019-06-20 | 三菱電機株式会社 | 電力変換装置および空気調和機 |
JP2020153743A (ja) * | 2019-03-19 | 2020-09-24 | 株式会社戸上電機製作所 | 地絡要因推定装置、データ生成装置、地絡要因推定方法、データ生成方法及び地絡継電器 |
JP6800352B1 (ja) * | 2019-07-24 | 2020-12-16 | 東芝三菱電機産業システム株式会社 | キャパシタ診断装置及びキャパシタ診断方法 |
US10883895B2 (en) | 2016-12-15 | 2021-01-05 | Mitsubishi Electric Corporation | Abnormality diagnostic device for power transmission mechanism and abnormality diagnostic method for power transmission mechanism |
JP2021052572A (ja) * | 2019-09-20 | 2021-04-01 | 富士電機株式会社 | モデル生成装置、電力変換装置及び電力制御システム |
WO2023073870A1 (ja) * | 2021-10-28 | 2023-05-04 | 三菱電機株式会社 | 電力変換装置、モータ駆動装置および冷凍サイクル適用機器 |
WO2023084600A1 (ja) * | 2021-11-09 | 2023-05-19 | 三菱電機株式会社 | 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 |
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US7847579B2 (en) * | 2007-06-28 | 2010-12-07 | Gm Global Technology Operations, Inc. | Systems and methods to evaluate permanent magnet motors |
JP4877397B2 (ja) * | 2010-01-22 | 2012-02-15 | 株式会社デンソー | 電流センサの異常診断装置、およびセンサの異常診断装置 |
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US9791343B2 (en) * | 2015-02-12 | 2017-10-17 | General Electric Company | Methods and systems to derive engine component health using total harmonic distortion in a knock sensor signal |
CN107845999A (zh) * | 2017-11-30 | 2018-03-27 | 中电科芜湖钻石飞机制造有限公司 | 一种基于电流总谐波系数的电机故障检测***及方法 |
CN111856171A (zh) * | 2019-04-24 | 2020-10-30 | 中矿龙科能源科技(北京)股份有限公司 | 基于谐波法的变频器和电力电容器故障诊断*** |
CN114026776B (zh) * | 2019-07-05 | 2022-07-05 | 三菱电机株式会社 | 异常诊断***及异常诊断方法 |
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2004
- 2004-02-04 KR KR1020047005096A patent/KR100616272B1/ko active IP Right Grant
- 2004-02-04 US US10/525,227 patent/US7275003B2/en not_active Expired - Lifetime
- 2004-02-04 EP EP04708066A patent/EP1591795A4/en not_active Withdrawn
- 2004-02-04 JP JP2004570946A patent/JP3661155B2/ja not_active Expired - Lifetime
- 2004-02-04 WO PCT/JP2004/001154 patent/WO2004070402A1/ja active IP Right Grant
-
2006
- 2006-09-04 HK HK06109826.5A patent/HK1087778A1/xx not_active IP Right Cessation
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JPH1183686A (ja) * | 1997-09-01 | 1999-03-26 | Nippon Steel Corp | 機械設備の異常診断方法およびその装置 |
JP2002189064A (ja) * | 2000-12-20 | 2002-07-05 | Ko Gijutsu Kenkyusho:Kk | 電気機器設備の異常診断方法 |
JP2003075516A (ja) * | 2001-09-03 | 2003-03-12 | Ko Gijutsu Kenkyusho:Kk | 電気機器の劣化診断法 |
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Cited By (15)
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JP2008236876A (ja) * | 2007-03-19 | 2008-10-02 | Toshiba Corp | 電力品質評価システム |
JP2015173543A (ja) * | 2014-03-11 | 2015-10-01 | 株式会社東芝 | 電力負荷推定装置、電力負荷推定システム、電力負荷推定方法及び電力負荷推定プログラム |
JP2015215275A (ja) * | 2014-05-13 | 2015-12-03 | 株式会社日立製作所 | 劣化診断システム |
US10883895B2 (en) | 2016-12-15 | 2021-01-05 | Mitsubishi Electric Corporation | Abnormality diagnostic device for power transmission mechanism and abnormality diagnostic method for power transmission mechanism |
JP7049363B2 (ja) | 2017-12-13 | 2022-04-06 | 三菱電機株式会社 | 電力変換装置および空気調和機 |
WO2019116471A1 (ja) * | 2017-12-13 | 2019-06-20 | 三菱電機株式会社 | 電力変換装置および空気調和機 |
JPWO2019116471A1 (ja) * | 2017-12-13 | 2020-11-19 | 三菱電機株式会社 | 電力変換装置および空気調和機 |
JP2020153743A (ja) * | 2019-03-19 | 2020-09-24 | 株式会社戸上電機製作所 | 地絡要因推定装置、データ生成装置、地絡要因推定方法、データ生成方法及び地絡継電器 |
JP6800352B1 (ja) * | 2019-07-24 | 2020-12-16 | 東芝三菱電機産業システム株式会社 | キャパシタ診断装置及びキャパシタ診断方法 |
WO2021014604A1 (ja) * | 2019-07-24 | 2021-01-28 | 東芝三菱電機産業システム株式会社 | キャパシタ診断装置及びキャパシタ診断方法 |
JP2021052572A (ja) * | 2019-09-20 | 2021-04-01 | 富士電機株式会社 | モデル生成装置、電力変換装置及び電力制御システム |
JP7363567B2 (ja) | 2019-09-20 | 2023-10-18 | 富士電機株式会社 | モデル生成装置、電力変換装置及び電力制御システム |
WO2023073870A1 (ja) * | 2021-10-28 | 2023-05-04 | 三菱電機株式会社 | 電力変換装置、モータ駆動装置および冷凍サイクル適用機器 |
WO2023084600A1 (ja) * | 2021-11-09 | 2023-05-19 | 三菱電機株式会社 | 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 |
JP7354442B1 (ja) * | 2021-11-25 | 2023-10-02 | 東芝三菱電機産業システム株式会社 | 無停電電源装置 |
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JP3661155B2 (ja) | 2005-06-15 |
EP1591795A1 (en) | 2005-11-02 |
EP1591795A4 (en) | 2011-07-06 |
KR100616272B1 (ko) | 2006-08-28 |
US7275003B2 (en) | 2007-09-25 |
JPWO2004070402A1 (ja) | 2006-05-25 |
KR20050044320A (ko) | 2005-05-12 |
HK1087778A1 (en) | 2006-10-20 |
US20060009932A1 (en) | 2006-01-12 |
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