CN105301413A - Service life evaluation method for bus electrolytic capacitor of motor driver - Google Patents
Service life evaluation method for bus electrolytic capacitor of motor driver Download PDFInfo
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- CN105301413A CN105301413A CN201510812903.4A CN201510812903A CN105301413A CN 105301413 A CN105301413 A CN 105301413A CN 201510812903 A CN201510812903 A CN 201510812903A CN 105301413 A CN105301413 A CN 105301413A
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Abstract
The invention provides a service life evaluation method for bus electrolytic capacitors of a motor driver. The method comprises the steps: testing the core temperature of each bus electrolytic capacitor of a driver and the working environment temperature by means of a temperature-sensitive technology, selecting the highest core temperature rise [Delta]T among the electrolytic capacitors, and calculating the core temperature T2 of the electrolytic capacitors when the driver is running in a condition with the upper limit environment temperature. The service life of the bus electrolytic capacitors is calculated according to the difference between the highest allowed core temperature and the T2 as well as correction coefficients of bus voltages, so the service life of the driver can be evaluated. According to the method, the influence brought by the difference between an actual temperature upper limit for a driver and a test environment temperature, the influence of bus voltage when the driver is in use and the influence of uneven temperature rises among bus electrolytic capacitors are all taken into consideration. Aspects are comprehensively considered by the method, and an evaluation result is reliable.
Description
Technical field
The present invention relates to a kind of motor driver bus electrolytic capacitor life test appraisal procedure, for assessment of the driver life-span.
Background technology
Along with the progress of automatic technology and the development of industrial automation, servo, frequency conversion system are widely used in the industries such as manufacture, medical treatment, amusement, service, to provide for the purpose of position control accurately and fast, be the requisite automation equipment in advanced manufacturing technology field, its technical merit and level of application are the important symbols of a National Industrial robotization.
Along with servo, the applying of frequency conversion system, also more and more higher to the demand of its performance, comprise shorter positioning time, more excellent control stationarity, more intelligent automatic-adjusting technique and higher reliability.Especially at driver dragging motor, the occasion of long term frequent start and stop, rotating fast, bringing onto load VTOL (vertical take off and landing), as robot, mechanical arm, rotating tower punch etc. application, proposes more harsh requirement to the Primary Component type selecting of driver.Therefore, the Primary Component of driver how design selection, how to verify that its design meets the life requirements of whole system, day by day become the key problem of driver design.
Driver dragging motor, be normally operated in the occasion of frequent start-stop, rotating fast, bringing onto load VTOL (vertical take off and landing), as robot, mechanical arm, rotating tower punch etc. application, the busbar voltage fluctuation of driver is larger, bus capacitor ripple current is larger, therefore, the life-span of bus capacitor determines the life-span of whole driver.
At present for the method for driver bus electrolytic capacitor life appraisal, one is ripple current method of testing, by testing the environment temperature of electrochemical capacitor, ripple current, actually applying the life-span that voltage calculates electric capacity, but its computation process is more complicated, result of calculation poor accuracy, be suitable only for initial stage design selection, can not as engineering verification means.Another kind is thermal resistance calculation method, the life-span of electric capacity is calculated by the ripple current under the ESR of electrochemical capacitor, different frequency, the acquisition of its key parameter ESR needs mass data to accumulate support, otherwise result of calculation differs comparatively large with reality, and the method is only suitable for initial stage Selection and Design.
Summary of the invention
The problem that the present invention solves is: overcome the defect that prior art exists, propose motor driver bus electrolytic capacitor lifetime estimation method, the bus electrolytic capacitor of temperature-sensitive technology Measurement accuracy driver is adopted to hold core temperature rise, utilize on this basis and hold the life-span that core Temperature Rise Model calculates bus electrolytic capacitor, and then reach the object to driver life appraisal.
Technical scheme of the present invention is:
Motor driver bus electrolytic capacitor lifetime estimation method, the steps include:
The first, at all built-in thermistor of the appearance in-core of the electrochemical capacitor of each bus of driver, resistance signal is drawn by wire, is connected to multi way temperature tester.
The second, driver dragging motor, this n-body simulation n of driving mechanical actual condition runs without interruption for a long time; Every the time interval of a setting, read appearance core temperature under each electrochemical capacitor duty and operating ambient temperature with multi way temperature tester; Meanwhile, with oscillograph test driver busbar voltage waveform, get busbar voltage equivalence effective value (the actual use voltage of electrochemical capacitor) U
a.
Calculate each electrochemical capacitor and hold core temperature rise △ T
i:
△ T
iappearance core temperature-operating ambient temperature under=bus electrolytic capacitor duty.
3rd, select appearance core temperature rise △ T the highest in all electrochemical capacitors, select drive working environment ceiling temperature, when calculating that driver works under environment upper limit temperature case, electrochemical capacitor holds core temperature T
2:
T
2=drive operation environment ceiling temperature+△ T.
4th, based on appearance core temperature rise life-span theoretical model, appearance core temperature and busbar voltage equivalence effective value calculate the assessment life-span of electrochemical capacitor to utilize electrochemical capacitor to calculate:
K
v＝(U
r/U
a)
2.5(U
a≤0.6U
r,U
a＝0.6U
r)
Wherein: T
1: under environment upper limit temperature case, electrochemical capacitor holds core maximum permissible temperature (DEG C);
L
0: electrochemical capacitor specified serviceable life is (hour h);
L
x: assessment life-span of electrochemical capacitor is (hour h);
U
r: the specified use voltage (V) of electrochemical capacitor.
Method of testing of the present invention, fully take into account the routine application operating mode of servo, frequency conversion system---frequent start-stop, rotating fast, bringing onto load VTOL (vertical take off and landing), the busbar voltage fluctuation of driver is larger, bus electrolytic capacitor ripple current is comparatively large, and the life-span of bus electrolytic capacitor determines the life-span of whole driver.Especially when driver applications is in occasions such as robot, mechanical arm, rotating tower punchs, this method of testing has directive significance more.
Method of testing of the present invention, it is for the life appraisal of driver Primary Component electrochemical capacitor, adopt and hold core temperature rise method of testing, for ripple current method of testing and thermal resistance calculation method, although method of testing is complicated, its assessment result accurate and effective more, computation process is simple simultaneously, the error of calculation is little, is more suitable for practical engineering application, whether can meet effective checking means of driver bulk life time requirement as electric capacity type selecting.
Method of testing of the present invention, consider the uneven impact brought of temperature rise between impact that the driver actual serviceability temperature upper limit and test environment temperature contrast bring, the actual impact that busbar voltage height brings when using and bus electrolytic capacitor, consider that assessment result is reliable comprehensively.
Accompanying drawing explanation
Fig. 1 robot motor, servo-driver and multichannel temperature measurement instrument connect block diagram.
Embodiment
For specifically setting forth technical scheme of the present invention, technique effect and feature, below with reference to embodiments of the invention accompanying drawing, carry out more clear, detailed description with concrete example to the present invention.
Embodiment: tested object is the servo-driver in 180Kg4 axle robot system.
During robot body simulation actual condition, 2 axle 7.5Kw servo-driver dragging motors carry out quick forward, counter motion with the rotating speed of 3500rpm, relative to other axle, the load inertia of 2 axles is maximum, the motor positive and inverse frequency is the highest, and motor range is the longest, and therefore the DC bus-bar voltage fluctuation of 2 axle servo-drivers is maximum, the ripple current of bus electrolytic capacitor is maximum, and 2 axle servo-driver life-spans are the shortest.Therefore this concrete case study on implementation is assessed for 2 axle servo-drivers.
As shown in Figure 1, comprise four axle robot dedicated servo drivers, servomotor, multichannel temperature measurement instrument, wherein servo-driver comprises rectification part, bus support component and inversion parts.Bus support component is made up of bus electrolytic capacitor, in the conversion of servo-driver AC-DC-AC, play energy storage support function.In this example, the bus support component of 7.5KW servo-driver is 6 820Uf/400V alminium electrolytic condensers; 6 electrochemical capacitors hold in-core and put thermistor, and its resistance signal is drawn by wire, and wire is connected to multichannel temperature measurement instrument, for measuring the appearance core temperature of electrochemical capacitor in real time.
Servo-driver carrying machine people motor, runs according to robot actual condition, every 6 temperature readings of 30 minutes record multichannel temperature measurement instrument display, and records environment temperature, makes form.The thermograph form that table 1 runs without interruption 5 hours for robot.
The assessment life-span of electrochemical capacitor:
K
v＝(U
r/U
a)
2.5(U
a≤0.6U
r,U
a＝0.6U
r)
In this example, according to electrochemical capacitor databook, T
1=95 DEG C, L
0=5000h, U
r=400V.As can be seen from Table 1, the highest in electrochemical capacitor appearance core temperature rise △ T=17.3 DEG C.By robot environment for use upper temperature limit 40 DEG C calculating, when driver works under environment upper limit temperature case, the electrochemical capacitor of reckoning holds core temperature T
2=57.3 DEG C.In robot operational process, record the equivalent effective value U of busbar voltage with oscillograph
afor 375V.
Above data are substituted into formula (1), obtains the assessment life-span L of electrochemical capacitor
x=9 years, namely the minimum assessment life-span of 2 axle servo-driver bus electrolytic capacitors was 9 years.And in the robot operating mode of this example, the life-span of servo-driver depends primarily on the life-span of bus electrolytic capacitor, and the bus capacitor life-span of 2 axle drivers is shorter relative to other axle, and then draw in whole robot system, the assessment life-span of servo-driver is at least 9 years.
Claims (1)
1. a motor driver bus electrolytic capacitor lifetime estimation method, the steps include:
Step one, at all built-in thermistor of the appearance in-core of the electrochemical capacitor of each bus of driver, resistance signal is drawn by wire, is connected to multi way temperature tester;
Step 2, driver dragging motor, this n-body simulation n of driving mechanical actual condition runs without interruption for a long time; Every the time interval of a setting, read appearance core temperature under each electrochemical capacitor duty and operating ambient temperature with multi way temperature tester; Meanwhile, with oscillograph test driver busbar voltage waveform, get busbar voltage equivalence effective value U
a;
Calculate each electrochemical capacitor and hold core temperature rise △ T
i,
△ T
iappearance core temperature-operating ambient temperature under=bus electrolytic capacitor duty;
Step 3, selects appearance core temperature rise △ T the highest in all electrochemical capacitors, select drive working environment ceiling temperature, and when calculating that driver works under environment upper limit temperature case, electrochemical capacitor holds core temperature T
2:
T
2=drive operation environment ceiling temperature+△ T;
Step 4, calculates the assessment life-span of electrochemical capacitor:
Wherein: K
v=(U
r/ U
a)
2.5(U
a≤ 0.6U
r, U
a=0.6U
r)
T
1: under environment upper limit temperature case, electrochemical capacitor holds core maximum permissible temperature;
L
0: electrochemical capacitor specified serviceable life;
L
x: the assessment life-span of electrochemical capacitor;
U
r: the specified use voltage (V) of electrochemical capacitor;
K
v: the correction factor of busbar voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510812903.4A CN105301413B (en) | 2015-11-20 | 2015-11-20 | Motor driver bus electrolytic capacitor lifetime estimation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510812903.4A CN105301413B (en) | 2015-11-20 | 2015-11-20 | Motor driver bus electrolytic capacitor lifetime estimation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105301413A true CN105301413A (en) | 2016-02-03 |
| CN105301413B CN105301413B (en) | 2018-05-04 |
Family
ID=55198910
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|---|---|---|---|
| CN201510812903.4A Active CN105301413B (en) | 2015-11-20 | 2015-11-20 | Motor driver bus electrolytic capacitor lifetime estimation method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569066A (en) * | 2016-10-26 | 2017-04-19 | 西安华为技术有限公司 | Method for detecting service life of bus capacitor and apparatus thereof |
| CN106597176A (en) * | 2016-12-30 | 2017-04-26 | 北京金风科创风电设备有限公司 | Method and system for predicting residual life of electrolytic capacitor |
| CN107505511A (en) * | 2016-06-14 | 2017-12-22 | 北京天诚同创电气有限公司 | life cycle prediction method, device and system of direct current support capacitor |
| CN107607818A (en) * | 2017-09-27 | 2018-01-19 | 四川大能科技有限公司 | A kind of electric motor car driver electric capacity lifetime estimation method and its system |
| CN110763946A (en) * | 2019-11-27 | 2020-02-07 | 南京埃斯顿自动化股份有限公司 | Method for real-time online diagnosis and life prediction of electrolytic capacitor life |
| CN110824361A (en) * | 2019-11-20 | 2020-02-21 | 中国船舶重工集团海装风电股份有限公司 | Method, device, equipment and medium for calculating residual life of super capacitor of wind turbine generator |
| CN111090017A (en) * | 2019-12-27 | 2020-05-01 | 珠海汇众能源科技有限公司 | Method for estimating service life of capacitor of frequency converter |
| CN111259316A (en) * | 2020-02-20 | 2020-06-09 | 上海辛格林纳新时达电机有限公司 | Method for calculating residual life of capacitor |
| CN111624430A (en) * | 2020-06-23 | 2020-09-04 | 科华恒盛股份有限公司 | Capacitor life online monitoring method and device and terminal equipment |
| CN111896817A (en) * | 2019-05-06 | 2020-11-06 | 麦克维尔空调制冷(武汉)有限公司 | Online capacitor life estimation system and method |
| CN111999557A (en) * | 2020-06-05 | 2020-11-27 | 国网湖北省电力有限公司电力科学研究院 | Method for evaluating service life of direct-current side electrolytic capacitor of power quality control device according to load curve |
| CN112505454A (en) * | 2020-11-25 | 2021-03-16 | 儒竞艾默生环境优化技术（上海）有限公司 | Capacitance life calculation method, system, medium, terminal, voltage detection circuit and driver |
| CN113504422A (en) * | 2021-06-29 | 2021-10-15 | 武汉世纪精能科技发展有限公司 | Super capacitor module monitoring and early warning method, device, storage medium and device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505511A (en) * | 2016-06-14 | 2017-12-22 | 北京天诚同创电气有限公司 | life cycle prediction method, device and system of direct current support capacitor |
| CN106569066A (en) * | 2016-10-26 | 2017-04-19 | 西安华为技术有限公司 | Method for detecting service life of bus capacitor and apparatus thereof |
| CN106597176A (en) * | 2016-12-30 | 2017-04-26 | 北京金风科创风电设备有限公司 | Method and system for predicting residual life of electrolytic capacitor |
| CN107607818A (en) * | 2017-09-27 | 2018-01-19 | 四川大能科技有限公司 | A kind of electric motor car driver electric capacity lifetime estimation method and its system |
| CN111896817B (en) * | 2019-05-06 | 2023-04-18 | 麦克维尔空调制冷(武汉)有限公司 | Online capacitor life estimation system and method |
| CN111896817A (en) * | 2019-05-06 | 2020-11-06 | 麦克维尔空调制冷(武汉)有限公司 | Online capacitor life estimation system and method |
| CN110824361A (en) * | 2019-11-20 | 2020-02-21 | 中国船舶重工集团海装风电股份有限公司 | Method, device, equipment and medium for calculating residual life of super capacitor of wind turbine generator |
| CN110763946B (en) * | 2019-11-27 | 2020-07-28 | 南京埃斯顿自动化股份有限公司 | Method for real-time online diagnosis and life prediction of electrolytic capacitor life |
| CN110763946A (en) * | 2019-11-27 | 2020-02-07 | 南京埃斯顿自动化股份有限公司 | Method for real-time online diagnosis and life prediction of electrolytic capacitor life |
| CN111090017A (en) * | 2019-12-27 | 2020-05-01 | 珠海汇众能源科技有限公司 | Method for estimating service life of capacitor of frequency converter |
| CN111259316A (en) * | 2020-02-20 | 2020-06-09 | 上海辛格林纳新时达电机有限公司 | Method for calculating residual life of capacitor |
| CN111259316B (en) * | 2020-02-20 | 2023-08-15 | 上海辛格林纳新时达电机有限公司 | Method for calculating residual life of capacitor |
| CN111999557A (en) * | 2020-06-05 | 2020-11-27 | 国网湖北省电力有限公司电力科学研究院 | Method for evaluating service life of direct-current side electrolytic capacitor of power quality control device according to load curve |
| CN111999557B (en) * | 2020-06-05 | 2022-03-22 | 国网湖北省电力有限公司电力科学研究院 | Method for evaluating service life of direct-current side electrolytic capacitor in power quality control device |
| CN111624430A (en) * | 2020-06-23 | 2020-09-04 | 科华恒盛股份有限公司 | Capacitor life online monitoring method and device and terminal equipment |
| CN112505454A (en) * | 2020-11-25 | 2021-03-16 | 儒竞艾默生环境优化技术（上海）有限公司 | Capacitance life calculation method, system, medium, terminal, voltage detection circuit and driver |
| CN113504422A (en) * | 2021-06-29 | 2021-10-15 | 武汉世纪精能科技发展有限公司 | Super capacitor module monitoring and early warning method, device, storage medium and device |
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