JPH0847211A - Motor testing equipment - Google Patents
Motor testing equipmentInfo
- Publication number
- JPH0847211A JPH0847211A JP17866494A JP17866494A JPH0847211A JP H0847211 A JPH0847211 A JP H0847211A JP 17866494 A JP17866494 A JP 17866494A JP 17866494 A JP17866494 A JP 17866494A JP H0847211 A JPH0847211 A JP H0847211A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- temperature
- test
- load
- load motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 55
- 230000005856 abnormality Effects 0.000 claims description 36
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば電気自動車の走
行用モータを試験する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing a traction motor of an electric vehicle, for example.
【０００２】[0002]
【従来の技術】モータの耐久試験等を行う装置としては
例えば特開平３−２１２１９４号公報に開示されたもの
がある。この装置では、供試モータに対し負荷モータに
よって負荷を与え、供試モータ及び負荷モータそれぞれ
を所定条件下で運転して供試モータを試験する。試験中
に発生した異常は、各種センサを設けることにより検出
できる。2. Description of the Related Art As a device for performing a durability test of a motor, there is one disclosed in, for example, Japanese Patent Laid-Open No. 3-212194. In this device, a load is applied to the test motor by a load motor, and the test motor and the load motor are operated under predetermined conditions to test the test motor. The abnormality that occurred during the test can be detected by providing various sensors.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、センサ
を設けていない箇所（不測箇所）に異常が生じた場合
や、準備しているセンサでは検出できない種類の異常
（不測量）が生じた場合には、生じた時点で異常を検出
することができない。無論、試験装置に何らかの異常が
生じた場合、この異常は、遅かれ早かれ試験装置の他の
部位にあるいは他の形で、別の異常を引き起こすから、
当該別の異常を検出することにより不測箇所の異常等を
検出できる。しかし、この時点ではすでに有効な対処を
講じ得ず、試験装置の破壊に至る可能性が高い。また、
不測箇所や不測量を無くすには、多数のセンサを設ける
必要があり、経済的でない。However, when an abnormality occurs in a portion where a sensor is not provided (unexpected location) or when a type of abnormality that cannot be detected by the prepared sensor (unexpected measurement) occurs. , The abnormality cannot be detected when it occurs. Of course, if something goes wrong with the test device, it will sooner or later cause another anomaly in other parts of the test device or in some other way,
By detecting the other abnormality, an abnormality at an unexpected location can be detected. However, effective measures cannot be taken at this point, and there is a high possibility that the test equipment will be destroyed. Also,
It is necessary to provide a large number of sensors in order to eliminate unintended locations and unintended measurements, which is not economical.
【０００４】本発明は、このような問題点を解決するこ
とを課題としてなされたものであり、試験装置の異常を
間接的ながらも早期に検出する手段を設けることによ
り、多数のセンサを設けることなく、不測箇所の異常や
不測量の異常が発生した場合でもこれを早期に検出し、
試験装置の破壊を防ぎ、またその復旧に要する工数を低
減することを目的とする。The present invention has been made to solve the above problems, and provides a large number of sensors by providing means for early detection of abnormality of a test apparatus although indirectly. Even if an unexpected location abnormality or an unexpected survey abnormality occurs, this can be detected early and
The purpose is to prevent destruction of the test equipment and to reduce the number of man-hours required for restoration.
【０００５】[0005]
【課題を解決するための手段】このような目的を達成す
るために、本発明のモータの試験装置は、供試モータに
負荷を与える負荷モータと、供試モータと負荷モータを
連結する機構と、供試モータ及び負荷モータを所定時間
に亘って一定条件にて運転する手段と、負荷モータの温
度を検出する手段と、上記運転の開始後負荷モータの温
度が一旦安定し、その後当該負荷モータの温度が低下し
た場合に、上記機構に異常が生じたと判断する手段と、
を備えることを特徴とする。In order to achieve such an object, a motor testing apparatus of the present invention comprises a load motor for applying a load to a test motor and a mechanism for connecting the test motor and the load motor. A means for operating the test motor and the load motor under constant conditions for a predetermined time, a means for detecting the temperature of the load motor, the temperature of the load motor once stabilized after the start of the above operation, and then the load motor Means for determining that an abnormality has occurred in the above mechanism when the temperature of
It is characterized by including.
【０００６】[0006]
【作用】本発明においては、供試モータ及び負荷モータ
を所定時間に亘って一定条件にて運転し例えば耐久試験
等の試験を実施する際、上記運転の開始後負荷モータの
温度が一旦安定し、その後当該負荷モータの温度が低下
した場合に、供試モータと負荷モータを連結する機構に
異常が生じたと判断される。すなわち、この機構に異常
が生じ負荷モータの負荷が低減すると、負荷モータの発
熱量も一時的に低下する。この後、この機構の異常が進
行し負荷モータが無負荷運転に近付くと負荷モータの発
熱は再度増加に転じ、過電流等別の種類の異常が発生す
る。一旦この種類の異常が発生すると、試験装置の破壊
につながりやすい。本発明においては、当該別の種類の
異常が発生するより前に、負荷モータの温度低下という
現象を捕え、機構の異常を検出する。従って、本発明に
おいては、追加するセンサは負荷モータの温度検出手段
のみでよい。また、不測箇所の異常や不測量の異常が発
生した場合でもこれを早期に検出し、試験装置の破壊を
防ぎ、またその復旧に要する工数を低減することができ
る。In the present invention, when the test motor and the load motor are operated under a constant condition for a predetermined time and a test such as a durability test is carried out, the temperature of the load motor is temporarily stabilized after the start of the above operation. After that, when the temperature of the load motor decreases, it is determined that an abnormality has occurred in the mechanism connecting the test motor and the load motor. That is, when an abnormality occurs in this mechanism and the load on the load motor is reduced, the amount of heat generated by the load motor also temporarily decreases. After that, when the abnormality of this mechanism progresses and the load motor approaches the no-load operation, the heat generation of the load motor starts to increase again, and another type of abnormality such as overcurrent occurs. Once this type of anomaly occurs, it is likely to damage the test equipment. In the present invention, the phenomenon of the temperature drop of the load motor is caught and the abnormality of the mechanism is detected before the other type of abnormality occurs. Therefore, in the present invention, the additional sensor is only the temperature detecting means of the load motor. Further, even when an abnormality of an unexpected location or an abnormality of an unexpected measurement occurs, this can be detected early, the destruction of the test apparatus can be prevented, and the man-hour required for the restoration can be reduced.
【０００７】[0007]
【実施例】以下、本発明の好適な実施例について図面に
基づき説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.
【０００８】図１には、本発明の一実施例に係る装置の
構成が示されている。この実施例の評価装置１は、供試
モータ２に対し負荷モータ３により負荷を与えつつ回転
駆動させることにより、供試モータ２の耐久試験等を行
う評価装置である。そのため、供試モータ２と負荷モー
タ３の間は機械的に連結されている。この図において
は、連結機構は、供試モータ２の出力トルクを検出する
トルクセンサ４、負荷モータ３の軸速度を減速する減速
機５、及び各種のカップリング（回転軸を支えているベ
アリング等）６から構成されている。FIG. 1 shows the configuration of an apparatus according to an embodiment of the present invention. The evaluation device 1 of this embodiment is an evaluation device that performs a durability test and the like of the sample motor 2 by rotating the sample motor 2 while applying a load from the load motor 3 to the sample motor 2. Therefore, the test motor 2 and the load motor 3 are mechanically connected. In this figure, the coupling mechanism includes a torque sensor 4 that detects the output torque of the test motor 2, a speed reducer 5 that reduces the shaft speed of the load motor 3, and various couplings (bearings that support the rotating shaft, etc.). ) 6.
【０００９】供試モータ２及び負荷モータ３は、それぞ
れ、インバータ７又は９及びコントローラ８又は１０に
より制御される。すなわち、インバータ７及び９は、図
示しない直流電源から供給される電力を、コントローラ
８又は１０から供給されるスイッチング信号に応じて交
流に変換し、これを供試モータ２又は負荷モータ３に駆
動電力として供給する。The test motor 2 and the load motor 3 are controlled by an inverter 7 or 9 and a controller 8 or 10, respectively. That is, the inverters 7 and 9 convert electric power supplied from a DC power source (not shown) into AC according to a switching signal supplied from the controller 8 or 10, and drive this electric power to the test motor 2 or the load motor 3. Supply as.
【００１０】ホストコンピュータ１１は、評価装置１の
各部の状態をモニタしながら、コントローラ８及び１０
に指令を与え、供試モータ２及び負荷モータ３を、所定
の試験条件に則り駆動させる。例えば供試モータ２の最
高速連続耐久試験を行う場合には、トルクセンサ４の出
力のフィードバックを受けながら供試モータ２を一定ト
ルク運転させ（ＡＴＲ）、負荷モータ３の回転軸速度の
フィードバックを受けながら負荷モータ３を一定速度運
転させる（ＡＳＲ）。また、ホストコンピュータ１１
は、試験中に生じた各種の異常を検出すべく、評価装置
１の各部に設けられた温度センサ、振動センサ等の外部
センサ１３から各種の検出値を入力し、異常の有無を判
定して異常時には所定の異常処理を実行する。The host computer 11 monitors the state of each part of the evaluation apparatus 1 while controlling the controllers 8 and 10.
To drive the test motor 2 and the load motor 3 in accordance with predetermined test conditions. For example, when performing the highest speed continuous durability test of the test motor 2, the test motor 2 is operated at a constant torque (ATR) while receiving the feedback of the output of the torque sensor 4, and the feedback of the rotational shaft speed of the load motor 3 is performed. While receiving, the load motor 3 is operated at a constant speed (ASR). In addition, the host computer 11
In order to detect various abnormalities that occurred during the test, various detection values are input from an external sensor 13 such as a temperature sensor and a vibration sensor provided in each part of the evaluation device 1, and the presence or absence of abnormality is determined. When an abnormality occurs, a predetermined abnormality process is executed.
【００１１】この実施例が特徴としているのは、負荷モ
ータ３の温度、特にそのコイル温度を検出する温度セン
サ１２を設け、これによってトルクセンサ４、減速機
５、カップリング６等のベアリングや歯車に生じた異常
な機械的ロス等を、早期に検出可能にした点である。This embodiment is characterized in that a temperature sensor 12 for detecting the temperature of the load motor 3, in particular, the coil temperature thereof is provided, so that the bearings and gears such as the torque sensor 4, the speed reducer 5, the coupling 6 and the like are provided. This is the point that it was possible to detect abnormal mechanical loss and the like that occurred in the early stage.
【００１２】図２に示されるように、ホストコンピュー
タ１１は、試験を開始する際、まずトルクセンサ４、減
速機５、外部センサ１３、コントローラ８及び１０等か
ら、何らかの異常を示す信号乃至情報が入力されていな
いか否か、確認する（１００）。異常が検出されている
場合にはステップ１１４に移行し所定の異常処理を実行
する。異常が検出されていない場合、ホストコンピュー
タ１１は、行おうとしている試験が耐久試験か否かを判
定し（１０２）、耐久試験でない場合にはステップ１０
０に戻る。耐久試験である場合、ホストコンピュータ１
１は、温度センサ１２によって検出される温度が一定値
に収束するまで待つ（１０４）。ホストコンピュータ１
１は、一定値に収束した時点でこの値を基準値として記
憶する（１０６）。As shown in FIG. 2, when starting the test, the host computer 11 first receives a signal or information indicating some abnormality from the torque sensor 4, the speed reducer 5, the external sensor 13, the controllers 8 and 10, and the like. It is confirmed whether or not it is input (100). If an abnormality is detected, the process proceeds to step 114 and a predetermined abnormality process is executed. If no abnormality is detected, the host computer 11 determines whether or not the test to be performed is a durability test (102), and if it is not the durability test, step 10
Return to 0. In case of endurance test, host computer 1
1 waits until the temperature detected by the temperature sensor 12 converges to a constant value (104). Host computer 1
1 stores this value as a reference value when it converges to a constant value (106).
【００１３】ホストコンピュータ１１は、図２に示され
る処理ルーチンを繰り返す際、毎回、温度センサ１２に
より検出される温度が基準温度から見て所定程度以上に
低下しているか否かを判定する（１０８，１１０）。低
下していない場合には、さらに温度変化率についても判
定する（１１２）。温度センサ１２により検出される温
度が基準温度から見て所定程度以上に低下しておらず温
度変化率も所定の温度変化率基準値より小さい場合に
は、ホストコンピュータ１１は、供試モータ２と負荷モ
ータ３を連結する機構のロス等は発生していないとみな
し、ステップ１００に戻る。逆に、温度センサ１２によ
り検出される温度が基準温度から見て所定程度以上に低
下しているかあるいは温度変化率が温度変化率基準値よ
り大きい場合には、ホストコンピュータ１１は、供試モ
ータ２と負荷モータ３を連結する機構のロス等が発生し
ているとみなし、ステップ１１４に進む。Each time the host computer 11 repeats the processing routine shown in FIG. 2, it determines whether or not the temperature detected by the temperature sensor 12 has dropped to a predetermined level or more from the reference temperature (108). , 110). If it has not decreased, the rate of temperature change is further determined (112). When the temperature detected by the temperature sensor 12 is not lower than the reference temperature by a predetermined level or more and the temperature change rate is smaller than the predetermined temperature change rate reference value, the host computer 11 determines that the motor under test 2 It is considered that the loss of the mechanism connecting the load motor 3 has not occurred, and the process returns to step 100. On the contrary, if the temperature detected by the temperature sensor 12 is lower than the reference temperature by a predetermined level or the temperature change rate is larger than the temperature change rate reference value, the host computer 11 determines that the motor under test 2 It is considered that a loss or the like has occurred in the mechanism connecting the load motor 3 with the load motor 3, and the routine proceeds to step 114.
【００１４】従って、本実施例によれば、外部センサ１
３等を設けていない箇所に異常が発生した場合に、これ
を温度センサ１２により負荷モータ３のコイル温度の低
下によって検出するようにしたため、多数のセンサを用
いることなく、かつ評価装置１に顕著な故障乃至破壊が
生じるのに先立ち、上述の機構の異常を検出できる。ま
た、機構に異常が生じた場合負荷モータ３の電流にも低
下が現れるが、電流には通常リップルが重畳しており、
微妙な判定に用いるのは難しい。本実施例では、温度を
検出することにより、安定で緻密な判定を可能にしてい
る。また、温度低下後負荷モータ３の温度は上昇し始め
るので、この温度上昇を捕えても異常を検出できる。本
実施例では、温度上昇に先立つ温度低下を捕えているた
め、早期の異常発見が可能である。また、温度低下を負
荷モータ３側で検出しているため、供試モータ２にセン
サを付設する等の必要もない。Therefore, according to this embodiment, the external sensor 1
When an abnormality occurs in a place where 3 or the like is not provided, the temperature sensor 12 detects the abnormality by the decrease in the coil temperature of the load motor 3, so that the evaluation device 1 can be distinguished without using many sensors. The abnormality of the above-mentioned mechanism can be detected before the occurrence of such a failure or destruction. Further, when an abnormality occurs in the mechanism, the current of the load motor 3 also decreases, but a ripple is usually superimposed on the current,
It is difficult to use for delicate judgment. In this embodiment, by detecting the temperature, stable and precise determination is possible. Moreover, since the temperature of the load motor 3 starts to rise after the temperature has dropped, an abnormality can be detected even if this temperature rise is captured. In this embodiment, since the temperature decrease that precedes the temperature increase is captured, it is possible to detect an abnormality early. Further, since the temperature drop is detected on the load motor 3 side, it is not necessary to attach a sensor to the test motor 2 or the like.
【００１５】[0015]
【発明の効果】以上説明したように、本発明によれば、
供試モータ及び負荷モータを所定時間に亘って一定条件
にて運転し例えば耐久試験等の試験を実施する際、運転
開始後負荷モータの温度が一旦安定し、その後当該負荷
モータの温度が低下した場合に、供試モータと負荷モー
タを連結する機構に異常が生じたと判断するようにした
ため、不測箇所の異常や不測量の異常が発生した場合で
もこれを早期に検出し、試験装置の破壊を防ぎ、またそ
の復旧に要する工数を低減することができる。また、追
加するセンサは負荷モータの温度検出手段のみでよく、
経済的な試験装置がえられる。As described above, according to the present invention,
When the test motor and the load motor are operated under a constant condition for a predetermined time and a test such as an endurance test is performed, the temperature of the load motor stabilizes once after the start of operation, and then the temperature of the load motor drops. In this case, it was determined that there was an abnormality in the mechanism that connects the test motor and the load motor.Therefore, even if an abnormality in an unexpected location or an abnormality in an unexpected measurement occurred, this could be detected early to prevent damage to the test equipment. It is possible to prevent it and reduce the man-hour required for the restoration. Also, the additional sensor is only the temperature detection means of the load motor,
Economical test equipment is available.
【図１】本発明の一実施例に係る装置の構成を示す図で
ある。FIG. 1 is a diagram showing a configuration of an apparatus according to an embodiment of the present invention.
【図２】この実施例におけるホストコンピュータの動作
の流れを示すフローチャートである。FIG. 2 is a flowchart showing a flow of operation of a host computer in this embodiment.
１ 評価装置 ２ 供試モータ ３ 負荷モータ ４ トルクセンサ ５ 減速機 ６ カップリング ７，９ インバータ ８，１０ コントローラ １１ ホストコンピュータ １２ 温度センサ １３ 外部センサ 1 Evaluation device 2 Test motor 3 Load motor 4 Torque sensor 5 Reducer 6 Coupling 7,9 Inverter 8,10 Controller 11 Host computer 12 Temperature sensor 13 External sensor
Claims (1)
と、供試モータと負荷モータを連結する機構と、供試モ
ータ及び負荷モータを所定時間に亘って一定条件にて運
転する手段と、を備えるモータの試験装置において、 負荷モータの温度を検出する手段と、 上記運転の開始後負荷モータの温度が一旦安定し、その
後当該負荷モータの温度が低下した場合に、上記機構に
異常が生じたと判断する手段と、 を備えることを特徴とするモータの試験装置。1. A load motor for applying a load to a test motor, a mechanism for connecting the test motor and the load motor, and means for operating the test motor and the load motor under a constant condition for a predetermined time. In the equipped motor test apparatus, when the temperature of the load motor is once stabilized after the start of the operation and the temperature of the load motor is lowered after the start of the operation, it is determined that an abnormality occurs in the mechanism. A device for testing a motor, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17866494A JPH0847211A (en) | 1994-07-29 | 1994-07-29 | Motor testing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17866494A JPH0847211A (en) | 1994-07-29 | 1994-07-29 | Motor testing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0847211A true JPH0847211A (en) | 1996-02-16 |
Family
ID=16052416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17866494A Pending JPH0847211A (en) | 1994-07-29 | 1994-07-29 | Motor testing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0847211A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11108799A (en) * | 1997-10-07 | 1999-04-23 | Daikin Ind Ltd | Gear testing device |
| KR101460658B1 (en) * | 2013-03-19 | 2014-11-12 | 국방과학연구소 | Apparatus evaluating performance of motor for turret |
| CN104897405A (en) * | 2015-06-24 | 2015-09-09 | 无锡市朗迪测控技术有限公司 | Starter simulation torsional vibration test stand |
| CN105807220A (en) * | 2014-12-30 | 2016-07-27 | 上汽通用五菱汽车股份有限公司 | Driving motor test control method for electric automobile |
| CN106352925A (en) * | 2016-09-21 | 2017-01-25 | 中国运载火箭技术研究院 | Device for determining performance of control surface transmission mechanism in thermal-mechanical environments |
| JP2018080924A (en) * | 2016-11-14 | 2018-05-24 | 日本精工株式会社 | Method and system for diagnosing abnormality of bearing |
| CN108663147A (en) * | 2012-10-12 | 2018-10-16 | 国际计测器株式会社 | Torque given unit, driving device and Tire testing device |
| KR20190001337U (en) * | 2019-05-27 | 2019-06-05 | 서정랑 | endurance test system of motor for a door of train |
| KR20220075458A (en) * | 2020-11-30 | 2022-06-08 | 재단법인한국조선해양기자재연구원 | Temperature Performance Test Method for Motor |
-
1994
- 1994-07-29 JP JP17866494A patent/JPH0847211A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11108799A (en) * | 1997-10-07 | 1999-04-23 | Daikin Ind Ltd | Gear testing device |
| CN108663147A (en) * | 2012-10-12 | 2018-10-16 | 国际计测器株式会社 | Torque given unit, driving device and Tire testing device |
| KR101460658B1 (en) * | 2013-03-19 | 2014-11-12 | 국방과학연구소 | Apparatus evaluating performance of motor for turret |
| CN105807220A (en) * | 2014-12-30 | 2016-07-27 | 上汽通用五菱汽车股份有限公司 | Driving motor test control method for electric automobile |
| CN104897405A (en) * | 2015-06-24 | 2015-09-09 | 无锡市朗迪测控技术有限公司 | Starter simulation torsional vibration test stand |
| CN106352925A (en) * | 2016-09-21 | 2017-01-25 | 中国运载火箭技术研究院 | Device for determining performance of control surface transmission mechanism in thermal-mechanical environments |
| JP2018080924A (en) * | 2016-11-14 | 2018-05-24 | 日本精工株式会社 | Method and system for diagnosing abnormality of bearing |
| KR20190001337U (en) * | 2019-05-27 | 2019-06-05 | 서정랑 | endurance test system of motor for a door of train |
| KR20220075458A (en) * | 2020-11-30 | 2022-06-08 | 재단법인한국조선해양기자재연구원 | Temperature Performance Test Method for Motor |
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