Protection method and apparatus for electric motor
The invention discloses a protection method and apparatus for an electric motor. The protection method comprises the steps of obtaining first current information of the electric motor in a last period when it is detected that the bus voltage of the electric motor disappears, and recording time-delay...
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| creator | KANG YING GAO LONGJI JIANG YUHONG CHANG LIANG CHANG HONGQI ZHANG JIAN HOU HONGMIN XUE LIMIN LI HUIYONG ZHAO CHANGBING ZHANG SIYONG HAO LIPENG OUYANG QIANG WANG JINGREN LIU XINGCHANG LI ZENGLI LI LIXIA |
| description | The invention discloses a protection method and apparatus for an electric motor. The protection method comprises the steps of obtaining first current information of the electric motor in a last period when it is detected that the bus voltage of the electric motor disappears, and recording time-delay duration, wherein the last period refers to a last detection period based on a detection period at the first moment when the bus voltage disappears; when the recorded time-delay duration achieves predetermined duration, sampling second current information at a second moment when the time-delay duration achieves the predetermined duration; comparing the first current information with the second current information; and if the comparison result indicates that the electric motor has a feedback current at the second moment, starting low-voltage protection of the electric motor. By adoption of the protection method and apparatus, the technical problem of misoperation of the low-voltage protection caused by direct imple |
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The protection method comprises the steps of obtaining first current information of the electric motor in a last period when it is detected that the bus voltage of the electric motor disappears, and recording time-delay duration, wherein the last period refers to a last detection period based on a detection period at the first moment when the bus voltage disappears; when the recorded time-delay duration achieves predetermined duration, sampling second current information at a second moment when the time-delay duration achieves the predetermined duration; comparing the first current information with the second current information; and if the comparison result indicates that the electric motor has a feedback current at the second moment, starting low-voltage protection of the electric motor. 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The protection method comprises the steps of obtaining first current information of the electric motor in a last period when it is detected that the bus voltage of the electric motor disappears, and recording time-delay duration, wherein the last period refers to a last detection period based on a detection period at the first moment when the bus voltage disappears; when the recorded time-delay duration achieves predetermined duration, sampling second current information at a second moment when the time-delay duration achieves the predetermined duration; comparing the first current information with the second current information; and if the comparison result indicates that the electric motor has a feedback current at the second moment, starting low-voltage protection of the electric motor. By adoption of the protection method and apparatus, the technical problem of misoperation of the low-voltage protection caused by direct imple</description><subject>CONVERSION OR DISTRIBUTION OF ELECTRIC POWER</subject><subject>ELECTRICITY</subject><subject>EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS</subject><subject>GENERATION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2016</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZDAKKMovSU0uyczPU8hNLcnIT1FIzAPigoLEosSS0mKFtPwihdQcoIqizGSF3PyS_CIeBta0xJziVF4ozc2g6OYa4uyhm1qQH59aXJCYnJqXWhLv7GdoYGZkYG5pbuxoTIwaAOWRLE4</recordid><startdate>20161207</startdate><enddate>20161207</enddate><creator>KANG YING</creator><creator>GAO LONGJI</creator><creator>JIANG YUHONG</creator><creator>CHANG LIANG</creator><creator>CHANG HONGQI</creator><creator>ZHANG JIAN</creator><creator>HOU HONGMIN</creator><creator>XUE LIMIN</creator><creator>LI HUIYONG</creator><creator>ZHAO CHANGBING</creator><creator>ZHANG SIYONG</creator><creator>HAO LIPENG</creator><creator>OUYANG QIANG</creator><creator>WANG JINGREN</creator><creator>LIU XINGCHANG</creator><creator>LI ZENGLI</creator><creator>LI LIXIA</creator><scope>EVB</scope></search><sort><creationdate>20161207</creationdate><title>Protection method and apparatus for electric motor</title><author>KANG YING ; GAO LONGJI ; JIANG YUHONG ; CHANG LIANG ; CHANG HONGQI ; ZHANG JIAN ; HOU HONGMIN ; XUE LIMIN ; LI HUIYONG ; ZHAO CHANGBING ; ZHANG SIYONG ; HAO LIPENG ; OUYANG QIANG ; WANG JINGREN ; LIU XINGCHANG ; LI ZENGLI ; LI LIXIA</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_CN106207973A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>chi ; eng</language><creationdate>2016</creationdate><topic>CONVERSION OR DISTRIBUTION OF ELECTRIC POWER</topic><topic>ELECTRICITY</topic><topic>EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS</topic><topic>GENERATION</topic><toplevel>online_resources</toplevel><creatorcontrib>KANG YING</creatorcontrib><creatorcontrib>GAO LONGJI</creatorcontrib><creatorcontrib>JIANG YUHONG</creatorcontrib><creatorcontrib>CHANG LIANG</creatorcontrib><creatorcontrib>CHANG HONGQI</creatorcontrib><creatorcontrib>ZHANG JIAN</creatorcontrib><creatorcontrib>HOU HONGMIN</creatorcontrib><creatorcontrib>XUE LIMIN</creatorcontrib><creatorcontrib>LI HUIYONG</creatorcontrib><creatorcontrib>ZHAO CHANGBING</creatorcontrib><creatorcontrib>ZHANG SIYONG</creatorcontrib><creatorcontrib>HAO LIPENG</creatorcontrib><creatorcontrib>OUYANG QIANG</creatorcontrib><creatorcontrib>WANG JINGREN</creatorcontrib><creatorcontrib>LIU XINGCHANG</creatorcontrib><creatorcontrib>LI ZENGLI</creatorcontrib><creatorcontrib>LI LIXIA</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>KANG YING</au><au>GAO LONGJI</au><au>JIANG YUHONG</au><au>CHANG LIANG</au><au>CHANG HONGQI</au><au>ZHANG JIAN</au><au>HOU HONGMIN</au><au>XUE LIMIN</au><au>LI HUIYONG</au><au>ZHAO CHANGBING</au><au>ZHANG SIYONG</au><au>HAO LIPENG</au><au>OUYANG QIANG</au><au>WANG JINGREN</au><au>LIU XINGCHANG</au><au>LI ZENGLI</au><au>LI LIXIA</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Protection method and apparatus for electric motor</title><date>2016-12-07</date><risdate>2016</risdate><abstract>The invention discloses a protection method and apparatus for an electric motor. The protection method comprises the steps of obtaining first current information of the electric motor in a last period when it is detected that the bus voltage of the electric motor disappears, and recording time-delay duration, wherein the last period refers to a last detection period based on a detection period at the first moment when the bus voltage disappears; when the recorded time-delay duration achieves predetermined duration, sampling second current information at a second moment when the time-delay duration achieves the predetermined duration; comparing the first current information with the second current information; and if the comparison result indicates that the electric motor has a feedback current at the second moment, starting low-voltage protection of the electric motor. By adoption of the protection method and apparatus, the technical problem of misoperation of the low-voltage protection caused by direct imple</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION |
| title | Protection method and apparatus for electric motor |
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