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关于解决交流电磁型低电压继电器全电压抖动问题的探讨
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作者 林万里 《继电器》 CSCD 1991年第3期62-63,共2页
目前,继电保护行业对低电压继电器在全电压下抖动问题非常关注,因为“抖动”不仅缩短继电器的使用寿命,而且会发生意料不到的故障。辟如,随着轴承的磨损,误差增大;同时,磨损落下的铜屑可能会使触点短路,造成继电器误动作;如果抖动情况严... 目前,继电保护行业对低电压继电器在全电压下抖动问题非常关注,因为“抖动”不仅缩短继电器的使用寿命,而且会发生意料不到的故障。辟如,随着轴承的磨损,误差增大;同时,磨损落下的铜屑可能会使触点短路,造成继电器误动作;如果抖动情况严重,甚至可使触点产生回跳,动作可靠性降低,若带较大负载时,因回跳而产生的电弧易使触点产生熔焊。因此,各厂家均在寻找比较好的方法解决该问题。 展开更多
关键词 电磁断电器 交流型 电压抖动
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Research of EDM Spark Locations in Die-sinking
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作者 韩强 何勇 杨向萍 《Journal of Donghua University(English Edition)》 EI CAS 2004年第2期130-134,共5页
Detection of 2-dimention spark locations by electromagnetic detection method in electrical discharge machining (EDM) is studied. The method, which is applied and investigated, is based on the fact that the release of ... Detection of 2-dimention spark locations by electromagnetic detection method in electrical discharge machining (EDM) is studied. The method, which is applied and investigated, is based on the fact that the release of energy from a spark is transformed into electromagnetic wave around the workpiece. A new sensor system composed of high precision linear Hall components and cubic ferrite is used to detect the intensity of magnetic field. Relation equation between the output of the sensor system and 2-dimention spark locations experiment under a spiculate electrode is introduced, and its diagram of curve is drawn. As a result, the information that can be achieved by detecting spark’s location gives new possibilities for an extended analysis of the EDM-process. 展开更多
关键词 Electrical discharge machining (EDM) Electromagnetic detection Spark locations On-line detection Hall sensor system
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