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估计LZ的问题是关于手持式电动工具标准中的测试内容吧!如果是的话,标准号应该是EN 60745-1或UL 60745-1。% |; s( a- A! c( C# |
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1. 48小时耐久测试之后标准中并没有要求进行绝缘电阻的测试评估,所以测试条件无从谈起;至于耐压测试肯定是要在耐久测试结束之后立即进行,测试电压为15章节中要求的电压值的75%(之前UL 745-1中要求的是50%的电压值,或者根据工厂的要求选择75%或100%)。. s d ~+ R) p. s2 N
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Compliance is checked by the test of 17.2 and, for tools provided with a centrifugal or other starting switch, also by the test of 17.3." H! R" [0 H0 z$ U+ e+ Z9 v: b
, c7 F2 A2 e% o5 vImmediately after these tests, the tool shall withstand an electric strength test as specified in clause 15, the test voltages being, however, reduced to 75% of the specified values. Connections shall not have worked loose, and there shall be no deterioration impairing safety in normal use.
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7 |2 S6 ?" ?6 z( S! O2. 至于碳粉黏附在电机表面而导致耐压击穿,个人认为应该判定为不合格。理由是耐久测试的时候,每种电压条件下机器应放置在不同的三个位置上工作,为的就是避免碳粉的非正常聚积:8 ^! W6 m5 _) j7 e+ k# g
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NOTE The change of position is made to prevent abnormal accumulation of carbon dust in any particular place. Examples of the three positions are horizontal, vertically up and vertically down.
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既然已经严格按照标准的要求进行了耐久测试,那么即使还是因为碳粉的原因造成测试的失败也是应该判为不合格的。" E, z3 B) W, l1 O9 L
h5 J" A7 Y- p# ~7 C- I关于这个问题是个人的见解,如有不同的意见,欢迎讨论! |
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