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UL507风扇标准中关于风扇的扇叶有如下要求:
! V0 {8 R* Y2 g) F! D, P) i6.4.2 An impeller of polymeric material outside a motor shall not be located within 25.4 mm (1 inch) of an opening in the motor housing.
, V$ s# s$ Y- V6 o* G Exception No. 1: For all motor types except skeleton or open frame, an impeller is not prohibited from being within 25.4 mm of an opening in the motor housing when:
: `% @. `1 n% r% \& G- x& N) Y Exception No. 2: For bobbin-wound skeleton motors employed in a product other than ceiling-insert, wall-insert fans, or rangehoods, an impeller is not prohibited from being within 25.4 mm of the motor windings when:
1 ?& L2 h `$ ]; X& _1 ]其中例外1“For all motor types except skeleton or open frame”是指哪种电机?3 ?9 W4 g3 ]: c3 j* Z+ C
例外2“For bobbin-wound skeleton motors”又是指哪种电机。
5 @# W% i; H6 E7 H4 P3 U7 a 我的风扇有串激的,也有罩激的,如图,谁能帮忙确定下,电机1和电机2分别适用哪条例外。
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电机2
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