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UL507风扇标准中关于风扇的扇叶有如下要求:+ p8 [0 p$ ~. C0 i) k. \ w1 G& E
6.4.2 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.
4 ?: D( D2 |& T 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:
. g' X. }+ H8 E 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:& H% p$ X4 a% l1 Y6 D0 }- \2 d
其中例外1“For all motor types except skeleton or open frame”是指哪种电机?
* h4 c; A8 @/ v2 P6 B 例外2“For bobbin-wound skeleton motors”又是指哪种电机。5 S+ {% `4 v2 T/ S4 I% K
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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5 @: j0 i/ u; [+ E8 X/ V电机1* r6 S: q5 u) s
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电机2
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