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UL507风扇标准中关于风扇的扇叶有如下要求:/ J3 |+ }" }' n. y; o* M% x
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.% \& W7 D9 w$ T. I. G0 v6 b# S7 o
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:/ x/ G3 h6 z" d& U7 `6 Q2 }/ t& v5 H
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:* E g9 M: @# Y, a: _1 Z2 q
其中例外1“For all motor types except skeleton or open frame”是指哪种电机? F: \& H" N8 K5 B8 p
例外2“For bobbin-wound skeleton motors”又是指哪种电机。( F* g3 x8 _2 H
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。3 e0 J' G) l' t' k
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0 U A# g" M" N( x电机2* @* R* A) G2 g; n" g5 e
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