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UL507风扇标准中关于风扇的扇叶有如下要求:
3 {3 o2 E% |( {9 ~! X0 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.0 w/ j+ L, W# D- ^& t6 M* H- D
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:
- p0 D/ U; @) Q) {2 \1 \& _& n- D 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:
* V/ ~. P1 [% N2 b" S其中例外1“For all motor types except skeleton or open frame”是指哪种电机?% R! n2 P1 W s6 T( T7 T$ w
例外2“For bobbin-wound skeleton motors”又是指哪种电机。: p2 x% S3 v1 ]7 ~5 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。* ~( X4 h! j+ A# V% q8 w
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电机1
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Z! ]' E* f5 y3 m$ |# ^电机2
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