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UL507风扇标准中关于风扇的扇叶有如下要求:
: r5 H {/ [ N6.4.2 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 z- q1 r- S w 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:
$ {" x7 k& A8 J 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 I# i/ J- A9 \( h( q
其中例外1“For all motor types except skeleton or open frame”是指哪种电机?$ h6 s! i1 L- \1 e6 l
例外2“For bobbin-wound skeleton motors”又是指哪种电机。6 `2 g" G, v# f+ @
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。2 Y+ H; K- q+ g- Y0 s' Y
) Y7 V' ^9 O* K电机1* {( h4 r: E" @3 i
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8 H- Q2 d1 k4 p1 e: M8 V5 M电机2/ ?- V6 x& f5 N
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