标题: UL电动工具温升过高 [打印本页] 作者: 水中月 时间: 2011-9-9 08:35 标题: UL电动工具温升过高 我们有一台电动工具,销售国是美国,准备做UL,因为温升测试值是76K(限值是75K),所以我们告诉国外客户,温升可能有点问题,并跟他解释了为什么,可是老外跟我们说:既然是76K,那为什么不做105K的那档呢,那样的话,不就OK了吗?我真不知道怎样才能跟他解释清楚?求给位帮忙!!谢谢!作者: 往事如烟 时间: 2011-9-9 08:39
客户要求你髙绝缘等级的马达,成本提高了,当然喜欢啦。作者: Liu 时间: 2011-9-9 09:25
不知道你是什么电动工具,UL745-1分Class A, Class E, Class B, Class F。其中Class A和Class E可以为given in the following examples。 7 ]0 q0 A: N4 R- \
Examples of Class A material are: ( f" W1 W* ~' c$ G6 a5 x. y– impregnated cotton, silk, artificial silk and paper; # F8 {/ c2 `6 p& @# K8 k, y– enamels based on oleo- or polyamide resins.) g& Y' U$ m5 W- j# K4 q7 H
+ T0 }' r& [, R# I" CExamples of Class E material are: & i! {3 v. Y4 R4 S: f. l: C$ f4 k4 z– moldings with cellulose fillers, cotton fabric laminates and paper laminates, bonded with melamineformaldehyde,( u) w, ]. p" L4 P/ G5 E
phenol-formaldehyde or phenol-furfural resins;+ _8 M' v: N, L* D. f6 w* I
– cross-linked polyester resins, cellulose triacetate film, polyethylene terephthalate films;7 z! h2 B# `9 v5 @/ F
– varnished polyethylene terephthalate textile bonded with oil-modified alkyd resin varnish;& ^. x7 u$ W- G% }# F( k
– enamels based on polyvinyl formal, polyurethane or epoxy resins.8 Q# o% E9 `& m& r, m
! K' _* U4 e" |7 T但是Class B and F Insulation System必须满足UL1446。 & U) A# l6 I* V% |如果没有UL1446认证,按Class E也只能做到90K。 1 D9 g- B, N% f' ~, ^6 ~ " ]# V" Z' T& k' k7 X% ]+ _还有个例外就是: 9 Y* I6 t. g6 j. W% g9 i" e' V# OFor totally enclosed motors the temperature rise limits for Class A, Class E, and Class B may be increased by 5°C。8 a5 v& m' `, F# ?) E8 l