安规网

标题: DSH 263 Earthing connection through moving part of class I motor [打印本页]
作者: 小米    时间: 2012-11-8 15:30
标题: DSH 263 Earthing connection through moving part of class I motor
DSH 2635 @) M0 ^/ E/ {, {6 E: ?
& S' F3 }# B% b5 l+ m! X
Earthing connection through moving part of class I motor: O/ ^  X0 u0 \6 ~1 O" c
19.11.2, 25.1 and 25.6: m7 r  U& p' A
60745-1(ed.2) & 61029-1(ed.1)- s# m9 T% j" i& l
) s0 z. [3 P. a& D$ d1 P+ ]7 i
Standard: IEC 61029-1, Ed. 1 / IEC1 b3 P+ R# R/ }5 J
60745-1, Ed. 2
0 @' g* J8 u5 e' h/ Z& O% mSubclauses: 19.11.2,
5 f5 s6 g% n  U! U25.1 and 25.6/ G4 D) O+ a/ L5 c& i
Sheet n 263
' y3 w0 B7 B" g* T' HPage 1(1)
2 K# P  `' `; S7 U. }- J2 b' eSubject: earthing connection! D* r- O/ J& T
through moving part of class I! R/ S5 Q9 W9 d& y$ ^
motor
. ^/ G( N& Q1 O1 kKey words:) k7 s; l" T. T3 ?* K7 W) F9 E6 p
- earth connection,
, Z8 J( c, ~! z5 T- e; _- D- moving part
* B) H, q/ e, rDecision n.19 taken
4 h& f# r0 Z9 z" Q" ~# z6 [! V4 d! |at 35th meeting/1998
! d8 S( N- ^$ q  Z8 vQuestion:7 Y: L; h$ ~- K1 _* g+ {+ \! u
We consider a class I tool employing a universal type motor. The motor shaft is
. i. X) a7 Z! N8 a" i+ K3 o) }( vconductively coupled to the earthed enclosure through steel ball bearings.- ]" M# }, N1 z2 K5 @5 Y8 u: M
In this case, shall the motor be of class II construction (motor shaft separated from the rotor
( ?3 T- B, [5 @/ R' {  o& Fwindings and commutator by double or reinforced insulation) ?
- R3 O* I, P- W8 q2 UDecision:
3 g2 {/ ?8 `4 x/ cYes, the accessible motor shaft of a class I tool shall be separated from the rotor windings7 ]8 |6 o: k- R3 D3 r
and commutator by double or reinforced insulation (class II construction).% y6 k, U; ?3 B( Y, G+ r
[attach]77272[/attach]
5 l* G, F) g2 B, j



欢迎光临 安规网 (http://bbs.angui.org/) Powered by Discuz! X3.2