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|  DSH 2634 V/ L. m2 d8 m0 r3 u
2 p1 X9 [' F6 ~- w" g/ O8 O | Earthing connection through moving part of class I motor" y. U/ r/ e1 ^6 u+ m4 `/ E
| 19.11.2, 25.1 and 25.6/ ]. C# }5 O8 V9 i. n: D
| 60745-1(ed.2) & 61029-1(ed.1)
' i- u9 ~8 x- i1 u1 ` |
+ D$ k9 s; o) ]: gStandard: IEC 61029-1, Ed. 1 / IEC
2 ?8 l- T# r) t3 P3 `1 ~4 R60745-1, Ed. 2
0 A5 O5 r& A8 t. b, L! O( B; f8 G. U0 q9 TSubclauses: 19.11.2,
9 X3 H- U/ o E$ I3 A25.1 and 25.6+ r9 M/ p4 @ v+ t5 v- r7 u& [& s
Sheet n 2632 s. Y* [0 I) O+ x* ]* q1 P0 |" m" X
Page 1(1)$ p1 `" I. a. B2 i. x* l
Subject: earthing connection* V- d& [9 S/ N+ P( Q* r% \$ t
through moving part of class I
! ^; j& r+ W% @ j( Ymotor
" q! M# H" F" r2 E2 SKey words:( i. x: X8 [2 l- [ b
- earth connection,/ n# J" F# |8 g3 b5 ?
- moving part
$ k* w& b$ f7 `Decision n.19 taken( `5 F& w J# H/ D1 W8 A+ S% u% z
at 35th meeting/19981 B- w% k6 l6 m% l- v+ K
Question:: P8 N* D; j: @" g6 T7 E3 r. X9 L5 O
We consider a class I tool employing a universal type motor. The motor shaft is
$ S0 @ ]4 i# t# @conductively coupled to the earthed enclosure through steel ball bearings.' e7 e) F7 {8 k, a
In this case, shall the motor be of class II construction (motor shaft separated from the rotor
' m+ x. W: v0 v; J5 Dwindings and commutator by double or reinforced insulation) ?' M6 ]% v. j, m6 u+ b+ m
Decision:6 L1 Z$ C) o. F3 V) A
Yes, the accessible motor shaft of a class I tool shall be separated from the rotor windings& [5 M0 T; c" D: r6 ^
and commutator by double or reinforced insulation (class II construction).& b) S* w9 \9 ~8 j
( e6 i: p1 P9 _8 C9 y& B- s" X
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发表于 2012-11-8 15:30
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