 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS 7 K# e4 R0 J8 R5 m
+ t) e' Q2 {* {- p& y; JOnce the proper motor is selected, understanding the many various control devices available and 0 b/ c I5 }: W9 ~1 c) L
their uses and limitations becomes an important part related to reliable operation and protection of
( W5 T% n( f1 ^; _* Uthe motor and the personnel using the motor. 2 Y) O+ W7 x$ K2 n" P( h1 s
* x" e# v/ M. fMotor Control Topics
/ C& g& r* x) {9 L2 m
: z9 }( l6 e3 @+ tThere are four major motor control topics or categories to consider. Each of these has several
0 L1 }' d" o$ Q0 ~8 }subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ( R1 C4 F: c9 f E" r
control equipment can accomplish multiple functions from each of the topics or categories.
" t3 f4 L4 Q$ L% O b8 `3 }! s/ Z9 \' K+ O. M7 [
The four categories include:
/ {3 j4 z7 d% K+ C9 T$ d- k6 E
) b4 E9 g3 ?! q" m, {; d! b$ j1) Starting the Motor * ]) B5 ~3 n m! u m) j( F
3 z* K% h2 h: T+ n4 ]Disconnecting Means & B9 U* f' o$ {- v" ]% W7 _4 t
Across the Line Starting
7 J3 r6 _3 C7 w. V2 S5 ?0 RReduced Voltage Starting
8 }( }% N) Y: S$ j' _! a0 G. G& ]% y7 Y5 N
: @+ h6 s( i9 a/ Z0 j
2) Motor Protection " ?; F! L9 b) u- j0 B2 `7 @) F
* a( G( A/ A1 Z! @# n% J1 b. `Overcurrent Protection
) d1 o h8 N% Y+ J) n y! U" d3 `3 J% wOverload Protection 1 z* j8 I/ k4 K, e
Other Protection (voltage, phase, etc)
1 X: f% U2 D3 G( N: wEnvironment # q7 s4 J( H6 n: N" a
6 K1 l& l# _) h& p$ z3 @; S2 S* G( p, y6 W7 u8 h, }3 p, m: [: ]
3) Stopping the Motor 1 h; y8 y5 E- C# S
/ r+ [* X0 u% q( |& R4 G8 B& JCoasting + ^' n( g6 _- |- E9 q6 W- _- A: l" P
Electrical Braking
+ [9 y. ^/ S- X) H0 ^6 @Mechanical Braking " X: p0 b+ q4 `9 K" [
, N* G: k: m4 E: k
6 ^- c6 i+ _ K& v" c4 C1 c
4) Motor Operational Control . e. |/ W# p( H* g) Q3 J% ?
) k6 ^9 p. V, `# W, n% x) |Speed Control 4 d3 A3 F# w% b% @/ F
Reversing & z n% x, Z$ Q, Q3 ~) P
Jogging 6 M7 R m4 y; f* i
Sequence Control |
|
狗仔卡
发表于 2009-6-19 21:51
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
显身卡
楼主
