 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS 6 y, I& a" o; Z7 b/ s& j. F M& x
, U7 R& w# x( L% j9 X* n# a' SOnce the proper motor is selected, understanding the many various control devices available and - @6 U9 ^6 W: N1 \$ x
their uses and limitations becomes an important part related to reliable operation and protection of ! Y2 }$ D# p' C8 S, y
the motor and the personnel using the motor.
8 R& z L) h5 _& Y. T1 R, N" r1 v! n* m" Z6 x& s
Motor Control Topics
- F. P# c4 g5 m& c" P" X5 \; N: s% r; _5 e9 N0 V
There are four major motor control topics or categories to consider. Each of these has several % t$ N2 {/ j# [/ P+ `, w
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor # c7 O: S3 t$ n3 u
control equipment can accomplish multiple functions from each of the topics or categories.
6 B6 o) S5 \3 _5 O W3 {% e
+ Q+ z3 a% ? e/ N$ RThe four categories include: , Z3 v. p# j0 O" I) ]/ Y
" Q7 f- g$ Q! h6 D
1) Starting the Motor + p- a/ h- i! ^7 G l/ E% o5 e
: e L0 }5 H( Y/ x% U& h1 [; K" XDisconnecting Means ! h* ]' v8 G7 N9 E% Z4 I- R
Across the Line Starting * Y0 g. u& f6 f5 S. L
Reduced Voltage Starting 5 v a/ o* I6 O! ~
# A2 c8 J; [ Q- p* G0 `% `. E* T
% b$ s" p+ A. J8 p2) Motor Protection 3 J% X% b4 n1 z5 B. x( z
# w# Q5 A; o( F- h j) g% AOvercurrent Protection
; X. O' S* @% v0 i6 F: XOverload Protection & ^8 }6 I* c4 z# ?; z" y3 N8 [
Other Protection (voltage, phase, etc)
7 u. A: [& L' f+ GEnvironment
4 Y5 G1 `3 @$ i% o' R$ K
4 i& {! K' f7 \ k# o* Q
2 m x2 w$ ?. j o' b8 G3) Stopping the Motor
- X Q: `2 y! l- P9 D7 k
: G# o4 G5 u- f) V- Z! ICoasting 2 B" @! }8 d8 h: X# e4 X4 s7 v
Electrical Braking & L$ [) k+ N6 c% {1 t/ Z) O
Mechanical Braking 7 z5 _! q2 ?, R' ]1 J) O3 J
( ~& N `( n7 n' O5 _& O
3 `. t- b# B4 D" E9 S( k& V4) Motor Operational Control 4 m" ], W/ h1 _$ D, V& H/ D( R
- ?$ Z9 c1 d ~& S/ {" `. aSpeed Control
1 l& `$ T9 q3 L1 JReversing
/ N) s! M" `+ A5 b9 ?Jogging * k1 r- v$ c3 {) z' o- `
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
