 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS , b$ e7 s/ L2 q: a: [
/ p N) ?! r* c g7 I) M9 D I4 v5 i
Once the proper motor is selected, understanding the many various control devices available and 8 a% p D: I' b* |2 b+ S" N* z
their uses and limitations becomes an important part related to reliable operation and protection of $ |7 T/ g# a" j! V* `" J* W; ?4 n2 Y2 k
the motor and the personnel using the motor.
" O N$ }) d% X' K+ D2 T
( ]+ I$ h: O6 i0 z4 i/ }4 H2 dMotor Control Topics
/ @( B# O' U- S) q' f3 {! F8 C. j( D8 }4 \: N) r
There are four major motor control topics or categories to consider. Each of these has several
# `# G# C7 R$ e9 \- v- ]subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor * r% C: I/ u& h; k9 c- B, g2 v+ j
control equipment can accomplish multiple functions from each of the topics or categories. 4 O+ F, M# u: T# I4 R
" @0 I- `2 x. n$ Z+ J( u0 u5 j k ]
The four categories include:
/ J" f2 e9 y. M+ ]4 g. w! O0 D$ m9 f- ?$ |9 I
1) Starting the Motor
, c- j( X# R% L9 R* G1 Z9 b1 j T) P
Disconnecting Means
# F4 r! I* V: t7 P& f3 z! H% {- }Across the Line Starting
! N1 b# u. k. N! h% a tReduced Voltage Starting
$ {! f" l4 H# m/ M
' e+ ]: k6 U6 y; N5 ^9 M$ l) |: x6 U) C
2) Motor Protection 7 \( {; A) k% k6 J
3 G5 Y7 z+ i3 h* ]' Q! L9 \, r
Overcurrent Protection " @( Z _: g2 E7 o
Overload Protection
5 p: D" [. G9 g) v9 N) m6 }Other Protection (voltage, phase, etc) ) D7 z7 i0 L$ d# U5 {0 ^! g
Environment
/ {) B9 `5 [ p3 s0 \6 w( ~9 M4 Q8 k2 m
: S0 E- u: M: X' h, p. S" O$ v" C
3) Stopping the Motor 9 P P, D' V. U* X/ a6 i
% s) t3 R# ^' uCoasting ! r& ]0 z8 d( G, R+ h3 O
Electrical Braking
" L6 N8 \' \1 c2 }$ c/ r, a2 o* WMechanical Braking
% f- g) N2 J5 n2 O# w! l# l# @, z) w7 }% b
S* I5 A3 n( c# g% q6 G5 {" Q! ~
4) Motor Operational Control
6 l9 P0 V. W2 m2 Z O2 v: |) J* w- t ^! B8 U
Speed Control , q, _4 }3 M- [- S2 Q, o
Reversing 9 F8 l7 B7 T) e1 c' J. j7 V
Jogging
: p5 L/ |. I* u* PSequence 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
