 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS 8 j0 k& D) M) u+ h# W4 [8 g3 L4 U
( L+ x9 S5 i+ F+ COnce the proper motor is selected, understanding the many various control devices available and " r$ D+ a, A; Z6 G7 }( g! t
their uses and limitations becomes an important part related to reliable operation and protection of
@0 _; W9 P/ I1 a# X* U* X$ hthe motor and the personnel using the motor.
# J, B1 A: n/ m3 C( [9 ?
7 G$ j+ U! r5 vMotor Control Topics 7 ?4 `, Z/ c: H, _" f
' R, A: f' A; i, S x! I
There are four major motor control topics or categories to consider. Each of these has several . Y, M0 K- X# A/ e; u. h) y0 g
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 2 v' o# p" \7 v' e* g* ]
control equipment can accomplish multiple functions from each of the topics or categories. + W3 r9 W7 e9 V' p/ _
+ V) @( S+ b% f. E, {( B
The four categories include: 1 P( F" [, _7 J$ W0 `7 D5 g
2 u+ p3 f! E4 a* n
1) Starting the Motor
: t% m7 R+ Q1 |6 h Y$ @2 T, T5 G: v9 i% R
Disconnecting Means 2 Z2 u4 z+ v1 \1 g6 p- N( s
Across the Line Starting 4 V% E7 B# k7 ^( |% b
Reduced Voltage Starting 4 |; m6 X. Q; Y3 p/ D
$ H9 C' J& v, K0 W& Y
; _( z( t5 @9 U; R2) Motor Protection
3 z& t4 c) O: H/ e6 i0 A( q. H5 L6 P) V& v/ A4 G# l2 u' n$ ~6 C
Overcurrent Protection
& q5 l6 n2 N; a& VOverload Protection
( [! ]9 T( N: y% y0 G1 v3 O% U2 [Other Protection (voltage, phase, etc)
+ {7 H5 J) X: X) p, H" Z1 w& _, b) qEnvironment
( w, L: C6 S6 }
- ~0 m7 t/ g1 j' ~: S1 k' E6 H0 C5 K' B" a+ I. }
3) Stopping the Motor
0 b4 w0 i# w5 E1 m
6 U' c Y8 ?2 L# QCoasting 4 b" D% P" S5 K
Electrical Braking
/ b8 I2 _0 a$ T7 n! vMechanical Braking 4 L t" S6 `8 C0 m2 x. ~( g
& a$ o; x7 A, K# M
- G7 R# f0 U7 O' i
4) Motor Operational Control . p. @- s* F! g# Y
2 L" U; P+ B* ^
Speed Control " O; K% G9 Q7 H+ o) n) o- z
Reversing
0 W, V( c0 g6 D# n: @3 s8 ~/ }Jogging
6 U9 b" q" n5 X! L# `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
