 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS ' q, K$ x! Z1 I6 p9 H
1 W7 q4 A' X9 W) d
Once the proper motor is selected, understanding the many various control devices available and
3 b: t. N. a' D$ A0 K. G8 @9 Stheir uses and limitations becomes an important part related to reliable operation and protection of 9 q0 t/ s2 Z. f
the motor and the personnel using the motor.
# [' r L2 ?9 n& U, z% m# S. p' d# w
Motor Control Topics 8 h& o; h/ ?3 p( D+ j# U) t
9 g; K) {9 u+ q% }; L# h
There are four major motor control topics or categories to consider. Each of these has several - I$ V9 m9 Q+ s+ K8 v+ z
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
5 `& y3 ?4 L$ n& w7 lcontrol equipment can accomplish multiple functions from each of the topics or categories.
5 W2 ]* T/ U8 Q4 u* s5 H6 P9 `$ v/ p3 h+ M% C" a) d- S# z3 f z) |
The four categories include: & O0 S7 j1 s8 J1 D+ _5 c" ]
( T( w: e1 ]4 f- k" B: Z
1) Starting the Motor
! e3 l6 N- @: l5 e1 N: ?4 P" u3 N
Disconnecting Means + k8 [/ l) z3 ^4 W9 k" D
Across the Line Starting # C& N: n' _1 R- S$ t& F" z7 @
Reduced Voltage Starting 1 _& [& l- D6 C) ~$ Z. b7 @
z+ P0 Z/ u# X0 T( b F
* S* D3 C, g) W! ~
2) Motor Protection 3 W4 C) }0 p/ S9 T3 ^: { |7 K
% Y- g6 ^& O/ DOvercurrent Protection
% p. n: g/ r3 dOverload Protection 7 Y; Z9 U" Y: \/ ]
Other Protection (voltage, phase, etc) 9 Y9 b+ c- L: S# g/ c5 z
Environment
9 F* U W) I& K/ A' b4 N
9 y! {2 q+ L7 r! F+ m- a# C
, |0 D4 q* h1 F3) Stopping the Motor
5 @% G+ r9 K; ]2 F* m& R- {4 l( N m( O( w" o: x. s1 F
Coasting
0 }! }( @3 G6 vElectrical Braking
. p- `" K# E- ?4 BMechanical Braking 3 k/ j. Q/ q/ x3 ^0 U
0 t; v. y0 s6 F, h: W9 k, y; w* w, J! p4 e, b m
4) Motor Operational Control
5 \$ m5 P+ O7 E! v* G# @- X+ n/ c8 a |% g
Speed Control - O( E0 [ Y1 j+ o& }
Reversing
' B* `* P( ?% M! DJogging K0 x; c, ^7 i4 U
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
