 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS
# }- Z# ]/ W& A" U4 O. S- T
' E0 D0 d6 r6 V' M7 w4 hOnce the proper motor is selected, understanding the many various control devices available and - K) |; c% _4 B9 V6 A2 V% L
their uses and limitations becomes an important part related to reliable operation and protection of , t/ M1 @7 ^& I* j3 ?6 ` L( P
the motor and the personnel using the motor.
9 z0 E/ q3 x* E. H
# o3 w, R) r t' qMotor Control Topics : n% V( ?! r6 v4 i- Q |
0 }. R+ H b- {$ w0 F
There are four major motor control topics or categories to consider. Each of these has several * }% ^; [0 f2 o) k; |2 D+ n
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
D; Q$ ?; F( r1 l. j) ~. gcontrol equipment can accomplish multiple functions from each of the topics or categories. + I. H' I) ?; Q
- O D# e$ x5 V
The four categories include:
3 K* r" I2 J; [, Z8 d1 W4 r g8 C# t& q j) [" N" Z
1) Starting the Motor / }6 w5 d" z1 E( g9 {. g( m8 R
& `+ F! |/ u+ A/ D9 X
Disconnecting Means
' k) ~$ r! [7 W, A! W6 Q$ h, l+ bAcross the Line Starting
: k3 J: L. h' p# `) o& z2 TReduced Voltage Starting # y4 X4 ~' t5 H8 c0 @9 f
5 g$ A/ c; n0 v: V: |" D0 q, T4 K8 F; o: A) q6 v5 n
2) Motor Protection 8 y* X2 G# z9 ]/ J' Z' a
0 U( @- o) U5 Z6 j" j4 qOvercurrent Protection
! l: }) l% d9 M2 \8 yOverload Protection - Z L" F; m6 U+ B0 k
Other Protection (voltage, phase, etc) $ l; m3 O, \- k6 K+ ]# t
Environment , b9 T4 l5 |; A$ i8 Q
C/ ~ U, o: F$ O9 A8 F3 x! h
% e/ }3 S! y$ U; R/ ]
3) Stopping the Motor
6 c3 W) n; b& c- K; |' C* U( c3 K B# X' z
Coasting
( ?$ E, ^1 x+ m* aElectrical Braking
1 }* Y* |/ U9 H6 sMechanical Braking . _ r* Q8 r6 u( f" ]( s
+ P" j' X7 ?! p9 w' j* @0 X0 }
( r9 R3 v7 g* x9 T. V1 \4 g4) Motor Operational Control
" w( q9 V5 b8 i; {" k- A# a9 e
Speed Control
7 h& a3 X1 B( ?- i) G U; lReversing $ ^* \5 T) {' }" d0 q _
Jogging
4 k5 c y; @5 b4 F2 _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
