 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS
# x3 B& q. K! w9 u, d; o
+ s% D0 p2 t) L( w. e6 GOnce the proper motor is selected, understanding the many various control devices available and : c2 ~1 P1 {7 `& v% g, i6 U& @
their uses and limitations becomes an important part related to reliable operation and protection of
W+ O. `+ e# ~ s# P* `' Nthe motor and the personnel using the motor. " F- k! ~4 @* f/ D5 y" M
3 B* `7 w8 S- _! iMotor Control Topics + z$ T- q( C8 \) ~* X3 L
. r z" P8 F/ ~5 b) kThere are four major motor control topics or categories to consider. Each of these has several
6 ^7 ~" a' K$ nsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor $ l0 w& ?% F7 ^+ D/ Z8 x* z
control equipment can accomplish multiple functions from each of the topics or categories.
8 t. m5 o7 V ]
( g# H/ M4 x- w" M) RThe four categories include: 5 `( Y1 X! O1 S! Q6 n
7 V/ k& _; c! B% z. r+ t8 M1) Starting the Motor
/ x u0 Q) j) H6 N0 F9 @
% \" {# j8 Q6 E2 K$ Y# NDisconnecting Means
9 ^$ Y+ s$ d$ V( n, z! Y8 uAcross the Line Starting & c3 Y+ {, Z$ T4 j
Reduced Voltage Starting
& r! s+ ]* V: n; o3 ^- ?- D M& p: v5 }1 O5 r1 V6 }
: C! h$ i; K1 f# o+ p2) Motor Protection
0 D' F i( ?& b( p' h; U. z/ p) P5 c- e& d: e7 p' f- z
Overcurrent Protection ! o5 ? P# i9 [- j( }9 g
Overload Protection
+ i7 q l+ p% KOther Protection (voltage, phase, etc)
7 q0 u$ t9 A: j/ T2 ~Environment
4 \* o- A0 F, r5 N' N( S* _; b+ R7 Z) x2 l0 ^: L/ |5 i
: J' p& `7 O2 [& k& `
3) Stopping the Motor
( ^. E ~6 S A6 |
+ a8 [9 E* E$ j" c6 b' L& HCoasting
/ _8 V" b i* jElectrical Braking + _2 J! R, q6 B6 x6 F
Mechanical Braking
1 H3 s$ s9 @7 L) H- O$ \$ A- t% H8 d$ X
* G5 A+ J0 n( ?) t2 x
4) Motor Operational Control
" M: A) ]; g' X
2 o) Q( b, v. Z2 ?9 q3 k8 PSpeed Control
$ a9 H) ]' ~* q, P y1 E; LReversing
2 M8 Z/ K6 A; P1 y# g0 k6 HJogging
/ d) m, a% J- t# M# M' _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
