 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS & i3 U/ x( T" C6 e) L+ R3 o
; t/ I9 Z) e {7 s& |# H- x g ?Once the proper motor is selected, understanding the many various control devices available and
% U1 l4 @1 O# etheir uses and limitations becomes an important part related to reliable operation and protection of
. N9 a' k0 r% a) q8 _3 a# _the motor and the personnel using the motor.
) s, w2 ?, _: C& u( D" L5 L
: i. q; E, Z- ~! j6 v) D* i% m1 TMotor Control Topics 9 e! q4 @7 Y5 L5 e. |2 a0 o$ x
5 m1 z8 o2 e* Z+ ?, YThere are four major motor control topics or categories to consider. Each of these has several & w# C' |5 I$ Y( M' s7 w0 q
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor - w; a5 }) B1 M8 \# B% S/ s
control equipment can accomplish multiple functions from each of the topics or categories.
1 C6 ]: b/ o" i2 H1 P4 H# p
4 m D6 o) P/ A& _$ b8 QThe four categories include: 1 g H$ M& T4 g- r0 u1 j8 O+ l' h
* T' A7 D2 L0 W8 Q
1) Starting the Motor ! w* c9 n. t% g9 y! I; `# p- n: m `
# G* \% O. n( @2 V( ?
Disconnecting Means
. T/ D1 O1 y: d( N8 r) D$ G/ M3 FAcross the Line Starting
3 D5 t8 ]9 t# |3 e% n& I2 BReduced Voltage Starting 1 M0 P ~* c1 |% n" h
. Y( i, L- t G: Q( @3 l
+ Y( F' x' k: p; I2 o3 V2) Motor Protection ; t5 Y8 f4 z4 M$ K- b' h: r
; o" q+ b! i- t* t6 l; S7 _9 s7 ROvercurrent Protection
7 L8 \) B" k% o" S+ kOverload Protection
I0 Y& K! b. M3 @& JOther Protection (voltage, phase, etc) , M/ m: @2 j- F Z/ `
Environment
' D1 H( l& Q% n4 A; {7 A4 R1 [, W. {. `( ~% K
% q; f0 p3 i7 x2 g' ]5 }
3) Stopping the Motor / x) o- V8 Y* X/ y5 h7 G" G8 o$ J N
+ q* t' ?2 @. jCoasting
2 g/ V* [6 U: N! sElectrical Braking 9 V' w% f& @* V
Mechanical Braking ! [ ]6 a# t3 O6 S6 }& U
. v9 S: K: |0 k( ?& Y
0 b L* J! T) |8 L; b0 P
4) Motor Operational Control # V& g2 E1 e+ i V. P, C2 Z
. Y# Q% k1 V2 a7 J* ~3 w
Speed Control 9 n. B1 Q3 l0 n! r) e C6 ^
Reversing
% w# Q0 D% a* l: \Jogging ! C8 E) F: f( M7 k4 F
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
