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ELECTRIC MOTOR CONTROLS + q' {* H' R- o# d1 R$ t
& {6 \2 L7 N0 f) y0 a, ^6 JOnce the proper motor is selected, understanding the many various control devices available and 1 l: ~8 q6 M- i3 j5 Q/ d) d% p3 T R
their uses and limitations becomes an important part related to reliable operation and protection of " f- X8 q6 f S
the motor and the personnel using the motor. 0 Y- n, j. ^# Y4 _4 h
2 M$ [9 s9 k* k. dMotor Control Topics ( Z: C* C# I8 ?1 x4 X
* {( Z1 Y' e2 N7 K q8 [There are four major motor control topics or categories to consider. Each of these has several
1 v' ]- b5 f) j! x1 Y; l, vsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 Y: _% [+ D: P( t+ mcontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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3 q7 n3 f1 a# x$ M. L. w1) Starting the Motor # b" w# i/ l+ j @* s
; o+ i0 E4 L6 k- @* c' {$ M- J' |Disconnecting Means $ z' D7 w$ z0 W! Q0 S
Across the Line Starting 2 Y2 ^. d1 W- b* K0 K' j6 {
Reduced Voltage Starting
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. J- v$ C5 T" f) `2) Motor Protection " y% O; L s1 y6 a9 K. N* C
5 s1 ^0 J# B' W2 dOvercurrent Protection
, n C! c8 E3 K# Z8 a) SOverload Protection
: p/ V( N1 w* }Other Protection (voltage, phase, etc) N' h6 W8 Y; |" N+ t
Environment
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" _, U5 a+ r, d- D9 u* h* V; P3) Stopping the Motor
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Coasting & k# p8 q! u, E" o Z. N
Electrical Braking
$ |. `/ b2 @. l5 j5 P, vMechanical Braking 6 v2 U" w; f! X1 a! ?6 i
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4) Motor Operational Control
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Speed Control # k7 @8 r- c1 l' d
Reversing 7 ?, S+ B6 u1 S' _
Jogging
3 N% O+ Z0 _2 _; b% D9 I7 k D0 J- R7 CSequence Control |
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发表于 2009-6-19 21:51
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