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ELECTRIC MOTOR CONTROLS 7 b, L$ R4 _2 c6 A5 @$ p% A7 x8 D
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Once the proper motor is selected, understanding the many various control devices available and
& }, `2 M) Y% L+ d# ?their uses and limitations becomes an important part related to reliable operation and protection of
- b. H: {) Y. k( e4 U3 a; cthe motor and the personnel using the motor. & G0 |, }% h: g* v2 c
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 4 [% e& ~: S& h7 k* C+ L
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
( u3 g G/ e& U& w) [. bcontrol equipment can accomplish multiple functions from each of the topics or categories. / Z- S5 @& M9 _/ ~% c2 ]9 }1 k& b
: {2 y( E) |: W9 r5 Q/ Y, oThe four categories include: . }. B! f- R3 b: b5 q+ u
9 ]9 v2 |5 i# I3 O1) Starting the Motor 5 z5 a5 B6 p6 O: T+ w- p
7 l) X A5 F# ^8 Y7 o+ L( _Disconnecting Means
& \% q3 d( s) g6 Y1 g) FAcross the Line Starting ' Q0 h" @: L# b; _5 v0 k7 ^$ }
Reduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection $ `7 h7 J. ]& [9 t4 N
Overload Protection
7 W( F* t+ a. T1 {8 ~5 v2 y& |Other Protection (voltage, phase, etc)
2 ]+ [- ~: O% l& z) lEnvironment & K; i$ ]3 w, H0 `/ j, V
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& p% a* n' L1 l6 Q1 ?' g3) Stopping the Motor 0 v4 q3 `7 ^ U, J0 W( ^9 i
: {, B; g8 [1 t- c9 R2 VCoasting
' g* M: N* P9 W! ~Electrical Braking
5 c/ U7 C% A5 H( |# H/ ]Mechanical Braking
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! }) a0 a" L. R4 S4) Motor Operational Control ( k* C% f2 \/ X4 E$ h
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Speed Control
7 f6 P! ?: @' q- q, w% Q- oReversing
6 ~6 V% }, E% O2 D R- MJogging
5 G0 T6 G& {3 P. o9 t, v) bSequence Control |
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发表于 2009-6-19 21:51
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