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ELECTRIC MOTOR CONTROLS + l8 i3 f; E3 a2 ]1 M! A
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Once the proper motor is selected, understanding the many various control devices available and 5 f6 b: n9 E3 s" C
their uses and limitations becomes an important part related to reliable operation and protection of 0 g ?" f4 a3 {/ ~( X8 r% C
the motor and the personnel using the motor. ) Y9 v/ }! q/ K, Q5 }: N
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Motor Control Topics - k' {' K. j! k5 S( [
% Z) j& l* N& x. u0 \/ n1 b8 yThere are four major motor control topics or categories to consider. Each of these has several . `! X5 M1 B* S' J4 U, H4 F% S
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ; w- s U- z$ Q2 y( x( Q
control equipment can accomplish multiple functions from each of the topics or categories. 2 w" t# F, q4 M# @2 J1 ~& {
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The four categories include:
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1) Starting the Motor
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Disconnecting Means
+ y/ ?1 |+ F1 i, i( x. [3 ~6 iAcross the Line Starting & |3 K6 p3 U% \ N/ }! x2 o
Reduced Voltage Starting . |# ~/ y! v$ s* S6 Q# c& ^1 P
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. o! a; L+ w& U1 m$ r9 H2) Motor Protection
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* g9 m: K6 j+ G M6 jOvercurrent Protection
9 B. Z+ v$ c5 l* _. H# r4 a/ pOverload Protection 1 h" r5 `* }- l2 G2 N) w
Other Protection (voltage, phase, etc) ) f* | e# A) ~ l8 K4 Q3 B$ f0 p% X) R
Environment $ p% X0 e, ?9 o/ H2 m5 G5 |
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3) Stopping the Motor # l/ f" H" h+ d& j# [9 P+ T* U+ }
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Coasting 9 o3 [3 g1 i! P5 r5 K, m% y
Electrical Braking 1 A# x3 P, X ? D
Mechanical Braking * a1 Y+ T& B3 ?' N( Q4 K( O- ~4 [% m
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4) Motor Operational Control
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Speed Control
) B' _# B) X: @. o! qReversing
7 [. g% f1 N2 ?% F5 }Jogging 1 p2 j. \5 {% E2 Q: N/ ?6 D
Sequence Control |
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发表于 2009-6-19 21:51
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