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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and
0 K9 T" }2 P, e5 t% I9 ?their uses and limitations becomes an important part related to reliable operation and protection of
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1 a. a. h+ Z0 s. ?/ [( xMotor Control Topics 4 g7 V( ~& Z- q# d- T2 |( d
- A. r1 u D2 |/ z0 B( X, iThere are four major motor control topics or categories to consider. Each of these has several ( i0 M2 Q9 o' Y) Q7 {# L$ m f$ \
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 5 X7 ~# v6 T7 |$ x
control equipment can accomplish multiple functions from each of the topics or categories. 0 w' L( f A" p5 a
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The four categories include:
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9 p8 z+ f' @; b2 G* K* h/ ~. w7 G1 z1) Starting the Motor
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3 k! k0 N. _0 E/ bDisconnecting Means ( N$ \0 o; x5 v) b$ j
Across the Line Starting 3 s" h3 U" `& p* f
Reduced Voltage Starting
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- X6 x ]5 r; K% r6 G, R2) Motor Protection 4 ? t$ W, d& W9 ^0 E4 _5 n
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Overcurrent Protection
6 s% {9 t8 ]! A* v/ oOverload Protection
+ }0 G6 V3 P5 H) XOther Protection (voltage, phase, etc) 1 p$ ^5 w6 \3 Y' a& o
Environment
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3) Stopping the Motor
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Coasting 7 y6 J5 z4 k. f
Electrical Braking
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4) Motor Operational Control * O" K) h6 Q# r. p W8 o5 c
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Speed Control + R- _2 l8 S2 G Y0 J, |' z) z
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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