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ELECTRIC MOTOR CONTROLS $ S n9 f& ^: A
( M. ?; u5 \) L0 `4 OOnce the proper motor is selected, understanding the many various control devices available and
, m% ]' a- O# _, q' l4 {% htheir uses and limitations becomes an important part related to reliable operation and protection of
+ V4 d8 g/ a6 U9 qthe motor and the personnel using the motor.
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* |/ @4 q* K7 ^Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several " g; g. p4 x) |) F& ?: |) S2 P
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
5 ~* i3 w: Q( ?7 O# Zcontrol equipment can accomplish multiple functions from each of the topics or categories. 5 W c7 P" H) ]# M5 n
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The four categories include:
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1) Starting the Motor 6 n8 b& ?3 ?% h
E- C- y8 Y! e" p* N7 {) ?" LDisconnecting Means w2 Y9 Z# q. K. L/ R2 o
Across the Line Starting 3 F+ i; o9 }/ A" |
Reduced Voltage Starting 4 o$ t- D( E. W
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, [. c4 e3 e9 Q3 ]5 x0 X2) Motor Protection
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Overcurrent Protection
2 `% x9 O0 B2 a8 X# uOverload Protection $ Y: r4 M5 l* b( r# S# S
Other Protection (voltage, phase, etc) 1 G0 t6 o1 P7 n; @; a Y0 F
Environment ' A2 [+ V6 T7 }" W' U
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3) Stopping the Motor m# G! s' t- T. @% I/ t' g
# e* O* C3 D% _* u* ECoasting
! O% f0 q$ ], J. n& D5 z9 S3 PElectrical Braking , D& j" G) v+ a( W4 X2 |- H6 x
Mechanical Braking # m7 A) J% d) r' M4 z0 ~. A* ~5 U
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4) Motor Operational Control
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Speed Control * E/ L0 b( w8 e s) O
Reversing 2 `( F0 m: D# @" q- p9 y, t+ |; }1 P
Jogging
1 V! L; A1 x* w, U+ l2 E5 {Sequence Control |
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发表于 2009-6-19 21:51
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