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ELECTRIC MOTOR CONTROLS & H9 q" C( z% h5 o5 T
% \' N$ `, x( E- a3 k: DOnce the proper motor is selected, understanding the many various control devices available and
8 e4 k. w- u# v( r# qtheir uses and limitations becomes an important part related to reliable operation and protection of 1 r1 j% W2 s" L c- k9 P r
the motor and the personnel using the motor. w+ b/ C. z/ O# Y) N( d) k
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Motor Control Topics
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) {& {6 B# `" K. C9 g1 n3 g; I0 aThere are four major motor control topics or categories to consider. Each of these has several
# d9 c- r9 e0 l) Jsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ F4 g. v# P, b1 B/ B `9 ccontrol equipment can accomplish multiple functions from each of the topics or categories. 7 f! d2 g& V5 _+ s
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The four categories include:
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9 {8 ~6 O" m9 ? s1) Starting the Motor
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Disconnecting Means ) A. ~# I) k x8 s/ g v6 V' k6 v
Across the Line Starting 2 f. `) S; |& W8 @
Reduced Voltage Starting
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7 y7 P4 c' V' P$ d' ~7 A7 |2) Motor Protection ' P0 S5 z, U2 P/ _* w* b! B$ ~
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Overcurrent Protection
j- s9 ]0 @" X3 JOverload Protection
- p/ }- a( C& w' J9 ?: u; kOther Protection (voltage, phase, etc) 9 n. A7 l _% \/ c: j. y
Environment ; k. w# S0 J1 Y& R
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3) Stopping the Motor , X+ A. _, P' I, [
6 f; n$ ?: v! V# vCoasting
" R/ b" y! ]; mElectrical Braking ' l1 C" H) `: \& Q9 l E c
Mechanical Braking
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3 ^! Z7 }+ b1 r# ~4) Motor Operational Control
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Speed Control
# N1 \( y; @ ` @, tReversing % |2 y, r" X, O/ B" ~- v
Jogging % F* d9 w; W5 t( Q, h
Sequence Control |
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发表于 2009-6-19 21:51
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