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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 9 B! ~6 y1 W9 I* X" G8 X
their uses and limitations becomes an important part related to reliable operation and protection of
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/ a1 g" p0 k* m& ~, iMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
: ], i* Y9 _0 K& o7 nsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 4 _; |& c" x9 ]. L5 Z% ]8 G
control equipment can accomplish multiple functions from each of the topics or categories.
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8 X9 ?$ M6 U* U, _- m% O' eThe four categories include:
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8 b" ?% D( r% ^' [0 x: O) i, C1 W1) Starting the Motor
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Disconnecting Means
) a0 y. Q' b7 [( Q$ n% K VAcross the Line Starting
4 Q8 b% ?& x1 LReduced Voltage Starting
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2) Motor Protection 1 f1 X$ h9 `) f
3 e! l' B9 S# F9 Y8 jOvercurrent Protection
7 o0 Q' i8 U7 ^" D6 ~' Z1 VOverload Protection
# E8 h! q- q9 ]3 ^/ FOther Protection (voltage, phase, etc) ! e+ x& Z4 L. I, f0 n1 [
Environment / _8 J3 {& F' L
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! ?' z4 `% T1 W& t" J* q) i3) Stopping the Motor 3 c6 [+ A: S, r
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Coasting , m9 M' [0 C q* Z2 _7 D4 d
Electrical Braking
1 x3 I' l1 T, }- F1 }Mechanical Braking ) l" Y5 D3 B z) `( W
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4) Motor Operational Control 8 X2 i4 j/ S& v- t
( i- h3 ?* H5 G9 ]. C& ?Speed Control
. X7 o) B9 ?( b8 X6 {& \Reversing & i1 U+ u, ]' H' T) X/ a9 _
Jogging " E: \: R5 a+ ^# s1 k
Sequence Control |
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发表于 2009-6-19 21:51
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