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ELECTRIC MOTOR CONTROLS x* z6 M9 c6 h0 j
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Once the proper motor is selected, understanding the many various control devices available and 9 A' l+ T6 I" o) ~% q6 ~1 C h2 u
their uses and limitations becomes an important part related to reliable operation and protection of
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0 x+ o! p( C" V* q+ q5 z$ u$ NMotor Control Topics , k6 b- s. {1 b! f' q! i9 [
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There are four major motor control topics or categories to consider. Each of these has several 1 r) D. {, W' p3 _+ d
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor $ j' N) S# ^+ b* N0 P' }
control equipment can accomplish multiple functions from each of the topics or categories. " M1 f' w1 Q( B* J" w( H
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The four categories include:
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4 Y! _! W9 m$ `2 Q1) Starting the Motor
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Disconnecting Means
6 {$ u9 @. N" Q' ?- XAcross the Line Starting
) s; x% ~7 K7 Z7 l7 s; S. }" OReduced Voltage Starting
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|( O& s6 n/ M0 }2 r4 X: i2) Motor Protection 6 {* [7 A' \* N& f
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Overcurrent Protection . \4 c& y& F9 Y, o8 L
Overload Protection " W! P8 v, N# v* Y+ W
Other Protection (voltage, phase, etc)
( r( f O3 f* HEnvironment
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( t R) I7 B5 b4 s2 U2 k j3) Stopping the Motor
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Coasting
5 ?( @8 h1 r, x2 u5 FElectrical Braking 2 o. J- A# Z* L- P# s5 x. m) B6 I# d
Mechanical Braking . }6 I" `/ I0 d' \3 K5 J( t, r* _
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$ Z& X9 f9 O4 Z# C( d( Q4) Motor Operational Control
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) g) M) ^/ {# I/ I( ?$ U- KSpeed Control 0 T' X3 v9 k) `( q' ]
Reversing
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, J2 l; T4 l8 nSequence Control |
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发表于 2009-6-19 21:51
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