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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 ; U1 Z5 A% j; |0 }
their uses and limitations becomes an important part related to reliable operation and protection of 9 ~3 z' v# G0 X7 N* k" U
the motor and the personnel using the motor.
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) V; X3 P0 U, n: J/ x( ZMotor Control Topics . K; n- e: r4 Z2 w, ?( ?' w
& k- z6 U' @4 \There are four major motor control topics or categories to consider. Each of these has several
J9 V. `( S, b5 ?+ F& W1 asubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
4 _$ z# t$ F, V5 L( i/ v# X3 Y, ccontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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3 s) e& U4 l+ F7 l5 l8 r; a1) Starting the Motor
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Disconnecting Means
+ l, L s, z. L! S' }Across the Line Starting
" T& o) N5 v. d1 u% A; AReduced Voltage Starting . C1 T% }' [* |$ l- _
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' c/ V s) B k4 O$ C2) Motor Protection
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3 R" S9 `& {/ B/ pOvercurrent Protection + @% m [/ F j2 M
Overload Protection # D" r+ F$ b* b X
Other Protection (voltage, phase, etc) * ?7 H* i& o' W. G5 \/ M/ n
Environment
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. _" I% C5 F' ~3) Stopping the Motor : ~3 N0 u9 R5 y/ o: E( }" ^- z: {
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Coasting
8 n2 C* {! B7 |3 z, K: KElectrical Braking - }) g) }% E& d* ]# T) ~7 @
Mechanical Braking
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$ S9 e* P5 _' x% S/ `4) Motor Operational Control
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Speed Control
" P/ Y* A3 S0 O3 a/ s& v* ZReversing ' s$ J. H! l8 A2 Y0 k U
Jogging - ^2 _& m1 \/ J, ]# y
Sequence Control |
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狗仔卡
发表于 2009-6-19 21:51
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