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ELECTRIC MOTOR CONTROLS : d% }* f, J6 X6 W. ^& Y( b
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Once the proper motor is selected, understanding the many various control devices available and
3 N4 o8 U I! P8 ttheir uses and limitations becomes an important part related to reliable operation and protection of 8 R1 f% H4 }+ Q: M4 U+ I0 ~3 f
the motor and the personnel using the motor.
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- U `4 t x1 k+ E- _" _+ fMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
* U1 |- C& w: w2 V0 @subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
/ n4 Z$ w) \7 y+ M2 Scontrol equipment can accomplish multiple functions from each of the topics or categories. ' R4 W" z" b8 Z
9 \+ O) U* S& [1 B: uThe four categories include:
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1) Starting the Motor
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) G% T% S' `& W$ T2 V+ x9 {2 D$ pDisconnecting Means
* ^; Q2 G/ B6 C+ v0 J, ]& BAcross the Line Starting
0 R$ Y6 n0 d* ?! U# n0 DReduced Voltage Starting ) N& A6 m+ O: P& U* R2 }+ j
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' c" ~# l% G; i' c% ~2) Motor Protection 3 f6 c7 `4 O3 n
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Overcurrent Protection
/ ]& D: g4 m# c6 y5 bOverload Protection - W2 ~6 U* f; G5 u
Other Protection (voltage, phase, etc) 5 F% @5 V3 n$ B) w' [
Environment
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3) Stopping the Motor : O4 Z0 y7 q3 U4 m' Y$ ]
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Coasting
3 I+ m- k" I& ^0 GElectrical Braking
# Y. z( Y z# u" n" ?! {! dMechanical Braking
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4) Motor Operational Control
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$ H0 [" x" i5 Q( T, }Speed Control 4 W m A+ f* S: f5 }- a
Reversing / |, X( H- ^8 ?/ ?. I ]
Jogging - `- q; n: |& G$ f, i R
Sequence Control |
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发表于 2009-6-19 21:51
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