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ELECTRIC MOTOR CONTROLS
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. w* s& Y. X, U8 ^2 h& v5 eOnce the proper motor is selected, understanding the many various control devices available and
" J) D2 |2 g* K+ b' @, U7 |their uses and limitations becomes an important part related to reliable operation and protection of
1 l9 I( H, V# D; Gthe motor and the personnel using the motor.
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- L# V. T: _$ _. X/ ^7 _7 _' M( ]Motor Control Topics
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; Z6 y% k5 T3 v& e/ j3 VThere are four major motor control topics or categories to consider. Each of these has several
% Z3 U7 Q- j$ ?% q: C8 Isubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
( ~3 G$ ~- t8 D8 [' z) ^control equipment can accomplish multiple functions from each of the topics or categories. 4 V3 ^# | [. M
8 ^3 i1 I: u2 i( Q. tThe four categories include: 5 ^# _' X$ O5 N, _* V6 N) M4 N4 [4 L
1 d6 o4 f& D0 z1) Starting the Motor
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Disconnecting Means
! p1 d: W. Q) J4 |# m. GAcross the Line Starting
, X( D# I5 \2 v6 \ h+ kReduced Voltage Starting # |( X8 r# Y& a
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] N# ~% N; K2) Motor Protection
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Overcurrent Protection , t- h+ z8 w0 g! I) J
Overload Protection
. u/ |: Q# T1 ?+ v& M) b" WOther Protection (voltage, phase, etc) , b8 d3 s h8 ~2 t6 b
Environment
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3) Stopping the Motor ( K1 L; s! K9 P
% N4 T- B4 t- \Coasting
4 t* N+ p" V, UElectrical Braking
! X& F T2 l/ P- `8 N% _5 nMechanical Braking & Y$ R* x7 W3 ~& `
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4) Motor Operational Control . Y2 }; |; v8 A9 E
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Speed Control
1 U+ J7 |0 L+ [+ g( H0 T( TReversing
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Sequence Control |
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发表于 2009-6-19 21:51
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