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ELECTRIC MOTOR CONTROLS
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+ T" K. |" u1 M: m; I9 YOnce the proper motor is selected, understanding the many various control devices available and
& l) \! d0 s9 @3 M8 i! b: Itheir uses and limitations becomes an important part related to reliable operation and protection of
% \# T# q1 A+ F" _the motor and the personnel using the motor.
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
" a' a' n& N0 o( b2 ~) K. @subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 8 @. f# u& o: p( p4 D2 d; z
control equipment can accomplish multiple functions from each of the topics or categories. " p! }# }6 B5 ? M# K
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The four categories include: & B9 j' O3 h6 a) t+ |
3 `1 h% f. F* t" m8 W1) Starting the Motor
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6 A# z% F+ D! @% bDisconnecting Means
# a. C* p0 q! C: HAcross the Line Starting
7 C) O; r, R# f; ?) F2 \+ NReduced Voltage Starting ' [$ Y! z6 K: z( Z
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3 Y$ z3 t, N7 C2 i" E2) Motor Protection
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$ i- h2 ]* ~+ t. D# r- k' e" HOvercurrent Protection a: P9 z8 }1 W' \9 k' u
Overload Protection 5 Y2 O! s. }4 M- ]+ [
Other Protection (voltage, phase, etc)
8 w. G" I$ l- [* G" MEnvironment
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3) Stopping the Motor
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2 p; B6 O h R% ~& R+ UCoasting
9 h! B# s; C* NElectrical Braking ! s" ^( J% R' h$ o
Mechanical Braking # a% q5 a- r2 @# e& i
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4) Motor Operational Control & `: }$ K0 |0 Y, ?( _
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Speed Control
9 Q: X7 d( ?" t: {- \+ }Reversing
. t: }3 }; [6 ]9 t4 TJogging
5 q3 t1 n3 I0 M( bSequence Control |
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发表于 2009-6-19 21:51
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