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ELECTRIC MOTOR CONTROLS - g3 Q$ p! w0 r. b& }5 J' C
X2 a% k" [) }( X+ d! h- qOnce the proper motor is selected, understanding the many various control devices available and " P# Y. r" V) b2 w% K
their uses and limitations becomes an important part related to reliable operation and protection of
- O/ x5 r( `# y4 Y/ Z3 ?the motor and the personnel using the motor. ) r" g7 n& b5 p2 k% l
& X5 w$ W3 b P9 SMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 3 {4 B: u# p' }: \7 @% o/ A
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 9 Y4 ^+ @ g2 C2 g+ ?: l
control equipment can accomplish multiple functions from each of the topics or categories.
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( z; V: t x1 m+ t6 H, Z7 HThe four categories include: & C" ]# g, `& r H
# P& `# ~, U8 Q+ R1) Starting the Motor
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0 {. a7 g/ o, `' [% k( }# C- V/ {Disconnecting Means
$ `; k8 V7 k. V3 w' B: }Across the Line Starting 0 x8 u8 L S. t; h( V8 Z. B2 _
Reduced Voltage Starting
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) v; |, W: A# z9 _, |/ p7 ?( T: l2) Motor Protection " \% l/ ^2 v0 }1 p
) M2 S+ |' w; @9 w7 w5 Q$ V/ iOvercurrent Protection
* V! @7 T r5 s' ZOverload Protection 1 X- p" ^! s% P7 D
Other Protection (voltage, phase, etc)
" N* d/ ~% M! b& p8 j% a4 J1 DEnvironment 4 ^# U7 t8 u, k5 v& [% g0 [( i' q
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3) Stopping the Motor
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- D7 Z9 S( `5 C6 xCoasting % Z7 {3 c1 n8 w" W- C/ r' }* x
Electrical Braking
7 s: L5 [2 e4 q4 a- e' bMechanical Braking : r% z; O! a; v- v' v+ `6 N
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& C- ~: u ~: I p6 V" f0 Q! u2 C3 O4) Motor Operational Control
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Speed Control 3 t7 C( g) Y. r& H+ B7 ~
Reversing & X2 q# `2 y- K: u
Jogging 2 Y. r8 H8 S4 v8 [
Sequence Control |
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发表于 2009-6-19 21:51
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