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ELECTRIC MOTOR CONTROLS 6 g, A: O; I) \
: E0 t U% b: jOnce the proper motor is selected, understanding the many various control devices available and ' \# g4 |& x. }
their uses and limitations becomes an important part related to reliable operation and protection of
$ C; E9 F4 r6 S( ?; G7 ]the motor and the personnel using the motor. : N3 G5 ?: x( }! _$ @' d, ]
/ g1 A: B. f1 I7 t! x) b# oMotor Control Topics
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% A8 U8 a- j4 B2 QThere are four major motor control topics or categories to consider. Each of these has several
9 u7 z2 @0 m8 X% [6 C' J) dsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
. y3 r3 J% X- {% t* e( k; m8 pcontrol equipment can accomplish multiple functions from each of the topics or categories. ; K6 H n: n- A" z
( X. n: s# q5 G6 s/ MThe four categories include:
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1) Starting the Motor ' c6 t' S' g/ P5 [' \3 L
1 U J( i* P3 DDisconnecting Means
; D, J6 M6 v; L, A$ KAcross the Line Starting
$ r! B0 v8 H# P7 C7 XReduced Voltage Starting
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2) Motor Protection 7 d6 \, d5 |" A; \ B
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Overcurrent Protection
; v/ e' b5 t' {: s; z6 bOverload Protection . a( M: R0 l9 s+ U6 j
Other Protection (voltage, phase, etc)
% Z, W% ^% i5 D( s3 k) ]! e0 |Environment
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3) Stopping the Motor # C8 q$ C5 R" P3 o* T5 D* C( e
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Coasting
) T' L( W9 L4 jElectrical Braking / z4 v9 {2 ^$ R% }" z- j7 U; Z/ {+ S
Mechanical Braking ( |: K% Z$ o$ P! ]' v: T8 o" H+ ?
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4) Motor Operational Control
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- M! I+ c9 E0 {) ^ E$ U0 T0 ySpeed Control
; \3 a2 Q; j' y8 sReversing 4 h/ h& ~8 b# C7 }: B* |% U( ^
Jogging
- P7 z! s9 S2 G0 vSequence Control |
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发表于 2009-6-19 21:51
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