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ELECTRIC MOTOR CONTROLS 1 M0 v1 i/ t3 b p5 v; o6 X5 z
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Once the proper motor is selected, understanding the many various control devices available and
~3 n+ q) T, K( d" itheir uses and limitations becomes an important part related to reliable operation and protection of
9 S' a* n- U! \$ E4 l% |the motor and the personnel using the motor. - p8 X3 a! \( \& r5 v) L- Q2 O. s
# e& Z. O2 c+ _( T- x; tMotor Control Topics 8 g) E8 J( j3 g4 U) t$ u
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There are four major motor control topics or categories to consider. Each of these has several - }, j: k# f7 q6 I- x0 Z! D
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ; M$ x( N( e: `' |1 i& Y
control equipment can accomplish multiple functions from each of the topics or categories. # A' i& j! d p' N9 Q0 @) J
! |$ e0 G5 C! X5 @; H' [2 H, yThe four categories include:
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+ N6 m$ Z: u& ?3 h* N1) Starting the Motor - d) E: @# @; X/ J
6 A6 h+ I( i" L7 h5 A. H- _8 ~2 ]Disconnecting Means
0 i; q! F# G+ ?6 f+ c* j) d1 [5 BAcross the Line Starting ; c3 \, Z7 _" \, @- Y, w
Reduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection
" K9 a# J5 p9 C9 i$ {. Y; lOverload Protection
* {. Q4 m+ J+ \( E) QOther Protection (voltage, phase, etc)
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3) Stopping the Motor ) C% J, D0 y% \7 T; W
1 b: Q) ~8 |2 S& NCoasting 4 J( F( N0 R! t
Electrical Braking , u) Q7 J, j: a! L# p4 K( l
Mechanical Braking
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4) Motor Operational Control * O7 T4 k5 ^( l% t8 W! V5 A* J6 Y
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Speed Control
+ S' d4 c8 k0 r- Z- k! tReversing 6 A& @! K! `& s% W
Jogging ' d: K. L+ R' O+ o2 K
Sequence Control |
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发表于 2009-6-19 21:51
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