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ELECTRIC MOTOR CONTROLS
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6 M/ h" N! F: E# s4 k! D$ GOnce the proper motor is selected, understanding the many various control devices available and & d( @7 B- ?/ H- @* t7 I
their uses and limitations becomes an important part related to reliable operation and protection of
# Z9 Y# V" n8 f% a5 ]the motor and the personnel using the motor.
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Motor Control Topics
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. S- l: z _. X# z# }% q' RThere are four major motor control topics or categories to consider. Each of these has several # w) u- r; m+ e" x9 o" n0 `! I
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
) |# n2 _4 T. |' zcontrol equipment can accomplish multiple functions from each of the topics or categories. # c. i- U x. v1 N) _
! @( k- ^; h' @The four categories include: ) A4 _" |! u) c2 K
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1) Starting the Motor
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# F# ^* `9 C1 n% u" HDisconnecting Means " u: N1 _1 }# `0 Q# h% E
Across the Line Starting 9 H+ K; L% B2 e$ k: U7 i
Reduced Voltage Starting
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2) Motor Protection
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# f. P2 D$ U9 V! m/ h8 r( \( OOvercurrent Protection
+ n& f7 N7 Z6 F0 nOverload Protection 1 s1 ~: P& J: i9 l. s
Other Protection (voltage, phase, etc)
- R( J9 m% x, i5 kEnvironment
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' B# F$ j2 `, w1 b/ b3) Stopping the Motor * {' V! @! z) u# {. ?: k
4 s. y( t7 K8 ?Coasting
. Z. l' x4 p; T* DElectrical Braking
. V( t& d/ R! X" m6 sMechanical Braking
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2 K6 n/ C, |; _+ h4) Motor Operational Control
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Speed Control
8 V4 d# H0 K8 o% F8 a9 zReversing 8 O3 ]- g9 j% r7 K' M
Jogging n! n' D& g: r8 \% J1 h, H
Sequence Control |
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发表于 2009-6-19 21:51
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