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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and ~8 U+ H b& E; T
their uses and limitations becomes an important part related to reliable operation and protection of
! u7 g9 O8 }: ]8 {, a7 E' ]the motor and the personnel using the motor. / C3 T* g. W( E4 ^0 y6 a" o
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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
' R" |) M( v4 @* K. asubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
, C1 n$ E' c( y9 z i9 Y) Econtrol equipment can accomplish multiple functions from each of the topics or categories. ! g( J2 x7 D; I2 J, x" c
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The four categories include: + J. {1 y# y) l$ x( X
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1) Starting the Motor D1 m9 L5 V9 N" d+ v
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Disconnecting Means
. v! p% j# C/ i) N' VAcross the Line Starting
. e1 z$ B h; M$ L3 xReduced Voltage Starting ' E3 J% q% \8 p$ W, Y/ l% d5 F. a/ k6 W
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% w5 `1 Y S6 E- H7 m2 m2 Z2) Motor Protection . s! ^) l2 B! l$ Z1 k
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Overcurrent Protection
9 v" [% D# a0 N: C$ q- E% W/ }* o! n0 TOverload Protection
" m2 N: o, `, }; R! v2 |Other Protection (voltage, phase, etc) # A6 J+ c. ^5 f; I! R2 w2 o
Environment
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3) Stopping the Motor
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Coasting
" X. E r3 y: EElectrical Braking
; [" I4 U( \5 f1 v% f$ W- VMechanical Braking
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$ [7 {/ _% ?' l4) Motor Operational Control 1 j- q6 u5 f) g7 H. [) X; h
) E* @# [6 W) S. B/ s2 {Speed Control . v/ V/ \$ N/ p" K# P
Reversing 2 @4 h4 S' K% b# v7 B
Jogging
9 g% \0 W3 Q4 N2 C5 P) RSequence Control |
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发表于 2009-6-19 21:51
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