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ELECTRIC MOTOR CONTROLS
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9 S* S+ d; f# w4 X) z6 z& ~Once the proper motor is selected, understanding the many various control devices available and
" p# ^& T$ d/ m. ztheir uses and limitations becomes an important part related to reliable operation and protection of 9 J, T- K( M; v5 e7 o( N, c
the motor and the personnel using the motor. % B+ `6 i8 @2 V1 _' @: Y
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Motor Control Topics
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* ~+ x M; C0 d8 EThere are four major motor control topics or categories to consider. Each of these has several / a4 I7 F! _" |' g) ]
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
7 _3 K& K; D2 Z: [5 W% e) gcontrol equipment can accomplish multiple functions from each of the topics or categories. , H, C( }& q( {; E: X6 F
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The four categories include:
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' l9 k- u% [+ [, |0 ^4 p1) Starting the Motor 9 z5 j/ k* H: P/ }# N* g% f
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Disconnecting Means
& i! _$ Q3 d0 X/ s: ~9 xAcross the Line Starting 2 `; |- e$ s( x5 F0 f6 u/ X
Reduced Voltage Starting
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- ]; |/ F6 k) `+ j9 _2) Motor Protection $ s \' f M2 Q
& V$ J' b5 { C7 U8 L0 XOvercurrent Protection
9 p6 p" @1 o1 N. p( [- X$ L' ?Overload Protection
- M9 k" g' x# o" J! vOther Protection (voltage, phase, etc)
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& ~# d& z [8 @$ @' G3) Stopping the Motor
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; H5 ^8 o3 q+ RCoasting + J4 a( W, G Z+ S
Electrical Braking
3 A' e% V, Y) I, U; _, n3 o9 jMechanical Braking
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4) Motor Operational Control $ j" \9 r/ Z* M* Z( Q
; @9 l* T# y9 C) wSpeed Control . f( q" b5 p% c2 ~# E
Reversing
; ~. v( a$ O8 t2 e6 U; ]Jogging ' `8 t0 L/ p) S. \
Sequence Control |
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狗仔卡
发表于 2009-6-19 21:51
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