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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 , T" d2 U0 x/ M; V4 O- C
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics $ O9 L6 ?% b* i6 N
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There are four major motor control topics or categories to consider. Each of these has several 7 l4 V6 `, d% \) E6 v
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
& N8 c' v* l+ ^% h! u8 Ocontrol equipment can accomplish multiple functions from each of the topics or categories. 3 ~7 ]$ A8 R8 m' r% h, C
# H+ g0 D3 L# W/ ]9 WThe four categories include: 3 q7 \9 }4 S- F) ~% Y! N$ a
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1) Starting the Motor 9 y6 f5 `9 V2 g2 @6 ^4 s, e
6 {9 o. }' @' i* |. [/ ADisconnecting Means & u* t& X$ A+ A
Across the Line Starting
" C2 ~, q' U: @0 {3 x4 z# L) r% c \Reduced Voltage Starting
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" [6 s, d0 R9 W" |2) Motor Protection
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B8 O7 A G- S( B1 W5 d0 yOvercurrent Protection
' \# z9 C& W$ T+ H% bOverload Protection
8 L3 @! O" l/ D. Y7 A+ aOther Protection (voltage, phase, etc)
' d" {7 A+ t/ b8 qEnvironment
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, b' n/ V! \, j( r$ n9 L3) Stopping the Motor
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9 n/ v j( C- w5 p$ {4 \0 {Coasting
9 w3 Y2 z/ a5 ?- r iElectrical Braking
" F% `/ k( U1 f5 @ V$ p" AMechanical Braking 4 ?& C2 K, h- |
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! p3 z* D' X+ Z8 z# z% s' M( Y% R4) Motor Operational Control
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% D G* t* X9 m" dSpeed Control
9 h0 n5 C0 k/ H+ Z4 D% }Reversing 8 U* k6 S* _3 ^! ~" |7 F! f
Jogging 4 }. j' ?7 k9 d
Sequence Control |
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发表于 2009-6-19 21:51
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