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ELECTRIC MOTOR CONTROLS
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7 N7 e& T* j# l, r) v( X' GOnce the proper motor is selected, understanding the many various control devices available and
$ N, p/ O+ \5 Itheir uses and limitations becomes an important part related to reliable operation and protection of
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' H0 x. _) @9 i# {; S# N1 a' kMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 1 w$ N( k9 n. u
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
7 ~* h% h: Q; Y+ a% _& i- ?) ~0 h& gcontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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4 h- B& a# s5 ]3 s5 P2 g1) Starting the Motor 3 W* h" V! y8 n# ?
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Disconnecting Means
2 \7 D1 r2 H1 p7 ^$ H( pAcross the Line Starting
& |) ?# a4 z) ]0 R9 C" `! OReduced Voltage Starting
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( r+ k- p2 l3 d, z* o2) Motor Protection 2 z. h5 d k5 I- n! u
3 a" `9 P+ E3 {+ ? Q8 J# z( UOvercurrent Protection
4 @4 ]" |7 L+ U0 Q) y H# p; s2 u. aOverload Protection
8 F, f8 {9 p9 M9 l& eOther Protection (voltage, phase, etc)
, O, q/ L0 ~( W9 D* G; v( aEnvironment
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: \ h: {1 l( _- @3) Stopping the Motor
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Coasting
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* l, g1 ?; h( C4 _Mechanical Braking : D4 }& x4 K' a3 u! l
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1 T. m4 s7 w2 m4) Motor Operational Control
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Speed Control
4 K8 ~" R$ E4 ?& \( q6 vReversing ( O3 A5 J0 ]1 r7 H5 w4 x
Jogging 8 X0 n* ?- j- K! ]1 }! V
Sequence Control |
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发表于 2009-6-19 21:51
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