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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
0 n5 ]) _/ f; @their uses and limitations becomes an important part related to reliable operation and protection of
" |( E" [9 F7 ]. Z- dthe motor and the personnel using the motor.
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Motor Control Topics
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3 O5 ^3 P( E% N8 v/ ^& kThere are four major motor control topics or categories to consider. Each of these has several
- ~4 D- q. H5 D/ a9 I0 Esubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ Y, S7 N1 {8 Bcontrol equipment can accomplish multiple functions from each of the topics or categories. . _0 H8 A/ V/ J, x! Z* L
0 Z+ H5 Y# Z7 _The four categories include:
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1) Starting the Motor - z! @- K. P6 t1 d
- I* h: q" |7 v1 {Disconnecting Means 5 `3 w# ` _( }) P6 R( l0 T& \/ K& A
Across the Line Starting
! \5 t4 X. I+ P. |9 b: LReduced Voltage Starting
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^" ]+ l8 n6 D* |2) Motor Protection ! w# l( v+ }. J- x" q/ w
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Overcurrent Protection
& a0 e# j6 x8 u! q" HOverload Protection
" _1 M( ?" C: b; u7 y3 b% Z9 ]% KOther Protection (voltage, phase, etc) , |! Q& k7 f+ N: }, u+ t
Environment 8 B3 G) N! e' T# O
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, w6 `" G s q, I4 l3) Stopping the Motor
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Coasting 2 `2 l" _' m+ ^" P2 _
Electrical Braking 5 j6 J3 ?! n# p' m+ I
Mechanical Braking 7 Z, |$ s( f6 {+ i/ z
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4) Motor Operational Control
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" w% g! \8 j/ K8 `' j6 ?/ s# XSpeed Control
% j- r5 K& t( u3 JReversing
f8 @8 P" }; [6 j7 n0 lJogging 8 w9 h" ]$ [7 [$ E3 D+ v$ S6 @
Sequence Control |
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发表于 2009-6-19 21:51
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