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ELECTRIC MOTOR CONTROLS
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$ c8 O, ]: V3 h0 r$ t m7 @. pOnce the proper motor is selected, understanding the many various control devices available and
+ e' `& e; _# [their uses and limitations becomes an important part related to reliable operation and protection of
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6 ]: X% T( ]4 P+ a, f" \Motor Control Topics % e: X6 V6 a3 R, r
1 ~, r$ z7 P8 R. a G. a. SThere are four major motor control topics or categories to consider. Each of these has several
1 L0 @# }# P3 Y N; ]% R9 E5 O; L" Wsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
K' [2 N8 R) a, ?6 H% z' Ncontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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. e& E" G! k2 U5 a |' s1) Starting the Motor / L1 y3 E2 z0 ~$ t, H; |" I
, d% Q7 k7 F$ |0 nDisconnecting Means ! x. }5 e6 j. U5 W* }6 _
Across the Line Starting $ A( D3 b) ^) @" k! d+ k
Reduced Voltage Starting
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* `. H" L3 I& ^ D2) Motor Protection ; G. \6 ]5 {$ Y% t" {% Y/ A
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Overcurrent Protection 0 V, Y& \& a& J6 @4 }1 S+ r
Overload Protection
/ B4 E; c; B( U3 `+ N( FOther Protection (voltage, phase, etc)
5 h3 i+ X4 G! @% XEnvironment
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1 L& ^' N! l {& V% C3) Stopping the Motor
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Coasting
4 C" f H/ N1 ]* H0 |9 _Electrical Braking
& Y1 ?! D- @& ^8 Z( hMechanical Braking
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4) Motor Operational Control ) A# _+ a9 A+ b& i( A, `) D Q& A
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Speed Control
3 h2 m+ [6 W E' p$ ZReversing " C9 j6 |6 Q; S& V6 P1 j; g+ O
Jogging
2 J' e: ]' h9 @$ `, v f7 JSequence Control |
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发表于 2009-6-19 21:51
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