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ELECTRIC MOTOR CONTROLS ) ]8 c _8 S2 o5 X
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Once the proper motor is selected, understanding the many various control devices available and 1 o: A: P5 K9 j8 Q! [8 m
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics 5 g: u5 d# E- U9 S
( {4 G- p1 i% U" w, I3 kThere are four major motor control topics or categories to consider. Each of these has several * R9 A* T6 K% T: C- d" m
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ; O- z7 l( P/ O
control equipment can accomplish multiple functions from each of the topics or categories. & @# o2 C$ f! q$ Z5 \4 K
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The four categories include: 2 J, a( d; E7 \2 H7 Y1 W2 Q9 a" \
: N" ]1 v1 m: p, x4 |& A1) Starting the Motor
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8 M! M T; |+ w' g7 xDisconnecting Means
3 P8 L% r& x, t% mAcross the Line Starting
K# j; T$ Q; I$ Y4 Q* kReduced Voltage Starting 7 K. s3 x$ Y; c! [1 `
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; l; ^6 N) K2 h% s' T/ F u9 ^. a9 w2) Motor Protection
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Overcurrent Protection ) J8 A7 r* l* l) T/ _0 ^
Overload Protection 9 F+ r8 c; S4 `7 h
Other Protection (voltage, phase, etc) ' i' z, P0 H0 q R
Environment
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3) Stopping the Motor
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Coasting z. h9 C" w, r
Electrical Braking
( w0 E! { K" Q/ `+ |4 W$ Q# ^! HMechanical Braking ) \$ o3 ]7 D/ I# L
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4) Motor Operational Control , w4 O# }5 Q/ t" ^ x
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Speed Control
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Jogging
/ J2 j+ Y+ j0 ^0 DSequence Control |
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发表于 2009-6-19 21:51
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