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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
: z( k2 g5 c, u9 o: q1 n% ztheir uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics + H& }$ f' a; f( b. K) ]0 ^# l
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There are four major motor control topics or categories to consider. Each of these has several }2 }' J/ H3 H) x- F
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
" u; O& g1 u# N6 Ycontrol equipment can accomplish multiple functions from each of the topics or categories.
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8 O( w6 u. a1 ^7 @5 UThe four categories include:
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1) Starting the Motor
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Disconnecting Means
( g4 J: U ~+ {7 L' vAcross the Line Starting ( `; K' E2 {- i
Reduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection 5 V, b" i+ R+ p! n/ O$ y
Overload Protection
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Environment
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+ X# \/ _- M6 n. ?* y3) Stopping the Motor ! ]7 y0 |" r, b6 i$ |$ w, n- E% k
) P" I" B( N6 ?* xCoasting ! ~8 T+ b! A8 b9 B# J2 Q- R
Electrical Braking
. T/ u. O1 x R/ {! ^# VMechanical Braking
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4) Motor Operational Control
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Speed Control ) z8 n; L' u1 r" b9 V
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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