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ELECTRIC MOTOR CONTROLS
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6 |, A2 @. M( I8 u3 n1 hOnce the proper motor is selected, understanding the many various control devices available and
$ b, b* `) o3 Z5 |' s4 gtheir uses and limitations becomes an important part related to reliable operation and protection of 8 r3 O/ S7 ^; N* U
the motor and the personnel using the motor.
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$ b6 K. U3 ]# @0 _Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
0 ?# U3 |/ j# T. U a) xsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 4 X8 G0 C2 }$ k4 I7 S
control equipment can accomplish multiple functions from each of the topics or categories. / \" Q" l, p. z3 v/ @4 R
+ X: A; i, s! ], CThe four categories include: 7 \+ p. s s+ C) F- V
' \, W3 n2 k( C2 m% g( d. R1) Starting the Motor 6 q# k$ z ?2 q D. P
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Disconnecting Means
& C& x% z/ L7 @* A4 ^+ r9 vAcross the Line Starting ( V: n8 Z( L$ Z8 o; d) K0 _" k
Reduced Voltage Starting
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! h5 f/ l1 r- y. E/ A* n2) Motor Protection
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: Q6 J0 H) Z" u3 _Overcurrent Protection
9 F5 l, a. f! `# f$ hOverload Protection
* s. Y( y7 T: P" ^- r0 `Other Protection (voltage, phase, etc)
4 [4 Z" T) {/ H) XEnvironment ) F6 W8 b5 U5 d4 n: O+ g
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% R( D- p3 U9 u3) Stopping the Motor , h3 t/ i7 \) q: N9 Q' b
1 s8 w: ]% p' ~ aCoasting
) {& B# e2 a- k& RElectrical Braking
+ T, Z. @) D2 }* h3 O# x3 LMechanical Braking
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4) Motor Operational Control
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9 g0 @5 F, W p( J3 e2 G! sSpeed Control
' T2 k) M5 P a0 @* s3 y$ ZReversing
# ?" s$ N- ^8 w- V F3 m* BJogging
- f @- X; ~: g2 oSequence Control |
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发表于 2009-6-19 21:51
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