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ELECTRIC MOTOR CONTROLS
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7 f E3 t3 _5 `0 H% X: m2 }% g- j3 `Once the proper motor is selected, understanding the many various control devices available and
. H9 g' x9 W" n1 J' ?their uses and limitations becomes an important part related to reliable operation and protection of ( S2 Q. C5 @5 u& M: M
the motor and the personnel using the motor. 8 X4 R! s* {) A5 h
2 `( F; C% E8 W% ]" xMotor Control Topics 3 z+ x7 p9 a0 `9 M
' x; {: T1 \: s5 H* X( t: hThere are four major motor control topics or categories to consider. Each of these has several
/ J/ n9 N" q3 m. c$ |subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
1 S% C( a2 f! V! ~! q7 acontrol equipment can accomplish multiple functions from each of the topics or categories. / S: U7 Y8 r! u# r4 B+ A
8 U3 G# D4 S" u/ f0 v* Q8 s* SThe four categories include:
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( P: k: e, L9 [% K# w1) Starting the Motor
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" ?# Q* W9 L" L1 {! d) DDisconnecting Means
: i7 ^! K# p- i0 GAcross the Line Starting $ J; `0 l" d! g
Reduced Voltage Starting 0 }( I! |$ d# K" A
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2) Motor Protection 8 J. L3 I( b* T. y. b' X* q3 a
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Overcurrent Protection
% m* J- y5 q) x: I1 ZOverload Protection
s g5 F! i# W& ]* FOther Protection (voltage, phase, etc) , W4 @* h9 c6 x( D( b- v P
Environment
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4 ]6 v( q- W% q; s0 V: o+ H B6 X f3) Stopping the Motor
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Coasting
0 n+ Z2 A% N7 [3 P) `, c. s- `Electrical Braking
( G$ e7 {1 O+ ?6 p" w; K4 CMechanical Braking 1 y+ {! C4 p" s) t$ T$ i5 `
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7 n2 D- @: |+ V$ c( D4) Motor Operational Control ; X' z. O+ j& l/ v8 c
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Speed Control : W Y# J" K; |* M
Reversing
+ S& G% b1 Y7 B& B+ Z) IJogging
$ N% j+ _: P" V0 bSequence Control |
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发表于 2009-6-19 21:51
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