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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
# j# \; J0 @, e( Q% e( }their uses and limitations becomes an important part related to reliable operation and protection of 7 B8 a; ~4 \9 }5 M+ f
the motor and the personnel using the motor. 7 f% N& S) B& v6 J
- K# I% M) s" O! |- v1 y6 |Motor Control Topics . g o1 ^/ T9 m$ ?" Z/ ? u
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There are four major motor control topics or categories to consider. Each of these has several
6 a, g% R" j# G7 {; G& i8 K" o) ^subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
' U5 f6 y) J& _( h! xcontrol equipment can accomplish multiple functions from each of the topics or categories. 2 R0 H& S# k& ]9 K" q3 {0 k- H
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The four categories include: * t; E- \4 K2 S! g& X
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1) Starting the Motor
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5 k7 Y. w7 k$ L9 m% g3 aDisconnecting Means
" q1 D+ P8 T" O- cAcross the Line Starting 7 V2 f& D* t: z7 I; w+ Q9 j
Reduced Voltage Starting
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2) Motor Protection
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( {2 H" p* v/ Z% ]Overcurrent Protection
; U1 n6 L$ m4 m3 I1 W9 }* |( OOverload Protection 5 U" r% G( U; ^' Y# n
Other Protection (voltage, phase, etc)
! p5 D# L1 Q- _2 `$ d0 gEnvironment 1 b6 @% D# H3 [ d0 S
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( V5 D5 L9 j/ v# {5 @/ A( \3) Stopping the Motor % N4 [6 c: T J V/ g. Z
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Coasting 4 J: X1 d; b5 z7 \, @" q0 t% N
Electrical Braking
" g0 l8 i: R6 C7 b7 e g" ]Mechanical Braking
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4) Motor Operational Control
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( C9 ^: N. m& i' U' iSpeed Control
7 u3 P$ X8 X/ E% F, |. mReversing
" ^- T" b3 a# d+ T- DJogging 3 p( b9 K* T* q* [: s- T
Sequence Control |
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发表于 2009-6-19 21:51
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