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ELECTRIC MOTOR CONTROLS 6 @. c* u9 f; A0 |- [( ?
; s" k# V( u5 JOnce the proper motor is selected, understanding the many various control devices available and . ?8 f% V5 @3 u
their uses and limitations becomes an important part related to reliable operation and protection of
- `* E l, P3 v; Z+ Vthe motor and the personnel using the motor. 1 p4 H1 {: ^: E: L m
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
1 [& @' u$ t( @0 F3 q! y3 Esubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor / }( D( O7 n) h
control equipment can accomplish multiple functions from each of the topics or categories.
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! s$ l3 ?! E7 b9 c) W9 x6 i$ G7 _' j5 ?The four categories include:
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/ d9 j! x2 h0 u1) Starting the Motor % ]4 S( N. T1 F- m. B; L/ s
5 C& N2 r$ a2 F" p sDisconnecting Means
0 [' I/ s Z6 c6 iAcross the Line Starting
7 _1 ?0 j0 r6 j2 H k' Q* z5 oReduced Voltage Starting # Y3 n6 U/ C; m+ o* i' T* g4 u! I
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2) Motor Protection
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* @; p& F. a$ {! [; VOvercurrent Protection
0 e$ W T% B4 i5 E; X' L+ IOverload Protection
# U( Z: N) T2 h hOther Protection (voltage, phase, etc) " j. ]. r# B0 z7 |: U( N
Environment
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L l h' P6 ~; k5 A7 ^3) Stopping the Motor
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6 m7 a6 k( z/ J' f# }+ W' e( d# ?: ICoasting
; `1 _8 v+ }' i- h* g. ^- P' ?Electrical Braking 3 X% j1 Q: p7 F. G' v8 M4 v3 ~
Mechanical Braking 7 H! l8 p8 r2 k' ]$ c
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5 z# ^& O/ e! P5 [" E) Z. Z4 j' b4) Motor Operational Control
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- A4 `; d& G2 U8 w4 V/ FSpeed Control
/ M, R- h9 W! U3 x4 p& M4 K" tReversing / X8 {) Y+ ~1 o5 `4 A. [9 a
Jogging 7 a, J5 U1 Z+ ?
Sequence Control |
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发表于 2009-6-19 21:51
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