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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
# {! |9 F3 Z9 ~6 Ntheir uses and limitations becomes an important part related to reliable operation and protection of 2 D5 p8 i% q% ?, ^, i2 L& f& n8 r
the motor and the personnel using the motor. 4 X! k9 o; B8 @2 B1 }
- a5 u" W0 t/ V& S8 O3 U) q7 `& kMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 7 v5 x) a2 j+ N. p4 U
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor - ?% Q! n/ h: ^# u
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: 3 r3 d# m- s+ s/ o+ B2 K! o% i% m
! {: w. p0 b3 k3 x2 |1) Starting the Motor Q8 D; A. c2 |$ E
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Disconnecting Means
4 D. C$ \! W, W7 k2 HAcross the Line Starting
0 T$ e' G1 F: R# [3 s( H) |Reduced Voltage Starting
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6 @& b& k& G6 _/ Z% G% D2) Motor Protection ! a2 h/ `- `1 A1 B# M, N' d% R
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Overcurrent Protection
# ]6 \- M; q3 q/ MOverload Protection
% |, W7 W0 V+ wOther Protection (voltage, phase, etc) 2 A1 e: p" i' N% X# ]
Environment ( z* l$ g! g1 j: R: n
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# L/ d: g, ?0 S3) Stopping the Motor . f& d# A- q& @( r# K; b9 A' ~
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Coasting
2 H. R) y3 j5 a1 wElectrical Braking
; [* g/ O4 Z0 L6 B2 {2 z& CMechanical Braking
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4) Motor Operational Control
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- b) } t# I( e0 i2 _6 R; f/ ^Speed Control # t% \. M) n4 o* j. h# p2 L& {
Reversing
# r6 } ^# d# x) H0 ]( q& jJogging & S) z6 Z, }+ p% ^4 [2 ]1 B, L) U
Sequence Control |
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发表于 2009-6-19 21:51
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