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ELECTRIC MOTOR CONTROLS 4 F1 t+ y, g8 Z$ j3 L
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Once the proper motor is selected, understanding the many various control devices available and & x: E0 a7 P9 X( g
their uses and limitations becomes an important part related to reliable operation and protection of
! x2 }1 U) j, Y U3 ithe motor and the personnel using the motor. ) j& J6 e0 N4 P5 Y N: J; F4 D
9 D$ E5 I1 f0 l, ?' zMotor Control Topics
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/ Y5 p0 o: j3 \' Y/ q. kThere are four major motor control topics or categories to consider. Each of these has several
- S5 F. a1 p9 I2 N1 t* jsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ' _. A' r3 q; V9 D/ \( q, j( v6 h. v
control equipment can accomplish multiple functions from each of the topics or categories. & h$ {! u! g, E6 e% n
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The four categories include: " B! d8 |% ^1 ]( N: v% D
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1) Starting the Motor ( K* X: u. M+ f, m8 A) j3 a: N, M
0 Y* ~* W" f- j6 e( j6 Z2 }Disconnecting Means , P8 s8 E/ X3 g! ?# l4 v$ G
Across the Line Starting
; D: E( F; ^9 d: [1 M0 ZReduced Voltage Starting
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2) Motor Protection
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9 A! J, |) {7 N5 Z& _& MOvercurrent Protection
. h1 P2 }* t* Z8 f$ y9 u s# H7 |Overload Protection
# v `" i7 Q S) |3 GOther Protection (voltage, phase, etc)
; T6 A% H. ~# NEnvironment 8 u) F% B* D* }$ _" T j
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( r. |- @* T' z, |4 G. I7 G; L$ e3) Stopping the Motor
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Coasting : O( @9 _7 u a3 u: P q+ q& {# _
Electrical Braking # g$ O: k& @( G1 l$ ~4 k1 ?
Mechanical Braking : X* [9 g3 W/ d. t
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0 N# u" Z3 Y' x4) Motor Operational Control
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Speed Control
, ~. }( l9 o B+ L$ [- i* eReversing
1 G, N2 |0 U3 LJogging : Y6 h, ? W8 A6 @3 n& D- s
Sequence Control |
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发表于 2009-6-19 21:51
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