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ELECTRIC MOTOR CONTROLS
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8 Q, z; e7 l, j+ NOnce the proper motor is selected, understanding the many various control devices available and
, }) q3 \6 v2 G3 o) k: xtheir uses and limitations becomes an important part related to reliable operation and protection of
$ s! e% a. k& S2 w# ?the motor and the personnel using the motor.
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, n v V5 t4 \Motor Control Topics
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$ Q& d+ \; _9 ~$ UThere are four major motor control topics or categories to consider. Each of these has several # x% L% G' x) O* P
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
8 w# R8 N6 S% _6 |4 g3 ]control equipment can accomplish multiple functions from each of the topics or categories.
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! D, V9 c' W/ U: {- Q* k7 V FThe four categories include: : m# n0 b% R% Q5 Q
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1) Starting the Motor * ?, N4 K( `& m& ~! m) G
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Disconnecting Means : F1 c c: ]% D/ B$ m; D
Across the Line Starting 1 q& n* `5 p1 F# ]6 L
Reduced Voltage Starting
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. _; g8 D: D2 k7 u2) Motor Protection
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, `% n% p6 R' d2 IOvercurrent Protection 8 v6 @4 e: u& ]
Overload Protection
# [% H/ e" f' }Other Protection (voltage, phase, etc) # V9 H) p: t+ w2 Y8 U' f0 W+ `" L
Environment
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0 M: c/ k% L6 _8 i' ~3) Stopping the Motor & ^$ @9 N( ^+ R' d! K! k
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Coasting
$ K+ t$ ~ E! [, q eElectrical Braking . b1 M; a1 d: T' O
Mechanical Braking
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w [6 I" r1 y- ]4) Motor Operational Control & w3 M4 Z/ j- N5 h, b; J
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Speed Control
5 A' |* x0 b0 G' {8 s/ X7 jReversing p+ m) q7 I; l7 ^" [% J3 C |( D
Jogging ' x) h, q: @% f1 A! x% I
Sequence Control |
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发表于 2009-6-19 21:51
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