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ELECTRIC MOTOR CONTROLS 7 ]( S: I* ~8 @. I
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Once the proper motor is selected, understanding the many various control devices available and + I t) G' X" U7 E8 J1 `. `4 y
their uses and limitations becomes an important part related to reliable operation and protection of 9 q) ~# _: C/ C- I
the motor and the personnel using the motor.
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' U; d' F& J, g- _' H" \/ FMotor Control Topics . g5 A, f: v7 T g) x$ S9 O% Z3 w3 B' {! f
1 ?% _+ J2 y1 M* P" I9 S' {9 { m; I* ]There are four major motor control topics or categories to consider. Each of these has several 6 j H+ R6 b1 f7 |+ c' M
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor & k" B4 x& ^" H W/ K( u K$ z8 g
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: 7 i# X, Q9 p% O
* D; v7 i3 b% B1) Starting the Motor
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Disconnecting Means 8 p: h; A% s! [0 f
Across the Line Starting
! X9 Y! D7 I/ k4 m* NReduced Voltage Starting
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2) Motor Protection : T1 {8 `' q% y* V! {
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Overcurrent Protection 6 A( c% s9 P. O; ~
Overload Protection
$ i- B; _4 l; B# x1 z, l9 Y5 SOther Protection (voltage, phase, etc) 7 o& ~% G( _) \( Z% {; q
Environment - ~" X6 O4 K( B
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- K4 ^% p' g! M) f4 g3) Stopping the Motor
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' Z2 j' M- p r8 R- B2 f4 m$ r3 gCoasting ) d+ J; Z$ v1 S) l5 `1 d2 F
Electrical Braking ! [# C1 a& j( S3 o
Mechanical Braking " i+ D" s% @: t3 G% }6 _4 w% i T4 J
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/ A. ~. r% L1 q4) Motor Operational Control % `, ^ m1 {: `2 I* m; o
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Speed Control
3 c S4 i* x6 ?+ sReversing # b7 p( T5 c! `7 ~; o x; E" T7 s! }
Jogging , J, h& w l. [3 a
Sequence Control |
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发表于 2009-6-19 21:51
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