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ELECTRIC MOTOR CONTROLS 0 r7 i1 g7 H2 m& L2 L
" I8 }- r2 ~% E6 D7 I/ {5 b! tOnce the proper motor is selected, understanding the many various control devices available and
0 r' j0 K* G7 ?7 [, O0 Y9 d* Ztheir uses and limitations becomes an important part related to reliable operation and protection of 7 T8 k' ?9 C- g4 v# |9 [, t
the motor and the personnel using the motor.
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% z- L e) W' L; d8 sMotor Control Topics
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+ e$ x6 \7 l Q g% W: U, GThere are four major motor control topics or categories to consider. Each of these has several
( _) s- |# V* }" Usubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
9 B! [. m1 ~0 H3 e' |control equipment can accomplish multiple functions from each of the topics or categories. 3 u8 m0 T# b R+ h C
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The four categories include:
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- X! \% w8 `$ [0 f# T1) Starting the Motor
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Disconnecting Means
q7 k7 x* I5 t) tAcross the Line Starting
& t& Q. a1 V+ v* wReduced Voltage Starting ( S( u- A3 Y8 @; ?0 J" {
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) n! o2 Y0 M: `% ^) ^% f1 X/ ^2) Motor Protection
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Overcurrent Protection / u& Y" l' M! C6 X1 m/ y
Overload Protection $ K8 A4 I, i/ O) w r6 Q- @
Other Protection (voltage, phase, etc)
% R3 B( ?7 H, Y4 o% f [" S7 ~3 `Environment
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! u; V2 S `. g! d% ?5 Z/ F3) Stopping the Motor % N- W9 M9 h9 b' w) |* A4 }
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Coasting
8 ]! R2 X; @0 F b) a) \Electrical Braking 0 [: N; S5 u2 X
Mechanical Braking / f4 b1 B- p: y$ r5 a. \
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: J0 s! ^' b3 P( |& u4) Motor Operational Control
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Speed Control
3 \) g3 o) o; s) \Reversing 3 o" o' R9 w6 T" x6 P5 V
Jogging , ?, p- e& w( q6 L3 y, {2 m
Sequence Control |
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发表于 2009-6-19 21:51
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