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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 J; k- l3 d6 {' @4 n6 j4 b3 atheir uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics ' @, b' R. a1 I
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There are four major motor control topics or categories to consider. Each of these has several 5 G) o1 a" }4 v" I0 G3 y
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
9 O7 s+ h$ R6 K) {# s: D. }control equipment can accomplish multiple functions from each of the topics or categories. 5 W4 B# N8 ~, X5 _2 u& L, H
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The four categories include: - {4 Q1 w; v0 o; J2 x* \2 F
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1) Starting the Motor
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Disconnecting Means R% U4 ~* H* e2 {8 t! ^
Across the Line Starting - M+ ~; M$ [5 A7 L4 d" X+ t
Reduced Voltage Starting # ]& N6 b: v; v7 b% M/ p3 z
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9 n4 E, U v. |* V9 e" b2) Motor Protection
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5 ]" N% _& B$ d9 c* AOvercurrent Protection & y1 ~+ v( u8 r, I, ^) j8 k
Overload Protection 8 Z2 X/ A Z- z
Other Protection (voltage, phase, etc) & _+ j) V2 L7 L J' G/ A% Z4 @
Environment
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3) Stopping the Motor 8 }. E- X% @: |
5 J: v8 T0 @$ @7 p8 ]2 K' h) yCoasting
' g" t: l, O4 ~& k0 UElectrical Braking 7 w1 c4 H; W; o! _& N2 n" ~% k$ G
Mechanical Braking 1 E% R9 m1 _2 [3 f. m- a! a
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4) Motor Operational Control ( K" D: x5 w. F& z7 ~, G# i
X* s9 `9 L. r: @7 f' d$ ESpeed Control
/ y7 ~( q+ N; O6 |9 T; MReversing , E% N: u% Q3 Y; k
Jogging & h' L# x8 ~& ^ ]9 A
Sequence Control |
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狗仔卡
发表于 2009-6-19 21:51
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