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ELECTRIC MOTOR CONTROLS # d, q( ]: [1 G0 E) _' w
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Once the proper motor is selected, understanding the many various control devices available and
5 y. {. U4 P0 v. Otheir uses and limitations becomes an important part related to reliable operation and protection of ! O3 w) N* ~9 S t& S
the motor and the personnel using the motor.
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Motor Control Topics C& r; n. B8 s
2 C9 |. D2 w* `" kThere are four major motor control topics or categories to consider. Each of these has several
& X& E% ?. p/ Y: n7 r7 ?subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
, U: I, ~4 E6 xcontrol equipment can accomplish multiple functions from each of the topics or categories. ; D: e3 B6 G) z
( a7 v, o! R( Q6 QThe four categories include: 6 n$ B! F0 }) {; p: c5 ^
: g9 ?, I1 }4 I& J9 r- J; k1) Starting the Motor
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8 L3 G+ f0 w8 a. S$ q# PDisconnecting Means $ c' o& e2 F; k) C
Across the Line Starting
7 `- X$ ^2 L* ?/ N/ T) kReduced Voltage Starting & G+ U7 v5 E: }3 R W2 o: h6 q. x6 F
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2) Motor Protection
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Overcurrent Protection
6 @& v3 Q& q+ YOverload Protection
0 T3 \- w% r- R5 y/ bOther Protection (voltage, phase, etc)
* ]8 \( [+ V, x' a0 I: n7 JEnvironment 0 g' P7 |: E( E2 ?
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3) Stopping the Motor
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2 O: O* Q) ?1 m) s4 I+ n7 SCoasting $ g. g4 Q \0 ?2 u) ~' s e
Electrical Braking
; U; W1 G4 G' O( k( VMechanical Braking ; z0 M# Z- I% K' ~6 f/ W: {
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! C+ b T$ m& }- K4) Motor Operational Control & }1 [: x% t9 q" ?
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Speed Control
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Jogging 0 ^* T$ J, B4 O, E; c x$ `
Sequence Control |
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发表于 2009-6-19 21:51
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