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ELECTRIC MOTOR CONTROLS
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$ `! W4 ]) Q; N% `Once the proper motor is selected, understanding the many various control devices available and 5 _' k; t( `- U6 [. b
their uses and limitations becomes an important part related to reliable operation and protection of
1 Z$ i, A% X6 [. G+ ithe motor and the personnel using the motor.
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Motor Control Topics 5 o5 K9 A! f2 S7 |( Z' U- r; W1 i
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There are four major motor control topics or categories to consider. Each of these has several
9 Z/ s- b: O. t6 n* N0 _subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
9 F$ p8 h3 T# J6 pcontrol equipment can accomplish multiple functions from each of the topics or categories. 9 d- y) p+ \. f/ |/ h5 n
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The four categories include:
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1) Starting the Motor 1 G0 P7 v. a3 F& O2 I* j6 i) x2 M
( e8 r* M. _+ v) HDisconnecting Means
" T& c) z- } \8 K- L2 bAcross the Line Starting
& U* @6 \! a6 _$ m2 I1 C$ I1 YReduced Voltage Starting
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2) Motor Protection 4 J9 ~5 d8 c4 N! U2 g6 m* z
: y. x% s& E, D. lOvercurrent Protection
8 U% k4 W& }! ]2 a) B& mOverload Protection E d; k0 z8 X' y2 e) V7 V
Other Protection (voltage, phase, etc) 2 K& E+ W* f# Z( l- c( v( |
Environment
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3) Stopping the Motor
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$ B# }) k. d) J0 W5 xCoasting 6 M$ v8 p+ `) d+ R$ B# ^0 I/ b
Electrical Braking
, f o2 Q1 B2 q$ ^Mechanical Braking 5 `- C ]/ Q5 f4 o8 g: `
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" L6 _3 T2 f. a1 s4) Motor Operational Control
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Speed Control
) S8 y) I; O( WReversing ! f% U0 E& T( H. F5 f5 m
Jogging 7 b+ |) l ] Z6 x% x
Sequence Control |
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发表于 2009-6-19 21:51
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