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ELECTRIC MOTOR CONTROLS 5 p! y- D5 C0 E7 s% r( w
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Once the proper motor is selected, understanding the many various control devices available and ; M$ k" Z8 Z+ D' n
their uses and limitations becomes an important part related to reliable operation and protection of 9 t0 s& M1 [" b/ @) |& ~2 W# w
the motor and the personnel using the motor.
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/ [1 l8 w+ J, z" w7 }+ fMotor Control Topics 5 a+ z4 G1 m" b# g, b; x* c
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There are four major motor control topics or categories to consider. Each of these has several
7 R E* y4 i' r4 B3 _& Z/ F; Vsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
* x) w( j4 }$ _4 o) h0 e$ [" h+ }control equipment can accomplish multiple functions from each of the topics or categories.
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) ?( z4 x1 t* t- `% g" S+ A" Y0 ~The four categories include: ) H7 T) P. V3 Q' N" p: j3 _
& r$ P' h+ M- G, s1) Starting the Motor ! ?: i8 }; k0 Z% g% ?9 U t
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Disconnecting Means
4 K7 |2 \$ I7 O9 jAcross the Line Starting
1 Z' x$ g$ @3 ^& A+ c5 R4 F" G8 BReduced Voltage Starting
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. |8 P7 E3 ~: c' i! V" k2) Motor Protection
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Overcurrent Protection % s0 L9 E% ^% W
Overload Protection $ [+ w0 N2 r) Z$ l9 @3 `
Other Protection (voltage, phase, etc) ) S2 E: L0 x. E5 O/ C
Environment
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3) Stopping the Motor
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8 I1 F% Z+ J i% D6 e2 M5 fCoasting " o2 o2 I* d# A2 `0 {9 F: |/ A
Electrical Braking
u! R: M$ c. v A$ m; }Mechanical Braking # h' ~; c: T0 u6 D' F/ |- H
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8 e: d. [; Q/ y4 @" H5 Y4) Motor Operational Control
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' Q3 ?& y( C* b7 y4 ?Speed Control
/ g% N1 D( n e2 B: b( n0 _1 JReversing
/ `! ?8 @8 m" R) z) \Jogging 8 V) l2 ^; J2 C' z
Sequence Control |
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发表于 2009-6-19 21:51
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