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ELECTRIC MOTOR CONTROLS 6 D9 u: V6 p! I& Y; u5 J: R5 Z+ O
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Once the proper motor is selected, understanding the many various control devices available and
8 u) l) x2 l4 W6 u* q$ {their uses and limitations becomes an important part related to reliable operation and protection of ) G& P I8 R6 d) Y# X, y& h+ x
the motor and the personnel using the motor.
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! b- [; T: G+ [4 {Motor Control Topics 7 `, L L' I+ L% r1 K
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There are four major motor control topics or categories to consider. Each of these has several
) s E5 t0 V5 |7 I5 Tsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ m5 C) S- d' t: u" R3 ucontrol equipment can accomplish multiple functions from each of the topics or categories. 1 g7 Q$ U* K7 ^$ J: I
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The four categories include:
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/ H9 _* D5 }1 }2 c- Q1) Starting the Motor
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! Z, \" N( H9 Y! U; S; b: P7 DDisconnecting Means d- H' u. z5 `/ ]0 w
Across the Line Starting ! H; k/ q* `4 ]% |2 @6 y
Reduced Voltage Starting - y6 |% _+ Y5 W1 v/ T
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2) Motor Protection
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Overcurrent Protection
4 U9 E# I" L( h) EOverload Protection
/ Y. F0 G {, u1 U5 g. z+ s( u' HOther Protection (voltage, phase, etc)
1 v6 j3 E/ t7 _( i8 ]% \' j8 Z0 i: uEnvironment - }" f! `# a* c: r, v
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) n# A0 F) }# F5 A* S0 b3) Stopping the Motor
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Coasting
% x9 W: ^4 D2 R4 o$ D2 SElectrical Braking
4 h3 V: M! T1 r9 o! sMechanical Braking
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/ e0 ?# [5 z/ J5 j5 D' Q+ S3 f0 V2 {4) Motor Operational Control
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_! j$ }0 J2 s4 f4 |% vSpeed Control
5 d g# [: @9 ?0 P( FReversing
, y! w. Z$ p! ?Jogging " _2 X1 L& |3 ~/ _+ a% u4 i0 z4 T7 b
Sequence Control |
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发表于 2009-6-19 21:51
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