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ELECTRIC MOTOR CONTROLS 7 X6 u% u* `7 @9 c5 R" _
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Once the proper motor is selected, understanding the many various control devices available and $ M; D2 ?) p5 S3 w0 v; [! G7 a! _
their uses and limitations becomes an important part related to reliable operation and protection of % \4 k$ ]7 q0 m4 a- `9 G
the motor and the personnel using the motor. h, t1 C1 ~, `+ d# @# I) p
' t I$ U7 ]4 v3 JMotor Control Topics * Y8 U5 G* O$ ^( }" h1 l
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There are four major motor control topics or categories to consider. Each of these has several
! s& o& i' u. m0 z. dsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 W- ?' p1 I9 B$ ^control equipment can accomplish multiple functions from each of the topics or categories. ; y" O! V7 i: ]3 }, w
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The four categories include: 9 u1 P, U$ L" ?% _
]1 }0 k+ _9 r `1 I: O. i/ C* I2 `1) Starting the Motor
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6 R9 ` ]3 k9 WDisconnecting Means 4 A% @5 o' h6 I+ T7 A4 e) ]
Across the Line Starting ; S9 R& ?% e3 Q
Reduced Voltage Starting
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' a( `( ^5 `- u: X2) Motor Protection 8 _0 g A& P' i9 m, R
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Overcurrent Protection 9 u9 { A9 p% \2 r. Q
Overload Protection
( |6 F C6 j# K6 @4 ~; WOther Protection (voltage, phase, etc) & v L9 m/ ^. |8 W. E
Environment 4 Q" Q. }6 {* I$ B4 Y9 d5 R
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5 C' S6 {- \0 c& f2 ~9 i! D3 v' k3) Stopping the Motor
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Coasting . H& y. H- ^7 x3 Z4 A0 J* Z; K
Electrical Braking % }4 `* s3 C- j4 \1 E6 u& C g
Mechanical Braking 1 I2 z% z2 ?. [; J9 ^6 p8 G6 o9 {
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4) Motor Operational Control
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5 Z6 t6 V' U$ Q7 @( m5 b: ySpeed Control
* x; Y4 X0 w0 U3 h% k7 PReversing
, ~5 _8 o4 `( mJogging
$ [ b; z% n$ m- l" r8 K! NSequence Control |
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发表于 2009-6-19 21:51
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