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ELECTRIC MOTOR CONTROLS
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1 s: B" j! p+ D! [% ^Once the proper motor is selected, understanding the many various control devices available and
% A" N3 m7 J: d) V( x. ^their uses and limitations becomes an important part related to reliable operation and protection of
8 \0 \8 n6 M& |/ athe motor and the personnel using the motor. , t8 M! H$ ^0 D2 X: [! a4 U" b/ K; A
3 e+ `' f# c' b$ A7 z6 PMotor Control Topics ! ~6 v# O2 k$ n7 ~& |% _) @
: j6 c% z0 s+ h6 z0 iThere are four major motor control topics or categories to consider. Each of these has several
6 S, Z6 H) J& H# |6 T, P" b# Csubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
) \. ^. h- a. ccontrol equipment can accomplish multiple functions from each of the topics or categories.
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8 }- y- U( _( T) x8 UThe four categories include:
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9 s7 f W$ p c+ v7 W3 ?5 N; L$ X1) Starting the Motor 2 X1 }4 {. b5 R: c0 N& R& K
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Disconnecting Means
8 V, o' Q' h3 H9 eAcross the Line Starting
) P0 ~; P: f2 t* t, M; VReduced Voltage Starting
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3 G7 M- |4 W- n; l# |* M& g* U6 h2) Motor Protection
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4 n* K5 k$ D( c. X* V2 u! b6 n- x2 [Overcurrent Protection - D0 I; W5 i: c) F$ g) s( u8 \8 |
Overload Protection
1 V9 y6 s5 k4 q) c7 F$ y; iOther Protection (voltage, phase, etc)
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3) Stopping the Motor
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7 J0 `0 l8 c- r5 `8 dCoasting
, q+ o" ^' }* AElectrical Braking 4 @; C' w/ M t7 O. g! Y
Mechanical Braking
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4) Motor Operational Control * k. E1 s4 Y: U: e+ \5 d; e
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Speed Control
# x- H% F) W& A' J2 ]Reversing # \ c5 u1 H7 A% O6 Q
Jogging
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狗仔卡
发表于 2009-6-19 21:51
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