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ELECTRIC MOTOR CONTROLS
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+ y {. I3 H1 nOnce the proper motor is selected, understanding the many various control devices available and
# g3 q( b: I- ]4 @2 ytheir uses and limitations becomes an important part related to reliable operation and protection of
- l, _, |0 {& r5 j& l& Xthe motor and the personnel using the motor. 1 I( t6 j9 ?! i9 w9 ?0 ^: X; M
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Motor Control Topics + Z! O/ S; [; G: _) P0 q
* Z$ Y3 b* V8 e9 M) D+ w/ OThere are four major motor control topics or categories to consider. Each of these has several
! s# v( I0 Y. k7 m- Psubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ) M7 a( v. j+ H: g/ w
control equipment can accomplish multiple functions from each of the topics or categories. : y# P$ V8 G( v; V
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The four categories include:
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, v4 W t& m; T/ S1 s1) Starting the Motor
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$ v3 x7 G" }) I* k: J5 MDisconnecting Means ; P: T T, y) D3 B2 G2 Y- [( i( G
Across the Line Starting , I, c" ]7 M. O; ] X. h
Reduced Voltage Starting
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. z- m( |& k' F) U" Z2) Motor Protection ( [6 Y) r: N- b
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Overcurrent Protection
( N2 Y: ]5 F( {$ V2 _; ]% rOverload Protection " j2 O7 |' O" ~6 s
Other Protection (voltage, phase, etc)
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3) Stopping the Motor . Z# ]+ M& a; Y( C
) U& ~& N8 I3 L- P/ q; n$ p, [Coasting
( g; B' K' W1 E, }Electrical Braking
/ B/ a( I& V9 ~5 a rMechanical Braking
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4) Motor Operational Control
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Speed Control
2 l: x: c3 Y. e% O0 e A0 U/ zReversing 4 }9 ^" O) ?5 Y; X" P' M
Jogging
3 H* x0 Q4 h" ?2 y. l8 s' P8 ZSequence Control |
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发表于 2009-6-19 21:51
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