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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and
# H4 M6 x' j1 m" J8 Qtheir uses and limitations becomes an important part related to reliable operation and protection of
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6 l+ O: O) R* O \3 M6 lMotor Control Topics
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* Y- B* R( ~6 K, JThere are four major motor control topics or categories to consider. Each of these has several
& G! I' v3 j2 fsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor . C" | n( U( q1 I& c4 @1 J3 {, W2 J1 j- B
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: 1 E5 ]+ p( h3 i0 u6 Q0 k
8 I( I7 h2 N3 I' b1) Starting the Motor ! R2 \/ S9 B) k8 N% f5 a% m4 h
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Disconnecting Means
* s0 J7 S) A! \* qAcross the Line Starting
2 m" ^3 Q0 n2 Y: g8 z' yReduced Voltage Starting 7 `2 h; \8 `6 O1 N7 F
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2) Motor Protection
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Overcurrent Protection . G' w4 d: _; Z( T* p6 F" w# @
Overload Protection 1 V! T2 I/ y. H
Other Protection (voltage, phase, etc)
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L: F# @2 L" B: P$ `3) Stopping the Motor * N+ v- ?+ @9 h! U# l0 g/ x4 f7 w
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Coasting 0 L/ u- m5 Y4 d
Electrical Braking
: \; _5 `9 V" m1 |Mechanical Braking
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4) Motor Operational Control
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Speed Control S) }5 z- {) R! |
Reversing " o! d' J# A5 l, p5 o
Jogging 5 d7 C* J3 z% m8 x& \7 o( x
Sequence Control |
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发表于 2009-6-19 21:51
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