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ELECTRIC MOTOR CONTROLS
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7 c/ J4 y5 h6 W" fOnce the proper motor is selected, understanding the many various control devices available and
: Y% ~5 W. r4 Z$ p% dtheir uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics 6 N6 X; P7 y# Y3 M: i
: J" Y, ]1 {+ L2 O1 W; r3 Q) L: pThere are four major motor control topics or categories to consider. Each of these has several 1 o& s! W4 @! Y5 K- J- ~1 g
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 5 N5 n. L8 b5 U; |" H0 G s% O* _
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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8 d; L$ P4 i ^1) Starting the Motor
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Disconnecting Means : s0 R$ L. Z) L$ C" d
Across the Line Starting
4 w% ~7 d9 _1 W7 lReduced Voltage Starting
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2) Motor Protection 8 ?: W1 e7 w3 G" g* i+ K
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Overcurrent Protection
9 G% y6 L- s- u4 x7 i1 s- hOverload Protection 5 ]6 }, @4 W% o9 m. _
Other Protection (voltage, phase, etc) : f2 ~2 v& E/ N# y, g$ D
Environment
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9 }6 m4 ?% z) V$ t$ {3) Stopping the Motor 3 y9 S$ T/ s$ @, e. \
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Coasting % O2 B$ Q9 G4 ?
Electrical Braking
- p9 E. A T' b5 V$ zMechanical Braking # D, G# P& g4 K8 Z) l. z
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! \# u) a+ ?" D. u4) Motor Operational Control : D1 H. v8 W5 Z# @% @. w& j
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Speed Control
4 y+ k5 _. b/ H9 V3 ^8 rReversing
1 @* G" B. G1 V( h2 P) sJogging & ]+ Y6 e1 c; n k5 ?8 s
Sequence Control |
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发表于 2009-6-19 21:51
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