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ELECTRIC MOTOR CONTROLS ; o6 K3 T3 D/ [: T1 T8 i/ e
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Once the proper motor is selected, understanding the many various control devices available and 3 e& O6 K" R) z# k
their uses and limitations becomes an important part related to reliable operation and protection of
( O' Q/ g' v0 }the motor and the personnel using the motor. 7 {9 [( B% U& H" n+ }, R0 ]
. w w* K4 h) A# \( W# \Motor Control Topics ! j0 C) H( d& Q* \
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There are four major motor control topics or categories to consider. Each of these has several
6 y6 z- z* l# J: F' v% Hsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor - }' f- Q7 O8 V2 L# t
control equipment can accomplish multiple functions from each of the topics or categories. 5 g, O. X, R" G# \
a& N. v8 n; S8 F2 b# {The four categories include:
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& q$ j$ O, f- B; M; k" n/ h1) Starting the Motor
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Disconnecting Means / L; a6 T# Z. z9 L- `# c- O
Across the Line Starting
1 O. R) ]7 v8 i( GReduced Voltage Starting 7 d- y% H8 n: ^
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2) Motor Protection
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Overcurrent Protection
+ P8 b" l) q7 m- {& C- yOverload Protection
. N) B5 f [) E2 `1 OOther Protection (voltage, phase, etc)
+ A' O' f$ N0 P* e* u h# I+ `6 GEnvironment
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3) Stopping the Motor 3 V, x' H# I$ ?/ }5 @
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Coasting 6 E+ L3 ^2 [* v9 P" \9 c% X, \
Electrical Braking
, I c9 z% R- Z T% p& UMechanical Braking + A& T' U8 H$ X2 j/ ^6 K$ j0 ^
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4) Motor Operational Control
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Speed Control * o" u5 |+ U+ I2 w9 b5 W/ x
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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