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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
5 l' q% {( s; g' D6 Htheir uses and limitations becomes an important part related to reliable operation and protection of " ]8 @/ p' K9 {* g6 @) s3 n
the motor and the personnel using the motor. ! s0 ]* h2 n% u" ~
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Motor Control Topics
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. Z. v4 \3 L5 I4 f# c3 ]+ J& WThere are four major motor control topics or categories to consider. Each of these has several / o/ G$ T2 I' D' S' _2 J
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 4 `4 g2 N: j7 | F
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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, m) x+ `. K5 @2 g0 ]7 V! P. c1) Starting the Motor
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3 B+ }5 b0 q7 W1 IDisconnecting Means 2 K6 `; C, ~( Q) z+ ?4 \
Across the Line Starting
& X& v' c* ^' ?! J( m* }Reduced Voltage Starting
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7 r. {4 N! L* ^3 X; [$ I2) Motor Protection
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9 M9 N/ G$ |3 Q8 }5 t) AOvercurrent Protection
7 Z/ @. N4 {0 jOverload Protection " J4 y8 v, u" S! b; d! P
Other Protection (voltage, phase, etc)
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3) Stopping the Motor
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- W. g& V1 P/ X9 OCoasting
, n& `( |+ Q3 F! vElectrical Braking 2 i; X4 z' [) }' o1 C. P( v
Mechanical Braking
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9 z: o$ r3 R3 |3 l) y0 P4) Motor Operational Control
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D, a. a R( `, y; V& GSpeed Control y) ^ n$ U c" ]+ {
Reversing
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9 t3 ]# ]9 r( U8 a3 A! BSequence Control |
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发表于 2009-6-19 21:51
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