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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
m. K7 P. I3 R9 [their uses and limitations becomes an important part related to reliable operation and protection of 7 T: r- V ~) Z2 S; v! t
the motor and the personnel using the motor. , \0 v3 r* g# O, u) _3 y
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Motor Control Topics
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X# [; A. s; o2 i7 e+ [0 L x3 NThere are four major motor control topics or categories to consider. Each of these has several
! x7 i# n4 L! T4 z/ i9 V) L, G2 ^subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
& f% v0 c: n) ]7 z6 pcontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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+ w' z. F4 Y+ c5 L$ F# q. x1) Starting the Motor
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" a& b& H, n& m8 W4 c( MDisconnecting Means # d% O# V" i V9 A c
Across the Line Starting 5 I4 ?/ q: u4 ]" L
Reduced Voltage Starting
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2) Motor Protection
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: P- |. `; N W( P& vOvercurrent Protection & w# }/ N0 L5 |7 h
Overload Protection
; O; H, t& \& @1 p' COther Protection (voltage, phase, etc)
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3) Stopping the Motor
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Coasting - g. h, t% S" A, J$ g/ ]6 R- L
Electrical Braking , a3 L0 q1 [. l
Mechanical Braking " C1 q+ ~: }+ ~0 z: o$ j9 Z
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) j& R: D4 C3 }" j( v( H4) Motor Operational Control
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/ _) \3 g" _! t9 ^) ?Speed Control
: U$ c! R- x/ z; W1 L4 WReversing # N) H, H! W( q2 Y( \- U; G
Jogging
! a. p% i" R. H+ qSequence Control |
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发表于 2009-6-19 21:51
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