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ELECTRIC MOTOR CONTROLS 0 e+ B9 l+ c4 X( N; a' y5 j
4 l' W* t- Q& \. T; E$ k9 J. ?1 |Once the proper motor is selected, understanding the many various control devices available and
% F8 o1 W4 r# {8 t; x" F6 F# Ttheir uses and limitations becomes an important part related to reliable operation and protection of
J" I7 n* W& H' uthe motor and the personnel using the motor. ' \% Z8 H5 }0 z7 W
5 u% D% U1 y" s( h/ E" ~6 K! x. @Motor Control Topics
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" O) G/ p: R7 n# B% H+ IThere are four major motor control topics or categories to consider. Each of these has several ! h" `* Q' j1 `( M
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ |3 E. f% {7 U( {3 Icontrol equipment can accomplish multiple functions from each of the topics or categories. * V; b e% ]# [# n I
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The four categories include: Y* }; m( f& L7 f
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1) Starting the Motor 3 d$ h+ V: A! t' H% Y4 Z9 B. d8 Y
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Disconnecting Means - h' G; O- A. \2 f& G
Across the Line Starting
; P1 l7 }9 T: p$ V a# P9 u/ YReduced Voltage Starting 2 A# L- u; G( V6 w
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" N( |( n" E2 N/ x8 C$ a2) Motor Protection # n& u$ ~( D- }+ U+ l
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Overcurrent Protection
9 x: X# f" I, I0 LOverload Protection 9 \ `, e: W7 W- s
Other Protection (voltage, phase, etc) ; Z% W) v5 g; N. V
Environment
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3) Stopping the Motor * d& C7 [ ]; d) W' r0 N
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Coasting ( ?" q* k1 O8 f
Electrical Braking
5 Z, F) n. W, ]6 D% T4 B. NMechanical Braking + @* X) }/ q- I( d0 O7 h
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$ M. M& _5 ?, c+ L4) Motor Operational Control
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) O8 g) j/ p( VSpeed Control ! }/ E! u }- n2 z' P
Reversing
/ ?& G; q1 j/ Y9 C' o, Q, IJogging ' u9 |! E2 o; @* n) x1 R% o
Sequence Control |
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发表于 2009-6-19 21:51
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