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ELECTRIC MOTOR CONTROLS - w2 n% q" I* x# I$ m K- R+ z; u) N! j
. [$ A8 X, ^2 G3 j' p2 COnce the proper motor is selected, understanding the many various control devices available and $ m1 f, u: `9 V2 t( ~/ P
their uses and limitations becomes an important part related to reliable operation and protection of
3 n, V) Y/ a. C3 A9 d2 `the motor and the personnel using the motor.
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j: m: T1 m; I' QMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
B3 P" s. y+ U: p2 U* t4 ^subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
" g" T" d l7 U% c; ~* dcontrol equipment can accomplish multiple functions from each of the topics or categories. # }/ [3 _0 N' d' @3 ]# e q
4 j' {% C$ \( dThe four categories include:
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1) Starting the Motor
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. R' ^) {8 x: M6 g8 j# ~Disconnecting Means
! b: ]0 M/ r. s9 P! H: I: o; `Across the Line Starting 0 I) x( B$ B* ^3 H" F( @) z
Reduced Voltage Starting
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m1 ?" p( \1 a& H9 [2) Motor Protection
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Overcurrent Protection ' C) V6 h) C2 a0 V/ L4 u+ {7 B N
Overload Protection
' i8 m" J8 ]4 s4 X. E6 i3 UOther Protection (voltage, phase, etc)
" N- c4 c3 U! u, K- o+ LEnvironment - |5 N( Z& q( Q/ F5 |8 ?. D! Y* V
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3) Stopping the Motor " ~$ ?: u3 C( y0 ^# w
/ {& D- C6 w: C+ P! u+ ACoasting 3 c2 y; o1 n9 ?. P H2 A; {
Electrical Braking 4 x# d* k/ H% f3 X0 D) s
Mechanical Braking
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4) Motor Operational Control
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Speed Control
1 ?- d; _: j2 P( L3 AReversing
2 m3 w; k. W9 E: I! O' s* `Jogging
4 A( F6 ^! }' `/ z# b# zSequence Control |
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发表于 2009-6-19 21:51
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