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ELECTRIC MOTOR CONTROLS
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0 w& E6 ?( H. G5 G+ e2 vOnce the proper motor is selected, understanding the many various control devices available and
, r M k+ y5 m6 G8 @' v0 xtheir uses and limitations becomes an important part related to reliable operation and protection of
% R( j( D0 U1 Y$ M$ ?8 Zthe motor and the personnel using the motor. 0 j/ g' H Y, m' Q, t. k0 E4 i8 b
: Q' _0 X$ |) }: D5 h( o dMotor Control Topics 5 ?8 B+ D/ M% K' w4 R; I4 i
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There are four major motor control topics or categories to consider. Each of these has several
3 @7 x* A4 x% B2 w2 Jsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
. \) z, g" t& h1 f1 X) scontrol equipment can accomplish multiple functions from each of the topics or categories.
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3 J' z) r: C X5 h. x( E0 FThe four categories include: ! T. X# ^: s" H0 t
' R- {, {+ }- A6 Y2 h1 j( S1 M1) Starting the Motor , l4 P9 A4 q$ {7 x# b. m1 B3 G
6 g# e c- l( ?4 Z: @- h% nDisconnecting Means # P+ Z |9 N8 k! {; H
Across the Line Starting
0 W s1 F' |$ C) N( ?- C" X& |Reduced Voltage Starting ; t6 j) L D% Z$ @& J: j$ m
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2) Motor Protection
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Overcurrent Protection ; V) N/ L% X* E
Overload Protection . A/ D6 \( |8 d, B( v
Other Protection (voltage, phase, etc)
5 k5 S, F' W: o& A1 Z) u: G0 [Environment . S! g3 G0 [0 z; P; Z" z7 ~' P
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/ k- c- t! x- x; {3) Stopping the Motor + Q6 D# T% ]2 C
( N- d% B# b. u6 h! t% D: dCoasting ' i1 l- f {( d; B
Electrical Braking
- K* a$ ?9 V$ G, }9 HMechanical Braking 8 S' L. Y9 }2 p. e+ ]4 k7 |3 c( G M8 L& r
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4) Motor Operational Control
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Speed Control 8 b" ?# ~* U; B/ H7 ], k5 N
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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