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ELECTRIC MOTOR CONTROLS 1 k, W' t% Z B
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Once the proper motor is selected, understanding the many various control devices available and 2 a) Y% z) v* |- ^# x" j
their uses and limitations becomes an important part related to reliable operation and protection of
: w0 Q9 s& m& |7 ~4 i, U' Rthe motor and the personnel using the motor.
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+ l' h% }% [- ]2 H& n: a$ CMotor Control Topics
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: g* U" E) R9 ?! q; Y( MThere are four major motor control topics or categories to consider. Each of these has several / Q, A; \$ a K3 Q) b; A8 L
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 4 }; ~$ U4 {7 |- C/ u7 F: C# ~
control equipment can accomplish multiple functions from each of the topics or categories. % U" F: c9 ~: P2 H
! W- _" o5 f pThe four categories include: $ g7 J7 |8 r# p* L3 m* p
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1) Starting the Motor . Z' A; N1 K/ w: X6 l; a' C* o
9 ?% E2 N) V9 A W# v- F1 UDisconnecting Means - ?4 o1 \6 W4 c! q4 ^
Across the Line Starting
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2) Motor Protection + ?9 B, F+ P" t1 l2 {, t
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Overcurrent Protection 8 E) ^5 k% v7 s2 h6 _
Overload Protection
) O* j4 I; e7 J7 Z9 \Other Protection (voltage, phase, etc) - m/ Y8 ?! K. ^ h& {
Environment ( ~- ^# N; S" C
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3) Stopping the Motor
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. M7 \( ]* q+ W. G( ~Coasting
9 }$ p+ k/ M/ r! X7 f cElectrical Braking
8 N& Q& I5 O/ p( `1 NMechanical Braking 7 I3 k$ u3 y* M H
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. s4 W5 o8 w' v% e4) Motor Operational Control
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Speed Control + I$ o' \) Q1 s
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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