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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 i9 `5 }% a& i
their uses and limitations becomes an important part related to reliable operation and protection of 4 C; [2 G, z9 L' n& n
the motor and the personnel using the motor.
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Motor Control Topics # o7 @9 F* r/ c0 y( a
$ V* F6 i) u9 f3 y0 dThere are four major motor control topics or categories to consider. Each of these has several o. D4 i( h" b4 ]* ]3 p# J
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ; _. }, Q; d/ d$ b- h
control equipment can accomplish multiple functions from each of the topics or categories. ' p( u6 l1 H6 n/ p u+ \) ]: P* Q
\- G/ x/ C! P# J7 H) kThe four categories include:
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. P" R3 F! Z& c! E3 m3 u. o1) Starting the Motor
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Disconnecting Means , @# o: D5 ] m- I& J0 @& ~" P
Across the Line Starting 0 C/ d2 c, h. S
Reduced Voltage Starting ) P' {, S9 |2 a7 f {0 I. X0 W! q; o
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2) Motor Protection 5 m `/ X2 [) Z) F& X5 U& m& J
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Overcurrent Protection
& S6 n2 ?: y9 W9 N% ?" wOverload Protection
) {& E: L% K( J& ]$ nOther Protection (voltage, phase, etc)
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2 {' K5 s0 @, n" H! a2 W& x' y3) Stopping the Motor ; c0 z1 S( e. ?" B! l0 G4 ?8 f
0 c' B6 L% ?' `6 T! T% fCoasting 8 T; s1 H5 L2 h& m
Electrical Braking - j9 Z' ]6 K2 b f7 ~5 _
Mechanical Braking . I5 k0 N7 ^" Y/ {: I0 Y. U
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% L" w- [- m& b2 K: \4) Motor Operational Control 2 Z' [% Y; Q9 r- S% |% M. x! P( X" z
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Speed Control
L& a$ H4 Q% U+ rReversing
- U# S. I3 _" U% u, l) W H7 LJogging
( N# z9 \" y: O+ `6 `. qSequence Control |
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发表于 2009-6-19 21:51
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