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ELECTRIC MOTOR CONTROLS ! v0 L* U3 y$ ^# H, [7 K* B3 l
5 G! t! h w! t0 \" hOnce the proper motor is selected, understanding the many various control devices available and 6 m5 _# A3 m0 H+ H9 Z0 a1 j
their uses and limitations becomes an important part related to reliable operation and protection of
& e: m8 v+ I" b) S' I) fthe motor and the personnel using the motor. ' G$ ` b' n1 a1 H3 X4 X) t
6 l$ Q3 s( Z( E/ [% BMotor Control Topics 5 r3 q5 {. Y& w# U# m2 s7 U- Z
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There are four major motor control topics or categories to consider. Each of these has several
& A6 C/ {# G$ L; Zsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
$ A( w( N* X3 B- z& s% P$ D8 Lcontrol equipment can accomplish multiple functions from each of the topics or categories. - S' b% D1 Q1 p) A+ V
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The four categories include: , Y$ t3 z: Z9 k c" Z5 E7 M
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1) Starting the Motor % j5 i, `4 m; Z9 b, K0 T- s
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Disconnecting Means
9 W7 N8 M0 y3 j3 m6 U. ~; _! F2 GAcross the Line Starting
. t% [" F Y( W! BReduced Voltage Starting / {$ x" V, ^6 h1 r
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2) Motor Protection
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Overcurrent Protection + o; e* O, S0 q8 ]
Overload Protection ' C& y3 i+ D3 {
Other Protection (voltage, phase, etc)
9 h6 P4 E4 d' o5 ZEnvironment 6 j. o1 }; b" {& J' U- s( \
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3) Stopping the Motor
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Coasting
0 Q- X$ C3 f: X2 E. t( AElectrical Braking # h7 k# h: L. |
Mechanical Braking
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4) Motor Operational Control ' Q0 b1 x! g* I2 _8 f- A: J' D
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Speed Control
$ z- a6 t! Y7 p! C1 t+ |Reversing
$ S& }+ K5 ?- [& k$ ~Jogging 5 ]) P; ?+ l4 q* W$ B
Sequence Control |
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发表于 2009-6-19 21:51
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