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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
' ^) _+ P7 M' }+ ^" J0 Jtheir uses and limitations becomes an important part related to reliable operation and protection of ( ^' u" q, d6 {9 a4 R8 k- S
the motor and the personnel using the motor. ( w, H* O- j: x- D$ Q, J
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
* G2 Q6 q# r5 ^: B( G. F4 ~subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ; V6 T0 @' q+ Y& m6 W: k- j8 j6 C
control equipment can accomplish multiple functions from each of the topics or categories. . v2 `7 Z5 A: [: t
! @7 } J+ t- l/ y/ ^The four categories include: * G- E, X5 R+ o& i6 J
) z$ x0 n8 ~! R( W, @1) Starting the Motor
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Disconnecting Means
+ I! K& Y' q+ @4 ]! [. Y" k% IAcross the Line Starting
7 p6 f( \- q. Z6 l/ eReduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection
! h c1 f3 r, A: uOverload Protection - N+ r% E; H* ]' ?2 L7 K1 }
Other Protection (voltage, phase, etc)
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. J ]6 x3 E, o6 \& F3) Stopping the Motor / [9 W, m" W# F. t3 c
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Coasting
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Mechanical Braking
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4) Motor Operational Control + t, E8 }7 B+ H9 {
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Speed Control 5 T0 K7 `. a& n9 U6 d
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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