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ELECTRIC MOTOR CONTROLS
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A7 Y2 T" o; o3 {- e/ w% \6 [4 POnce the proper motor is selected, understanding the many various control devices available and
) N4 R) p# k$ {. ]) Rtheir uses and limitations becomes an important part related to reliable operation and protection of 5 ^) ~: q; b4 y
the motor and the personnel using the motor. 4 o) s3 q* Y$ |7 Y+ ~: r- q
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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
% m- s3 S1 K2 g ^' A4 fsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
! ^0 K) l6 @0 ^' W' K! @) g3 `control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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9 s9 l4 Q q p) {8 f$ Y w* I+ J0 B- A. m1) Starting the Motor . ]6 Q2 p4 m& \2 z; E
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Disconnecting Means ! v" |' R7 W% C+ J3 K4 [
Across the Line Starting
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' y5 y2 ]9 z2 l- b2) Motor Protection
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Overcurrent Protection
8 m2 A0 a, f0 t3 M* T I; ^Overload Protection $ s' ^; l1 M C5 Q
Other Protection (voltage, phase, etc)
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3) Stopping the Motor
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Coasting
0 y$ D; j5 U0 u; qElectrical Braking
3 w6 I" j# g. O- LMechanical Braking & B2 L0 t, x" G8 i3 F" H
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3 c/ W: I6 W9 u) z \0 Y5 i4) Motor Operational Control
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4 K5 N9 |& v/ y6 M0 aSpeed Control
0 Q5 T- [2 j% Y9 d& l, XReversing 1 R) l3 L9 x& ?/ F o
Jogging , @" I2 F2 @( j6 b1 v
Sequence Control |
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发表于 2009-6-19 21:51
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