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ELECTRIC MOTOR CONTROLS / k1 S7 S* M2 R& S9 L. n
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Once the proper motor is selected, understanding the many various control devices available and + X' h- l5 T( P1 f1 N8 w' t1 t
their uses and limitations becomes an important part related to reliable operation and protection of 9 g) X7 ^& F9 Y2 F- J1 c: c
the motor and the personnel using the motor. ; P) Z! V! c+ C4 C* Y; C8 g9 E
/ p' O0 r- f& D' _& jMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 2 T9 [% F) R. ~4 E4 i2 }9 f
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
6 H' u+ P- V6 Z* G# lcontrol equipment can accomplish multiple functions from each of the topics or categories. + v4 x2 t& _" u, o6 X( Y
% C0 d" E7 ?/ n# ?/ |- ^+ Q& h* ?The four categories include:
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3 n5 A% `; Y1 y9 [+ `" u1) Starting the Motor
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% y' R* W" Y6 C/ B$ G' D kDisconnecting Means 0 H' K( D# x0 Y1 e: P+ F
Across the Line Starting T) T7 V0 K7 z
Reduced Voltage Starting
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$ e7 l; ]; c# q* `* V0 {. \: ~2) Motor Protection : H5 J G$ O s |
7 f6 B, t7 [- P! p2 ZOvercurrent Protection 0 j( e; N) O$ D: \
Overload Protection # ]7 D7 T) Q) o( \, n! L' h" j
Other Protection (voltage, phase, etc)
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3) Stopping the Motor
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Coasting
. v* @( |3 G/ I( }# r! JElectrical Braking
4 `9 n" w# f% kMechanical Braking ! q4 n; j" ~5 Y. E. p
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1 [; F4 c% S$ z! E) C# R: H; V4) Motor Operational Control
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; Z' s2 M' S( X& T' qSpeed Control ( m2 w# z6 h2 z2 N0 L1 y3 ]
Reversing
! V- i: ^% |& q# FJogging
# v6 p/ I' R- O" p/ c) \0 ]Sequence Control |
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发表于 2009-6-19 21:51
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