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ELECTRIC MOTOR CONTROLS % I) \. h1 f6 f7 r& [1 w! |
% Y1 x" u& D9 }9 G. c4 u; }Once the proper motor is selected, understanding the many various control devices available and
% C$ x1 U4 O; u. mtheir uses and limitations becomes an important part related to reliable operation and protection of ) H3 W9 Z/ y7 X3 I
the motor and the personnel using the motor.
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: T& {8 `, |9 |& z' k. I! g& o* ?! sMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several ) ?( O& E7 X: P# Z
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor $ A7 _/ Z4 A1 Y
control equipment can accomplish multiple functions from each of the topics or categories. ) R7 \6 C" H# S) t. j# i7 f6 s9 b
( d, q6 j1 F7 T7 VThe four categories include: % t' }1 W0 s2 D) p, Z; k1 S
- [" K0 ?9 e" _/ {: b K1) Starting the Motor : p7 o% V* n' G$ `" q. q
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Disconnecting Means 9 b7 F0 F8 Z. W) q7 ^8 b
Across the Line Starting $ F$ E0 d; f9 l/ K
Reduced Voltage Starting 5 u8 x, e/ t n; D' K7 Q1 M
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2) Motor Protection
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: u1 X; _/ f5 G! d8 vOvercurrent Protection
& h/ a, H, m* \7 J, d6 _Overload Protection
4 O7 Q2 \8 n. y# W: s! M. wOther Protection (voltage, phase, etc)
' ]! {: Y- t1 z+ _$ LEnvironment
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: \, l0 B- o5 }4 ?' R$ F3) Stopping the Motor
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6 M' @3 c$ o hCoasting
' d& [5 k" j5 \6 |Electrical Braking
* d) R( m4 Q# `3 M" x0 P' `Mechanical Braking 4 H, F3 D) B/ S* \; s) C( q
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4) Motor Operational Control
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) \2 p( ]4 c0 ]; I: KSpeed Control
$ M8 v& R9 J$ o- d3 QReversing ( A }6 X+ I. a* }
Jogging
7 |: W9 W/ d& m% F( K$ K X- @Sequence Control |
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发表于 2009-6-19 21:51
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