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ELECTRIC MOTOR CONTROLS : y1 U( |9 O4 c- Z- T( x# E
2 r- _) V( ]( aOnce the proper motor is selected, understanding the many various control devices available and 6 f, j: _- E% O! s
their uses and limitations becomes an important part related to reliable operation and protection of 6 F' ]0 T4 T" n& m0 q, e
the motor and the personnel using the motor. 0 z+ h$ v! a+ _) F( a6 {, f
& C7 U: w+ \4 ]) ~+ } e) L8 d6 dMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 5 X9 ~" H1 [) N4 l, u9 ?9 [9 [
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 7 t2 I/ \/ f/ v: P# o9 H& m
control equipment can accomplish multiple functions from each of the topics or categories. + p" t! x) W: v
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The four categories include: " _# |4 S8 b. h8 w) e+ ~) \
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1) Starting the Motor
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) Z( p4 b+ J ]% t0 M$ H5 P* sDisconnecting Means ) H5 N1 y: a1 m9 p5 G- u0 Y
Across the Line Starting
: p' A4 I5 i6 a& wReduced Voltage Starting
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2) Motor Protection & m, A$ o& R! F0 M
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Overcurrent Protection
3 g9 h) [1 q( O( Q1 LOverload Protection 9 \ D W: Y$ V5 R. g
Other Protection (voltage, phase, etc)
0 L3 E& O! Z% t$ A2 F* @1 S1 |Environment & r8 t8 J; }) r; V9 M( I
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3) Stopping the Motor
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6 D" b6 B9 }3 k7 d1 uCoasting
) ~+ B4 I+ x# I eElectrical Braking
' q6 S% \% G0 A4 aMechanical Braking
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/ L0 z& G# C6 n; w9 l4) Motor Operational Control 5 s/ M! h ~8 m$ v
& g5 X, w* I5 H- \, s9 o2 \# \Speed Control
( V# I8 d9 p. A& X0 HReversing ' @% f0 \5 |6 U/ f1 \& O+ Q! @
Jogging
7 k, F* r; @- P+ j( q& SSequence Control |
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发表于 2009-6-19 21:51
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