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ELECTRIC MOTOR CONTROLS 5 i+ P( K0 b4 ]+ x) v& R* n) E
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Once the proper motor is selected, understanding the many various control devices available and
( ^+ s5 _0 D# R' utheir uses and limitations becomes an important part related to reliable operation and protection of
" K# `+ e9 i/ Qthe motor and the personnel using the motor.
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( c, K; J! z6 HMotor Control Topics
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( W( V( G* U5 HThere are four major motor control topics or categories to consider. Each of these has several 4 o1 X8 e5 _6 n1 x# M/ A
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
; [, C! @6 d3 }* {/ d6 [control equipment can accomplish multiple functions from each of the topics or categories. / T8 M7 h2 P4 _9 h
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The four categories include: - [8 E, y# [" J
" s$ e9 D ^8 G9 I o1) Starting the Motor : A: f# }0 }! m; g- b2 p% Y
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Disconnecting Means
8 E: \* t# Q9 r' Y" N+ F) ZAcross the Line Starting $ l D# l( ~1 x2 n. L2 X& {/ q
Reduced Voltage Starting * \! C1 r8 @2 C( \
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% d2 O6 `* B# o" k. V' ~; {. _2) Motor Protection
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Overcurrent Protection . M" ^9 { f! c1 s' i9 v
Overload Protection
1 G; P: h' ~ B# T- gOther Protection (voltage, phase, etc)
0 O2 d2 q1 E$ ^% YEnvironment % ?+ A* y1 l6 o8 t5 E" L" d) |
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- B: [/ A" q0 e6 Q3) Stopping the Motor
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Coasting
9 o2 D, w, K3 B1 _6 ?Electrical Braking , c! K3 J# P/ ^: d* d
Mechanical Braking 2 l9 s$ ?2 m) ?$ a
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8 g# q; Z& f) S( c$ O4) Motor Operational Control 1 D' ~/ ~+ q f
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Speed Control / l$ J" Y9 X5 h: X$ h, m
Reversing ! P9 U" H+ ~. s+ H( Y
Jogging
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发表于 2009-6-19 21:51
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