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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and
( w7 B5 t# Q( l* Ltheir uses and limitations becomes an important part related to reliable operation and protection of
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1 a4 I' X& y7 e9 k/ cMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several ) E# N: U+ B, \+ I; e* ~( X2 s( d
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 8 S- Q) x3 T7 Z) K% @/ m
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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8 V$ [* {, g x# N3 ]1) Starting the Motor 9 j8 Y3 ~; L7 u
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Disconnecting Means 9 @ L4 b! E8 ?" N
Across the Line Starting & o8 A- g4 E7 z3 I8 i7 a
Reduced Voltage Starting - P) D+ L. J1 E
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2) Motor Protection
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$ R' @7 m5 |1 H g! n" e, B" @Overcurrent Protection
2 B; f1 k; d! u, C9 eOverload Protection
8 ~ I, Y) `8 q! J% ]7 `Other Protection (voltage, phase, etc) 0 ~- @$ ^( ~* ?% O
Environment 6 r! ]% Y9 c; Z( Q! I0 G0 @1 D) E4 Q
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2 q( \; _6 Z1 T& f3) Stopping the Motor
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" y, h; u4 @. a% i, Z& p9 G E- CCoasting
9 Z9 { ~( g6 i D6 K0 C" ~: WElectrical Braking : H. I7 B6 P2 c+ d9 q
Mechanical Braking
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% J! l7 c* q( ]4) Motor Operational Control
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$ g( `( q9 t. _/ X' [1 ?$ O) BSpeed Control 1 R! f( Q# p! P' g' [/ L
Reversing ' H1 g9 d1 X/ `; A1 M9 k
Jogging * e9 F( j/ A1 R/ ^; Q
Sequence Control |
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发表于 2009-6-19 21:51
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