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ELECTRIC MOTOR CONTROLS + n/ P3 ?- O7 F2 {- D' A$ b
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Once the proper motor is selected, understanding the many various control devices available and * p5 L5 l5 Z, V! G; o8 h9 V6 y9 |# b
their uses and limitations becomes an important part related to reliable operation and protection of . ~' ~! L( y% h
the motor and the personnel using the motor.
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: v* O4 G- ?* K2 ?5 S! tMotor Control Topics " i: p. h( X) {5 o; w. D6 F, \" f
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There are four major motor control topics or categories to consider. Each of these has several
i( m% x4 [9 ^) \subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
4 k' w3 A- k4 A4 _# Scontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: & v2 o) ~2 \- a c2 N* k9 Y
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1) Starting the Motor / H, j7 o) ]9 S, _: y) h
# S- C- {7 `* q2 }( p1 p T# iDisconnecting Means : j3 k4 l0 v: e7 M5 b
Across the Line Starting
. S4 C) ]( T2 h# q; KReduced Voltage Starting
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2) Motor Protection ; Y' `3 N$ o7 n$ w. B! Q
, F9 M8 G$ N+ l7 A6 l- _1 y; t' HOvercurrent Protection ; L; Q& ]1 x9 m. k
Overload Protection ) }* W, }6 W, G- n1 O: G5 D4 q+ R
Other Protection (voltage, phase, etc)
8 k! c; _+ y" X1 \3 @Environment ! ~+ M k r: u) K$ A6 v& j
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9 T9 l/ X; L! i7 K3) Stopping the Motor 9 k$ Y3 Y! v2 q9 q, ]
7 E7 M8 z( y* u% UCoasting & ]# v( N: b6 G9 w4 C: z
Electrical Braking
( _9 K4 P5 H6 K1 [. i8 ^Mechanical Braking
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4) Motor Operational Control 7 a, n% G5 `) w: X
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Speed Control
. L1 J) X+ f# JReversing
' q: K9 R" p9 `. v% |4 Q$ ?) ~* ?Jogging 8 ]; p( q) Q" T: f
Sequence Control |
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发表于 2009-6-19 21:51
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