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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
- z/ |" m7 o6 f9 H6 U) itheir uses and limitations becomes an important part related to reliable operation and protection of 5 r! d' E1 i7 ?# m2 }
the motor and the personnel using the motor. - x: f# Y5 W5 [& I9 t0 `
# e* M% s) q n7 j# j- UMotor Control Topics # R* M$ F2 `/ I& a( G4 U* w
; T* R" q8 q$ B1 [There are four major motor control topics or categories to consider. Each of these has several
E8 J5 F, e! I A8 B* _* w& wsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
- S4 q4 W% x+ {, ycontrol equipment can accomplish multiple functions from each of the topics or categories. : V8 K9 ?( P; u8 z3 Q/ Q* T9 Q E2 V
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The four categories include:
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2 b8 ^" a/ N' ?. Q1) Starting the Motor " q: I" W) U, V& M2 T, e0 x
7 K3 r2 L+ r2 R5 f' E9 Y% FDisconnecting Means
3 z% Y# L+ u& J' S p MAcross the Line Starting
: V( \( O+ s, u6 m8 Q. s* sReduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection
6 F0 |& D4 `# `- B8 m7 o! dOverload Protection ! c" ]+ g7 Z3 Q K. z" R8 ^: L
Other Protection (voltage, phase, etc) + e" e* t' `$ O6 ^) @% L, V$ j" ^
Environment
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3) Stopping the Motor ( Z$ A. r3 s- C# [& R8 L
9 i ]! N% B; S rCoasting
" i! n5 A6 s3 j" J8 L) i: JElectrical Braking 6 f' i4 q! m7 ^: f& {
Mechanical Braking
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5 V6 q, f# j6 ^. }8 n4) Motor Operational Control & C6 O6 e) i5 J4 Y x0 g
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Speed Control
6 A5 @- {* x, l! H+ B3 f# x+ ZReversing $ ^( y1 k1 p0 j6 V, u
Jogging 1 \: J* _: z0 \+ ^& X
Sequence Control |
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发表于 2009-6-19 21:51
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