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ELECTRIC MOTOR CONTROLS 2 I) G1 }! ^3 l+ X
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Once the proper motor is selected, understanding the many various control devices available and 4 \4 K: O0 i; m3 s$ |( R u' S3 R7 x
their uses and limitations becomes an important part related to reliable operation and protection of
, M X$ K2 f# o6 b8 G' Xthe motor and the personnel using the motor.
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Motor Control Topics * D p: L% N3 c! s
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There are four major motor control topics or categories to consider. Each of these has several ( F7 A H' ~) `' E
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor # K# N+ D, d; ^9 I) _5 e
control equipment can accomplish multiple functions from each of the topics or categories. 6 n$ I3 V5 Y! ?9 N# {. J; ^
# R$ z/ A* [) ^8 J. W' R5 ^$ \The four categories include: 9 Y) d6 G' G( J( D
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1) Starting the Motor
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' W8 O/ E8 o0 E# ADisconnecting Means
[' K6 ^% K0 Z3 }9 hAcross the Line Starting
. |+ s. W+ Q1 |" yReduced Voltage Starting
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2) Motor Protection - o8 ^0 l1 P) S! B
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Overcurrent Protection
4 T8 D p8 B* g7 [3 P- ~: I/ FOverload Protection ( L6 S2 {, W5 N# d$ G ]; S- L" q0 U6 ]
Other Protection (voltage, phase, etc)
) I0 c/ ~( Q$ cEnvironment
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. [% [1 s b8 d3) Stopping the Motor $ Q M0 b+ K$ n# Y* o9 w
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Coasting
: D) V+ W) x- ? E6 JElectrical Braking
- l$ j. Z3 `+ S# ?, T7 ]Mechanical Braking
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4) Motor Operational Control I' i4 ^% ?% f. h& S0 j, z9 b
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Speed Control * s& G; [6 `; Y0 W8 Z
Reversing 9 w) D0 o: s/ `
Jogging / |3 H ^1 c# J' p/ L1 s
Sequence Control |
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发表于 2009-6-19 21:51
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