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ELECTRIC MOTOR CONTROLS 2 d+ Q' [9 B3 I# P
$ p. F0 Q* A0 C4 D u/ ZOnce the proper motor is selected, understanding the many various control devices available and
8 i3 r6 A1 A& [their uses and limitations becomes an important part related to reliable operation and protection of : X; }5 {( c/ t; Q; i
the motor and the personnel using the motor. ( C: G. A+ h x# g4 D
! t3 W) [( j+ T# W- b3 G4 `& SMotor Control Topics
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# m+ I6 r7 T% M% DThere are four major motor control topics or categories to consider. Each of these has several + _; O8 e( @/ W! n, m- [! q4 X
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 Y. Z6 G* M/ {* Mcontrol equipment can accomplish multiple functions from each of the topics or categories. $ k% u. Q) Z# _2 D8 ]
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The four categories include: 6 ~. c+ m: k+ \7 @) k3 J
0 D# U! D+ ^4 n3 F* j/ f) d1) Starting the Motor 0 J7 L2 r* Z: Y/ ^2 I
4 w, [' f; `0 {* W' T! }: t/ Y0 mDisconnecting Means 8 }) N% Q4 H# H# N
Across the Line Starting
) z9 Y7 t" m0 a( ^Reduced Voltage Starting 8 P5 u4 @- E' h
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2) Motor Protection
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3 Q0 v- `* r; v- R7 P' DOvercurrent Protection
C5 f+ |# j) r3 A! kOverload Protection
. f: v6 s" R6 G3 I7 cOther Protection (voltage, phase, etc) 3 E7 X' [4 v* M, l7 M$ [
Environment : n& S8 ]% |& Y& S+ t7 n r
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9 r5 I4 [9 P& O9 [+ D! c, W3) Stopping the Motor
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Coasting
) u: W5 ~1 A0 Q- GElectrical Braking ( M* n; [- n/ w$ I$ b
Mechanical Braking ! a; e! l4 p% T, |. A# \
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4) Motor Operational Control N/ L- [; i$ q5 R7 }
; J; r. _% s* n* ], s0 a( PSpeed Control
5 h( A: V$ f Z; D3 `Reversing
0 c6 g6 k- Y3 v/ S# C3 h! rJogging ( [% R+ A _! W" V! m7 D: O
Sequence Control |
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发表于 2009-6-19 21:51
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