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ELECTRIC MOTOR CONTROLS , a; I' G; y6 y; X; i( [8 N
7 E6 r/ C0 v7 BOnce the proper motor is selected, understanding the many various control devices available and : G' T+ p/ q3 ]! f
their uses and limitations becomes an important part related to reliable operation and protection of
: H# V; T" {1 r" `8 Pthe motor and the personnel using the motor. 2 ] f- m) G9 v- \# i9 v$ j5 c
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Motor Control Topics * m$ ]$ I1 E6 @7 _! L! ^
9 ^. i; N: \6 \' o% ]& e4 ?9 VThere are four major motor control topics or categories to consider. Each of these has several
" O/ x9 \3 f* Q. P7 A Y# e! l1 isubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor $ P# g" j, d% y6 e. {
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: - H& X$ g7 }1 v& F; Y: ^' D
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1) Starting the Motor 1 h, E. G, Q6 z9 p
% [) ~# S4 _ s* S) Q* {" W- NDisconnecting Means * P3 H+ q1 P1 S* q6 Q. T
Across the Line Starting ; a, ~7 L. W. c5 c9 a1 ]4 I" ~! d& F
Reduced Voltage Starting 8 O6 O$ E/ O: F9 p7 D) l
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2) Motor Protection
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Overcurrent Protection
- {% g7 E0 ]$ R. K, z8 e+ ~4 ROverload Protection
- |' r+ |* `0 X0 p Y( BOther Protection (voltage, phase, etc) 1 J( z! w( a3 m6 w: R+ J
Environment
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3) Stopping the Motor
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8 f# d8 q- h# eCoasting 6 ?& D- G; X" G8 {# |6 a' `
Electrical Braking
8 N- b6 [7 a4 ?$ `' c- ^Mechanical Braking ; Y8 E0 b! s. J! B7 D
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# _5 W8 h; T8 }4) Motor Operational Control 2 e& i/ m: H5 g% X$ u6 F; z% G0 Y
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Speed Control ' F+ @1 l6 l! q1 f: s
Reversing : Z7 \+ S; A$ u2 u
Jogging " f8 C/ P2 s# C' G6 W
Sequence Control |
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发表于 2009-6-19 21:51
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