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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
+ X9 W. _8 u: e+ D6 ntheir uses and limitations becomes an important part related to reliable operation and protection of
9 q3 l" [: S1 T+ g5 a8 p9 v9 Pthe motor and the personnel using the motor. $ c* D/ m9 H: L0 r1 j) a5 }
7 r q( s* d/ g5 A3 G K# |: ^Motor Control Topics . P% [# K* H$ S9 M
- M) A! ]# r8 v+ _" {) [There are four major motor control topics or categories to consider. Each of these has several
1 L& ?0 F+ Z# H% q6 U8 f: Esubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor . D! n, f1 f7 S$ k- f% E8 ^; y3 X& a
control equipment can accomplish multiple functions from each of the topics or categories. , ^; s7 M. y. @& s) l- s$ h
3 y6 Z7 I, H$ M" Y- R# }The four categories include: 6 G" \+ l% }' e; Z
- N& B- q' x1 V1) Starting the Motor
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8 o" Q2 K; q. X4 _. v3 WDisconnecting Means
2 y* K( f w) q2 n7 UAcross the Line Starting * Y4 Y! p% O0 Y. B
Reduced Voltage Starting 3 d. @- o, N$ r; v* H# h+ P0 l
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1 Z3 l- N) b. y% ^/ F2) Motor Protection
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Overcurrent Protection ) h4 e4 ~ K6 i; F$ e9 T
Overload Protection
; Q0 V! d1 Z0 U3 `; r; e7 v3 e; v) HOther Protection (voltage, phase, etc) 9 f& Z- C9 [2 w. k0 ^( g _
Environment 2 y- a3 o! I5 \% J
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3) Stopping the Motor
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9 n& _( x1 \- x! o/ I0 nCoasting 2 k% {, T' s: R% X! r
Electrical Braking ! \8 x t/ G8 ~$ y, b
Mechanical Braking B1 I2 R+ l% z+ G9 ~
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5 ?5 S, K4 P1 p0 ?4) Motor Operational Control
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Speed Control
8 _: O4 m$ b. k& @Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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