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ELECTRIC MOTOR CONTROLS 1 d8 _& i) a; T$ T9 _1 M2 f9 p
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Once the proper motor is selected, understanding the many various control devices available and 4 W2 f0 M. o7 a$ S
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics
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% A8 v$ m! a, t1 D1 o& |There are four major motor control topics or categories to consider. Each of these has several
( V! y" K K; t7 f6 \% Tsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
$ \5 d# c4 w. f7 a1 T4 z, ocontrol equipment can accomplish multiple functions from each of the topics or categories. , p+ [5 j1 Q' ` c
" n9 ^/ D! h6 EThe four categories include:
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7 ], V+ I! T9 j( K4 z3 S. q [1) Starting the Motor ) ?- r9 X; M7 a- f6 i1 u
6 b# v! N8 d! x( D8 d# }0 `2 i0 MDisconnecting Means 1 t3 T% h9 K$ j" G) V
Across the Line Starting ! g! i2 A3 J( V! n$ L
Reduced Voltage Starting
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8 X$ s4 J9 c7 c3 V7 Z7 I/ E2) Motor Protection ) S5 ]) J9 F1 ^
& o$ q: _: d' a) lOvercurrent Protection
7 g( R( \$ }$ ROverload Protection , }( R- r! a. q I
Other Protection (voltage, phase, etc) 1 |( C( @2 @% e# i- j) y: W6 x- N
Environment & m5 n' @" k, b8 V. a
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" ]# J: {' Q0 u1 m$ W' d+ F3) Stopping the Motor ' c1 R8 {+ y4 D& t' t2 T
% B( w; w: J* ?/ F3 {6 p0 \4 B* GCoasting 5 U, H; G _) k% N6 X
Electrical Braking & o! M$ e% }$ B: M. y
Mechanical Braking . g2 u: o1 N7 n, [7 `, Z7 D
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6 |1 [" A9 M" h. m9 g4) Motor Operational Control ( f5 m. M" T, U G; q2 B; @
6 I, r6 u1 n7 o, i' J2 ySpeed Control / N% G# G( {$ k, c' I
Reversing ; Z) u! q! }. `1 H. w8 D3 u4 N+ b
Jogging 8 d* H8 }+ a0 T7 [7 B+ L, I( x- S
Sequence Control |
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发表于 2009-6-19 21:51
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