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ELECTRIC MOTOR CONTROLS . F& u% W6 a8 h8 {* t. F
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Once the proper motor is selected, understanding the many various control devices available and # [. a2 p3 V' C
their uses and limitations becomes an important part related to reliable operation and protection of
! Q8 t! N8 X0 t9 s3 othe motor and the personnel using the motor. , ]' g# e2 ?9 ?# |1 ~ u8 o4 D
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Motor Control Topics
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; M7 i2 v8 `" A I, M; ], d( T6 gThere are four major motor control topics or categories to consider. Each of these has several
1 Q6 u, J& j5 n7 Z6 c/ O8 Z1 b3 k$ csubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor - S1 R6 h% Z; a2 l! M7 b
control equipment can accomplish multiple functions from each of the topics or categories.
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+ [& p7 H$ X2 C8 `# IThe four categories include:
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. R! K, \6 [6 c' {3 L1) Starting the Motor * L$ D- @, }- {' j" a
# R6 X4 O6 M. |8 z8 r. N o# qDisconnecting Means ( D# q" l/ L3 u# D9 I& _
Across the Line Starting 8 P8 y" N) k1 Z; j O
Reduced Voltage Starting & z0 C- F$ p! |/ a
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& `8 u: [* L6 Y2) Motor Protection 3 U6 n. C4 f* X
' [4 V v- {6 w7 oOvercurrent Protection * B' m; s- H5 l/ O( A
Overload Protection
, P: V, K. g( [. n; L# F% c' hOther Protection (voltage, phase, etc) 2 ?2 {7 Z; \" X; h! D# g* o* `* _. U0 x
Environment
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& ]/ c4 V0 E. _# K5 ]3) Stopping the Motor ! {- ~, G9 e1 N6 U% H, I: e5 d
' y$ X& h+ w: z' d0 }! e1 JCoasting ! U0 n f1 V6 k7 K/ _0 n
Electrical Braking
) B, u/ U# d. MMechanical Braking
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/ a, m; S' ~8 S/ t6 e, N4) Motor Operational Control 3 }; p, |0 C8 }9 L( N }( h
' X# W) [ A6 l8 xSpeed Control
$ L% [% ]% C% n8 H; |: m/ }, }Reversing
9 z# F: H3 i5 {) y4 o. X& K8 bJogging
/ y9 t8 j; B1 ?5 I8 `Sequence Control |
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发表于 2009-6-19 21:51
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