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ELECTRIC MOTOR CONTROLS 3 N; H/ H% z C
& \* A' z8 T1 F: W9 f+ NOnce the proper motor is selected, understanding the many various control devices available and
& E) D' o$ H/ T$ }4 ^4 E. H( ltheir uses and limitations becomes an important part related to reliable operation and protection of
# h& H6 S7 c' s) v" {: kthe motor and the personnel using the motor. 0 j% @- b+ ?- m0 o/ K
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several r) y0 A" v2 y& _! b f3 D
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
' `) _7 i8 j4 Wcontrol equipment can accomplish multiple functions from each of the topics or categories. % v2 X3 Q9 }) v; }# h0 A
' y! q2 F, v: w0 w& MThe four categories include: ) e& m! ]% s6 r$ p7 @! Y8 U, ]" d
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1) Starting the Motor
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Disconnecting Means ( }* B$ k$ c* {! I) H/ Y% s* h/ r
Across the Line Starting 8 |: {9 q. r f
Reduced Voltage Starting ! U- B' c6 D* v% j7 P# Z
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( a) w: \0 T7 x6 I l- g6 p* m) \: e2) Motor Protection
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Overcurrent Protection
: ?* A) e" R: Y$ N& t! C$ \* A9 T+ OOverload Protection 4 l8 x" m* {' ?
Other Protection (voltage, phase, etc)
- J) @' P% k0 F$ FEnvironment 3 z7 g; z U5 L9 c
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$ R; Q) S2 o+ j! U3 c( E3) Stopping the Motor
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Coasting $ a, A1 I9 h$ c; Q' ~% d& J
Electrical Braking
; V7 S) o6 ~. }( c' k4 EMechanical Braking
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0 d$ Y W9 `) H. V* z! Q$ n- L u+ G4) Motor Operational Control % z# o6 n4 E. H' U; ~4 W/ h
+ s2 f8 f' F4 l3 R# I; x8 ySpeed Control
; N9 } G/ @% zReversing 6 }4 D& y" {4 P1 x% i: O' a
Jogging 1 |9 v* o% e- j! k) n
Sequence Control |
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发表于 2009-6-19 21:51
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