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ELECTRIC MOTOR CONTROLS + @3 B/ M: R- Z" s
n# C/ ]" j5 x O; X9 UOnce the proper motor is selected, understanding the many various control devices available and
0 d C' R# C. k. \their uses and limitations becomes an important part related to reliable operation and protection of $ N# a6 M! K% z. y* O6 `3 T/ D
the motor and the personnel using the motor. 6 P* d" a4 i- W; b! l
( R; o1 H6 ~# x3 K( D* @2 nMotor Control Topics
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) W" j( o7 z9 ?& s. d) R$ HThere are four major motor control topics or categories to consider. Each of these has several
0 m j5 J. A/ Y# \subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor , W5 {% j* V" d8 h" }
control equipment can accomplish multiple functions from each of the topics or categories. 2 @' ^4 X& M2 U0 T
7 Z7 @: Y, k9 N+ x, y+ GThe four categories include: 7 m) S4 B% [( \# @
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1) Starting the Motor
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a# f/ o8 q( ~! M, LDisconnecting Means 0 Y4 n" ?5 a* K! \& ]5 j. L
Across the Line Starting $ c' B. X9 }1 m; z
Reduced Voltage Starting
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2) Motor Protection ( m6 X# v' P; h$ f; x7 ?) z
+ F8 ^# P, z$ X. n2 COvercurrent Protection
9 y: ]+ V4 S( j4 cOverload Protection 7 @6 y9 g7 |7 f4 [3 U1 n- S
Other Protection (voltage, phase, etc) 7 |- g) v& I5 S9 f; B; @
Environment 0 S" ]5 Y' W3 L* z" A; ?) p
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: O8 r) C% G: \- `( O: g- P0 [' o; _3) Stopping the Motor 7 z: w# B8 _" I* B1 {
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Coasting 6 n5 U2 F3 G# n4 M, y
Electrical Braking
: N* ~* O+ m$ H5 IMechanical Braking
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8 d: X, {. \9 f3 o) b" x* T6 H4) Motor Operational Control
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& W5 k- N( d* Q- X$ W' }- JSpeed Control $ V |2 ^9 o, J9 Q0 f) @4 D" Z
Reversing
4 j1 Z& U. S- Z2 p! vJogging ; U0 t% [- m7 [7 E6 O6 U
Sequence Control |
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发表于 2009-6-19 21:51
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