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ELECTRIC MOTOR CONTROLS + n2 g( A6 z+ b: H' w
" X+ p) F7 m9 V* D$ u4 k3 |. h" w0 gOnce the proper motor is selected, understanding the many various control devices available and
% F# [8 t5 X6 m+ `their uses and limitations becomes an important part related to reliable operation and protection of
: _; Y% O" S- e, hthe motor and the personnel using the motor. : m, ?* A5 u6 U
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Motor Control Topics 8 j U2 O$ g8 i6 v: N
% {- e) Z. n0 v" }& @% OThere are four major motor control topics or categories to consider. Each of these has several
. _5 D) r/ ^2 z0 Qsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ; q: t# R+ G; U- J J c
control equipment can accomplish multiple functions from each of the topics or categories.
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' m3 u3 [* n2 XThe four categories include:
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1) Starting the Motor
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! i- w z) L3 b) G+ y% I& J0 P5 A1 w3 BDisconnecting Means + G/ \3 d0 b4 [$ \, K' i
Across the Line Starting
+ c7 [$ C& B$ p4 zReduced Voltage Starting d! ?7 Q1 a& @7 |8 C, P% k
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2) Motor Protection * B0 t1 r# F9 i
0 ]& R- Y8 |& |1 V( iOvercurrent Protection
7 P) b5 ~1 Y: DOverload Protection ! N- c8 i; V6 {/ g7 Y' @
Other Protection (voltage, phase, etc)
2 E( u) f: g$ m2 ~: e% jEnvironment
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8 n, x1 }2 c. z3) Stopping the Motor 9 ~2 }( Z2 j" g- u+ W) Y
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Coasting
& I. L0 W; S& O( \Electrical Braking
, U. _( D; C! L* D0 A, b7 e `9 QMechanical Braking 8 t0 \7 x3 M" q. O6 y
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4) Motor Operational Control
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$ s" [: `- C ~5 w1 x9 }Speed Control I' O8 Q! m+ N7 C' E5 A
Reversing 4 ^5 p- `/ S0 }6 i9 e% \( T
Jogging
8 u. W+ s! g6 V. |3 P0 E6 GSequence Control |
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发表于 2009-6-19 21:51
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