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ELECTRIC MOTOR CONTROLS
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- U! o& o J+ T2 M. A' [Once the proper motor is selected, understanding the many various control devices available and
# c! J) [- V# K3 q u o0 j6 ttheir uses and limitations becomes an important part related to reliable operation and protection of D. r. D) Q) u
the motor and the personnel using the motor.
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. W1 y& p1 R7 gMotor Control Topics 1 E" j# n3 s3 Y$ v' d q+ J0 c9 D
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There are four major motor control topics or categories to consider. Each of these has several
: ~8 {9 ~( K# P1 `: ?0 @subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
$ Y/ z$ h& o& w' qcontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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1) Starting the Motor
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# R( ] _% l, O, ]/ ?8 t+ y$ ~Disconnecting Means . w C& u. X( H, t8 P# b
Across the Line Starting 9 h8 ]9 h- m8 T4 H& Z" ?
Reduced Voltage Starting 7 ?* Y& E# L. \8 y" w, [
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/ Z. F, a6 d( Z4 c: Y$ W2) Motor Protection
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Overcurrent Protection
" g: T& y' X( ?/ }: F3 K/ TOverload Protection ! c& e. z; t7 D/ U
Other Protection (voltage, phase, etc) ' L* ?- ]2 C/ [
Environment 3 S, F/ n; q6 R; p" ^6 G3 N. h% E
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1 y- t, i' A! K) X, M1 R3) Stopping the Motor 6 q4 ?& b+ ]* K5 g3 ^2 s
' z* W) _ C- ]6 c3 G9 @9 fCoasting
9 w& _9 E' M1 h" P( q0 KElectrical Braking % f1 W) H5 Q! Y
Mechanical Braking 0 w% V2 Z4 y% H5 G8 Z g- @/ f
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4) Motor Operational Control
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: d. P* _1 z0 g" aSpeed Control
" [, u. a& T* B$ s8 m8 CReversing
0 v- W8 @+ y/ G, ^: L1 e! j" o/ o+ u2 oJogging
4 r* |7 K$ L, \$ Q( | ~2 D$ b/ @ h: `$ [Sequence Control |
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发表于 2009-6-19 21:51
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