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ELECTRIC MOTOR CONTROLS ! c) }: a* F0 B3 y2 ]4 I
) U6 u' i' e7 NOnce the proper motor is selected, understanding the many various control devices available and 8 g/ @- p0 i1 y+ n$ [5 Y5 F
their uses and limitations becomes an important part related to reliable operation and protection of
3 i. Z/ v0 p) B* t- mthe motor and the personnel using the motor.
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$ k" }) \& Q9 S) JMotor Control Topics # l3 P6 _, ?, Z
3 L6 g* u! _9 f KThere are four major motor control topics or categories to consider. Each of these has several
) Z1 t, L4 y7 _# z2 I1 z. }. `! l+ Esubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ Z4 ^7 }) V& Y) A, p* ucontrol equipment can accomplish multiple functions from each of the topics or categories.
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: l4 I6 }/ Q& N' j. ~The four categories include:
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( f& W+ \7 I+ x( j4 R. A1) Starting the Motor Y5 g) C e% x( `. O S
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Disconnecting Means
% p" [; N' ]; r R4 M2 j8 G- yAcross the Line Starting & z+ L" F/ h2 I# t( }
Reduced Voltage Starting + q I+ r* j% ~1 i
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s& e5 ^7 @! \- I2) Motor Protection - T, h5 [$ G) Z
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Overcurrent Protection # W `1 ^( J0 \) p. s9 k% I
Overload Protection : l5 S+ m2 ^$ j! G7 m3 B# G3 f
Other Protection (voltage, phase, etc)
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7 `. H- B' R* }$ H3) Stopping the Motor & p r, `. F. @" Z/ B
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Coasting ; | H1 Q" |5 G- F2 V
Electrical Braking
: f1 g+ r, \: J$ k8 k& F/ N+ @Mechanical Braking $ S' c; E& K4 c$ C
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: m3 B$ J# u6 n) p7 U4) Motor Operational Control ; p C Y* @* R+ d2 e. y( F9 P& M% n7 C
" t, U1 B; O+ @3 I# J: S- hSpeed Control . }5 M' p/ b2 t) q4 O2 _
Reversing , n& S; Y) J. M
Jogging
; f6 O' A. j( c7 C# \Sequence Control |
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发表于 2009-6-19 21:51
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