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ELECTRIC MOTOR CONTROLS , |( Z- i" }" t9 {; r' g2 `. x
* W+ Y N, C1 _/ D( }Once the proper motor is selected, understanding the many various control devices available and ; `" b" s* X( p, T$ h
their uses and limitations becomes an important part related to reliable operation and protection of
/ a1 T, d' g3 Nthe motor and the personnel using the motor.
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3 T7 @4 j& I' d% y5 f: LMotor Control Topics
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3 W1 u4 w( ?% Q8 BThere are four major motor control topics or categories to consider. Each of these has several
1 D: Y% E+ W2 l9 S# e+ J* Ssubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 1 ^. X0 M5 b" l
control equipment can accomplish multiple functions from each of the topics or categories.
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' V5 w* p" t+ `1 r+ c5 B: e+ }The four categories include: 8 |* q- i- r4 M: d8 D
3 o( [; O) Y$ f8 [1) Starting the Motor 4 |$ `8 i" o' ?3 ~) p- ]0 }
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Disconnecting Means . }, f, E) S7 {8 ?; S
Across the Line Starting
a# ]5 B) L2 v8 xReduced Voltage Starting
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8 d# c# L- O3 q+ f$ Z( _2) Motor Protection 7 @; j% z% H& R9 k J% E3 j
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Overcurrent Protection : P" d. i( H' @$ i
Overload Protection
5 j1 S- S; A4 d1 bOther Protection (voltage, phase, etc) ) f) X: ?6 B4 M( t$ h# k
Environment
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) u- G- D" P" R* g# x- y. Z3) Stopping the Motor
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7 w( I. `4 i- ^1 [! [7 f: SCoasting 0 t5 C, u3 Z# \6 U! |* m
Electrical Braking
: y# H' v: T8 HMechanical Braking
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, P, D( o2 q, W+ t' c+ Z4) Motor Operational Control ) }3 }1 K% M: U1 M2 r- N% L3 d
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Speed Control
' ?& u8 t2 U3 R5 J( ^Reversing 0 i" }1 Q2 b* Z/ W# ~$ R. n
Jogging ( ^' {- k& K( o& J0 X3 x7 p! w; A
Sequence Control |
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发表于 2009-6-19 21:51
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