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ELECTRIC MOTOR CONTROLS ; [0 [' T" m* g3 R
- U9 ~! J6 p% b( @7 kOnce the proper motor is selected, understanding the many various control devices available and
`; k% }2 [: y* Ktheir uses and limitations becomes an important part related to reliable operation and protection of + L; w s7 T$ K1 I, P0 a- h* k
the motor and the personnel using the motor. ; Z. E# ]; Y3 ?; v5 {0 a$ E5 W' W
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Motor Control Topics / P/ G: ^( h/ M- f# }4 X, r
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There are four major motor control topics or categories to consider. Each of these has several
# H+ g2 H/ V0 ~) N' S( C, Isubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor & b c. s p( S) d7 ^& |3 w& T S
control equipment can accomplish multiple functions from each of the topics or categories.
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* Z' Z) ^' d/ }8 O' ZThe four categories include:
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( p* W' t/ ?4 j4 Y4 v# A( e5 k1) Starting the Motor
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# v) Q# C3 h/ T8 iDisconnecting Means ) M. t/ j. Q5 z$ l# T. O
Across the Line Starting
1 q x7 d% O- F) Y* N; ^Reduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection
% k. b0 B3 c& v. N" o# `" ]3 XOverload Protection
; q. T, T; D! |( j) `Other Protection (voltage, phase, etc)
' q9 k$ ~& Y- p4 b& U/ j! {Environment 8 Y, m. A1 x* C" H
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1 N9 K: U8 C! |$ @3) Stopping the Motor
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R n. I6 F, c( p2 S9 b. rCoasting ' t" H4 C" G- w6 C
Electrical Braking
' o: X M" X* e( p" _Mechanical Braking 4 h P* l9 J6 }$ l- }; \
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4) Motor Operational Control % I' ^0 B1 }% W7 }
- I( _& e4 k, S. E! p2 KSpeed Control
# D6 C% J5 R* A |: X b& nReversing 7 q# ]; G$ y) U8 L" p
Jogging
% F3 |* j% e, ]- p+ D9 d" `( T, e* ISequence Control |
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发表于 2009-6-19 21:51
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