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ELECTRIC MOTOR CONTROLS 2 ~* h; v/ D, a* A1 v/ g- [/ \$ U- c% b
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Once the proper motor is selected, understanding the many various control devices available and ! V$ b! m. m2 }. j7 V8 q% O3 ]8 z
their uses and limitations becomes an important part related to reliable operation and protection of
! m( Z" G6 }* Q$ o S. }. x6 A, i8 }5 gthe motor and the personnel using the motor. / M) z; w$ L/ V' |
6 G9 S$ s) a! Q) O# L6 z1 vMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
' w. K$ W. D. [, ]& G h! Bsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
" W& L" p- D9 C4 u7 |0 Zcontrol equipment can accomplish multiple functions from each of the topics or categories. ) B* l5 b( j& W/ J. ]
& j. G# F" R7 L/ nThe four categories include:
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1) Starting the Motor & x; `4 W( c, p! o. E5 `2 t @
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Disconnecting Means ; G3 U& F! C4 S, N3 ?8 x. L: o
Across the Line Starting $ d# J; T X+ B( R J
Reduced Voltage Starting % Z9 \ Y6 T+ K
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! P" R( p' }4 A% W* \1 E$ W* T8 N0 s2) Motor Protection
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Overcurrent Protection & e' \! Q) p: F+ o1 q# r0 D
Overload Protection
, r7 A9 s* `7 }. N) G# ]0 j% zOther Protection (voltage, phase, etc)
0 E% D1 ~* _/ @6 D5 v1 e; e: w* wEnvironment ' r6 Q h4 t" K1 M; I: R2 H* G
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3) Stopping the Motor 5 z; \6 L; J1 _/ G! b
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Coasting ! e! ?& [" o7 M
Electrical Braking % K' I# |, ?" F; w
Mechanical Braking ' l+ a+ ]8 n/ Y: h. M# t
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4) Motor Operational Control
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, x6 k6 {8 \# t z( P4 jSpeed Control
& x1 D, X7 O3 }3 S7 YReversing m8 D3 p" T7 U, k6 ~ [: j k4 S
Jogging 6 w# _2 T$ v. o3 [! O0 x% j) b
Sequence Control |
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发表于 2009-6-19 21:51
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